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247 changed files with 12547 additions and 29559 deletions

8
.gitattributes vendored
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[attr]rust text eol=lf whitespace=tab-in-indent,trailing-space,tabwidth=4
* text=auto eol=lf
*.rs rust
*.woff binary
*.ttf binary
*.otf binary
*.png binary

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@ -1,45 +0,0 @@
name: Bug Report
description: Create a report to help us improve
labels: ["C-bug"]
body:
- type: markdown
attributes:
value: Thanks for filing a 🐛 bug report 😄!
- type: textarea
id: problem
attributes:
label: Problem
description: >
Please provide a clear and concise description of what the bug is,
including what currently happens and what you expected to happen.
validations:
required: true
- type: textarea
id: steps
attributes:
label: Steps
description: Please list the steps to reproduce the bug.
placeholder: |
1.
2.
3.
- type: textarea
id: possible-solutions
attributes:
label: Possible Solution(s)
description: >
Not obligatory, but suggest a fix/reason for the bug,
or ideas how to implement the addition or change.
- type: textarea
id: notes
attributes:
label: Notes
description: Provide any additional notes that might be helpful.
- type: textarea
id: version
attributes:
label: Version
description: >
Please paste the output of running `mdbook --version` or which version
of the library you are using.
render: text

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@ -1,28 +0,0 @@
name: Enhancement
description: Suggest an idea for enhancing mdBook
labels: ["C-enhancement"]
body:
- type: markdown
attributes:
value: |
Thanks for filing a 🙋 feature request 😄!
- type: textarea
id: problem
attributes:
label: Problem
description: >
Please provide a clear description of your use case and the problem
this feature request is trying to solve.
validations:
required: true
- type: textarea
id: solution
attributes:
label: Proposed Solution
description: >
Please provide a clear and concise description of what you want to happen.
- type: textarea
id: notes
attributes:
label: Notes
description: Provide any additional context or information that might be helpful.

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@ -1,24 +0,0 @@
name: Question
description: Have a question on how to use mdBook?
labels: ["C-question"]
body:
- type: markdown
attributes:
value: |
Got a question on how to do something with mdBook?
- type: textarea
id: question
attributes:
label: Question
description: >
Enter your question here. Please try to provide as much detail as possible.
validations:
required: true
- type: textarea
id: version
attributes:
label: Version
description: >
Please paste the output of running `mdbook --version` or which version
of the library you are using.
render: text

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@ -1,73 +0,0 @@
name: Deploy
on:
release:
types: [created]
defaults:
run:
shell: bash
permissions:
contents: write
jobs:
release:
name: Deploy Release
runs-on: ${{ matrix.os }}
strategy:
matrix:
target:
- aarch64-unknown-linux-musl
- x86_64-unknown-linux-gnu
- x86_64-unknown-linux-musl
- x86_64-apple-darwin
- x86_64-pc-windows-msvc
include:
- target: aarch64-unknown-linux-musl
os: ubuntu-20.04
- target: x86_64-unknown-linux-gnu
os: ubuntu-20.04
- target: x86_64-unknown-linux-musl
os: ubuntu-20.04
- target: x86_64-apple-darwin
os: macos-latest
- target: x86_64-pc-windows-msvc
os: windows-latest
steps:
- uses: actions/checkout@master
- name: Install Rust
run: ci/install-rust.sh stable ${{ matrix.target }}
- name: Build asset
run: ci/make-release-asset.sh ${{ matrix.os }} ${{ matrix.target }}
- name: Update release with new asset
env:
GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
run: gh release upload $MDBOOK_TAG $MDBOOK_ASSET
pages:
name: GitHub Pages
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@master
- name: Install Rust (rustup)
run: rustup update stable --no-self-update && rustup default stable
- name: Build book
run: cargo run -- build guide
- name: Deploy to GitHub
env:
GITHUB_DEPLOY_KEY: ${{ secrets.GITHUB_DEPLOY_KEY }}
run: |
touch guide/book/.nojekyll
curl -LsSf https://raw.githubusercontent.com/rust-lang/simpleinfra/master/setup-deploy-keys/src/deploy.rs | rustc - -o /tmp/deploy
cd guide/book
/tmp/deploy
publish:
name: Publish to crates.io
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@master
- name: Install Rust (rustup)
run: rustup update stable --no-self-update && rustup default stable
- name: Publish
env:
CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}
run: cargo publish --no-verify

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@ -1,66 +0,0 @@
name: CI
on:
pull_request:
merge_group:
jobs:
test:
name: Test
runs-on: ${{ matrix.os }}
strategy:
matrix:
build: [stable, beta, nightly, macos, windows, msrv]
include:
- build: stable
os: ubuntu-latest
rust: stable
- build: beta
os: ubuntu-latest
rust: beta
- build: nightly
os: ubuntu-latest
rust: nightly
- build: macos
os: macos-latest
rust: stable
- build: windows
os: windows-latest
rust: stable
- build: msrv
os: ubuntu-20.04
# sync MSRV with docs: guide/src/guide/installation.md and Cargo.toml
rust: 1.71.0
steps:
- uses: actions/checkout@v3
- name: Install Rust
run: bash ci/install-rust.sh ${{ matrix.rust }}
- name: Build and run tests
run: cargo test --locked
- name: Test no default
run: cargo test --no-default-features
rustfmt:
name: Rustfmt
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v3
- name: Install Rust
run: rustup update stable && rustup default stable && rustup component add rustfmt
- run: cargo fmt --check
# The success job is here to consolidate the total success/failure state of
# all other jobs. This job is then included in the GitHub branch protection
# rule which prevents merges unless all other jobs are passing. This makes
# it easier to manage the list of jobs via this yml file and to prevent
# accidentally adding new jobs without also updating the branch protections.
success:
name: Success gate
if: always()
needs:
- test
- rustfmt
runs-on: ubuntu-latest
steps:
- run: jq --exit-status 'all(.result == "success")' <<< '${{ toJson(needs) }}'
- name: Done
run: exit 0

18
.gitignore vendored
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@ -1,18 +0,0 @@
target
# MacOS temp file
.DS_Store
book-test
guide/book
.vscode
tests/dummy_book/book/
test_book/book/
# Ignore Jetbrains specific files.
.idea/
# Ignore Vim temporary and swap files.
*.sw?
*~

1
.nojekyll Normal file
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@ -0,0 +1 @@
This file makes sure that Github Pages doesn't process mdBook's output.

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@ -1,64 +1,45 @@
<!DOCTYPE HTML> <!DOCTYPE HTML>
<html lang="{{ language }}" class="{{ default_theme }}" dir="{{ text_direction }}"> <html lang="en" class="light" dir="ltr">
<head> <head>
<!-- Book generated using mdBook --> <!-- Book generated using mdBook -->
<meta charset="UTF-8"> <meta charset="UTF-8">
<title>{{ title }}</title> <title>Page not found - mdBook Documentation</title>
{{#if is_print }} <base href="/mdBook/">
<meta name="robots" content="noindex">
{{/if}}
{{#if base_url}}
<base href="{{ base_url }}">
{{/if}}
<!-- Custom HTML head --> <!-- Custom HTML head -->
{{> head}}
<meta name="description" content="Create book from markdown files. Like Gitbook but implemented in Rust">
<meta name="description" content="{{ description }}">
<meta name="viewport" content="width=device-width, initial-scale=1"> <meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="theme-color" content="#ffffff"> <meta name="theme-color" content="#ffffff">
{{#if favicon_svg}} <link rel="icon" href="favicon.svg">
<link rel="icon" href="{{ path_to_root }}favicon.svg"> <link rel="shortcut icon" href="favicon.png">
{{/if}} <link rel="stylesheet" href="css/variables.css">
{{#if favicon_png}} <link rel="stylesheet" href="css/general.css">
<link rel="shortcut icon" href="{{ path_to_root }}favicon.png"> <link rel="stylesheet" href="css/chrome.css">
{{/if}} <link rel="stylesheet" href="css/print.css" media="print">
<link rel="stylesheet" href="{{ path_to_root }}css/variables.css">
<link rel="stylesheet" href="{{ path_to_root }}css/general.css">
<link rel="stylesheet" href="{{ path_to_root }}css/chrome.css">
{{#if print_enable}}
<link rel="stylesheet" href="{{ path_to_root }}css/print.css" media="print">
{{/if}}
<!-- Fonts --> <!-- Fonts -->
<link rel="stylesheet" href="{{ path_to_root }}FontAwesome/css/font-awesome.css"> <link rel="stylesheet" href="FontAwesome/css/font-awesome.css">
{{#if copy_fonts}} <link rel="stylesheet" href="fonts/fonts.css">
<link rel="stylesheet" href="{{ path_to_root }}fonts/fonts.css">
{{/if}}
<!-- Highlight.js Stylesheets --> <!-- Highlight.js Stylesheets -->
<link rel="stylesheet" href="{{ path_to_root }}highlight.css"> <link rel="stylesheet" href="highlight.css">
<link rel="stylesheet" href="{{ path_to_root }}tomorrow-night.css"> <link rel="stylesheet" href="tomorrow-night.css">
<link rel="stylesheet" href="{{ path_to_root }}ayu-highlight.css"> <link rel="stylesheet" href="ayu-highlight.css">
<!-- Custom theme stylesheets --> <!-- Custom theme stylesheets -->
{{#each additional_css}}
<link rel="stylesheet" href="{{ ../path_to_root }}{{ this }}">
{{/each}}
{{#if mathjax_support}}
<!-- MathJax --> <!-- MathJax -->
<script async src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script> <script async src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
{{/if}}
</head> </head>
<body class="sidebar-visible no-js"> <body class="sidebar-visible no-js">
<div id="body-container"> <div id="body-container">
<!-- Provide site root to javascript --> <!-- Provide site root to javascript -->
<script> <script>
var path_to_root = "{{ path_to_root }}"; var path_to_root = "";
var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "{{ preferred_dark_theme }}" : "{{ default_theme }}"; var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "navy" : "light";
</script> </script>
<!-- Work around some values being stored in localStorage wrapped in quotes --> <!-- Work around some values being stored in localStorage wrapped in quotes -->
@ -83,7 +64,7 @@
try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { } try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
if (theme === null || theme === undefined) { theme = default_theme; } if (theme === null || theme === undefined) { theme = default_theme; }
var html = document.querySelector('html'); var html = document.querySelector('html');
html.classList.remove('{{ default_theme }}') html.classList.remove('light')
html.classList.add(theme); html.classList.add(theme);
var body = document.querySelector('body'); var body = document.querySelector('body');
body.classList.remove('no-js') body.classList.remove('no-js')
@ -110,7 +91,7 @@
<nav id="sidebar" class="sidebar" aria-label="Table of contents"> <nav id="sidebar" class="sidebar" aria-label="Table of contents">
<div class="sidebar-scrollbox"> <div class="sidebar-scrollbox">
{{#toc}}{{/toc}} <ol class="chapter"><li class="chapter-item expanded affix "><a href="index.html">Introduction</a></li><li class="chapter-item expanded affix "><li class="part-title">User Guide</li><li class="chapter-item expanded "><a href="guide/installation.html"><strong aria-hidden="true">1.</strong> Installation</a></li><li class="chapter-item expanded "><a href="guide/reading.html"><strong aria-hidden="true">2.</strong> Reading Books</a></li><li class="chapter-item expanded "><a href="guide/creating.html"><strong aria-hidden="true">3.</strong> Creating a Book</a></li><li class="chapter-item expanded affix "><li class="part-title">Reference Guide</li><li class="chapter-item expanded "><a href="cli/index.html"><strong aria-hidden="true">4.</strong> Command Line Tool</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="cli/init.html"><strong aria-hidden="true">4.1.</strong> init</a></li><li class="chapter-item expanded "><a href="cli/build.html"><strong aria-hidden="true">4.2.</strong> build</a></li><li class="chapter-item expanded "><a href="cli/watch.html"><strong aria-hidden="true">4.3.</strong> watch</a></li><li class="chapter-item expanded "><a href="cli/serve.html"><strong aria-hidden="true">4.4.</strong> serve</a></li><li class="chapter-item expanded "><a href="cli/test.html"><strong aria-hidden="true">4.5.</strong> test</a></li><li class="chapter-item expanded "><a href="cli/clean.html"><strong aria-hidden="true">4.6.</strong> clean</a></li><li class="chapter-item expanded "><a href="cli/completions.html"><strong aria-hidden="true">4.7.</strong> completions</a></li></ol></li><li class="chapter-item expanded "><a href="format/index.html"><strong aria-hidden="true">5.</strong> Format</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="format/summary.html"><strong aria-hidden="true">5.1.</strong> SUMMARY.md</a></li><li><ol class="section"><li class="chapter-item expanded "><div><strong aria-hidden="true">5.1.1.</strong> Draft chapter</div></li></ol></li><li class="chapter-item expanded "><a href="format/configuration/index.html"><strong aria-hidden="true">5.2.</strong> Configuration</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="format/configuration/general.html"><strong aria-hidden="true">5.2.1.</strong> General</a></li><li class="chapter-item expanded "><a href="format/configuration/preprocessors.html"><strong aria-hidden="true">5.2.2.</strong> Preprocessors</a></li><li class="chapter-item expanded "><a href="format/configuration/renderers.html"><strong aria-hidden="true">5.2.3.</strong> Renderers</a></li><li class="chapter-item expanded "><a href="format/configuration/environment-variables.html"><strong aria-hidden="true">5.2.4.</strong> Environment Variables</a></li></ol></li><li class="chapter-item expanded "><a href="format/theme/index.html"><strong aria-hidden="true">5.3.</strong> Theme</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="format/theme/index-hbs.html"><strong aria-hidden="true">5.3.1.</strong> index.hbs</a></li><li class="chapter-item expanded "><a href="format/theme/syntax-highlighting.html"><strong aria-hidden="true">5.3.2.</strong> Syntax highlighting</a></li><li class="chapter-item expanded "><a href="format/theme/editor.html"><strong aria-hidden="true">5.3.3.</strong> Editor</a></li></ol></li><li class="chapter-item expanded "><a href="format/mathjax.html"><strong aria-hidden="true">5.4.</strong> MathJax Support</a></li><li class="chapter-item expanded "><a href="format/mdbook.html"><strong aria-hidden="true">5.5.</strong> mdBook-specific features</a></li><li class="chapter-item expanded "><a href="format/markdown.html"><strong aria-hidden="true">5.6.</strong> Markdown</a></li></ol></li><li class="chapter-item expanded "><a href="continuous-integration.html"><strong aria-hidden="true">6.</strong> Continuous Integration</a></li><li class="chapter-item expanded "><a href="for_developers/index.html"><strong aria-hidden="true">7.</strong> For Developers</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="for_developers/preprocessors.html"><strong aria-hidden="true">7.1.</strong> Preprocessors</a></li><li class="chapter-item expanded "><a href="for_developers/backends.html"><strong aria-hidden="true">7.2.</strong> Alternative Backends</a></li><li class="spacer"></li></ol></li><li class="chapter-item expanded "><a href="misc/contributors.html">Contributors</a></li></ol>
</div> </div>
<div id="sidebar-resize-handle" class="sidebar-resize-handle"> <div id="sidebar-resize-handle" class="sidebar-resize-handle">
<div class="sidebar-resize-indicator"></div> <div class="sidebar-resize-indicator"></div>
@ -142,8 +123,7 @@
<div id="page-wrapper" class="page-wrapper"> <div id="page-wrapper" class="page-wrapper">
<div class="page"> <div class="page">
{{> header}} <div id="menu-bar-hover-placeholder"></div>
<div id="menu-bar-hover-placeholder"></div>
<div id="menu-bar" class="menu-bar sticky"> <div id="menu-bar" class="menu-bar sticky">
<div class="left-buttons"> <div class="left-buttons">
<label id="sidebar-toggle" class="icon-button" for="sidebar-toggle-anchor" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar"> <label id="sidebar-toggle" class="icon-button" for="sidebar-toggle-anchor" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar">
@ -159,36 +139,24 @@
<li role="none"><button role="menuitem" class="theme" id="navy">Navy</button></li> <li role="none"><button role="menuitem" class="theme" id="navy">Navy</button></li>
<li role="none"><button role="menuitem" class="theme" id="ayu">Ayu</button></li> <li role="none"><button role="menuitem" class="theme" id="ayu">Ayu</button></li>
</ul> </ul>
{{#if search_enabled}}
<button id="search-toggle" class="icon-button" type="button" title="Search. (Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar"> <button id="search-toggle" class="icon-button" type="button" title="Search. (Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar">
<i class="fa fa-search"></i> <i class="fa fa-search"></i>
</button> </button>
{{/if}}
</div> </div>
<h1 class="menu-title">{{ book_title }}</h1> <h1 class="menu-title">mdBook Documentation</h1>
<div class="right-buttons"> <div class="right-buttons">
{{#if print_enable}} <a href="print.html" title="Print this book" aria-label="Print this book">
<a href="{{ path_to_root }}print.html" title="Print this book" aria-label="Print this book">
<i id="print-button" class="fa fa-print"></i> <i id="print-button" class="fa fa-print"></i>
</a> </a>
{{/if}} <a href="https://github.com/rust-lang/mdBook/tree/master/guide" title="Git repository" aria-label="Git repository">
{{#if git_repository_url}} <i id="git-repository-button" class="fa fa-github"></i>
<a href="{{git_repository_url}}" title="Git repository" aria-label="Git repository">
<i id="git-repository-button" class="fa {{git_repository_icon}}"></i>
</a> </a>
{{/if}}
{{#if git_repository_edit_url}}
<a href="{{git_repository_edit_url}}" title="Suggest an edit" aria-label="Suggest an edit">
<i id="git-edit-button" class="fa fa-edit"></i>
</a>
{{/if}}
</div> </div>
</div> </div>
{{#if search_enabled}}
<div id="search-wrapper" class="hidden"> <div id="search-wrapper" class="hidden">
<form id="searchbar-outer" class="searchbar-outer"> <form id="searchbar-outer" class="searchbar-outer">
<input type="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header"> <input type="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header">
@ -199,7 +167,6 @@
</ul> </ul>
</div> </div>
</div> </div>
{{/if}}
<!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM --> <!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM -->
<script> <script>
@ -212,22 +179,14 @@
<div id="content" class="content"> <div id="content" class="content">
<main> <main>
{{{ content }}} <h1 id="document-not-found-404"><a class="header" href="#document-not-found-404">Document not found (404)</a></h1>
<p>This URL is invalid, sorry. Try the search instead!</p>
</main> </main>
<nav class="nav-wrapper" aria-label="Page navigation"> <nav class="nav-wrapper" aria-label="Page navigation">
<!-- Mobile navigation buttons --> <!-- Mobile navigation buttons -->
{{#previous}}
<a rel="prev" href="{{ path_to_root }}{{link}}" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
<i class="fa fa-angle-left"></i>
</a>
{{/previous}}
{{#next}}
<a rel="next prefetch" href="{{ path_to_root }}{{link}}" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
<i class="fa fa-angle-right"></i>
</a>
{{/next}}
<div style="clear: both"></div> <div style="clear: both"></div>
</nav> </nav>
@ -235,111 +194,37 @@
</div> </div>
<nav class="nav-wide-wrapper" aria-label="Page navigation"> <nav class="nav-wide-wrapper" aria-label="Page navigation">
{{#previous}}
<a rel="prev" href="{{ path_to_root }}{{link}}" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
<i class="fa fa-angle-left"></i>
</a>
{{/previous}}
{{#next}}
<a rel="next prefetch" href="{{ path_to_root }}{{link}}" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
<i class="fa fa-angle-right"></i>
</a>
{{/next}}
</nav> </nav>
</div> </div>
{{#if live_reload_endpoint}}
<!-- Livereload script (if served using the cli tool) -->
<script>
const wsProtocol = location.protocol === 'https:' ? 'wss:' : 'ws:';
const wsAddress = wsProtocol + "//" + location.host + "/" + "{{{live_reload_endpoint}}}";
const socket = new WebSocket(wsAddress);
socket.onmessage = function (event) {
if (event.data === "reload") {
socket.close();
location.reload();
}
};
window.onbeforeunload = function() {
socket.close();
}
</script>
{{/if}}
{{#if google_analytics}}
<!-- Google Analytics Tag -->
<script>
var localAddrs = ["localhost", "127.0.0.1", ""];
// make sure we don't activate google analytics if the developer is
// inspecting the book locally...
if (localAddrs.indexOf(document.location.hostname) === -1) {
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
ga('create', '{{google_analytics}}', 'auto');
ga('send', 'pageview');
}
</script>
{{/if}}
{{#if playground_line_numbers}}
<script> <script>
window.playground_line_numbers = true; window.playground_line_numbers = true;
</script> </script>
{{/if}}
{{#if playground_copyable}}
<script> <script>
window.playground_copyable = true; window.playground_copyable = true;
</script> </script>
{{/if}}
{{#if playground_js}} <script src="ace.js"></script>
<script src="{{ path_to_root }}ace.js"></script> <script src="editor.js"></script>
<script src="{{ path_to_root }}editor.js"></script> <script src="mode-rust.js"></script>
<script src="{{ path_to_root }}mode-rust.js"></script> <script src="theme-dawn.js"></script>
<script src="{{ path_to_root }}theme-dawn.js"></script> <script src="theme-tomorrow_night.js"></script>
<script src="{{ path_to_root }}theme-tomorrow_night.js"></script>
{{/if}}
{{#if search_js}} <script src="elasticlunr.min.js"></script>
<script src="{{ path_to_root }}elasticlunr.min.js"></script> <script src="mark.min.js"></script>
<script src="{{ path_to_root }}mark.min.js"></script> <script src="searcher.js"></script>
<script src="{{ path_to_root }}searcher.js"></script>
{{/if}}
<script src="{{ path_to_root }}clipboard.min.js"></script> <script src="clipboard.min.js"></script>
<script src="{{ path_to_root }}highlight.js"></script> <script src="highlight.js"></script>
<script src="{{ path_to_root }}book.js"></script> <script src="book.js"></script>
<!-- Custom JS scripts --> <!-- Custom JS scripts -->
{{#each additional_js}}
<script src="{{ ../path_to_root }}{{this}}"></script>
{{/each}}
{{#if is_print}}
{{#if mathjax_support}}
<script>
window.addEventListener('load', function() {
MathJax.Hub.Register.StartupHook('End', function() {
window.setTimeout(window.print, 100);
});
});
</script>
{{else}}
<script>
window.addEventListener('load', function() {
window.setTimeout(window.print, 100);
});
</script>
{{/if}}
{{/if}}
</div> </div>
</body> </body>

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# The Rust Code of Conduct
The Code of Conduct for this repository [can be found online](https://www.rust-lang.org/conduct.html).

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# Contributing
Welcome stranger!
If you have come here to learn how to contribute to mdBook, we have some tips for you!
First of all, don't hesitate to ask questions!
Use the [issue tracker](https://github.com/rust-lang/mdBook/issues), no question is too simple.
### Issue assignment
**:warning: Important :warning:**
Before working on pull request, please ping us on the corresponding issue.
The current PR backlog is beyond what we can process at this time.
Only issues that have an [`E-Help-wanted`](https://github.com/rust-lang/mdBook/labels/E-Help-wanted) or [`Feature accepted`](https://github.com/rust-lang/mdBook/labels/Feature%20accepted) label will likely receive reviews.
If there isn't already an open issue for what you want to work on, please open one first to see if it is something we would be available to review.
### Issues to work on
If you are starting out, you might be interested in the
[E-Easy issues](https://github.com/rust-lang/mdBook/issues?q=is%3Aopen+is%3Aissue+label%3AE-Easy).
Those are issues that are considered more straightforward for beginners to Rust or the codebase itself.
These issues can be a good launching pad for more involved issues.
Easy tasks for a first time contribution include documentation improvements, new tests, examples, updating dependencies, etc.
If you come from a web development background, you might be interested in issues related to web technologies tagged
[A-JavaScript](https://github.com/rust-lang/mdBook/issues?q=is%3Aopen+is%3Aissue+label%3AA-JavaScript),
[A-Style](https://github.com/rust-lang/mdBook/issues?q=is%3Aopen+is%3Aissue+label%3AA-Style),
[A-HTML](https://github.com/rust-lang/mdBook/issues?q=is%3Aopen+is%3Aissue+label%3AA-HTML) or
[A-Mobile](https://github.com/rust-lang/mdBook/issues?q=is%3Aopen+is%3Aissue+label%3AA-Mobile).
When you decide you want to work on a specific issue, and it isn't already assigned to someone else, assign the issue to yourself by leaving a comment with the text `@rustbot claim`.
Again, do not hesitate to ask questions. We will gladly mentor anyone that want to tackle an issue.
Issues on the issue tracker are categorized with the following labels:
- **A**-prefixed labels state which area of the project an issue relates to.
- **E**-prefixed labels show an estimate of the experience necessary to fix the issue.
- **M**-prefixed labels are meta-issues regarding the management of the mdBook project itself
- **S**-prefixed labels show the status of the issue
- **C**-prefixed labels show the category of issue
### Building mdBook
mdBook builds on stable Rust, if you want to build mdBook from source, here are the steps to follow:
1. Navigate to the directory of your choice
0. Clone this repository with git.
```
git clone https://github.com/rust-lang/mdBook.git
```
0. Navigate into the newly created `mdBook` directory
0. Run `cargo build`
The resulting binary can be found in `mdBook/target/debug/` under the name `mdbook` or `mdbook.exe`.
### Code Quality
We love code quality and Rust has some excellent tools to assist you with contributions.
#### Formatting Code with rustfmt
Before you make your Pull Request to the project, please run it through the `rustfmt` utility.
This will ensure we have good quality source code that is better for us all to maintain.
[rustfmt](https://github.com/rust-lang/rustfmt) has a lot more information on the project.
The quick guide is
1. Install it (`rustfmt` is usually installed by default via [rustup](https://rustup.rs/)):
```
rustup component add rustfmt
```
1. You can now run `rustfmt` on a single file simply by...
```
rustfmt src/path/to/your/file.rs
```
... or you can format the entire project with
```
cargo fmt
```
When run through `cargo` it will format all bin and lib files in the current package.
For more information, such as running it from your favourite editor, please see the `rustfmt` project. [rustfmt](https://github.com/rust-lang/rustfmt)
#### Finding Issues with Clippy
[Clippy](https://doc.rust-lang.org/clippy/) is a code analyser/linter detecting mistakes, and therefore helps to improve your code.
Like formatting your code with `rustfmt`, running clippy regularly and before your Pull Request will help us maintain awesome code.
1. To install
```
rustup component add clippy
```
2. Running clippy
```
cargo clippy
```
### Change requirements
Please consider the following when making a change:
* Almost all changes that modify the Rust code must be accompanied with a test.
* Almost all features and changes must update the documentation.
mdBook has the [mdBook Guide](https://rust-lang.github.io/mdBook/) whose source is at <https://github.com/rust-lang/mdBook/tree/master/guide>.
* Almost all Rust items should be documented with doc comments.
See the [Rustdoc Book](https://doc.rust-lang.org/rustdoc/) for more information on writing doc comments.
* Breaking the API can only be done in major SemVer releases.
These are done very infrequently, so it is preferred to avoid these when possible.
See [SemVer Compatibility](https://doc.rust-lang.org/cargo/reference/semver.html) for more information on what a SemVer breaking change is.
(Note: At this time, some SemVer breaking changes are inevitable due to the current code structure.
An example is adding new fields to the config structures.
These are intended to be fixed in the next major release.)
* Similarly, the CLI interface is considered to be stable.
Care should be taken to avoid breaking existing workflows.
* Check out the [Rust API Guidelines](https://rust-lang.github.io/api-guidelines/) for guidelines on designing the API.
### Making a pull-request
When you feel comfortable that your changes could be integrated into mdBook, you can create a pull-request on GitHub.
One of the core maintainers will then approve the changes or request some changes before it gets merged.
That's it, happy contributions! :tada: :tada: :tada:
## Browser compatibility and testing
Currently we don't have a strict browser compatibility matrix due to our limited resources.
We generally strive to keep mdBook compatible with a relatively recent browser on all of the most major platforms.
That is, supporting Chrome, Safari, Firefox, Edge on Windows, macOS, Linux, iOS, and Android.
If possible, do your best to avoid breaking older browser releases.
Any change to the HTML or styling is encouraged to manually check on as many browsers and platforms that you can.
Unfortunately at this time we don't have any automated UI or browser testing, so your assistance in testing is appreciated.
## Updating highlight.js
The following are instructions for updating [highlight.js](https://highlightjs.org/).
1. Clone the repository at <https://github.com/highlightjs/highlight.js>
1. Check out a tagged release (like `10.1.1`).
1. Run `npm install`
1. Run `node tools/build.js :common apache armasm coffeescript d handlebars haskell http julia nginx nim nix properties r scala x86asm yaml`
1. Compare the language list that it spits out to the one in [`syntax-highlighting.md`](https://github.com/camelid/mdBook/blob/master/guide/src/format/theme/syntax-highlighting.md). If any are missing, add them to the list and rebuild (and update these docs). If any are added to the common set, add them to `syntax-highlighting.md`.
1. Copy `build/highlight.min.js` to mdbook's directory [`highlight.js`](https://github.com/rust-lang/mdBook/blob/master/src/theme/highlight.js).
1. Be sure to check the highlight.js [CHANGES](https://github.com/highlightjs/highlight.js/blob/main/CHANGES.md) for any breaking changes. Breaking changes that would affect users will need to wait until the next major release.
1. Build mdbook with the new file and build some books with the new version and compare the output with a variety of languages to see if anything changes. The [test_book](https://github.com/rust-lang/mdBook/tree/master/test_book) contains a chapter with many languages to examine.
## Publishing new releases
Instructions for mdBook maintainers to publish a new release:
1. Create a PR to update the version and update the CHANGELOG:
1. Update the version in `Cargo.toml`
2. Run `cargo test` to verify that everything is passing, and to update `Cargo.lock`.
3. Double-check for any SemVer breaking changes.
Try [`cargo-semver-checks`](https://crates.io/crates/cargo-semver-checks), though beware that the current version of mdBook isn't properly adhering to SemVer due to the lack of `#[non_exhaustive]` and other issues. See https://github.com/rust-lang/mdBook/issues/1835.
4. Update `CHANGELOG.md` with any changes that users may be interested in.
5. Update `continuous-integration.md` to update the version number for the installation instructions.
6. Commit the changes, and open a PR.
2. After the PR has been merged, create a release in GitHub. This can either be done in the GitHub web UI, or on the command-line:
```bash
MDBOOK_VERS="`cargo read-manifest | jq -r .version`" ; \
gh release create -R rust-lang/mdbook v$MDBOOK_VERS \
--title v$MDBOOK_VERS \
--notes "See https://github.com/rust-lang/mdBook/blob/master/CHANGELOG.md#mdbook-${MDBOOK_VERS//.} for a complete list of changes."
```

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[package]
name = "mdbook"
version = "0.4.37"
authors = [
"Mathieu David <mathieudavid@mathieudavid.org>",
"Michael-F-Bryan <michaelfbryan@gmail.com>",
"Matt Ickstadt <mattico8@gmail.com>"
]
documentation = "https://rust-lang.github.io/mdBook/index.html"
edition = "2021"
exclude = ["/guide/*"]
keywords = ["book", "gitbook", "rustbook", "markdown"]
license = "MPL-2.0"
readme = "README.md"
repository = "https://github.com/rust-lang/mdBook"
description = "Creates a book from markdown files"
rust-version = "1.71"
[dependencies]
anyhow = "1.0.71"
chrono = { version = "0.4.24", default-features = false, features = ["clock"] }
clap = { version = "4.3.12", features = ["cargo", "wrap_help"] }
clap_complete = "4.3.2"
once_cell = "1.17.1"
env_logger = "0.11.1"
handlebars = "5.0"
log = "0.4.17"
memchr = "2.5.0"
opener = "0.6.1"
pulldown-cmark = { version = "0.10.0", default-features = false, features = ["html"] }
regex = "1.8.1"
serde = { version = "1.0.163", features = ["derive"] }
serde_json = "1.0.96"
shlex = "1.3.0"
tempfile = "3.4.0"
toml = "0.5.11" # Do not update, see https://github.com/rust-lang/mdBook/issues/2037
topological-sort = "0.2.2"
# Watch feature
notify = { version = "6.1.1", optional = true }
notify-debouncer-mini = { version = "0.4.1", optional = true }
ignore = { version = "0.4.20", optional = true }
pathdiff = { version = "0.2.1", optional = true }
# Serve feature
futures-util = { version = "0.3.28", optional = true }
tokio = { version = "1.28.1", features = ["macros", "rt-multi-thread"], optional = true }
warp = { version = "0.3.6", default-features = false, features = ["websocket"], optional = true }
# Search feature
elasticlunr-rs = { version = "3.0.2", optional = true }
ammonia = { version = "3.3.0", optional = true }
[dev-dependencies]
assert_cmd = "2.0.11"
predicates = "3.0.3"
select = "0.6.0"
semver = "1.0.17"
pretty_assertions = "1.3.0"
walkdir = "2.3.3"
[features]
default = ["watch", "serve", "search"]
watch = ["dep:notify", "dep:notify-debouncer-mini", "dep:ignore", "dep:pathdiff"]
serve = ["dep:futures-util", "dep:tokio", "dep:warp"]
search = ["dep:elasticlunr-rs", "dep:ammonia"]
[[bin]]
doc = false
name = "mdbook"
[[example]]
name = "nop-preprocessor"
test = true

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LICENSE
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Mozilla Public License, version 2.0
1. Definitions
1.1. "Contributor"
means each individual or legal entity that creates, contributes to the
creation of, or owns Covered Software.
1.2. "Contributor Version"
means the combination of the Contributions of others (if any) used by a
Contributor and that particular Contributor's Contribution.
1.3. "Contribution"
means Covered Software of a particular Contributor.
1.4. "Covered Software"
means Source Code Form to which the initial Contributor has attached the
notice in Exhibit A, the Executable Form of such Source Code Form, and
Modifications of such Source Code Form, in each case including portions
thereof.
1.5. "Incompatible With Secondary Licenses"
means
a. that the initial Contributor has attached the notice described in
Exhibit B to the Covered Software; or
b. that the Covered Software was made available under the terms of
version 1.1 or earlier of the License, but not also under the terms of
a Secondary License.
1.6. "Executable Form"
means any form of the work other than Source Code Form.
1.7. "Larger Work"
means a work that combines Covered Software with other material, in a
separate file or files, that is not Covered Software.
1.8. "License"
means this document.
1.9. "Licensable"
means having the right to grant, to the maximum extent possible, whether
at the time of the initial grant or subsequently, any and all of the
rights conveyed by this License.
1.10. "Modifications"
means any of the following:
a. any file in Source Code Form that results from an addition to,
deletion from, or modification of the contents of Covered Software; or
b. any new file in Source Code Form that contains any Covered Software.
1.11. "Patent Claims" of a Contributor
means any patent claim(s), including without limitation, method,
process, and apparatus claims, in any patent Licensable by such
Contributor that would be infringed, but for the grant of the License,
by the making, using, selling, offering for sale, having made, import,
or transfer of either its Contributions or its Contributor Version.
1.12. "Secondary License"
means either the GNU General Public License, Version 2.0, the GNU Lesser
General Public License, Version 2.1, the GNU Affero General Public
License, Version 3.0, or any later versions of those licenses.
1.13. "Source Code Form"
means the form of the work preferred for making modifications.
1.14. "You" (or "Your")
means an individual or a legal entity exercising rights under this
License. For legal entities, "You" includes any entity that controls, is
controlled by, or is under common control with You. For purposes of this
definition, "control" means (a) the power, direct or indirect, to cause
the direction or management of such entity, whether by contract or
otherwise, or (b) ownership of more than fifty percent (50%) of the
outstanding shares or beneficial ownership of such entity.
2. License Grants and Conditions
2.1. Grants
Each Contributor hereby grants You a world-wide, royalty-free,
non-exclusive license:
a. under intellectual property rights (other than patent or trademark)
Licensable by such Contributor to use, reproduce, make available,
modify, display, perform, distribute, and otherwise exploit its
Contributions, either on an unmodified basis, with Modifications, or
as part of a Larger Work; and
b. under Patent Claims of such Contributor to make, use, sell, offer for
sale, have made, import, and otherwise transfer either its
Contributions or its Contributor Version.
2.2. Effective Date
The licenses granted in Section 2.1 with respect to any Contribution
become effective for each Contribution on the date the Contributor first
distributes such Contribution.
2.3. Limitations on Grant Scope
The licenses granted in this Section 2 are the only rights granted under
this License. No additional rights or licenses will be implied from the
distribution or licensing of Covered Software under this License.
Notwithstanding Section 2.1(b) above, no patent license is granted by a
Contributor:
a. for any code that a Contributor has removed from Covered Software; or
b. for infringements caused by: (i) Your and any other third party's
modifications of Covered Software, or (ii) the combination of its
Contributions with other software (except as part of its Contributor
Version); or
c. under Patent Claims infringed by Covered Software in the absence of
its Contributions.
This License does not grant any rights in the trademarks, service marks,
or logos of any Contributor (except as may be necessary to comply with
the notice requirements in Section 3.4).
2.4. Subsequent Licenses
No Contributor makes additional grants as a result of Your choice to
distribute the Covered Software under a subsequent version of this
License (see Section 10.2) or under the terms of a Secondary License (if
permitted under the terms of Section 3.3).
2.5. Representation
Each Contributor represents that the Contributor believes its
Contributions are its original creation(s) or it has sufficient rights to
grant the rights to its Contributions conveyed by this License.
2.6. Fair Use
This License is not intended to limit any rights You have under
applicable copyright doctrines of fair use, fair dealing, or other
equivalents.
2.7. Conditions
Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in
Section 2.1.
3. Responsibilities
3.1. Distribution of Source Form
All distribution of Covered Software in Source Code Form, including any
Modifications that You create or to which You contribute, must be under
the terms of this License. You must inform recipients that the Source
Code Form of the Covered Software is governed by the terms of this
License, and how they can obtain a copy of this License. You may not
attempt to alter or restrict the recipients' rights in the Source Code
Form.
3.2. Distribution of Executable Form
If You distribute Covered Software in Executable Form then:
a. such Covered Software must also be made available in Source Code Form,
as described in Section 3.1, and You must inform recipients of the
Executable Form how they can obtain a copy of such Source Code Form by
reasonable means in a timely manner, at a charge no more than the cost
of distribution to the recipient; and
b. You may distribute such Executable Form under the terms of this
License, or sublicense it under different terms, provided that the
license for the Executable Form does not attempt to limit or alter the
recipients' rights in the Source Code Form under this License.
3.3. Distribution of a Larger Work
You may create and distribute a Larger Work under terms of Your choice,
provided that You also comply with the requirements of this License for
the Covered Software. If the Larger Work is a combination of Covered
Software with a work governed by one or more Secondary Licenses, and the
Covered Software is not Incompatible With Secondary Licenses, this
License permits You to additionally distribute such Covered Software
under the terms of such Secondary License(s), so that the recipient of
the Larger Work may, at their option, further distribute the Covered
Software under the terms of either this License or such Secondary
License(s).
3.4. Notices
You may not remove or alter the substance of any license notices
(including copyright notices, patent notices, disclaimers of warranty, or
limitations of liability) contained within the Source Code Form of the
Covered Software, except that You may alter any license notices to the
extent required to remedy known factual inaccuracies.
3.5. Application of Additional Terms
You may choose to offer, and to charge a fee for, warranty, support,
indemnity or liability obligations to one or more recipients of Covered
Software. However, You may do so only on Your own behalf, and not on
behalf of any Contributor. You must make it absolutely clear that any
such warranty, support, indemnity, or liability obligation is offered by
You alone, and You hereby agree to indemnify every Contributor for any
liability incurred by such Contributor as a result of warranty, support,
indemnity or liability terms You offer. You may include additional
disclaimers of warranty and limitations of liability specific to any
jurisdiction.
4. Inability to Comply Due to Statute or Regulation
If it is impossible for You to comply with any of the terms of this License
with respect to some or all of the Covered Software due to statute,
judicial order, or regulation then You must: (a) comply with the terms of
this License to the maximum extent possible; and (b) describe the
limitations and the code they affect. Such description must be placed in a
text file included with all distributions of the Covered Software under
this License. Except to the extent prohibited by statute or regulation,
such description must be sufficiently detailed for a recipient of ordinary
skill to be able to understand it.
5. Termination
5.1. The rights granted under this License will terminate automatically if You
fail to comply with any of its terms. However, if You become compliant,
then the rights granted under this License from a particular Contributor
are reinstated (a) provisionally, unless and until such Contributor
explicitly and finally terminates Your grants, and (b) on an ongoing
basis, if such Contributor fails to notify You of the non-compliance by
some reasonable means prior to 60 days after You have come back into
compliance. Moreover, Your grants from a particular Contributor are
reinstated on an ongoing basis if such Contributor notifies You of the
non-compliance by some reasonable means, this is the first time You have
received notice of non-compliance with this License from such
Contributor, and You become compliant prior to 30 days after Your receipt
of the notice.
5.2. If You initiate litigation against any entity by asserting a patent
infringement claim (excluding declaratory judgment actions,
counter-claims, and cross-claims) alleging that a Contributor Version
directly or indirectly infringes any patent, then the rights granted to
You by any and all Contributors for the Covered Software under Section
2.1 of this License shall terminate.
5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user
license agreements (excluding distributors and resellers) which have been
validly granted by You or Your distributors under this License prior to
termination shall survive termination.
6. Disclaimer of Warranty
Covered Software is provided under this License on an "as is" basis,
without warranty of any kind, either expressed, implied, or statutory,
including, without limitation, warranties that the Covered Software is free
of defects, merchantable, fit for a particular purpose or non-infringing.
The entire risk as to the quality and performance of the Covered Software
is with You. Should any Covered Software prove defective in any respect,
You (not any Contributor) assume the cost of any necessary servicing,
repair, or correction. This disclaimer of warranty constitutes an essential
part of this License. No use of any Covered Software is authorized under
this License except under this disclaimer.
7. Limitation of Liability
Under no circumstances and under no legal theory, whether tort (including
negligence), contract, or otherwise, shall any Contributor, or anyone who
distributes Covered Software as permitted above, be liable to You for any
direct, indirect, special, incidental, or consequential damages of any
character including, without limitation, damages for lost profits, loss of
goodwill, work stoppage, computer failure or malfunction, or any and all
other commercial damages or losses, even if such party shall have been
informed of the possibility of such damages. This limitation of liability
shall not apply to liability for death or personal injury resulting from
such party's negligence to the extent applicable law prohibits such
limitation. Some jurisdictions do not allow the exclusion or limitation of
incidental or consequential damages, so this exclusion and limitation may
not apply to You.
8. Litigation
Any litigation relating to this License may be brought only in the courts
of a jurisdiction where the defendant maintains its principal place of
business and such litigation shall be governed by laws of that
jurisdiction, without reference to its conflict-of-law provisions. Nothing
in this Section shall prevent a party's ability to bring cross-claims or
counter-claims.
9. Miscellaneous
This License represents the complete agreement concerning the subject
matter hereof. If any provision of this License is held to be
unenforceable, such provision shall be reformed only to the extent
necessary to make it enforceable. Any law or regulation which provides that
the language of a contract shall be construed against the drafter shall not
be used to construe this License against a Contributor.
10. Versions of the License
10.1. New Versions
Mozilla Foundation is the license steward. Except as provided in Section
10.3, no one other than the license steward has the right to modify or
publish new versions of this License. Each version will be given a
distinguishing version number.
10.2. Effect of New Versions
You may distribute the Covered Software under the terms of the version
of the License under which You originally received the Covered Software,
or under the terms of any subsequent version published by the license
steward.
10.3. Modified Versions
If you create software not governed by this License, and you want to
create a new license for such software, you may create and use a
modified version of this License if you rename the license and remove
any references to the name of the license steward (except to note that
such modified license differs from this License).
10.4. Distributing Source Code Form that is Incompatible With Secondary
Licenses If You choose to distribute Source Code Form that is
Incompatible With Secondary Licenses under the terms of this version of
the License, the notice described in Exhibit B of this License must be
attached.
Exhibit A - Source Code Form License Notice
This Source Code Form is subject to the
terms of the Mozilla Public License, v.
2.0. If a copy of the MPL was not
distributed with this file, You can
obtain one at
http://mozilla.org/MPL/2.0/.
If it is not possible or desirable to put the notice in a particular file,
then You may include the notice in a location (such as a LICENSE file in a
relevant directory) where a recipient would be likely to look for such a
notice.
You may add additional accurate notices of copyright ownership.
Exhibit B - "Incompatible With Secondary Licenses" Notice
This Source Code Form is "Incompatible
With Secondary Licenses", as defined by
the Mozilla Public License, v. 2.0.

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# mdBook
[![Build Status](https://github.com/rust-lang/mdBook/workflows/CI/badge.svg?event=push)](https://github.com/rust-lang/mdBook/actions?workflow=CI)
[![crates.io](https://img.shields.io/crates/v/mdbook.svg)](https://crates.io/crates/mdbook)
[![LICENSE](https://img.shields.io/github/license/rust-lang/mdBook.svg)](LICENSE)
mdBook is a utility to create modern online books from Markdown files.
Check out the **[User Guide]** for a list of features and installation and usage information.
The User Guide also serves as a demonstration to showcase what a book looks like.
If you are interested in contributing to the development of mdBook, check out the [Contribution Guide].
## License
All the code in this repository is released under the ***Mozilla Public License v2.0***, for more information take a look at the [LICENSE] file.
[User Guide]: https://rust-lang.github.io/mdBook/
[contribution guide]: https://github.com/rust-lang/mdBook/blob/master/CONTRIBUTING.md
[LICENSE]: https://github.com/rust-lang/mdBook/blob/master/LICENSE

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#!/usr/bin/env bash
# Install/update rust.
# The first argument should be the toolchain to install.
set -ex
if [ -z "$1" ]
then
echo "First parameter must be toolchain to install."
exit 1
fi
TOOLCHAIN="$1"
rustup set profile minimal
rustup component remove --toolchain=$TOOLCHAIN rust-docs || echo "already removed"
rustup update --no-self-update $TOOLCHAIN
if [ -n "$2" ]
then
TARGET="$2"
HOST=$(rustc -Vv | grep ^host: | sed -e "s/host: //g")
if [ "$HOST" != "$TARGET" ]
then
rustup component add llvm-tools-preview --toolchain=$TOOLCHAIN
rustup component add rust-std-$TARGET --toolchain=$TOOLCHAIN
fi
fi
rustup default $TOOLCHAIN
rustup -V
rustc -Vv
cargo -V

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#!/usr/bin/env bash
# Builds the release and creates an archive and optionally deploys to GitHub.
set -ex
if [[ -z "$GITHUB_REF" ]]
then
echo "GITHUB_REF must be set"
exit 1
fi
# Strip mdbook-refs/tags/ from the start of the ref.
TAG=${GITHUB_REF#*/tags/}
host=$(rustc -Vv | grep ^host: | sed -e "s/host: //g")
target=$2
if [ "$host" != "$target" ]
then
export "CARGO_TARGET_$(echo $target | tr a-z- A-Z_)_LINKER"=rust-lld
fi
export CARGO_PROFILE_RELEASE_LTO=true
cargo build --locked --bin mdbook --release --target $target
cd target/$target/release
case $1 in
ubuntu*)
asset="mdbook-$TAG-$target.tar.gz"
tar czf ../../$asset mdbook
;;
macos*)
asset="mdbook-$TAG-$target.tar.gz"
# There is a bug with BSD tar on macOS where the first 8MB of the file are
# sometimes all NUL bytes. See https://github.com/actions/cache/issues/403
# and https://github.com/rust-lang/cargo/issues/8603 for some more
# information. An alternative solution here is to install GNU tar, but
# flushing the disk cache seems to work, too.
sudo /usr/sbin/purge
tar czf ../../$asset mdbook
;;
windows*)
asset="mdbook-$TAG-$target.zip"
7z a ../../$asset mdbook.exe
;;
*)
echo "OS should be first parameter, was: $1"
;;
esac
cd ../..
if [[ -z "$GITHUB_ENV" ]]
then
echo "GITHUB_ENV not set, run: gh release upload $TAG target/$asset"
else
echo "MDBOOK_TAG=$TAG" >> $GITHUB_ENV
echo "MDBOOK_ASSET=target/$asset" >> $GITHUB_ENV
fi

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@ -0,0 +1,268 @@
<!DOCTYPE HTML>
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} else {
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}
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<h1 id="the-build-command"><a class="header" href="#the-build-command">The build command</a></h1>
<p>The build command is used to render your book:</p>
<pre><code class="language-bash">mdbook build
</code></pre>
<p>It will try to parse your <code>SUMMARY.md</code> file to understand the structure of your
book and fetch the corresponding files. Note that this will also create files
mentioned in <code>SUMMARY.md</code> which are not yet present.</p>
<p>The rendered output will maintain the same directory structure as the source for
convenience. Large books will therefore remain structured when rendered.</p>
<h4 id="specify-a-directory"><a class="header" href="#specify-a-directory">Specify a directory</a></h4>
<p>The <code>build</code> command can take a directory as an argument to use as the book's
root instead of the current working directory.</p>
<pre><code class="language-bash">mdbook build path/to/book
</code></pre>
<h4 id="--open"><a class="header" href="#--open">--open</a></h4>
<p>When you use the <code>--open</code> (<code>-o</code>) flag, mdbook will open the rendered book in
your default web browser after building it.</p>
<h4 id="--dest-dir"><a class="header" href="#--dest-dir">--dest-dir</a></h4>
<p>The <code>--dest-dir</code> (<code>-d</code>) option allows you to change the output directory for the
book. Relative paths are interpreted relative to the book's root directory. If
not specified it will default to the value of the <code>build.build-dir</code> key in
<code>book.toml</code>, or to <code>./book</code>.</p>
<hr />
<p><em><strong>Note:</strong></em> <em>The build command copies all files (excluding files with <code>.md</code> extension) from the source directory
into the build directory.</em></p>
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<!DOCTYPE HTML>
<html lang="en" class="light" dir="ltr">
<head>
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<meta charset="UTF-8">
<title>clean - mdBook Documentation</title>
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<script>
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var sidebar = localStorage.getItem('mdbook-sidebar');
if (theme.startsWith('"') && theme.endsWith('"')) {
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sidebar = sidebar || 'visible';
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sidebar = 'hidden';
}
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<p><code>path/to/book</code> could be absolute or relative.</p>
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<h1 id="the-completions-command"><a class="header" href="#the-completions-command">The completions command</a></h1>
<p>The completions command is used to generate auto-completions for some common shells.
This means when you type <code>mdbook</code> in your shell, you can then press your shell's auto-complete key (usually the Tab key) and it may display what the valid options are, or finish partial input.</p>
<p>The completions first need to be installed for your shell:</p>
<pre><code class="language-bash"># bash
mdbook completions bash &gt; ~/.local/share/bash-completion/completions/mdbook
# oh-my-zsh
mdbook completions zsh &gt; ~/.oh-my-zsh/completions/_mdbook
autoload -U compinit &amp;&amp; compinit
</code></pre>
<p>The command prints a completion script for the given shell.
Run <code>mdbook completions --help</code> for a list of supported shells.</p>
<p>Where to place the completions depend on which shell you are using and your operating system.
Consult your shell's documentation for more information one where to place the script.</p>
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<h1 id="command-line-tool"><a class="header" href="#command-line-tool">Command Line Tool</a></h1>
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After you have <a href="../guide/installation.html">installed</a> <code>mdbook</code>, you can run the <code>mdbook help</code> command in your terminal to view the available commands.</p>
<p>This following sections provide in-depth information on the different commands available.</p>
<ul>
<li><a href="init.html"><code>mdbook init &lt;directory&gt;</code></a> — Creates a new book with minimal boilerplate to start with.</li>
<li><a href="build.html"><code>mdbook build</code></a> — Renders the book.</li>
<li><a href="watch.html"><code>mdbook watch</code></a> — Rebuilds the book any time a source file changes.</li>
<li><a href="serve.html"><code>mdbook serve</code></a> — Runs a web server to view the book, and rebuilds on changes.</li>
<li><a href="test.html"><code>mdbook test</code></a> — Tests Rust code samples.</li>
<li><a href="clean.html"><code>mdbook clean</code></a> — Deletes the rendered output.</li>
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<ol class="chapter"><li class="chapter-item expanded affix "><a href="../index.html">Introduction</a></li><li class="chapter-item expanded affix "><li class="part-title">User Guide</li><li class="chapter-item expanded "><a href="../guide/installation.html"><strong aria-hidden="true">1.</strong> Installation</a></li><li class="chapter-item expanded "><a href="../guide/reading.html"><strong aria-hidden="true">2.</strong> Reading Books</a></li><li class="chapter-item expanded "><a href="../guide/creating.html"><strong aria-hidden="true">3.</strong> Creating a Book</a></li><li class="chapter-item expanded affix "><li class="part-title">Reference Guide</li><li class="chapter-item expanded "><a href="../cli/index.html"><strong aria-hidden="true">4.</strong> Command Line Tool</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../cli/init.html" class="active"><strong aria-hidden="true">4.1.</strong> init</a></li><li class="chapter-item expanded "><a href="../cli/build.html"><strong aria-hidden="true">4.2.</strong> build</a></li><li class="chapter-item expanded "><a href="../cli/watch.html"><strong aria-hidden="true">4.3.</strong> watch</a></li><li class="chapter-item expanded "><a href="../cli/serve.html"><strong aria-hidden="true">4.4.</strong> serve</a></li><li class="chapter-item expanded "><a href="../cli/test.html"><strong aria-hidden="true">4.5.</strong> test</a></li><li class="chapter-item expanded "><a href="../cli/clean.html"><strong aria-hidden="true">4.6.</strong> clean</a></li><li class="chapter-item expanded "><a href="../cli/completions.html"><strong aria-hidden="true">4.7.</strong> completions</a></li></ol></li><li class="chapter-item expanded "><a href="../format/index.html"><strong aria-hidden="true">5.</strong> Format</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../format/summary.html"><strong aria-hidden="true">5.1.</strong> SUMMARY.md</a></li><li><ol class="section"><li class="chapter-item expanded "><div><strong aria-hidden="true">5.1.1.</strong> Draft chapter</div></li></ol></li><li class="chapter-item expanded "><a href="../format/configuration/index.html"><strong aria-hidden="true">5.2.</strong> Configuration</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../format/configuration/general.html"><strong aria-hidden="true">5.2.1.</strong> General</a></li><li class="chapter-item expanded "><a href="../format/configuration/preprocessors.html"><strong aria-hidden="true">5.2.2.</strong> Preprocessors</a></li><li class="chapter-item expanded "><a href="../format/configuration/renderers.html"><strong aria-hidden="true">5.2.3.</strong> Renderers</a></li><li class="chapter-item expanded "><a href="../format/configuration/environment-variables.html"><strong aria-hidden="true">5.2.4.</strong> Environment Variables</a></li></ol></li><li class="chapter-item expanded "><a href="../format/theme/index.html"><strong aria-hidden="true">5.3.</strong> Theme</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../format/theme/index-hbs.html"><strong aria-hidden="true">5.3.1.</strong> index.hbs</a></li><li class="chapter-item expanded "><a href="../format/theme/syntax-highlighting.html"><strong aria-hidden="true">5.3.2.</strong> Syntax highlighting</a></li><li class="chapter-item expanded "><a href="../format/theme/editor.html"><strong aria-hidden="true">5.3.3.</strong> Editor</a></li></ol></li><li class="chapter-item expanded "><a href="../format/mathjax.html"><strong aria-hidden="true">5.4.</strong> MathJax Support</a></li><li class="chapter-item expanded "><a href="../format/mdbook.html"><strong aria-hidden="true">5.5.</strong> mdBook-specific features</a></li><li class="chapter-item expanded "><a href="../format/markdown.html"><strong aria-hidden="true">5.6.</strong> Markdown</a></li></ol></li><li class="chapter-item expanded "><a href="../continuous-integration.html"><strong aria-hidden="true">6.</strong> Continuous Integration</a></li><li class="chapter-item expanded "><a href="../for_developers/index.html"><strong aria-hidden="true">7.</strong> For Developers</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../for_developers/preprocessors.html"><strong aria-hidden="true">7.1.</strong> Preprocessors</a></li><li class="chapter-item expanded "><a href="../for_developers/backends.html"><strong aria-hidden="true">7.2.</strong> Alternative Backends</a></li><li class="spacer"></li></ol></li><li class="chapter-item expanded "><a href="../misc/contributors.html">Contributors</a></li></ol>
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<h1 id="the-init-command"><a class="header" href="#the-init-command">The init command</a></h1>
<p>There is some minimal boilerplate that is the same for every new book. It's for
this purpose that mdBook includes an <code>init</code> command.</p>
<p>The <code>init</code> command is used like this:</p>
<pre><code class="language-bash">mdbook init
</code></pre>
<p>When using the <code>init</code> command for the first time, a couple of files will be set
up for you:</p>
<pre><code class="language-bash">book-test/
├── book
└── src
├── chapter_1.md
└── SUMMARY.md
</code></pre>
<ul>
<li>
<p>The <code>src</code> directory is where you write your book in markdown. It contains all
the source files, configuration files, etc.</p>
</li>
<li>
<p>The <code>book</code> directory is where your book is rendered. All the output is ready
to be uploaded to a server to be seen by your audience.</p>
</li>
<li>
<p>The <code>SUMMARY.md</code> is the skeleton of your
book, and is discussed in more detail <a href="../format/summary.html">in another
chapter</a>.</p>
</li>
</ul>
<h4 id="tip-generate-chapters-from-summarymd"><a class="header" href="#tip-generate-chapters-from-summarymd">Tip: Generate chapters from SUMMARY.md</a></h4>
<p>When a <code>SUMMARY.md</code> file already exists, the <code>init</code> command will first parse it
and generate the missing files according to the paths used in the <code>SUMMARY.md</code>.
This allows you to think and create the whole structure of your book and then
let mdBook generate it for you.</p>
<h4 id="specify-a-directory"><a class="header" href="#specify-a-directory">Specify a directory</a></h4>
<p>The <code>init</code> command can take a directory as an argument to use as the book's root
instead of the current working directory.</p>
<pre><code class="language-bash">mdbook init path/to/book
</code></pre>
<h4 id="--theme"><a class="header" href="#--theme">--theme</a></h4>
<p>When you use the <code>--theme</code> flag, the default theme will be copied into a
directory called <code>theme</code> in your source directory so that you can modify it.</p>
<p>The theme is selectively overwritten, this means that if you don't want to
overwrite a specific file, just delete it and the default file will be used.</p>
<h4 id="--title"><a class="header" href="#--title">--title</a></h4>
<p>Specify a title for the book. If not supplied, an interactive prompt will ask for
a title.</p>
<pre><code class="language-bash">mdbook init --title="my amazing book"
</code></pre>
<h4 id="--ignore"><a class="header" href="#--ignore">--ignore</a></h4>
<p>Create a <code>.gitignore</code> file configured to ignore the <code>book</code> directory created when <a href="build.html">building</a> a book.
If not supplied, an interactive prompt will ask whether it should be created.</p>
<pre><code class="language-bash">mdbook init --ignore=none
</code></pre>
<pre><code class="language-bash">mdbook init --ignore=git
</code></pre>
<h4 id="--force"><a class="header" href="#--force">--force</a></h4>
<p>Skip the prompts to create a <code>.gitignore</code> and for the title for the book.</p>
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<h1 id="the-serve-command"><a class="header" href="#the-serve-command">The serve command</a></h1>
<p>The serve command is used to preview a book by serving it via HTTP at
<code>localhost:3000</code> by default:</p>
<pre><code class="language-bash">mdbook serve
</code></pre>
<p>The <code>serve</code> command watches the book's <code>src</code> directory for
changes, rebuilding the book and refreshing clients for each change; this includes
re-creating deleted files still mentioned in <code>SUMMARY.md</code>! A websocket
connection is used to trigger the client-side refresh.</p>
<p><em><strong>Note:</strong></em> <em>The <code>serve</code> command is for testing a book's HTML output, and is not
intended to be a complete HTTP server for a website.</em></p>
<h4 id="specify-a-directory"><a class="header" href="#specify-a-directory">Specify a directory</a></h4>
<p>The <code>serve</code> command can take a directory as an argument to use as the book's
root instead of the current working directory.</p>
<pre><code class="language-bash">mdbook serve path/to/book
</code></pre>
<h3 id="server-options"><a class="header" href="#server-options">Server options</a></h3>
<p>The <code>serve</code> hostname defaults to <code>localhost</code>, and the port defaults to <code>3000</code>. Either option can be specified on the command line:</p>
<pre><code class="language-bash">mdbook serve path/to/book -p 8000 -n 127.0.0.1
</code></pre>
<h4 id="--open"><a class="header" href="#--open">--open</a></h4>
<p>When you use the <code>--open</code> (<code>-o</code>) flag, mdbook will open the book in your
default web browser after starting the server.</p>
<h4 id="--dest-dir"><a class="header" href="#--dest-dir">--dest-dir</a></h4>
<p>The <code>--dest-dir</code> (<code>-d</code>) option allows you to change the output directory for the
book. Relative paths are interpreted relative to the book's root directory. If
not specified it will default to the value of the <code>build.build-dir</code> key in
<code>book.toml</code>, or to <code>./book</code>.</p>
<h4 id="specify-exclude-patterns"><a class="header" href="#specify-exclude-patterns">Specify exclude patterns</a></h4>
<p>The <code>serve</code> command will not automatically trigger a build for files listed in
the <code>.gitignore</code> file in the book root directory. The <code>.gitignore</code> file may
contain file patterns described in the <a href="https://git-scm.com/docs/gitignore">gitignore
documentation</a>. This can be useful for
ignoring temporary files created by some editors.</p>
<p><em><strong>Note:</strong></em> <em>Only the <code>.gitignore</code> from the book root directory is used. Global
<code>$HOME/.gitignore</code> or <code>.gitignore</code> files in parent directories are not used.</em></p>
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<h1 id="the-test-command"><a class="header" href="#the-test-command">The test command</a></h1>
<p>When writing a book, you sometimes need to automate some tests. For example,
<a href="https://doc.rust-lang.org/stable/book/">The Rust Programming Book</a> uses a lot
of code examples that could get outdated. Therefore it is very important for
them to be able to automatically test these code examples.</p>
<p>mdBook supports a <code>test</code> command that will run all available tests in a book. At
the moment, only Rust tests are supported.</p>
<h4 id="disable-tests-on-a-code-block"><a class="header" href="#disable-tests-on-a-code-block">Disable tests on a code block</a></h4>
<p>rustdoc doesn't test code blocks which contain the <code>ignore</code> attribute:</p>
<pre><code>```rust,ignore
fn main() {}
```
</code></pre>
<p>rustdoc also doesn't test code blocks which specify a language other than Rust:</p>
<pre><code>```markdown
**Foo**: _bar_
```
</code></pre>
<p>rustdoc <em>does</em> test code blocks which have no language specified:</p>
<pre><code>```
This is going to cause an error!
```
</code></pre>
<h4 id="specify-a-directory"><a class="header" href="#specify-a-directory">Specify a directory</a></h4>
<p>The <code>test</code> command can take a directory as an argument to use as the book's root
instead of the current working directory.</p>
<pre><code class="language-bash">mdbook test path/to/book
</code></pre>
<h4 id="--library-path"><a class="header" href="#--library-path">--library-path</a></h4>
<p>The <code>--library-path</code> (<code>-L</code>) option allows you to add directories to the library
search path used by <code>rustdoc</code> when it builds and tests the examples. Multiple
directories can be specified with multiple options (<code>-L foo -L bar</code>) or with a
comma-delimited list (<code>-L foo,bar</code>). The path should point to the Cargo
<a href="https://doc.rust-lang.org/cargo/guide/build-cache.html">build cache</a> <code>deps</code> directory that
contains the build output of your project. For example, if your Rust project's book is in a directory
named <code>my-book</code>, the following command would include the crate's dependencies when running <code>test</code>:</p>
<pre><code class="language-shell">mdbook test my-book -L target/debug/deps/
</code></pre>
<p>See the <code>rustdoc</code> command-line <a href="https://doc.rust-lang.org/rustdoc/command-line-arguments.html#-l--library-path-where-to-look-for-dependencies">documentation</a>
for more information.</p>
<h4 id="--dest-dir"><a class="header" href="#--dest-dir">--dest-dir</a></h4>
<p>The <code>--dest-dir</code> (<code>-d</code>) option allows you to change the output directory for the
book. Relative paths are interpreted relative to the book's root directory. If
not specified it will default to the value of the <code>build.build-dir</code> key in
<code>book.toml</code>, or to <code>./book</code>.</p>
<h4 id="--chapter"><a class="header" href="#--chapter">--chapter</a></h4>
<p>The <code>--chapter</code> (<code>-c</code>) option allows you to test a specific chapter of the
book using the chapter name or the relative path to the chapter.</p>
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<h1 id="the-watch-command"><a class="header" href="#the-watch-command">The watch command</a></h1>
<p>The <code>watch</code> command is useful when you want your book to be rendered on every
file change. You could repeatedly issue <code>mdbook build</code> every time a file is
changed. But using <code>mdbook watch</code> once will watch your files and will trigger a
build automatically whenever you modify a file; this includes re-creating
deleted files still mentioned in <code>SUMMARY.md</code>!</p>
<h4 id="specify-a-directory"><a class="header" href="#specify-a-directory">Specify a directory</a></h4>
<p>The <code>watch</code> command can take a directory as an argument to use as the book's
root instead of the current working directory.</p>
<pre><code class="language-bash">mdbook watch path/to/book
</code></pre>
<h4 id="--open"><a class="header" href="#--open">--open</a></h4>
<p>When you use the <code>--open</code> (<code>-o</code>) option, mdbook will open the rendered book in
your default web browser.</p>
<h4 id="--dest-dir"><a class="header" href="#--dest-dir">--dest-dir</a></h4>
<p>The <code>--dest-dir</code> (<code>-d</code>) option allows you to change the output directory for the
book. Relative paths are interpreted relative to the book's root directory. If
not specified it will default to the value of the <code>build.build-dir</code> key in
<code>book.toml</code>, or to <code>./book</code>.</p>
<h4 id="specify-exclude-patterns"><a class="header" href="#specify-exclude-patterns">Specify exclude patterns</a></h4>
<p>The <code>watch</code> command will not automatically trigger a build for files listed in
the <code>.gitignore</code> file in the book root directory. The <code>.gitignore</code> file may
contain file patterns described in the <a href="https://git-scm.com/docs/gitignore">gitignore
documentation</a>. This can be useful for
ignoring temporary files created by some editors.</p>
<p><em>Note: Only <code>.gitignore</code> from book root directory is used. Global
<code>$HOME/.gitignore</code> or <code>.gitignore</code> files in parent directories are not used.</em></p>
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<h1 id="running-mdbook-in-continuous-integration"><a class="header" href="#running-mdbook-in-continuous-integration">Running <code>mdbook</code> in Continuous Integration</a></h1>
<p>There are a variety of services such as <a href="https://docs.github.com/en/actions">GitHub Actions</a> or <a href="https://docs.gitlab.com/ee/ci/">GitLab CI/CD</a> which can be used to test and deploy your book automatically.</p>
<p>The following provides some general guidelines on how to configure your service to run mdBook.
Specific recipes can be found at the <a href="https://github.com/rust-lang/mdBook/wiki/Automated-Deployment">Automated Deployment</a> wiki page.</p>
<h2 id="installing-mdbook"><a class="header" href="#installing-mdbook">Installing mdBook</a></h2>
<p>There are several different strategies for installing mdBook.
The particular method depends on your needs and preferences.</p>
<h3 id="pre-compiled-binaries"><a class="header" href="#pre-compiled-binaries">Pre-compiled binaries</a></h3>
<p>Perhaps the easiest method is to use the pre-compiled binaries found on the <a href="https://github.com/rust-lang/mdBook/releases">GitHub Releases page</a>.
A simple approach would be to use the popular <code>curl</code> CLI tool to download the executable:</p>
<pre><code class="language-sh">mkdir bin
curl -sSL https://github.com/rust-lang/mdBook/releases/download/v0.4.37/mdbook-v0.4.37-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=bin
bin/mdbook build
</code></pre>
<p>Some considerations for this approach:</p>
<ul>
<li>This is relatively fast, and does not necessarily require dealing with caching.</li>
<li>This does not require installing Rust.</li>
<li>Specifying a specific URL means you have to manually update your script to get a new version.
This may be a benefit if you want to lock to a specific version.
However, some users prefer to automatically get a newer version when they are published.</li>
<li>You are reliant on the GitHub CDN being available.</li>
</ul>
<h3 id="building-from-source"><a class="header" href="#building-from-source">Building from source</a></h3>
<p>Building from source will require having Rust installed.
Some services have Rust pre-installed, but if your service does not, you will need to add a step to install it.</p>
<p>After Rust is installed, <code>cargo install</code> can be used to build and install mdBook.
We recommend using a SemVer version specifier so that you get the latest <strong>non-breaking</strong> version of mdBook.
For example:</p>
<pre><code class="language-sh">cargo install mdbook --no-default-features --features search --vers "^0.4" --locked
</code></pre>
<p>This includes several recommended options:</p>
<ul>
<li><code>--no-default-features</code> — Disables features like the HTTP server used by <code>mdbook serve</code> that is likely not needed on CI.
This will speed up the build time significantly.</li>
<li><code>--features search</code> — Disabling default features means you should then manually enable features that you want, such as the built-in <a href="guide/reading.html#search">search</a> capability.</li>
<li><code>--vers "^0.4"</code> — This will install the most recent version of the <code>0.4</code> series.
However, versions after like <code>0.5.0</code> won't be installed, as they may break your build.
Cargo will automatically upgrade mdBook if you have an older version already installed.</li>
<li><code>--locked</code> — This will use the dependencies that were used when mdBook was released.
Without <code>--locked</code>, it will use the latest version of all dependencies, which may include some fixes since the last release, but may also (rarely) cause build problems.</li>
</ul>
<p>You will likely want to investigate caching options, as building mdBook can be somewhat slow.</p>
<h2 id="running-tests"><a class="header" href="#running-tests">Running tests</a></h2>
<p>You may want to run tests using <a href="cli/test.html"><code>mdbook test</code></a> every time you push a change or create a pull request.
This can be used to validate Rust code examples in the book.</p>
<p>This will require having Rust installed.
Some services have Rust pre-installed, but if your service does not, you will need to add a step to install it.</p>
<p>Other than making sure the appropriate version of Rust is installed, there's not much more than just running <code>mdbook test</code> from the book directory.</p>
<p>You may also want to consider running other kinds of tests, like <a href="https://github.com/Michael-F-Bryan/mdbook-linkcheck#continuous-integration">mdbook-linkcheck</a> which will check for broken links.
Or if you have your own style checks, spell checker, or any other tests it might be good to run them in CI.</p>
<h2 id="deploying"><a class="header" href="#deploying">Deploying</a></h2>
<p>You may want to automatically deploy your book.
Some may want to do this every time a change is pushed, and others may want to only deploy when a specific release is tagged.</p>
<p>You'll also need to understand the specifics on how to push a change to your web service.
For example, <a href="https://docs.github.com/en/pages">GitHub Pages</a> just requires committing the output onto a specific git branch.
Other services may require using something like SSH to connect to a remote server.</p>
<p>The basic outline is that you need to run <code>mdbook build</code> to generate the output, and then transfer the files (which are in the <code>book</code> directory) to the correct location.</p>
<p>You may then want to consider if you need to invalidate any caches on your web service.</p>
<p>See the <a href="https://github.com/rust-lang/mdBook/wiki/Automated-Deployment">Automated Deployment</a> wiki page for examples of various different services.</p>
<h3 id="404-handling"><a class="header" href="#404-handling">404 handling</a></h3>
<p>mdBook automatically generates a 404 page to be used for broken links.
The default output is a file named <code>404.html</code> at the root of the book.
Some services like <a href="https://docs.github.com/en/pages">GitHub Pages</a> will automatically use this page for broken links.
For other services, you may want to consider configuring the web server to use this page as it will provide the reader navigation to get back to the book.</p>
<p>If your book is not deployed at the root of the domain, then you should set the <a href="format/configuration/renderers.html#html-renderer-options"><code>output.html.site-url</code></a> setting so that the 404 page works correctly.
It needs to know where the book is deployed in order to load the static files (like CSS) correctly.
For example, this guide is deployed at <a href="https://rust-lang.github.io/mdBook/">https://rust-lang.github.io/mdBook/</a>, and the <code>site-url</code> setting is configured like this:</p>
<pre><code class="language-toml"># book.toml
[output.html]
site-url = "/mdBook/"
</code></pre>
<p>You can customize the look of the 404 page by creating a file named <code>src/404.md</code> in your book.
If you want to use a different filename, you can set <a href="format/configuration/renderers.html#html-renderer-options"><code>output.html.input-404</code></a> to a different filename.</p>
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use crate::nop_lib::Nop;
use clap::{Arg, ArgMatches, Command};
use mdbook::book::Book;
use mdbook::errors::Error;
use mdbook::preprocess::{CmdPreprocessor, Preprocessor, PreprocessorContext};
use semver::{Version, VersionReq};
use std::io;
use std::process;
pub fn make_app() -> Command {
Command::new("nop-preprocessor")
.about("A mdbook preprocessor which does precisely nothing")
.subcommand(
Command::new("supports")
.arg(Arg::new("renderer").required(true))
.about("Check whether a renderer is supported by this preprocessor"),
)
}
fn main() {
let matches = make_app().get_matches();
// Users will want to construct their own preprocessor here
let preprocessor = Nop::new();
if let Some(sub_args) = matches.subcommand_matches("supports") {
handle_supports(&preprocessor, sub_args);
} else if let Err(e) = handle_preprocessing(&preprocessor) {
eprintln!("{}", e);
process::exit(1);
}
}
fn handle_preprocessing(pre: &dyn Preprocessor) -> Result<(), Error> {
let (ctx, book) = CmdPreprocessor::parse_input(io::stdin())?;
let book_version = Version::parse(&ctx.mdbook_version)?;
let version_req = VersionReq::parse(mdbook::MDBOOK_VERSION)?;
if !version_req.matches(&book_version) {
eprintln!(
"Warning: The {} plugin was built against version {} of mdbook, \
but we're being called from version {}",
pre.name(),
mdbook::MDBOOK_VERSION,
ctx.mdbook_version
);
}
let processed_book = pre.run(&ctx, book)?;
serde_json::to_writer(io::stdout(), &processed_book)?;
Ok(())
}
fn handle_supports(pre: &dyn Preprocessor, sub_args: &ArgMatches) -> ! {
let renderer = sub_args
.get_one::<String>("renderer")
.expect("Required argument");
let supported = pre.supports_renderer(renderer);
// Signal whether the renderer is supported by exiting with 1 or 0.
if supported {
process::exit(0);
} else {
process::exit(1);
}
}
/// The actual implementation of the `Nop` preprocessor. This would usually go
/// in your main `lib.rs` file.
mod nop_lib {
use super::*;
/// A no-op preprocessor.
pub struct Nop;
impl Nop {
pub fn new() -> Nop {
Nop
}
}
impl Preprocessor for Nop {
fn name(&self) -> &str {
"nop-preprocessor"
}
fn run(&self, ctx: &PreprocessorContext, book: Book) -> Result<Book, Error> {
// In testing we want to tell the preprocessor to blow up by setting a
// particular config value
if let Some(nop_cfg) = ctx.config.get_preprocessor(self.name()) {
if nop_cfg.contains_key("blow-up") {
anyhow::bail!("Boom!!1!");
}
}
// we *are* a no-op preprocessor after all
Ok(book)
}
fn supports_renderer(&self, renderer: &str) -> bool {
renderer != "not-supported"
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn nop_preprocessor_run() {
let input_json = r##"[
{
"root": "/path/to/book",
"config": {
"book": {
"authors": ["AUTHOR"],
"language": "en",
"multilingual": false,
"src": "src",
"title": "TITLE"
},
"preprocessor": {
"nop": {}
}
},
"renderer": "html",
"mdbook_version": "0.4.21"
},
{
"sections": [
{
"Chapter": {
"name": "Chapter 1",
"content": "# Chapter 1\n",
"number": [1],
"sub_items": [],
"path": "chapter_1.md",
"source_path": "chapter_1.md",
"parent_names": []
}
}
],
"__non_exhaustive": null
}
]"##;
let input_json = input_json.as_bytes();
let (ctx, book) = mdbook::preprocess::CmdPreprocessor::parse_input(input_json).unwrap();
let expected_book = book.clone();
let result = Nop::new().run(&ctx, book);
assert!(result.is_ok());
// The nop-preprocessor should not have made any changes to the book content.
let actual_book = result.unwrap();
assert_eq!(actual_book, expected_book);
}
}
}

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<h1 id="alternative-backends"><a class="header" href="#alternative-backends">Alternative Backends</a></h1>
<p>A "backend" is simply a program which <code>mdbook</code> will invoke during the book
rendering process. This program is passed a JSON representation of the book and
configuration information via <code>stdin</code>. Once the backend receives this
information it is free to do whatever it wants.</p>
<p>See <a href="../format/configuration/renderers.html">Configuring Renderers</a> for more information about using backends.</p>
<p>The community has developed several backends.
See the <a href="https://github.com/rust-lang/mdBook/wiki/Third-party-plugins">Third Party Plugins</a> wiki page for a list of available backends.</p>
<h2 id="setting-up"><a class="header" href="#setting-up">Setting Up</a></h2>
<p>This page will step you through creating your own alternative backend in the form
of a simple word counting program. Although it will be written in Rust, there's
no reason why it couldn't be accomplished using something like Python or Ruby.</p>
<p>First you'll want to create a new binary program and add <code>mdbook</code> as a
dependency.</p>
<pre><code class="language-shell">$ cargo new --bin mdbook-wordcount
$ cd mdbook-wordcount
$ cargo add mdbook
</code></pre>
<p>When our <code>mdbook-wordcount</code> plugin is invoked, <code>mdbook</code> will send it a JSON
version of <a href="https://docs.rs/mdbook/*/mdbook/renderer/struct.RenderContext.html"><code>RenderContext</code></a> via our plugin's <code>stdin</code>. For convenience, there's
a <a href="https://docs.rs/mdbook/*/mdbook/renderer/struct.RenderContext.html#method.from_json"><code>RenderContext::from_json()</code></a> constructor which will load a <code>RenderContext</code>.</p>
<p>This is all the boilerplate necessary for our backend to load the book.</p>
<pre><pre class="playground"><code class="language-rust edition2018">// src/main.rs
extern crate mdbook;
use std::io;
use mdbook::renderer::RenderContext;
fn main() {
let mut stdin = io::stdin();
let ctx = RenderContext::from_json(&amp;mut stdin).unwrap();
}</code></pre></pre>
<blockquote>
<p><strong>Note:</strong> The <code>RenderContext</code> contains a <code>version</code> field. This lets backends
figure out whether they are compatible with the version of <code>mdbook</code> it's being
called by. This <code>version</code> comes directly from the corresponding field in
<code>mdbook</code>'s <code>Cargo.toml</code>.</p>
</blockquote>
<p>It is recommended that backends use the <a href="https://crates.io/crates/semver"><code>semver</code></a> crate to inspect this field
and emit a warning if there may be a compatibility issue.</p>
<h2 id="inspecting-the-book"><a class="header" href="#inspecting-the-book">Inspecting the Book</a></h2>
<p>Now our backend has a copy of the book, lets count how many words are in each
chapter!</p>
<p>Because the <code>RenderContext</code> contains a <a href="https://docs.rs/mdbook/*/mdbook/book/struct.Book.html"><code>Book</code></a> field (<code>book</code>), and a <code>Book</code> has
the <a href="https://docs.rs/mdbook/*/mdbook/book/struct.Book.html#method.iter"><code>Book::iter()</code></a> method for iterating over all items in a <code>Book</code>, this step
turns out to be just as easy as the first.</p>
<pre><pre class="playground"><code class="language-rust edition2018">
fn main() {
let mut stdin = io::stdin();
let ctx = RenderContext::from_json(&amp;mut stdin).unwrap();
for item in ctx.book.iter() {
if let BookItem::Chapter(ref ch) = *item {
let num_words = count_words(ch);
println!("{}: {}", ch.name, num_words);
}
}
}
fn count_words(ch: &amp;Chapter) -&gt; usize {
ch.content.split_whitespace().count()
}</code></pre></pre>
<h2 id="enabling-the-backend"><a class="header" href="#enabling-the-backend">Enabling the Backend</a></h2>
<p>Now we've got the basics running, we want to actually use it. First, install the
program.</p>
<pre><code class="language-shell">$ cargo install --path .
</code></pre>
<p>Then <code>cd</code> to the particular book you'd like to count the words of and update its
<code>book.toml</code> file.</p>
<pre><code class="language-diff"> [book]
title = "mdBook Documentation"
description = "Create book from markdown files. Like Gitbook but implemented in Rust"
authors = ["Mathieu David", "Michael-F-Bryan"]
+ [output.html]
+ [output.wordcount]
</code></pre>
<p>When it loads a book into memory, <code>mdbook</code> will inspect your <code>book.toml</code> file to
try and figure out which backends to use by looking for all <code>output.*</code> tables.
If none are provided it'll fall back to using the default HTML renderer.</p>
<p>Notably, this means if you want to add your own custom backend you'll also need
to make sure to add the HTML backend, even if its table just stays empty.</p>
<p>Now you just need to build your book like normal, and everything should <em>Just
Work</em>.</p>
<pre><code class="language-shell">$ mdbook build
...
2018-01-16 07:31:15 [INFO] (mdbook::renderer): Invoking the "mdbook-wordcount" renderer
mdBook: 126
Command Line Tool: 224
init: 283
build: 145
watch: 146
serve: 292
test: 139
Format: 30
SUMMARY.md: 259
Configuration: 784
Theme: 304
index.hbs: 447
Syntax highlighting: 314
MathJax Support: 153
Rust code specific features: 148
For Developers: 788
Alternative Backends: 710
Contributors: 85
</code></pre>
<p>The reason we didn't need to specify the full name/path of our <code>wordcount</code>
backend is because <code>mdbook</code> will try to <em>infer</em> the program's name via
convention. The executable for the <code>foo</code> backend is typically called
<code>mdbook-foo</code>, with an associated <code>[output.foo]</code> entry in the <code>book.toml</code>. To
explicitly tell <code>mdbook</code> what command to invoke (it may require command-line
arguments or be an interpreted script), you can use the <code>command</code> field.</p>
<pre><code class="language-diff"> [book]
title = "mdBook Documentation"
description = "Create book from markdown files. Like Gitbook but implemented in Rust"
authors = ["Mathieu David", "Michael-F-Bryan"]
[output.html]
[output.wordcount]
+ command = "python /path/to/wordcount.py"
</code></pre>
<h2 id="configuration"><a class="header" href="#configuration">Configuration</a></h2>
<p>Now imagine you don't want to count the number of words on a particular chapter
(it might be generated text/code, etc). The canonical way to do this is via the
usual <code>book.toml</code> configuration file by adding items to your <code>[output.foo]</code>
table.</p>
<p>The <code>Config</code> can be treated roughly as a nested hashmap which lets you call
methods like <code>get()</code> to access the config's contents, with a
<code>get_deserialized()</code> convenience method for retrieving a value and automatically
deserializing to some arbitrary type <code>T</code>.</p>
<p>To implement this, we'll create our own serializable <code>WordcountConfig</code> struct
which will encapsulate all configuration for this backend.</p>
<p>First add <code>serde</code> and <code>serde_derive</code> to your <code>Cargo.toml</code>,</p>
<pre><code>$ cargo add serde serde_derive
</code></pre>
<p>And then you can create the config struct,</p>
<pre><pre class="playground"><code class="language-rust edition2018"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>extern crate serde;
#[macro_use]
extern crate serde_derive;
...
#[derive(Debug, Default, Serialize, Deserialize)]
#[serde(default, rename_all = "kebab-case")]
pub struct WordcountConfig {
pub ignores: Vec&lt;String&gt;,
}
<span class="boring">}</span></code></pre></pre>
<p>Now we just need to deserialize the <code>WordcountConfig</code> from our <code>RenderContext</code>
and then add a check to make sure we skip ignored chapters.</p>
<pre><code class="language-diff"> fn main() {
let mut stdin = io::stdin();
let ctx = RenderContext::from_json(&amp;mut stdin).unwrap();
+ let cfg: WordcountConfig = ctx.config
+ .get_deserialized("output.wordcount")
+ .unwrap_or_default();
for item in ctx.book.iter() {
if let BookItem::Chapter(ref ch) = *item {
+ if cfg.ignores.contains(&amp;ch.name) {
+ continue;
+ }
+
let num_words = count_words(ch);
println!("{}: {}", ch.name, num_words);
}
}
}
</code></pre>
<h2 id="output-and-signalling-failure"><a class="header" href="#output-and-signalling-failure">Output and Signalling Failure</a></h2>
<p>While it's nice to print word counts to the terminal when a book is built, it
might also be a good idea to output them to a file somewhere. <code>mdbook</code> tells a
backend where it should place any generated output via the <code>destination</code> field
in <a href="https://docs.rs/mdbook/*/mdbook/renderer/struct.RenderContext.html"><code>RenderContext</code></a>.</p>
<pre><code class="language-diff">+ use std::fs::{self, File};
+ use std::io::{self, Write};
- use std::io;
use mdbook::renderer::RenderContext;
use mdbook::book::{BookItem, Chapter};
fn main() {
...
+ let _ = fs::create_dir_all(&amp;ctx.destination);
+ let mut f = File::create(ctx.destination.join("wordcounts.txt")).unwrap();
+
for item in ctx.book.iter() {
if let BookItem::Chapter(ref ch) = *item {
...
let num_words = count_words(ch);
println!("{}: {}", ch.name, num_words);
+ writeln!(f, "{}: {}", ch.name, num_words).unwrap();
}
}
}
</code></pre>
<blockquote>
<p><strong>Note:</strong> There is no guarantee that the destination directory exists or is
empty (<code>mdbook</code> may leave the previous contents to let backends do caching),
so it's always a good idea to create it with <code>fs::create_dir_all()</code>.</p>
<p>If the destination directory already exists, don't assume it will be empty.
To allow backends to cache the results from previous runs, <code>mdbook</code> may leave
old content in the directory.</p>
</blockquote>
<p>There's always the possibility that an error will occur while processing a book
(just look at all the <code>unwrap()</code>'s we've written already), so <code>mdbook</code> will
interpret a non-zero exit code as a rendering failure.</p>
<p>For example, if we wanted to make sure all chapters have an <em>even</em> number of
words, erroring out if an odd number is encountered, then you may do something
like this:</p>
<pre><code class="language-diff">+ use std::process;
...
fn main() {
...
for item in ctx.book.iter() {
if let BookItem::Chapter(ref ch) = *item {
...
let num_words = count_words(ch);
println!("{}: {}", ch.name, num_words);
writeln!(f, "{}: {}", ch.name, num_words).unwrap();
+ if cfg.deny_odds &amp;&amp; num_words % 2 == 1 {
+ eprintln!("{} has an odd number of words!", ch.name);
+ process::exit(1);
+ }
}
}
}
#[derive(Debug, Default, Serialize, Deserialize)]
#[serde(default, rename_all = "kebab-case")]
pub struct WordcountConfig {
pub ignores: Vec&lt;String&gt;,
+ pub deny_odds: bool,
}
</code></pre>
<p>Now, if we reinstall the backend and build a book,</p>
<pre><code class="language-shell">$ cargo install --path . --force
$ mdbook build /path/to/book
...
2018-01-16 21:21:39 [INFO] (mdbook::renderer): Invoking the "wordcount" renderer
mdBook: 126
Command Line Tool: 224
init: 283
init has an odd number of words!
2018-01-16 21:21:39 [ERROR] (mdbook::renderer): Renderer exited with non-zero return code.
2018-01-16 21:21:39 [ERROR] (mdbook::utils): Error: Rendering failed
2018-01-16 21:21:39 [ERROR] (mdbook::utils): Caused By: The "mdbook-wordcount" renderer failed
</code></pre>
<p>As you've probably already noticed, output from the plugin's subprocess is
immediately passed through to the user. It is encouraged for plugins to follow
the "rule of silence" and only generate output when necessary (e.g. an error in
generation or a warning).</p>
<p>All environment variables are passed through to the backend, allowing you to use
the usual <code>RUST_LOG</code> to control logging verbosity.</p>
<h2 id="wrapping-up"><a class="header" href="#wrapping-up">Wrapping Up</a></h2>
<p>Although contrived, hopefully this example was enough to show how you'd create
an alternative backend for <code>mdbook</code>. If you feel it's missing something, don't
hesitate to create an issue in the <a href="https://github.com/rust-lang/mdBook/issues">issue tracker</a> so we can improve the user
guide.</p>
<p>The existing backends mentioned towards the start of this chapter should serve
as a good example of how it's done in real life, so feel free to skim through
the source code or ask questions.</p>
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<p>While <code>mdbook</code> is mainly used as a command line tool, you can also import the
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<p>The <code>mdbook</code> binary is just a wrapper around the <code>mdbook</code> crate, exposing its
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<h1 id="preprocessors"><a class="header" href="#preprocessors">Preprocessors</a></h1>
<p>A <em>preprocessor</em> is simply a bit of code which gets run immediately after the
book is loaded and before it gets rendered, allowing you to update and mutate
the book. Possible use cases are:</p>
<ul>
<li>Creating custom helpers like <code>{{#include /path/to/file.md}}</code></li>
<li>Substituting in latex-style expressions (<code>$$ \frac{1}{3} $$</code>) with their
mathjax equivalents</li>
</ul>
<p>See <a href="../format/configuration/preprocessors.html">Configuring Preprocessors</a> for more information about using preprocessors.</p>
<h2 id="hooking-into-mdbook"><a class="header" href="#hooking-into-mdbook">Hooking Into MDBook</a></h2>
<p>MDBook uses a fairly simple mechanism for discovering third party plugins.
A new table is added to <code>book.toml</code> (e.g. <code>[preprocessor.foo]</code> for the <code>foo</code>
preprocessor) and then <code>mdbook</code> will try to invoke the <code>mdbook-foo</code> program as
part of the build process.</p>
<p>Once the preprocessor has been defined and the build process starts, mdBook executes the command defined in the <code>preprocessor.foo.command</code> key twice.
The first time it runs the preprocessor to determine if it supports the given renderer.
mdBook passes two arguments to the process: the first argument is the string <code>supports</code> and the second argument is the renderer name.
The preprocessor should exit with a status code 0 if it supports the given renderer, or return a non-zero exit code if it does not.</p>
<p>If the preprocessor supports the renderer, then mdbook runs it a second time, passing JSON data into stdin.
The JSON consists of an array of <code>[context, book]</code> where <code>context</code> is the serialized object <a href="https://docs.rs/mdbook/latest/mdbook/preprocess/struct.PreprocessorContext.html"><code>PreprocessorContext</code></a> and <code>book</code> is a <a href="https://docs.rs/mdbook/latest/mdbook/book/struct.Book.html"><code>Book</code></a> object containing the content of the book.</p>
<p>The preprocessor should return the JSON format of the <a href="https://docs.rs/mdbook/latest/mdbook/book/struct.Book.html"><code>Book</code></a> object to stdout, with any modifications it wishes to perform.</p>
<p>The easiest way to get started is by creating your own implementation of the
<code>Preprocessor</code> trait (e.g. in <code>lib.rs</code>) and then creating a shell binary which
translates inputs to the correct <code>Preprocessor</code> method. For convenience, there
is <a href="https://github.com/rust-lang/mdBook/blob/master/examples/nop-preprocessor.rs">an example no-op preprocessor</a> in the <code>examples/</code> directory which can easily
be adapted for other preprocessors.</p>
<details>
<summary>Example no-op preprocessor</summary>
<pre><pre class="playground"><code class="language-rust edition2018">// nop-preprocessors.rs
use crate::nop_lib::Nop;
use clap::{Arg, ArgMatches, Command};
use mdbook::book::Book;
use mdbook::errors::Error;
use mdbook::preprocess::{CmdPreprocessor, Preprocessor, PreprocessorContext};
use semver::{Version, VersionReq};
use std::io;
use std::process;
pub fn make_app() -&gt; Command {
Command::new("nop-preprocessor")
.about("A mdbook preprocessor which does precisely nothing")
.subcommand(
Command::new("supports")
.arg(Arg::new("renderer").required(true))
.about("Check whether a renderer is supported by this preprocessor"),
)
}
fn main() {
let matches = make_app().get_matches();
// Users will want to construct their own preprocessor here
let preprocessor = Nop::new();
if let Some(sub_args) = matches.subcommand_matches("supports") {
handle_supports(&amp;preprocessor, sub_args);
} else if let Err(e) = handle_preprocessing(&amp;preprocessor) {
eprintln!("{}", e);
process::exit(1);
}
}
fn handle_preprocessing(pre: &amp;dyn Preprocessor) -&gt; Result&lt;(), Error&gt; {
let (ctx, book) = CmdPreprocessor::parse_input(io::stdin())?;
let book_version = Version::parse(&amp;ctx.mdbook_version)?;
let version_req = VersionReq::parse(mdbook::MDBOOK_VERSION)?;
if !version_req.matches(&amp;book_version) {
eprintln!(
"Warning: The {} plugin was built against version {} of mdbook, \
but we're being called from version {}",
pre.name(),
mdbook::MDBOOK_VERSION,
ctx.mdbook_version
);
}
let processed_book = pre.run(&amp;ctx, book)?;
serde_json::to_writer(io::stdout(), &amp;processed_book)?;
Ok(())
}
fn handle_supports(pre: &amp;dyn Preprocessor, sub_args: &amp;ArgMatches) -&gt; ! {
let renderer = sub_args
.get_one::&lt;String&gt;("renderer")
.expect("Required argument");
let supported = pre.supports_renderer(renderer);
// Signal whether the renderer is supported by exiting with 1 or 0.
if supported {
process::exit(0);
} else {
process::exit(1);
}
}
/// The actual implementation of the `Nop` preprocessor. This would usually go
/// in your main `lib.rs` file.
mod nop_lib {
use super::*;
/// A no-op preprocessor.
pub struct Nop;
impl Nop {
pub fn new() -&gt; Nop {
Nop
}
}
impl Preprocessor for Nop {
fn name(&amp;self) -&gt; &amp;str {
"nop-preprocessor"
}
fn run(&amp;self, ctx: &amp;PreprocessorContext, book: Book) -&gt; Result&lt;Book, Error&gt; {
// In testing we want to tell the preprocessor to blow up by setting a
// particular config value
if let Some(nop_cfg) = ctx.config.get_preprocessor(self.name()) {
if nop_cfg.contains_key("blow-up") {
anyhow::bail!("Boom!!1!");
}
}
// we *are* a no-op preprocessor after all
Ok(book)
}
fn supports_renderer(&amp;self, renderer: &amp;str) -&gt; bool {
renderer != "not-supported"
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn nop_preprocessor_run() {
let input_json = r##"[
{
"root": "/path/to/book",
"config": {
"book": {
"authors": ["AUTHOR"],
"language": "en",
"multilingual": false,
"src": "src",
"title": "TITLE"
},
"preprocessor": {
"nop": {}
}
},
"renderer": "html",
"mdbook_version": "0.4.21"
},
{
"sections": [
{
"Chapter": {
"name": "Chapter 1",
"content": "# Chapter 1\n",
"number": [1],
"sub_items": [],
"path": "chapter_1.md",
"source_path": "chapter_1.md",
"parent_names": []
}
}
],
"__non_exhaustive": null
}
]"##;
let input_json = input_json.as_bytes();
let (ctx, book) = mdbook::preprocess::CmdPreprocessor::parse_input(input_json).unwrap();
let expected_book = book.clone();
let result = Nop::new().run(&amp;ctx, book);
assert!(result.is_ok());
// The nop-preprocessor should not have made any changes to the book content.
let actual_book = result.unwrap();
assert_eq!(actual_book, expected_book);
}
}
}</code></pre></pre>
</details>
<h2 id="hints-for-implementing-a-preprocessor"><a class="header" href="#hints-for-implementing-a-preprocessor">Hints For Implementing A Preprocessor</a></h2>
<p>By pulling in <code>mdbook</code> as a library, preprocessors can have access to the
existing infrastructure for dealing with books.</p>
<p>For example, a custom preprocessor could use the
<a href="https://docs.rs/mdbook/latest/mdbook/preprocess/trait.Preprocessor.html#method.parse_input"><code>CmdPreprocessor::parse_input()</code></a> function to deserialize the JSON written to
<code>stdin</code>. Then each chapter of the <code>Book</code> can be mutated in-place via
<a href="https://docs.rs/mdbook/latest/mdbook/book/struct.Book.html#method.for_each_mut"><code>Book::for_each_mut()</code></a>, and then written to <code>stdout</code> with the <code>serde_json</code>
crate.</p>
<p>Chapters can be accessed either directly (by recursively iterating over
chapters) or via the <code>Book::for_each_mut()</code> convenience method.</p>
<p>The <code>chapter.content</code> is just a string which happens to be markdown. While it's
entirely possible to use regular expressions or do a manual find &amp; replace,
you'll probably want to process the input into something more computer-friendly.
The <a href="https://crates.io/crates/pulldown-cmark"><code>pulldown-cmark</code></a> crate implements a production-quality event-based
Markdown parser, with the <a href="https://crates.io/crates/pulldown-cmark-to-cmark"><code>pulldown-cmark-to-cmark</code></a> crate allowing you to
translate events back into markdown text.</p>
<p>The following code block shows how to remove all emphasis from markdown,
without accidentally breaking the document.</p>
<pre><pre class="playground"><code class="language-rust edition2018"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>fn remove_emphasis(
num_removed_items: &amp;mut usize,
chapter: &amp;mut Chapter,
) -&gt; Result&lt;String&gt; {
let mut buf = String::with_capacity(chapter.content.len());
let events = Parser::new(&amp;chapter.content).filter(|e| {
let should_keep = match *e {
Event::Start(Tag::Emphasis)
| Event::Start(Tag::Strong)
| Event::End(Tag::Emphasis)
| Event::End(Tag::Strong) =&gt; false,
_ =&gt; true,
};
if !should_keep {
*num_removed_items += 1;
}
should_keep
});
cmark(events, &amp;mut buf, None).map(|_| buf).map_err(|err| {
Error::from(format!("Markdown serialization failed: {}", err))
})
}
<span class="boring">}</span></code></pre></pre>
<p>For everything else, have a look <a href="https://github.com/rust-lang/mdBook/blob/master/examples/nop-preprocessor.rs">at the complete example</a>.</p>
<h2 id="implementing-a-preprocessor-with-a-different-language"><a class="header" href="#implementing-a-preprocessor-with-a-different-language">Implementing a preprocessor with a different language</a></h2>
<p>The fact that mdBook utilizes stdin and stdout to communicate with the preprocessors makes it easy to implement them in a language other than Rust.
The following code shows how to implement a simple preprocessor in Python, which will modify the content of the first chapter.
The example below follows the configuration shown above with <code>preprocessor.foo.command</code> actually pointing to a Python script.</p>
<pre><code class="language-python">import json
import sys
if __name__ == '__main__':
if len(sys.argv) &gt; 1: # we check if we received any argument
if sys.argv[1] == "supports":
# then we are good to return an exit status code of 0, since the other argument will just be the renderer's name
sys.exit(0)
# load both the context and the book representations from stdin
context, book = json.load(sys.stdin)
# and now, we can just modify the content of the first chapter
book['sections'][0]['Chapter']['content'] = '# Hello'
# we are done with the book's modification, we can just print it to stdout,
print(json.dumps(book))
</code></pre>
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<h1 id="environment-variables"><a class="header" href="#environment-variables">Environment Variables</a></h1>
<p>All configuration values can be overridden from the command line by setting the
corresponding environment variable. Because many operating systems restrict
environment variables to be alphanumeric characters or <code>_</code>, the configuration
key needs to be formatted slightly differently to the normal <code>foo.bar.baz</code> form.</p>
<p>Variables starting with <code>MDBOOK_</code> are used for configuration. The key is created
by removing the <code>MDBOOK_</code> prefix and turning the resulting string into
<code>kebab-case</code>. Double underscores (<code>__</code>) separate nested keys, while a single
underscore (<code>_</code>) is replaced with a dash (<code>-</code>).</p>
<p>For example:</p>
<ul>
<li><code>MDBOOK_foo</code> -&gt; <code>foo</code></li>
<li><code>MDBOOK_FOO</code> -&gt; <code>foo</code></li>
<li><code>MDBOOK_FOO__BAR</code> -&gt; <code>foo.bar</code></li>
<li><code>MDBOOK_FOO_BAR</code> -&gt; <code>foo-bar</code></li>
<li><code>MDBOOK_FOO_bar__baz</code> -&gt; <code>foo-bar.baz</code></li>
</ul>
<p>So by setting the <code>MDBOOK_BOOK__TITLE</code> environment variable you can override the
book's title without needing to touch your <code>book.toml</code>.</p>
<blockquote>
<p><strong>Note:</strong> To facilitate setting more complex config items, the value of an
environment variable is first parsed as JSON, falling back to a string if the
parse fails.</p>
<p>This means, if you so desired, you could override all book metadata when
building the book with something like</p>
<pre><code class="language-shell">$ export MDBOOK_BOOK='{"title": "My Awesome Book", "authors": ["Michael-F-Bryan"]}'
$ mdbook build
</code></pre>
</blockquote>
<p>The latter case may be useful in situations where <code>mdbook</code> is invoked from a
script or CI, where it sometimes isn't possible to update the <code>book.toml</code> before
building.</p>
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<h1 id="general-configuration"><a class="header" href="#general-configuration">General Configuration</a></h1>
<p>You can configure the parameters for your book in the <em><strong>book.toml</strong></em> file.</p>
<p>Here is an example of what a <em><strong>book.toml</strong></em> file might look like:</p>
<pre><code class="language-toml">[book]
title = "Example book"
authors = ["John Doe"]
description = "The example book covers examples."
[rust]
edition = "2018"
[build]
build-dir = "my-example-book"
create-missing = false
[preprocessor.index]
[preprocessor.links]
[output.html]
additional-css = ["custom.css"]
[output.html.search]
limit-results = 15
</code></pre>
<h2 id="supported-configuration-options"><a class="header" href="#supported-configuration-options">Supported configuration options</a></h2>
<p>It is important to note that <strong>any</strong> relative path specified in the
configuration will always be taken relative from the root of the book where the
configuration file is located.</p>
<h3 id="general-metadata"><a class="header" href="#general-metadata">General metadata</a></h3>
<p>This is general information about your book.</p>
<ul>
<li><strong>title:</strong> The title of the book</li>
<li><strong>authors:</strong> The author(s) of the book</li>
<li><strong>description:</strong> A description for the book, which is added as meta
information in the html <code>&lt;head&gt;</code> of each page</li>
<li><strong>src:</strong> By default, the source directory is found in the directory named
<code>src</code> directly under the root folder. But this is configurable with the <code>src</code>
key in the configuration file.</li>
<li><strong>language:</strong> The main language of the book, which is used as a language attribute <code>&lt;html lang="en"&gt;</code> for example.
This is also used to derive the direction of text (RTL, LTR) within the book.</li>
<li><strong>text-direction</strong>: The direction of text in the book: Left-to-right (LTR) or Right-to-left (RTL). Possible values: <code>ltr</code>, <code>rtl</code>.
When not specified, the text direction is derived from the book's <code>language</code> attribute.</li>
</ul>
<p><strong>book.toml</strong></p>
<pre><code class="language-toml">[book]
title = "Example book"
authors = ["John Doe", "Jane Doe"]
description = "The example book covers examples."
src = "my-src" # the source files will be found in `root/my-src` instead of `root/src`
language = "en"
text-direction = "ltr"
</code></pre>
<h3 id="rust-options"><a class="header" href="#rust-options">Rust options</a></h3>
<p>Options for the Rust language, relevant to running tests and playground
integration.</p>
<pre><code class="language-toml">[rust]
edition = "2015" # the default edition for code blocks
</code></pre>
<ul>
<li>
<p><strong>edition</strong>: Rust edition to use by default for the code snippets. Default
is "2015". Individual code blocks can be controlled with the <code>edition2015</code>,
<code>edition2018</code> or <code>edition2021</code> annotations, such as:</p>
<pre><code class="language-text">```rust,edition2015
// This only works in 2015.
let try = true;
```
</code></pre>
</li>
</ul>
<h3 id="build-options"><a class="header" href="#build-options">Build options</a></h3>
<p>This controls the build process of your book.</p>
<pre><code class="language-toml">[build]
build-dir = "book" # the directory where the output is placed
create-missing = true # whether or not to create missing pages
use-default-preprocessors = true # use the default preprocessors
extra-watch-dirs = [] # directories to watch for triggering builds
</code></pre>
<ul>
<li>
<p><strong>build-dir:</strong> The directory to put the rendered book in. By default this is
<code>book/</code> in the book's root directory.
This can overridden with the <code>--dest-dir</code> CLI option.</p>
</li>
<li>
<p><strong>create-missing:</strong> By default, any missing files specified in <code>SUMMARY.md</code>
will be created when the book is built (i.e. <code>create-missing = true</code>). If this
is <code>false</code> then the build process will instead exit with an error if any files
do not exist.</p>
</li>
<li>
<p><strong>use-default-preprocessors:</strong> Disable the default preprocessors (of <code>links</code> &amp;
<code>index</code>) by setting this option to <code>false</code>.</p>
<p>If you have the same, and/or other preprocessors declared via their table
of configuration, they will run instead.</p>
<ul>
<li>For clarity, with no preprocessor configuration, the default <code>links</code> and
<code>index</code> will run.</li>
<li>Setting <code>use-default-preprocessors = false</code> will disable these
default preprocessors from running.</li>
<li>Adding <code>[preprocessor.links]</code>, for example, will ensure, regardless of
<code>use-default-preprocessors</code> that <code>links</code> it will run.</li>
</ul>
</li>
<li>
<p><strong>extra-watch-dirs</strong>: A list of paths to directories that will be watched in
the <code>watch</code> and <code>serve</code> commands. Changes to files under these directories will
trigger rebuilds. Useful if your book depends on files outside its <code>src</code> directory.</p>
</li>
</ul>
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<h1 id="configuring-preprocessors"><a class="header" href="#configuring-preprocessors">Configuring Preprocessors</a></h1>
<p>Preprocessors are extensions that can modify the raw Markdown source before it gets sent to the renderer.</p>
<p>The following preprocessors are built-in and included by default:</p>
<ul>
<li><code>links</code>: Expands the <code>{{ #playground }}</code>, <code>{{ #include }}</code>, and <code>{{ #rustdoc_include }}</code> handlebars
helpers in a chapter to include the contents of a file.
See <a href="../mdbook.html#including-files">Including files</a> for more.</li>
<li><code>index</code>: Convert all chapter files named <code>README.md</code> into <code>index.md</code>. That is
to say, all <code>README.md</code> would be rendered to an index file <code>index.html</code> in the
rendered book.</li>
</ul>
<p>The built-in preprocessors can be disabled with the <a href="general.html#build-options"><code>build.use-default-preprocessors</code></a> config option.</p>
<p>The community has developed several preprocessors.
See the <a href="https://github.com/rust-lang/mdBook/wiki/Third-party-plugins">Third Party Plugins</a> wiki page for a list of available preprocessors.</p>
<p>For information on how to create a new preprocessor, see the <a href="../../for_developers/preprocessors.html">Preprocessors for Developers</a> chapter.</p>
<h2 id="custom-preprocessor-configuration"><a class="header" href="#custom-preprocessor-configuration">Custom Preprocessor Configuration</a></h2>
<p>Preprocessors can be added by including a <code>preprocessor</code> table in <code>book.toml</code> with the name of the preprocessor.
For example, if you have a preprocessor called <code>mdbook-example</code>, then you can include it with:</p>
<pre><code class="language-toml">[preprocessor.example]
</code></pre>
<p>With this table, mdBook will execute the <code>mdbook-example</code> preprocessor.</p>
<p>This table can include additional key-value pairs that are specific to the preprocessor.
For example, if our example preprocessor needed some extra configuration options:</p>
<pre><code class="language-toml">[preprocessor.example]
some-extra-feature = true
</code></pre>
<h2 id="locking-a-preprocessor-dependency-to-a-renderer"><a class="header" href="#locking-a-preprocessor-dependency-to-a-renderer">Locking a Preprocessor dependency to a renderer</a></h2>
<p>You can explicitly specify that a preprocessor should run for a renderer by
binding the two together.</p>
<pre><code class="language-toml">[preprocessor.example]
renderers = ["html"] # example preprocessor only runs with the HTML renderer
</code></pre>
<h2 id="provide-your-own-command"><a class="header" href="#provide-your-own-command">Provide Your Own Command</a></h2>
<p>By default when you add a <code>[preprocessor.foo]</code> table to your <code>book.toml</code> file,
<code>mdbook</code> will try to invoke the <code>mdbook-foo</code> executable. If you want to use a
different program name or pass in command-line arguments, this behaviour can
be overridden by adding a <code>command</code> field.</p>
<pre><code class="language-toml">[preprocessor.random]
command = "python random.py"
</code></pre>
<h2 id="require-a-certain-order"><a class="header" href="#require-a-certain-order">Require A Certain Order</a></h2>
<p>The order in which preprocessors are run can be controlled with the <code>before</code> and <code>after</code> fields.
For example, suppose you want your <code>linenos</code> preprocessor to process lines that may have been <code>{{#include}}</code>d; then you want it to run after the built-in <code>links</code> preprocessor, which you can require using either the <code>before</code> or <code>after</code> field:</p>
<pre><code class="language-toml">[preprocessor.linenos]
after = [ "links" ]
</code></pre>
<p>or</p>
<pre><code class="language-toml">[preprocessor.links]
before = [ "linenos" ]
</code></pre>
<p>It would also be possible, though redundant, to specify both of the above in the same config file.</p>
<p>Preprocessors having the same priority specified through <code>before</code> and <code>after</code> are sorted by name.
Any infinite loops will be detected and produce an error.</p>
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<main>
<h1 id="configuring-renderers"><a class="header" href="#configuring-renderers">Configuring Renderers</a></h1>
<p>Renderers (also called "backends") are responsible for creating the output of the book.</p>
<p>The following backends are built-in:</p>
<ul>
<li><a href="#html-renderer-options"><code>html</code></a> — This renders the book to HTML.
This is enabled by default if no other <code>[output]</code> tables are defined in <code>book.toml</code>.</li>
<li><a href="#markdown-renderer"><code>markdown</code></a> — This outputs the book as markdown after running the preprocessors.
This is useful for debugging preprocessors.</li>
</ul>
<p>The community has developed several backends.
See the <a href="https://github.com/rust-lang/mdBook/wiki/Third-party-plugins">Third Party Plugins</a> wiki page for a list of available backends.</p>
<p>For information on how to create a new backend, see the <a href="../../for_developers/backends.html">Backends for Developers</a> chapter.</p>
<h2 id="output-tables"><a class="header" href="#output-tables">Output tables</a></h2>
<p>Backends can be added by including a <code>output</code> table in <code>book.toml</code> with the name of the backend.
For example, if you have a backend called <code>mdbook-wordcount</code>, then you can include it with:</p>
<pre><code class="language-toml">[output.wordcount]
</code></pre>
<p>With this table, mdBook will execute the <code>mdbook-wordcount</code> backend.</p>
<p>This table can include additional key-value pairs that are specific to the backend.
For example, if our example backend needed some extra configuration options:</p>
<pre><code class="language-toml">[output.wordcount]
ignores = ["Example Chapter"]
</code></pre>
<p>If you define any <code>[output]</code> tables, then the <code>html</code> backend is not enabled by default.
If you want to keep the <code>html</code> backend running, then just include it in the <code>book.toml</code> file.
For example:</p>
<pre><code class="language-toml">[book]
title = "My Awesome Book"
[output.wordcount]
[output.html]
</code></pre>
<p>If more than one <code>output</code> table is included, this changes the behavior for the layout of the output directory.
If there is only one backend, then it places its output directly in the <code>book</code> directory (see <a href="general.html#build-options"><code>build.build-dir</code></a> to override this location).
If there is more than one backend, then each backend is placed in a separate directory underneath <code>book</code>.
For example, the above would have directories <code>book/html</code> and <code>book/wordcount</code>.</p>
<h3 id="custom-backend-commands"><a class="header" href="#custom-backend-commands">Custom backend commands</a></h3>
<p>By default when you add an <code>[output.foo]</code> table to your <code>book.toml</code> file,
<code>mdbook</code> will try to invoke the <code>mdbook-foo</code> executable.
If you want to use a different program name or pass in command-line arguments,
this behaviour can be overridden by adding a <code>command</code> field.</p>
<pre><code class="language-toml">[output.random]
command = "python random.py"
</code></pre>
<h3 id="optional-backends"><a class="header" href="#optional-backends">Optional backends</a></h3>
<p>If you enable a backend that isn't installed, the default behavior is to throw an error.
This behavior can be changed by marking the backend as optional:</p>
<pre><code class="language-toml">[output.wordcount]
optional = true
</code></pre>
<p>This demotes the error to a warning.</p>
<h2 id="html-renderer-options"><a class="header" href="#html-renderer-options">HTML renderer options</a></h2>
<p>The HTML renderer has a variety of options detailed below.
They should be specified in the <code>[output.html]</code> table of the <code>book.toml</code> file.</p>
<pre><code class="language-toml"># Example book.toml file with all output options.
[book]
title = "Example book"
authors = ["John Doe", "Jane Doe"]
description = "The example book covers examples."
[output.html]
theme = "my-theme"
default-theme = "light"
preferred-dark-theme = "navy"
curly-quotes = true
mathjax-support = false
copy-fonts = true
additional-css = ["custom.css", "custom2.css"]
additional-js = ["custom.js"]
no-section-label = false
git-repository-url = "https://github.com/rust-lang/mdBook"
git-repository-icon = "fa-github"
edit-url-template = "https://github.com/rust-lang/mdBook/edit/master/guide/{path}"
site-url = "/example-book/"
cname = "myproject.rs"
input-404 = "not-found.md"
</code></pre>
<p>The following configuration options are available:</p>
<ul>
<li><strong>theme:</strong> mdBook comes with a default theme and all the resource files needed
for it. But if this option is set, mdBook will selectively overwrite the theme
files with the ones found in the specified folder.</li>
<li><strong>default-theme:</strong> The theme color scheme to select by default in the
'Change Theme' dropdown. Defaults to <code>light</code>.</li>
<li><strong>preferred-dark-theme:</strong> The default dark theme. This theme will be used if
the browser requests the dark version of the site via the
<a href="https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-color-scheme">'prefers-color-scheme'</a>
CSS media query. Defaults to <code>navy</code>.</li>
<li><strong>curly-quotes:</strong> Convert straight quotes to curly quotes, except for those
that occur in code blocks and code spans. Defaults to <code>false</code>.</li>
<li><strong>mathjax-support:</strong> Adds support for <a href="../mathjax.html">MathJax</a>. Defaults to
<code>false</code>.</li>
<li><strong>copy-fonts:</strong> (<strong>Deprecated</strong>) If <code>true</code> (the default), mdBook uses its built-in fonts which are copied to the output directory.
If <code>false</code>, the built-in fonts will not be used.
This option is deprecated. If you want to define your own custom fonts,
create a <code>theme/fonts/fonts.css</code> file and store the fonts in the <code>theme/fonts/</code> directory.</li>
<li><strong>google-analytics:</strong> This field has been deprecated and will be removed in a future release.
Use the <code>theme/head.hbs</code> file to add the appropriate Google Analytics code instead.</li>
<li><strong>additional-css:</strong> If you need to slightly change the appearance of your book
without overwriting the whole style, you can specify a set of stylesheets that
will be loaded after the default ones where you can surgically change the
style.</li>
<li><strong>additional-js:</strong> If you need to add some behaviour to your book without
removing the current behaviour, you can specify a set of JavaScript files that
will be loaded alongside the default one.</li>
<li><strong>no-section-label:</strong> mdBook by defaults adds numeric section labels in the table of
contents column. For example, "1.", "2.1". Set this option to true to disable
those labels. Defaults to <code>false</code>.</li>
<li><strong>git-repository-url:</strong> A url to the git repository for the book. If provided
an icon link will be output in the menu bar of the book.</li>
<li><strong>git-repository-icon:</strong> The FontAwesome icon class to use for the git
repository link. Defaults to <code>fa-github</code> which looks like <i class="fa fa-github"></i>.
If you are not using GitHub, another option to consider is <code>fa-code-fork</code> which looks like <i class="fa fa-code-fork"></i>.</li>
<li><strong>edit-url-template:</strong> Edit url template, when provided shows a
"Suggest an edit" button (which looks like <i class="fa fa-edit"></i>) for directly jumping to editing the currently
viewed page. For e.g. GitHub projects set this to
<code>https://github.com/&lt;owner&gt;/&lt;repo&gt;/edit/&lt;branch&gt;/{path}</code> or for
Bitbucket projects set it to
<code>https://bitbucket.org/&lt;owner&gt;/&lt;repo&gt;/src/&lt;branch&gt;/{path}?mode=edit</code>
where {path} will be replaced with the full path of the file in the
repository.</li>
<li><strong>input-404:</strong> The name of the markdown file used for missing files.
The corresponding output file will be the same, with the extension replaced with <code>html</code>.
Defaults to <code>404.md</code>.</li>
<li><strong>site-url:</strong> The url where the book will be hosted. This is required to ensure
navigation links and script/css imports in the 404 file work correctly, even when accessing
urls in subdirectories. Defaults to <code>/</code>. If <code>site-url</code> is set,
make sure to use document relative links for your assets, meaning they should not start with <code>/</code>.</li>
<li><strong>cname:</strong> The DNS subdomain or apex domain at which your book will be hosted.
This string will be written to a file named CNAME in the root of your site, as
required by GitHub Pages (see <a href="https://docs.github.com/en/github/working-with-github-pages/managing-a-custom-domain-for-your-github-pages-site"><em>Managing a custom domain for your GitHub Pages
site</em></a>).</li>
</ul>
<h3 id="outputhtmlprint"><a class="header" href="#outputhtmlprint"><code>[output.html.print]</code></a></h3>
<p>The <code>[output.html.print]</code> table provides options for controlling the printable output.
By default, mdBook will include an icon on the top right of the book (which looks like <i class="fa fa-print"></i>) that will print the book as a single page.</p>
<pre><code class="language-toml">[output.html.print]
enable = true # include support for printable output
page-break = true # insert page-break after each chapter
</code></pre>
<ul>
<li><strong>enable:</strong> Enable print support. When <code>false</code>, all print support will not be
rendered. Defaults to <code>true</code>.</li>
<li><strong>page-break:</strong> Insert page breaks between chapters. Defaults to <code>true</code>.</li>
</ul>
<h3 id="outputhtmlfold"><a class="header" href="#outputhtmlfold"><code>[output.html.fold]</code></a></h3>
<p>The <code>[output.html.fold]</code> table provides options for controlling folding of the chapter listing in the navigation sidebar.</p>
<pre><code class="language-toml">[output.html.fold]
enable = false # whether or not to enable section folding
level = 0 # the depth to start folding
</code></pre>
<ul>
<li><strong>enable:</strong> Enable section-folding. When off, all folds are open.
Defaults to <code>false</code>.</li>
<li><strong>level:</strong> The higher the more folded regions are open. When level is 0, all
folds are closed. Defaults to <code>0</code>.</li>
</ul>
<h3 id="outputhtmlplayground"><a class="header" href="#outputhtmlplayground"><code>[output.html.playground]</code></a></h3>
<p>The <code>[output.html.playground]</code> table provides options for controlling Rust sample code blocks, and their integration with the <a href="https://play.rust-lang.org/">Rust Playground</a>.</p>
<pre><code class="language-toml">[output.html.playground]
editable = false # allows editing the source code
copyable = true # include the copy button for copying code snippets
copy-js = true # includes the JavaScript for the code editor
line-numbers = false # displays line numbers for editable code
runnable = true # displays a run button for rust code
</code></pre>
<ul>
<li><strong>editable:</strong> Allow editing the source code. Defaults to <code>false</code>.</li>
<li><strong>copyable:</strong> Display the copy button on code snippets. Defaults to <code>true</code>.</li>
<li><strong>copy-js:</strong> Copy JavaScript files for the editor to the output directory.
Defaults to <code>true</code>.</li>
<li><strong>line-numbers:</strong> Display line numbers on editable sections of code. Requires both <code>editable</code> and <code>copy-js</code> to be <code>true</code>. Defaults to <code>false</code>.</li>
<li><strong>runnable:</strong> Displays a run button for rust code snippets. Changing this to <code>false</code> will disable the run in playground feature globally. Defaults to <code>true</code>.</li>
</ul>
<h3 id="outputhtmlcode"><a class="header" href="#outputhtmlcode"><code>[output.html.code]</code></a></h3>
<p>The <code>[output.html.code]</code> table provides options for controlling code blocks.</p>
<pre><code class="language-toml">[output.html.code]
# A prefix string per language (one or more chars).
# Any line starting with whitespace+prefix is hidden.
hidelines = { python = "~" }
</code></pre>
<ul>
<li><strong>hidelines:</strong> A table that defines how <a href="../mdbook.html#hiding-code-lines">hidden code lines</a> work for each language.
The key is the language and the value is a string that will cause code lines starting with that prefix to be hidden.</li>
</ul>
<h3 id="outputhtmlsearch"><a class="header" href="#outputhtmlsearch"><code>[output.html.search]</code></a></h3>
<p>The <code>[output.html.search]</code> table provides options for controlling the built-in text <a href="../../guide/reading.html#search">search</a>.
mdBook must be compiled with the <code>search</code> feature enabled (on by default).</p>
<pre><code class="language-toml">[output.html.search]
enable = true # enables the search feature
limit-results = 30 # maximum number of search results
teaser-word-count = 30 # number of words used for a search result teaser
use-boolean-and = true # multiple search terms must all match
boost-title = 2 # ranking boost factor for matches in headers
boost-hierarchy = 1 # ranking boost factor for matches in page names
boost-paragraph = 1 # ranking boost factor for matches in text
expand = true # partial words will match longer terms
heading-split-level = 3 # link results to heading levels
copy-js = true # include Javascript code for search
</code></pre>
<ul>
<li><strong>enable:</strong> Enables the search feature. Defaults to <code>true</code>.</li>
<li><strong>limit-results:</strong> The maximum number of search results. Defaults to <code>30</code>.</li>
<li><strong>teaser-word-count:</strong> The number of words used for a search result teaser.
Defaults to <code>30</code>.</li>
<li><strong>use-boolean-and:</strong> Define the logical link between multiple search words. If
true, all search words must appear in each result. Defaults to <code>false</code>.</li>
<li><strong>boost-title:</strong> Boost factor for the search result score if a search word
appears in the header. Defaults to <code>2</code>.</li>
<li><strong>boost-hierarchy:</strong> Boost factor for the search result score if a search word
appears in the hierarchy. The hierarchy contains all titles of the parent
documents and all parent headings. Defaults to <code>1</code>.</li>
<li><strong>boost-paragraph:</strong> Boost factor for the search result score if a search word
appears in the text. Defaults to <code>1</code>.</li>
<li><strong>expand:</strong> True if search should match longer results e.g. search <code>micro</code>
should match <code>microwave</code>. Defaults to <code>true</code>.</li>
<li><strong>heading-split-level:</strong> Search results will link to a section of the document
which contains the result. Documents are split into sections by headings this
level or less. Defaults to <code>3</code>. (<code>### This is a level 3 heading</code>)</li>
<li><strong>copy-js:</strong> Copy JavaScript files for the search implementation to the output
directory. Defaults to <code>true</code>.</li>
</ul>
<h3 id="outputhtmlredirect"><a class="header" href="#outputhtmlredirect"><code>[output.html.redirect]</code></a></h3>
<p>The <code>[output.html.redirect]</code> table provides a way to add redirects.
This is useful when you move, rename, or remove a page to ensure that links to the old URL will go to the new location.</p>
<pre><code class="language-toml">[output.html.redirect]
"/appendices/bibliography.html" = "https://rustc-dev-guide.rust-lang.org/appendix/bibliography.html"
"/other-installation-methods.html" = "../infra/other-installation-methods.html"
</code></pre>
<p>The table contains key-value pairs where the key is where the redirect file needs to be created, as an absolute path from the build directory, (e.g. <code>/appendices/bibliography.html</code>).
The value can be any valid URI the browser should navigate to (e.g. <code>https://rust-lang.org/</code>, <code>/overview.html</code>, or <code>../bibliography.html</code>).</p>
<p>This will generate an HTML page which will automatically redirect to the given location.
Note that the source location does not support <code>#</code> anchor redirects.</p>
<h2 id="markdown-renderer"><a class="header" href="#markdown-renderer">Markdown Renderer</a></h2>
<p>The Markdown renderer will run preprocessors and then output the resulting
Markdown. This is mostly useful for debugging preprocessors, especially in
conjunction with <code>mdbook test</code> to see the Markdown that <code>mdbook</code> is passing
to <code>rustdoc</code>.</p>
<p>The Markdown renderer is included with <code>mdbook</code> but disabled by default.
Enable it by adding an empty table to your <code>book.toml</code> as follows:</p>
<pre><code class="language-toml">[output.markdown]
</code></pre>
<p>There are no configuration options for the Markdown renderer at this time;
only whether it is enabled or disabled.</p>
<p>See <a href="preprocessors.html">the preprocessors documentation</a> for how to
specify which preprocessors should run before the Markdown renderer.</p>
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<h1 id="format"><a class="header" href="#format">Format</a></h1>
<p>In this section you will learn how to:</p>
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<h1 id="markdown"><a class="header" href="#markdown">Markdown</a></h1>
<p>mdBook's <a href="https://github.com/raphlinus/pulldown-cmark">parser</a> adheres to the <a href="https://commonmark.org/">CommonMark</a> specification with some extensions described below.
You can take a quick <a href="https://commonmark.org/help/tutorial/">tutorial</a>,
or <a href="https://spec.commonmark.org/dingus/">try out</a> CommonMark in real time. A complete Markdown overview is out of scope for
this documentation, but below is a high level overview of some of the basics. For a more in-depth experience, check out the
<a href="https://www.markdownguide.org">Markdown Guide</a>.</p>
<h2 id="text-and-paragraphs"><a class="header" href="#text-and-paragraphs">Text and Paragraphs</a></h2>
<p>Text is rendered relatively predictably:</p>
<pre><code class="language-markdown">Here is a line of text.
This is a new line.
</code></pre>
<p>Will look like you might expect:</p>
<p>Here is a line of text.</p>
<p>This is a new line.</p>
<h2 id="headings"><a class="header" href="#headings">Headings</a></h2>
<p>Headings use the <code>#</code> marker and should be on a line by themselves. More <code>#</code> mean smaller headings:</p>
<pre><code class="language-markdown">### A heading
Some text.
#### A smaller heading
More text.
</code></pre>
<h3 id="a-heading"><a class="header" href="#a-heading">A heading</a></h3>
<p>Some text.</p>
<h4 id="a-smaller-heading"><a class="header" href="#a-smaller-heading">A smaller heading</a></h4>
<p>More text.</p>
<h2 id="lists"><a class="header" href="#lists">Lists</a></h2>
<p>Lists can be unordered or ordered. Ordered lists will order automatically:</p>
<pre><code class="language-markdown">* milk
* eggs
* butter
1. carrots
1. celery
1. radishes
</code></pre>
<ul>
<li>milk</li>
<li>eggs</li>
<li>butter</li>
</ul>
<ol>
<li>carrots</li>
<li>celery</li>
<li>radishes</li>
</ol>
<h2 id="links"><a class="header" href="#links">Links</a></h2>
<p>Linking to a URL or local file is easy:</p>
<pre><code class="language-markdown">Use [mdBook](https://github.com/rust-lang/mdBook).
Read about [mdBook](mdbook.md).
A bare url: &lt;https://www.rust-lang.org&gt;.
</code></pre>
<p>Use <a href="https://github.com/rust-lang/mdBook">mdBook</a>.</p>
<p>Read about <a href="mdbook.html">mdBook</a>.</p>
<p>A bare url: <a href="https://www.rust-lang.org">https://www.rust-lang.org</a>.</p>
<hr />
<p>Relative links that end with <code>.md</code> will be converted to the <code>.html</code> extension.
It is recommended to use <code>.md</code> links when possible.
This is useful when viewing the Markdown file outside of mdBook, for example on GitHub or GitLab which render Markdown automatically.</p>
<p>Links to <code>README.md</code> will be converted to <code>index.html</code>.
This is done since some services like GitHub render README files automatically, but web servers typically expect the root file to be called <code>index.html</code>.</p>
<p>You can link to individual headings with <code>#</code> fragments.
For example, <code>mdbook.md#text-and-paragraphs</code> would link to the <a href="#text-and-paragraphs">Text and Paragraphs</a> section above.
The ID is created by transforming the heading such as converting to lowercase and replacing spaces with dashes.
You can click on any heading and look at the URL in your browser to see what the fragment looks like.</p>
<h2 id="images"><a class="header" href="#images">Images</a></h2>
<p>Including images is simply a matter of including a link to them, much like in the <em>Links</em> section above. The following markdown
includes the Rust logo SVG image found in the <code>images</code> directory at the same level as this file:</p>
<pre><code class="language-markdown">![The Rust Logo](images/rust-logo-blk.svg)
</code></pre>
<p>Produces the following HTML when built with mdBook:</p>
<pre><code class="language-html">&lt;p&gt;&lt;img src="images/rust-logo-blk.svg" alt="The Rust Logo" /&gt;&lt;/p&gt;
</code></pre>
<p>Which, of course displays the image like so:</p>
<p><img src="images/rust-logo-blk.svg" alt="The Rust Logo" /></p>
<h2 id="extensions"><a class="header" href="#extensions">Extensions</a></h2>
<p>mdBook has several extensions beyond the standard CommonMark specification.</p>
<h3 id="strikethrough"><a class="header" href="#strikethrough">Strikethrough</a></h3>
<p>Text may be rendered with a horizontal line through the center by wrapping the
text with one or two tilde characters on each side:</p>
<pre><code class="language-text">An example of ~~strikethrough text~~.
</code></pre>
<p>This example will render as:</p>
<blockquote>
<p>An example of <del>strikethrough text</del>.</p>
</blockquote>
<p>This follows the <a href="https://github.github.com/gfm/#strikethrough-extension-">GitHub Strikethrough extension</a>.</p>
<h3 id="footnotes"><a class="header" href="#footnotes">Footnotes</a></h3>
<p>A footnote generates a small numbered link in the text which when clicked
takes the reader to the footnote text at the bottom of the item. The footnote
label is written similarly to a link reference with a caret at the front. The
footnote text is written like a link reference definition, with the text
following the label. Example:</p>
<pre><code class="language-text">This is an example of a footnote[^note].
[^note]: This text is the contents of the footnote, which will be rendered
towards the bottom.
</code></pre>
<p>This example will render as:</p>
<blockquote>
<p>This is an example of a footnote<sup class="footnote-reference"><a href="#note">1</a></sup>.</p>
<div class="footnote-definition" id="note"><sup class="footnote-definition-label">1</sup>
<p>This text is the contents of the footnote, which will be rendered
towards the bottom.</p>
</div>
</blockquote>
<p>The footnotes are automatically numbered based on the order the footnotes are
written.</p>
<h3 id="tables"><a class="header" href="#tables">Tables</a></h3>
<p>Tables can be written using pipes and dashes to draw the rows and columns of
the table. These will be translated to HTML table matching the shape. Example:</p>
<pre><code class="language-text">| Header1 | Header2 |
|---------|---------|
| abc | def |
</code></pre>
<p>This example will render similarly to this:</p>
<div class="table-wrapper"><table><thead><tr><th>Header1</th><th>Header2</th></tr></thead><tbody>
<tr><td>abc</td><td>def</td></tr>
</tbody></table>
</div>
<p>See the specification for the <a href="https://github.github.com/gfm/#tables-extension-">GitHub Tables extension</a> for more
details on the exact syntax supported.</p>
<h3 id="task-lists"><a class="header" href="#task-lists">Task lists</a></h3>
<p>Task lists can be used as a checklist of items that have been completed.
Example:</p>
<pre><code class="language-md">- [x] Complete task
- [ ] Incomplete task
</code></pre>
<p>This will render as:</p>
<blockquote>
<ul>
<li><input disabled="" type="checkbox" checked=""/>
Complete task</li>
<li><input disabled="" type="checkbox"/>
Incomplete task</li>
</ul>
</blockquote>
<p>See the specification for the <a href="https://github.github.com/gfm/#task-list-items-extension-">task list extension</a> for more details.</p>
<h3 id="smart-punctuation"><a class="header" href="#smart-punctuation">Smart punctuation</a></h3>
<p>Some ASCII punctuation sequences will be automatically turned into fancy Unicode
characters:</p>
<div class="table-wrapper"><table><thead><tr><th>ASCII sequence</th><th>Unicode</th></tr></thead><tbody>
<tr><td><code>--</code></td><td></td></tr>
<tr><td><code>---</code></td><td></td></tr>
<tr><td><code>...</code></td><td></td></tr>
<tr><td><code>"</code></td><td>“ or ”, depending on context</td></tr>
<tr><td><code>'</code></td><td> or , depending on context</td></tr>
</tbody></table>
</div>
<p>So, no need to manually enter those Unicode characters!</p>
<p>This feature is disabled by default.
To enable it, see the <a href="configuration/renderers.html#html-renderer-options"><code>output.html.curly-quotes</code></a> config option.</p>
<h3 id="heading-attributes"><a class="header" href="#heading-attributes">Heading attributes</a></h3>
<p>Headings can have a custom HTML ID and classes. This lets you maintain the same ID even if you change the heading's text, it also lets you add multiple classes in the heading.</p>
<p>Example:</p>
<pre><code class="language-md"># Example heading { #first .class1 .class2 }
</code></pre>
<p>This makes the level 1 heading with the content <code>Example heading</code>, ID <code>first</code>, and classes <code>class1</code> and <code>class2</code>. Note that the attributes should be space-separated.</p>
<p>More information can be found in the <a href="https://github.com/raphlinus/pulldown-cmark/blob/master/pulldown-cmark/specs/heading_attrs.txt">heading attrs spec page</a>.</p>
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<h1 id="mathjax-support"><a class="header" href="#mathjax-support">MathJax Support</a></h1>
<p>mdBook has optional support for math equations through
<a href="https://www.mathjax.org/">MathJax</a>.</p>
<p>To enable MathJax, you need to add the <code>mathjax-support</code> key to your <code>book.toml</code>
under the <code>output.html</code> section.</p>
<pre><code class="language-toml">[output.html]
mathjax-support = true
</code></pre>
<blockquote>
<p><strong>Note:</strong> The usual delimiters MathJax uses are not yet supported. You can't
currently use <code>$$ ... $$</code> as delimiters and the <code>\[ ... \]</code> delimiters need an
extra backslash to work. Hopefully this limitation will be lifted soon.</p>
</blockquote>
<blockquote>
<p><strong>Note:</strong> When you use double backslashes in MathJax blocks (for example in
commands such as <code>\begin{cases} \frac 1 2 \\ \frac 3 4 \end{cases}</code>) you need
to add <em>two extra</em> backslashes (e.g., <code>\begin{cases} \frac 1 2 \\\\ \frac 3 4 \end{cases}</code>).</p>
</blockquote>
<h3 id="inline-equations"><a class="header" href="#inline-equations">Inline equations</a></h3>
<p>Inline equations are delimited by <code>\\(</code> and <code>\\)</code>. So for example, to render the
following inline equation \( \int x dx = \frac{x^2}{2} + C \) you would write
the following:</p>
<pre><code>\\( \int x dx = \frac{x^2}{2} + C \\)
</code></pre>
<h3 id="block-equations"><a class="header" href="#block-equations">Block equations</a></h3>
<p>Block equations are delimited by <code>\\[</code> and <code>\\]</code>. To render the following
equation</p>
<p>\[ \mu = \frac{1}{N} \sum_{i=0} x_i \]</p>
<p>you would write:</p>
<pre><code class="language-bash">\\[ \mu = \frac{1}{N} \sum_{i=0} x_i \\]
</code></pre>
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<h1 id="mdbook-specific-features"><a class="header" href="#mdbook-specific-features">mdBook-specific features</a></h1>
<h2 id="hiding-code-lines"><a class="header" href="#hiding-code-lines">Hiding code lines</a></h2>
<p>There is a feature in mdBook that lets you hide code lines by prepending them with a specific prefix.</p>
<p>For the Rust language, you can use the <code>#</code> character as a prefix which will hide lines <a href="https://doc.rust-lang.org/stable/rustdoc/write-documentation/documentation-tests.html#hiding-portions-of-the-example">like you would with Rustdoc</a>.</p>
<pre><code class="language-bash"># fn main() {
let x = 5;
let y = 6;
println!("{}", x + y);
# }
</code></pre>
<p>Will render as</p>
<pre><pre class="playground"><code class="language-rust edition2018"><span class="boring">fn main() {
</span> let x = 5;
let y = 6;
println!("{}", x + y);
<span class="boring">}</span></code></pre></pre>
<p>When you tap or hover the mouse over the code block, there will be an eyeball icon (<i class="fa fa-eye"></i>) which will toggle the visibility of the hidden lines.</p>
<p>By default, this only works for code examples that are annotated with <code>rust</code>.
However, you can define custom prefixes for other languages by adding a new line-hiding prefix in your <code>book.toml</code> with the language name and prefix character(s):</p>
<pre><code class="language-toml">[output.html.code.hidelines]
python = "~"
</code></pre>
<p>The prefix will hide any lines that begin with the given prefix. With the python prefix shown above, this:</p>
<pre><code class="language-bash">~hidden()
nothidden():
~ hidden()
~hidden()
nothidden()
</code></pre>
<p>will render as</p>
<pre><code class="language-python"><span class="boring">hidden()
</span>nothidden():
<span class="boring"> hidden()
</span><span class="boring"> hidden()
</span> nothidden()
</code></pre>
<p>This behavior can be overridden locally with a different prefix. This has the same effect as above:</p>
<pre><code class="language-markdown">```python,hidelines=!!!
!!!hidden()
nothidden():
!!! hidden()
!!!hidden()
nothidden()
```
</code></pre>
<h2 id="rust-playground"><a class="header" href="#rust-playground">Rust Playground</a></h2>
<p>Rust language code blocks will automatically get a play button (<i class="fa fa-play"></i>) which will execute the code and display the output just below the code block.
This works by sending the code to the <a href="https://play.rust-lang.org/">Rust Playground</a>.</p>
<pre><pre class="playground"><code class="language-rust edition2018"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>println!("Hello, World!");
<span class="boring">}</span></code></pre></pre>
<p>If there is no <code>main</code> function, then the code is automatically wrapped inside one.</p>
<p>If you wish to disable the play button for a code block, you can include the <code>noplayground</code> option on the code block like this:</p>
<pre><code class="language-markdown">```rust,noplayground
let mut name = String::new();
std::io::stdin().read_line(&amp;mut name).expect("failed to read line");
println!("Hello {}!", name);
```
</code></pre>
<p>Or, if you wish to disable the play button for all code blocks in your book, you can write the config to the <code>book.toml</code> like this.</p>
<pre><code class="language-toml">[output.html.playground]
runnable = false
</code></pre>
<h2 id="rust-code-block-attributes"><a class="header" href="#rust-code-block-attributes">Rust code block attributes</a></h2>
<p>Additional attributes can be included in Rust code blocks with comma, space, or tab-separated terms just after the language term. For example:</p>
<pre><code class="language-markdown">```rust,ignore
# This example won't be tested.
panic!("oops!");
```
</code></pre>
<p>These are particularly important when using <a href="../cli/test.html"><code>mdbook test</code></a> to test Rust examples.
These use the same attributes as <a href="https://doc.rust-lang.org/rustdoc/documentation-tests.html#attributes">rustdoc attributes</a>, with a few additions:</p>
<ul>
<li><code>editable</code> — Enables the <a href="theme/editor.html">editor</a>.</li>
<li><code>noplayground</code> — Removes the play button, but will still be tested.</li>
<li><code>mdbook-runnable</code> — Forces the play button to be displayed.
This is intended to be combined with the <code>ignore</code> attribute for examples that should not be tested, but you want to allow the reader to run.</li>
<li><code>ignore</code> — Will not be tested and no play button is shown, but it is still highlighted as Rust syntax.</li>
<li><code>should_panic</code> — When executed, it should produce a panic.</li>
<li><code>no_run</code> — The code is compiled when tested, but it is not run.
The play button is also not shown.</li>
<li><code>compile_fail</code> — The code should fail to compile.</li>
<li><code>edition2015</code>, <code>edition2018</code>, <code>edition2021</code> — Forces the use of a specific Rust edition.
See <a href="configuration/general.html#rust-options"><code>rust.edition</code></a> to set this globally.</li>
</ul>
<h2 id="including-files"><a class="header" href="#including-files">Including files</a></h2>
<p>With the following syntax, you can include files into your book:</p>
<pre><code class="language-hbs">{{#include file.rs}}
</code></pre>
<p>The path to the file has to be relative from the current source file.</p>
<p>mdBook will interpret included files as Markdown. Since the include command
is usually used for inserting code snippets and examples, you will often
wrap the command with <code>```</code> to display the file contents without
interpreting them.</p>
<pre><code class="language-hbs">```
{{#include file.rs}}
```
</code></pre>
<h2 id="including-portions-of-a-file"><a class="header" href="#including-portions-of-a-file">Including portions of a file</a></h2>
<p>Often you only need a specific part of the file, e.g. relevant lines for an
example. We support four different modes of partial includes:</p>
<pre><code class="language-hbs">{{#include file.rs:2}}
{{#include file.rs::10}}
{{#include file.rs:2:}}
{{#include file.rs:2:10}}
</code></pre>
<p>The first command only includes the second line from file <code>file.rs</code>. The second
command includes all lines up to line 10, i.e. the lines from 11 till the end of
the file are omitted. The third command includes all lines from line 2, i.e. the
first line is omitted. The last command includes the excerpt of <code>file.rs</code>
consisting of lines 2 to 10.</p>
<p>To avoid breaking your book when modifying included files, you can also
include a specific section using anchors instead of line numbers.
An anchor is a pair of matching lines. The line beginning an anchor must
match the regex <code>ANCHOR:\s*[\w_-]+</code> and similarly the ending line must match
the regex <code>ANCHOR_END:\s*[\w_-]+</code>. This allows you to put anchors in
any kind of commented line.</p>
<p>Consider the following file to include:</p>
<pre><code class="language-rs">/* ANCHOR: all */
// ANCHOR: component
struct Paddle {
hello: f32,
}
// ANCHOR_END: component
////////// ANCHOR: system
impl System for MySystem { ... }
////////// ANCHOR_END: system
/* ANCHOR_END: all */
</code></pre>
<p>Then in the book, all you have to do is:</p>
<pre><code class="language-hbs">Here is a component:
```rust,no_run,noplayground
{{#include file.rs:component}}
```
Here is a system:
```rust,no_run,noplayground
{{#include file.rs:system}}
```
This is the full file.
```rust,no_run,noplayground
{{#include file.rs:all}}
```
</code></pre>
<p>Lines containing anchor patterns inside the included anchor are ignored.</p>
<h2 id="including-a-file-but-initially-hiding-all-except-specified-lines"><a class="header" href="#including-a-file-but-initially-hiding-all-except-specified-lines">Including a file but initially hiding all except specified lines</a></h2>
<p>The <code>rustdoc_include</code> helper is for including code from external Rust files that contain complete
examples, but only initially showing particular lines specified with line numbers or anchors in the
same way as with <code>include</code>.</p>
<p>The lines not in the line number range or between the anchors will still be included, but they will
be prefaced with <code>#</code>. This way, a reader can expand the snippet to see the complete example, and
Rustdoc will use the complete example when you run <code>mdbook test</code>.</p>
<p>For example, consider a file named <code>file.rs</code> that contains this Rust program:</p>
<pre><pre class="playground"><code class="language-rust edition2018">fn main() {
let x = add_one(2);
assert_eq!(x, 3);
}
fn add_one(num: i32) -&gt; i32 {
num + 1
}</code></pre></pre>
<p>We can include a snippet that initially shows only line 2 by using this syntax:</p>
<pre><code class="language-hbs">To call the `add_one` function, we pass it an `i32` and bind the returned value to `x`:
```rust
{{#rustdoc_include file.rs:2}}
```
</code></pre>
<p>This would have the same effect as if we had manually inserted the code and hidden all but line 2
using <code>#</code>:</p>
<pre><code class="language-hbs">To call the `add_one` function, we pass it an `i32` and bind the returned value to `x`:
```rust
# fn main() {
let x = add_one(2);
# assert_eq!(x, 3);
# }
#
# fn add_one(num: i32) -&gt; i32 {
# num + 1
# }
```
</code></pre>
<p>That is, it looks like this (click the "expand" icon to see the rest of the file):</p>
<pre><pre class="playground"><code class="language-rust edition2018"><span class="boring">fn main() {
</span> let x = add_one(2);
<span class="boring"> assert_eq!(x, 3);
</span><span class="boring">}
</span><span class="boring">
</span><span class="boring">fn add_one(num: i32) -&gt; i32 {
</span><span class="boring"> num + 1
</span><span class="boring">}</span></code></pre></pre>
<h2 id="inserting-runnable-rust-files"><a class="header" href="#inserting-runnable-rust-files">Inserting runnable Rust files</a></h2>
<p>With the following syntax, you can insert runnable Rust files into your book:</p>
<pre><code class="language-hbs">{{#playground file.rs}}
</code></pre>
<p>The path to the Rust file has to be relative from the current source file.</p>
<p>When play is clicked, the code snippet will be sent to the <a href="https://play.rust-lang.org/">Rust Playground</a> to be
compiled and run. The result is sent back and displayed directly underneath the
code.</p>
<p>Here is what a rendered code snippet looks like:</p>
<pre><pre class="playground"><code class="language-rust edition2018">fn main() {
println!("Hello World!");
<span class="boring">
</span><span class="boring"> // You can even hide lines! :D
</span><span class="boring"> println!("I am hidden! Expand the code snippet to see me");
</span>}</code></pre></pre>
<p>Any additional values passed after the filename will be included as attributes of the code block.
For example <code>{{#playground example.rs editable}}</code> will create the code block like the following:</p>
<pre><code class="language-markdown">```rust,editable
# Contents of example.rs here.
```
</code></pre>
<p>And the <code>editable</code> attribute will enable the <a href="theme/editor.html">editor</a> as described at <a href="#rust-code-block-attributes">Rust code block attributes</a>.</p>
<h2 id="controlling-page-title"><a class="header" href="#controlling-page-title">Controlling page &lt;title&gt;</a></h2>
<p>A chapter can set a &lt;title&gt; that is different from its entry in the table of
contents (sidebar) by including a <code>{{#title ...}}</code> near the top of the page.</p>
<pre><code class="language-hbs">{{#title My Title}}
</code></pre>
<h2 id="html-classes-provided-by-mdbook"><a class="header" href="#html-classes-provided-by-mdbook">HTML classes provided by mdBook</a></h2>
<img class="right" src="images/rust-logo-blk.svg" alt="The Rust logo">
<h3 id="classleft-and-right"><a class="header" href="#classleft-and-right"><code>class="left"</code> and <code>"right"</code></a></h3>
<p>These classes are provided by default, for inline HTML to float images.</p>
<pre><code class="language-html">&lt;img class="right" src="images/rust-logo-blk.svg" alt="The Rust logo"&gt;
</code></pre>
<h3 id="classhidden"><a class="header" href="#classhidden"><code>class="hidden"</code></a></h3>
<p>HTML tags with class <code>hidden</code> will not be shown.</p>
<pre><code class="language-html">&lt;div class="hidden"&gt;This will not be seen.&lt;/div&gt;
</code></pre>
<div class="hidden">This will not be seen.</div>
<h3 id="classwarning"><a class="header" href="#classwarning"><code>class="warning"</code></a></h3>
<p>To make a warning or similar note stand out, wrap it in a warning div.</p>
<pre><code class="language-html">&lt;div class="warning"&gt;
This is a bad thing that you should pay attention to.
Warning blocks should be used sparingly in documentation, to avoid "warning
fatigue," where people are trained to ignore them because they usually don't
matter for what they're doing.
&lt;/div&gt;
</code></pre>
<div class="warning">
<p>This is a bad thing that you should pay attention to.</p>
<p>Warning blocks should be used sparingly in documentation, to avoid "warning
fatigue," where people are trained to ignore them because they usually don't
matter for what they're doing.</p>
</div>
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<h1 id="summarymd"><a class="header" href="#summarymd">SUMMARY.md</a></h1>
<p>The summary file is used by mdBook to know what chapters to include, in what
order they should appear, what their hierarchy is and where the source files
are. Without this file, there is no book.</p>
<p>This markdown file must be named <code>SUMMARY.md</code>. Its formatting
is very strict and must follow the structure outlined below to allow for easy
parsing. Any element not specified below, be it formatting or textual, is likely
to be ignored at best, or may cause an error when attempting to build the book.</p>
<h3 id="structure"><a class="header" href="#structure">Structure</a></h3>
<ol>
<li>
<p><em><strong>Title</strong></em> - While optional, it's common practice to begin with a title, generally <code
class="language-markdown"># Summary</code>. This is ignored by the parser however, and
can be omitted.</p>
<pre><code class="language-markdown"># Summary
</code></pre>
</li>
<li>
<p><em><strong>Prefix Chapter</strong></em> - Before the main numbered chapters, prefix chapters can be added
that will not be numbered. This is useful for forewords,
introductions, etc. There are, however, some constraints. Prefix chapters cannot be
nested; they should all be on the root level. And you cannot add
prefix chapters once you have added numbered chapters.</p>
<pre><code class="language-markdown">[A Prefix Chapter](relative/path/to/markdown.md)
- [First Chapter](relative/path/to/markdown2.md)
</code></pre>
</li>
<li>
<p><em><strong>Part Title</strong></em> -
Level 1 headers can be used as a title for the following numbered chapters.
This can be used to logically separate different sections of the book.
The title is rendered as unclickable text.
Titles are optional, and the numbered chapters can be broken into as many parts as desired.
Part titles must be h1 headers (one <code>#</code>), other heading levels are ignored.</p>
<pre><code class="language-markdown"># My Part Title
- [First Chapter](relative/path/to/markdown.md)
</code></pre>
</li>
<li>
<p><em><strong>Numbered Chapter</strong></em> - Numbered chapters outline the main content of the book
and can be nested, resulting in a nice hierarchy
(chapters, sub-chapters, etc.).</p>
<pre><code class="language-markdown"># Title of Part
- [First Chapter](relative/path/to/markdown.md)
- [Second Chapter](relative/path/to/markdown2.md)
- [Sub Chapter](relative/path/to/markdown3.md)
# Title of Another Part
- [Another Chapter](relative/path/to/markdown4.md)
</code></pre>
<p>Numbered chapters can be denoted with either <code>-</code> or <code>*</code> (do not mix delimiters).</p>
</li>
<li>
<p><em><strong>Suffix Chapter</strong></em> - Like prefix chapters, suffix chapters are unnumbered, but they come after
numbered chapters.</p>
<pre><code class="language-markdown">- [Last Chapter](relative/path/to/markdown.md)
[Title of Suffix Chapter](relative/path/to/markdown2.md)
</code></pre>
</li>
<li>
<p><em><strong>Draft chapters</strong></em> - Draft chapters are chapters without a file and thus content.
The purpose of a draft chapter is to signal future chapters still to be written.
Or when still laying out the structure of the book to avoid creating the files
while you are still changing the structure of the book a lot.
Draft chapters will be rendered in the HTML renderer as disabled links in the table
of contents, as you can see for the next chapter in the table of contents on the left.
Draft chapters are written like normal chapters but without writing the path to the file.</p>
<pre><code class="language-markdown">- [Draft Chapter]()
</code></pre>
</li>
<li>
<p><em><strong>Separators</strong></em> - Separators can be added before, in between, and after any other element. They result
in an HTML rendered line in the built table of contents. A separator is
a line containing exclusively dashes and at least three of them: <code>---</code>.</p>
<pre><code class="language-markdown"># My Part Title
[A Prefix Chapter](relative/path/to/markdown.md)
---
- [First Chapter](relative/path/to/markdown2.md)
</code></pre>
</li>
</ol>
<h3 id="example"><a class="header" href="#example">Example</a></h3>
<p>Below is the markdown source for the <code>SUMMARY.md</code> for this guide, with the resulting table
of contents as rendered to the left.</p>
<pre><code class="language-markdown"># Summary
[Introduction](README.md)
# User Guide
- [Installation](guide/installation.md)
- [Reading Books](guide/reading.md)
- [Creating a Book](guide/creating.md)
# Reference Guide
- [Command Line Tool](cli/README.md)
- [init](cli/init.md)
- [build](cli/build.md)
- [watch](cli/watch.md)
- [serve](cli/serve.md)
- [test](cli/test.md)
- [clean](cli/clean.md)
- [completions](cli/completions.md)
- [Format](format/README.md)
- [SUMMARY.md](format/summary.md)
- [Draft chapter]()
- [Configuration](format/configuration/README.md)
- [General](format/configuration/general.md)
- [Preprocessors](format/configuration/preprocessors.md)
- [Renderers](format/configuration/renderers.md)
- [Environment Variables](format/configuration/environment-variables.md)
- [Theme](format/theme/README.md)
- [index.hbs](format/theme/index-hbs.md)
- [Syntax highlighting](format/theme/syntax-highlighting.md)
- [Editor](format/theme/editor.md)
- [MathJax Support](format/mathjax.md)
- [mdBook-specific features](format/mdbook.md)
- [Markdown](format/markdown.md)
- [Continuous Integration](continuous-integration.md)
- [For Developers](for_developers/README.md)
- [Preprocessors](for_developers/preprocessors.md)
- [Alternative Backends](for_developers/backends.md)
-----------
[Contributors](misc/contributors.md)
</code></pre>
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<p>In addition to providing runnable code playgrounds, mdBook optionally allows them
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be added to the <em><strong>book.toml</strong></em>:</p>
<pre><code class="language-toml">[output.html.playground]
editable = true
</code></pre>
<p>To make a specific block available for editing, the attribute <code>editable</code> needs
to be added to it:</p>
<pre><code class="language-markdown">```rust,editable
fn main() {
let number = 5;
print!("{}", number);
}
```
</code></pre>
<p>The above will result in this editable playground:</p>
<pre><pre class="playground"><code class="language-rust editable edition2018">fn main() {
let number = 5;
print!("{}", number);
}</code></pre></pre>
<p>Note the new <code>Undo Changes</code> button in the editable playgrounds.</p>
<h2 id="customizing-the-editor"><a class="header" href="#customizing-the-editor">Customizing the Editor</a></h2>
<p>By default, the editor is the <a href="https://ace.c9.io/">Ace</a> editor, but, if desired,
the functionality may be overridden by providing a different folder:</p>
<pre><code class="language-toml">[output.html.playground]
editable = true
editor = "/path/to/editor"
</code></pre>
<p>Note that for the editor changes to function correctly, the <code>book.js</code> inside of
the <code>theme</code> folder will need to be overridden as it has some couplings with the
default Ace editor.</p>
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<main>
<h1 id="indexhbs"><a class="header" href="#indexhbs">index.hbs</a></h1>
<p><code>index.hbs</code> is the handlebars template that is used to render the book. The
markdown files are processed to html and then injected in that template.</p>
<p>If you want to change the layout or style of your book, chances are that you
will have to modify this template a little bit. Here is what you need to know.</p>
<h2 id="data"><a class="header" href="#data">Data</a></h2>
<p>A lot of data is exposed to the handlebars template with the "context". In the
handlebars template you can access this information by using</p>
<pre><code class="language-handlebars">{{name_of_property}}
</code></pre>
<p>Here is a list of the properties that are exposed:</p>
<ul>
<li>
<p><em><strong>language</strong></em> Language of the book in the form <code>en</code>, as specified in <code>book.toml</code> (if not specified, defaults to <code>en</code>). To use in <code
class="language-html">&lt;html lang="{{ language }}"&gt;</code> for example.</p>
</li>
<li>
<p><em><strong>title</strong></em> Title used for the current page. This is identical to <code>{{ chapter_title }} - {{ book_title }}</code> unless <code>book_title</code> is not set in which case it just defaults to the <code>chapter_title</code>.</p>
</li>
<li>
<p><em><strong>book_title</strong></em> Title of the book, as specified in <code>book.toml</code></p>
</li>
<li>
<p><em><strong>chapter_title</strong></em> Title of the current chapter, as listed in <code>SUMMARY.md</code></p>
</li>
<li>
<p><em><strong>path</strong></em> Relative path to the original markdown file from the source
directory</p>
</li>
<li>
<p><em><strong>content</strong></em> This is the rendered markdown.</p>
</li>
<li>
<p><em><strong>path_to_root</strong></em> This is a path containing exclusively <code>../</code>'s that points
to the root of the book from the current file. Since the original directory
structure is maintained, it is useful to prepend relative links with this
<code>path_to_root</code>.</p>
</li>
<li>
<p><em><strong>chapters</strong></em> Is an array of dictionaries of the form</p>
<pre><code class="language-json">{"section": "1.2.1", "name": "name of this chapter", "path": "dir/markdown.md"}
</code></pre>
<p>containing all the chapters of the book. It is used for example to construct
the table of contents (sidebar).</p>
</li>
</ul>
<h2 id="handlebars-helpers"><a class="header" href="#handlebars-helpers">Handlebars Helpers</a></h2>
<p>In addition to the properties you can access, there are some handlebars helpers
at your disposal.</p>
<h3 id="1-toc"><a class="header" href="#1-toc">1. toc</a></h3>
<p>The toc helper is used like this</p>
<pre><code class="language-handlebars">{{#toc}}{{/toc}}
</code></pre>
<p>and outputs something that looks like this, depending on the structure of your
book</p>
<pre><code class="language-html">&lt;ul class="chapter"&gt;
&lt;li&gt;&lt;a href="link/to/file.html"&gt;Some chapter&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;
&lt;ul class="section"&gt;
&lt;li&gt;&lt;a href="link/to/other_file.html"&gt;Some other Chapter&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
</code></pre>
<p>If you would like to make a toc with another structure, you have access to the
chapters property containing all the data. The only limitation at the moment
is that you would have to do it with JavaScript instead of with a handlebars
helper.</p>
<pre><code class="language-html">&lt;script&gt;
var chapters = {{chapters}};
// Processing here
&lt;/script&gt;
</code></pre>
<h3 id="2-previous--next"><a class="header" href="#2-previous--next">2. previous / next</a></h3>
<p>The previous and next helpers expose a <code>link</code> and <code>name</code> property to the
previous and next chapters.</p>
<p>They are used like this</p>
<pre><code class="language-handlebars">{{#previous}}
&lt;a href="{{link}}" class="nav-chapters previous"&gt;
&lt;i class="fa fa-angle-left"&gt;&lt;/i&gt;
&lt;/a&gt;
{{/previous}}
</code></pre>
<p>The inner html will only be rendered if the previous / next chapter exists.
Of course the inner html can be changed to your liking.</p>
<hr />
<p><em>If you would like other properties or helpers exposed, please <a href="https://github.com/rust-lang/mdBook/issues">create a new
issue</a></em></p>
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<p>The default renderer uses a <a href="https://handlebarsjs.com">handlebars</a> template to
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<p>The theme is totally customizable, you can selectively replace every file from
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and now that file will be used instead of the default file.</p>
<p>Here are the files you can override:</p>
<ul>
<li><strong><em>index.hbs</em></strong> is the handlebars template.</li>
<li><strong><em>head.hbs</em></strong> is appended to the HTML <code>&lt;head&gt;</code> section.</li>
<li><strong><em>header.hbs</em></strong> content is appended on top of every book page.</li>
<li><strong><em>css/</em></strong> contains the CSS files for styling the book.
<ul>
<li><strong><em>css/chrome.css</em></strong> is for UI elements.</li>
<li><strong><em>css/general.css</em></strong> is the base styles.</li>
<li><strong><em>css/print.css</em></strong> is the style for printer output.</li>
<li><strong><em>css/variables.css</em></strong> contains variables used in other CSS files.</li>
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</li>
<li><strong><em>book.js</em></strong> is mostly used to add client side functionality, like hiding /
un-hiding the sidebar, changing the theme, ...</li>
<li><strong><em>highlight.js</em></strong> is the JavaScript that is used to highlight code snippets,
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<li><strong><em>highlight.css</em></strong> is the theme used for the code highlighting.</li>
<li><strong><em>favicon.svg</em></strong> and <strong><em>favicon.png</em></strong> the favicon that will be used. The SVG
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<li><strong>fonts/fonts.css</strong> contains the definition of which fonts to load.
Custom fonts can be included in the <code>fonts</code> directory.</li>
</ul>
<p>Generally, when you want to tweak the theme, you don't need to override all the
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into your source directory automatically by using <code>mdbook init --theme</code> and just
remove the files you don't want to override.</p>
<p><code>mdbook init --theme</code> will not create every file listed above.
Some files, such as <code>head.hbs</code>, do not have built-in equivalents.
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<p>If you completely replace all built-in themes, be sure to also set
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<h1 id="creating-a-book"><a class="header" href="#creating-a-book">Creating a Book</a></h1>
<p>Once you have the <code>mdbook</code> CLI tool installed, you can use it to create and render a book.</p>
<h2 id="initializing-a-book"><a class="header" href="#initializing-a-book">Initializing a book</a></h2>
<p>The <code>mdbook init</code> command will create a new directory containing an empty book for you to get started.
Give it the name of the directory that you want to create:</p>
<pre><code class="language-sh">mdbook init my-first-book
</code></pre>
<p>It will ask a few questions before generating the book.
After answering the questions, you can change the current directory into the new book:</p>
<pre><code class="language-sh">cd my-first-book
</code></pre>
<p>There are several ways to render a book, but one of the easiest methods is to use the <code>serve</code> command, which will build your book and start a local webserver:</p>
<pre><code class="language-sh">mdbook serve --open
</code></pre>
<p>The <code>--open</code> option will open your default web browser to view your new book.
You can leave the server running even while you edit the content of the book, and <code>mdbook</code> will automatically rebuild the output <em>and</em> automatically refresh your web browser.</p>
<p>Check out the <a href="../cli/index.html">CLI Guide</a> for more information about other <code>mdbook</code> commands and CLI options.</p>
<h2 id="anatomy-of-a-book"><a class="header" href="#anatomy-of-a-book">Anatomy of a book</a></h2>
<p>A book is built from several files which define the settings and layout of the book.</p>
<h3 id="booktoml"><a class="header" href="#booktoml"><code>book.toml</code></a></h3>
<p>In the root of your book, there is a <code>book.toml</code> file which contains settings for describing how to build your book.
This is written in the <a href="https://toml.io/">TOML markup language</a>.
The default settings are usually good enough to get you started.
When you are interested in exploring more features and options that mdBook provides, check out the <a href="../format/configuration/index.html">Configuration chapter</a> for more details.</p>
<p>A very basic <code>book.toml</code> can be as simple as this:</p>
<pre><code class="language-toml">[book]
title = "My First Book"
</code></pre>
<h3 id="summarymd"><a class="header" href="#summarymd"><code>SUMMARY.md</code></a></h3>
<p>The next major part of a book is the summary file located at <code>src/SUMMARY.md</code>.
This file contains a list of all the chapters in the book.
Before a chapter can be viewed, it must be added to this list.</p>
<p>Here's a basic summary file with a few chapters:</p>
<pre><code class="language-md"># Summary
[Introduction](README.md)
- [My First Chapter](my-first-chapter.md)
- [Nested example](nested/README.md)
- [Sub-chapter](nested/sub-chapter.md)
</code></pre>
<p>Try opening up <code>src/SUMMARY.md</code> in your editor and adding a few chapters.
If any of the chapter files do not exist, <code>mdbook</code> will automatically create them for you.</p>
<p>For more details on other formatting options for the summary file, check out the <a href="../format/summary.html">Summary chapter</a>.</p>
<h3 id="source-files"><a class="header" href="#source-files">Source files</a></h3>
<p>The content of your book is all contained in the <code>src</code> directory.
Each chapter is a separate Markdown file.
Typically, each chapter starts with a level 1 heading with the title of the chapter.</p>
<pre><code class="language-md"># My First Chapter
Fill out your content here.
</code></pre>
<p>The precise layout of the files is up to you.
The organization of the files will correspond to the HTML files generated, so keep in mind that the file layout is part of the URL of each chapter.</p>
<p>While the <code>mdbook serve</code> command is running, you can open any of the chapter files and start editing them.
Each time you save the file, <code>mdbook</code> will rebuild the book and refresh your web browser.</p>
<p>Check out the <a href="../format/markdown.html">Markdown chapter</a> for more information on formatting the content of your chapters.</p>
<p>All other files in the <code>src</code> directory will be included in the output.
So if you have images or other static files, just include them somewhere in the <code>src</code> directory.</p>
<h2 id="publishing-a-book"><a class="header" href="#publishing-a-book">Publishing a book</a></h2>
<p>Once you've written your book, you may want to host it somewhere for others to view.
The first step is to build the output of the book.
This can be done with the <code>mdbook build</code> command in the same directory where the <code>book.toml</code> file is located:</p>
<pre><code class="language-sh">mdbook build
</code></pre>
<p>This will generate a directory named <code>book</code> which contains the HTML content of your book.
You can then place this directory on any web server to host it.</p>
<p>For more information about publishing and deploying, check out the <a href="../continuous-integration.html">Continuous Integration chapter</a> for more.</p>
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<h1 id="installation"><a class="header" href="#installation">Installation</a></h1>
<p>There are multiple ways to install the mdBook CLI tool.
Choose any one of the methods below that best suit your needs.
If you are installing mdBook for automatic deployment, check out the <a href="../continuous-integration.html">continuous integration</a> chapter for more examples on how to install.</p>
<h2 id="pre-compiled-binaries"><a class="header" href="#pre-compiled-binaries">Pre-compiled binaries</a></h2>
<p>Executable binaries are available for download on the <a href="https://github.com/rust-lang/mdBook/releases">GitHub Releases page</a>.
Download the binary for your platform (Windows, macOS, or Linux) and extract the archive.
The archive contains an <code>mdbook</code> executable which you can run to build your books.</p>
<p>To make it easier to run, put the path to the binary into your <code>PATH</code>.</p>
<h2 id="build-from-source-using-rust"><a class="header" href="#build-from-source-using-rust">Build from source using Rust</a></h2>
<p>To build the <code>mdbook</code> executable from source, you will first need to install Rust and Cargo.
Follow the instructions on the <a href="https://www.rust-lang.org/tools/install">Rust installation page</a>.
mdBook currently requires at least Rust version 1.71.</p>
<p>Once you have installed Rust, the following command can be used to build and install mdBook:</p>
<pre><code class="language-sh">cargo install mdbook
</code></pre>
<p>This will automatically download mdBook from <a href="https://crates.io/">crates.io</a>, build it, and install it in Cargo's global binary directory (<code>~/.cargo/bin/</code> by default).</p>
<p>To uninstall, run the command <code>cargo uninstall mdbook</code>.</p>
<h3 id="installing-the-latest-master-version"><a class="header" href="#installing-the-latest-master-version">Installing the latest master version</a></h3>
<p>The version published to crates.io will ever so slightly be behind the version hosted on GitHub.
If you need the latest version you can build the git version of mdBook yourself.
Cargo makes this <em><strong>super easy</strong></em>!</p>
<pre><code class="language-sh">cargo install --git https://github.com/rust-lang/mdBook.git mdbook
</code></pre>
<p>Again, make sure to add the Cargo bin directory to your <code>PATH</code>.</p>
<p>If you are interested in making modifications to mdBook itself, check out the <a href="https://github.com/rust-lang/mdBook/blob/master/CONTRIBUTING.md">Contributing Guide</a> for more information.</p>
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<h1 id="reading-books"><a class="header" href="#reading-books">Reading Books</a></h1>
<p>This chapter gives an introduction on how to interact with a book produced by mdBook.
This assumes you are reading an HTML book.
The options and formatting will be different for other output formats such as PDF.</p>
<p>A book is organized into <em>chapters</em>.
Each chapter is a separate page.
Chapters can be nested into a hierarchy of sub-chapters.
Typically, each chapter will be organized into a series of <em>headings</em> to subdivide a chapter.</p>
<h2 id="navigation"><a class="header" href="#navigation">Navigation</a></h2>
<p>There are several methods for navigating through the chapters of a book.</p>
<p>The <strong>sidebar</strong> on the left provides a list of all chapters.
Clicking on any of the chapter titles will load that page.</p>
<p>The sidebar may not automatically appear if the window is too narrow, particularly on mobile displays.
In that situation, the menu icon (three horizontal bars) at the top-left of the page can be pressed to open and close the sidebar.</p>
<p>The <strong>arrow buttons</strong> at the bottom of the page can be used to navigate to the previous or the next chapter.</p>
<p>The <strong>left and right arrow keys</strong> on the keyboard can be used to navigate to the previous or the next chapter.</p>
<h2 id="top-menu-bar"><a class="header" href="#top-menu-bar">Top menu bar</a></h2>
<p>The menu bar at the top of the page provides some icons for interacting with the book.
The icons displayed will depend on the settings of how the book was generated.</p>
<div class="table-wrapper"><table><thead><tr><th>Icon</th><th>Description</th></tr></thead><tbody>
<tr><td><i class="fa fa-bars"></i></td><td>Opens and closes the chapter listing sidebar.</td></tr>
<tr><td><i class="fa fa-paint-brush"></i></td><td>Opens a picker to choose a different color theme.</td></tr>
<tr><td><i class="fa fa-search"></i></td><td>Opens a search bar for searching within the book.</td></tr>
<tr><td><i class="fa fa-print"></i></td><td>Instructs the web browser to print the entire book.</td></tr>
<tr><td><i class="fa fa-github"></i></td><td>Opens a link to the website that hosts the source code of the book.</td></tr>
<tr><td><i class="fa fa-edit"></i></td><td>Opens a page to directly edit the source of the page you are currently reading.</td></tr>
</tbody></table>
</div>
<p>Tapping the menu bar will scroll the page to the top.</p>
<h2 id="search"><a class="header" href="#search">Search</a></h2>
<p>Each book has a built-in search system.
Pressing the search icon (<i class="fa fa-search"></i>) in the menu bar, or pressing the <code>S</code> key on the keyboard will open an input box for entering search terms.
Typing some terms will show matching chapters and sections in real time.</p>
<p>Clicking any of the results will jump to that section.
The up and down arrow keys can be used to navigate the results, and enter will open the highlighted section.</p>
<p>After loading a search result, the matching search terms will be highlighted in the text.
Clicking a highlighted word or pressing the <code>Esc</code> key will remove the highlighting.</p>
<h2 id="code-blocks"><a class="header" href="#code-blocks">Code blocks</a></h2>
<p>mdBook books are often used for programming projects, and thus support highlighting code blocks and samples.
Code blocks may contain several different icons for interacting with them:</p>
<div class="table-wrapper"><table><thead><tr><th>Icon</th><th>Description</th></tr></thead><tbody>
<tr><td><i class="fa fa-copy"></i></td><td>Copies the code block into your local clipboard, to allow pasting into another application.</td></tr>
<tr><td><i class="fa fa-play"></i></td><td>For Rust code examples, this will execute the sample code and display the compiler output just below the example (see <a href="../format/mdbook.html#rust-playground">playground</a>).</td></tr>
<tr><td><i class="fa fa-eye"></i></td><td>For Rust code examples, this will toggle visibility of "hidden" lines. Sometimes, larger examples will hide lines which are not particularly relevant to what is being illustrated (see <a href="../format/mdbook.html#hiding-code-lines">hiding code lines</a>).</td></tr>
<tr><td><i class="fa fa-history"></i></td><td>For <a href="../format/theme/editor.html">editable code examples</a>, this will undo any changes you have made.</td></tr>
</tbody></table>
</div>
<p>Here's an example:</p>
<pre><pre class="playground"><code class="language-rust edition2018"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>println!("Hello, World!");
<span class="boring">}</span></code></pre></pre>
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# Document not found (404)
This URL is invalid, sorry. Try the search instead!

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# Introduction
**mdBook** is a command line tool to create books with Markdown.
It is ideal for creating product or API documentation, tutorials, course materials or anything that requires a clean,
easily navigable and customizable presentation.
* Lightweight [Markdown] syntax helps you focus more on your content
* Integrated [search] support
* Color [syntax highlighting] for code blocks for many different languages
* [Theme] files allow customizing the formatting of the output
* [Preprocessors] can provide extensions for custom syntax and modifying content
* [Backends] can render the output to multiple formats
* Written in [Rust] for speed, safety, and simplicity
* Automated testing of [Rust code samples]
This guide is an example of what mdBook produces.
mdBook is used by the Rust programming language project, and [The Rust Programming Language][trpl] book is another fine example of mdBook in action.
[Markdown]: format/markdown.md
[search]: guide/reading.md#search
[syntax highlighting]: format/theme/syntax-highlighting.md
[theme]: format/theme/index.html
[preprocessors]: format/configuration/preprocessors.md
[backends]: format/configuration/renderers.md
[Rust]: https://www.rust-lang.org/
[trpl]: https://doc.rust-lang.org/book/
[Rust code samples]: cli/test.md
## Contributing
mdBook is free and open source. You can find the source code on
[GitHub](https://github.com/rust-lang/mdBook) and issues and feature requests can be posted on
the [GitHub issue tracker](https://github.com/rust-lang/mdBook/issues). mdBook relies on the community to fix bugs and
add features: if you'd like to contribute, please read
the [CONTRIBUTING](https://github.com/rust-lang/mdBook/blob/master/CONTRIBUTING.md) guide and consider opening
a [pull request](https://github.com/rust-lang/mdBook/pulls).
## License
The mdBook source and documentation are released under
the [Mozilla Public License v2.0](https://www.mozilla.org/MPL/2.0/).

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# Summary
[Introduction](README.md)
# User Guide
- [Installation](guide/installation.md)
- [Reading Books](guide/reading.md)
- [Creating a Book](guide/creating.md)
# Reference Guide
- [Command Line Tool](cli/README.md)
- [init](cli/init.md)
- [build](cli/build.md)
- [watch](cli/watch.md)
- [serve](cli/serve.md)
- [test](cli/test.md)
- [clean](cli/clean.md)
- [completions](cli/completions.md)
- [Format](format/README.md)
- [SUMMARY.md](format/summary.md)
- [Draft chapter]()
- [Configuration](format/configuration/README.md)
- [General](format/configuration/general.md)
- [Preprocessors](format/configuration/preprocessors.md)
- [Renderers](format/configuration/renderers.md)
- [Environment Variables](format/configuration/environment-variables.md)
- [Theme](format/theme/README.md)
- [index.hbs](format/theme/index-hbs.md)
- [Syntax highlighting](format/theme/syntax-highlighting.md)
- [Editor](format/theme/editor.md)
- [MathJax Support](format/mathjax.md)
- [mdBook-specific features](format/mdbook.md)
- [Markdown](format/markdown.md)
- [Continuous Integration](continuous-integration.md)
- [For Developers](for_developers/README.md)
- [Preprocessors](for_developers/preprocessors.md)
- [Alternative Backends](for_developers/backends.md)
-----------
[Contributors](misc/contributors.md)

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# Command Line Tool
The `mdbook` command-line tool is used to create and build books.
After you have [installed](../guide/installation.md) `mdbook`, you can run the `mdbook help` command in your terminal to view the available commands.
This following sections provide in-depth information on the different commands available.
* [`mdbook init <directory>`](init.md) — Creates a new book with minimal boilerplate to start with.
* [`mdbook build`](build.md) — Renders the book.
* [`mdbook watch`](watch.md) — Rebuilds the book any time a source file changes.
* [`mdbook serve`](serve.md) — Runs a web server to view the book, and rebuilds on changes.
* [`mdbook test`](test.md) — Tests Rust code samples.
* [`mdbook clean`](clean.md) — Deletes the rendered output.
* [`mdbook completions`](completions.md) — Support for shell auto-completion.

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# The build command
The build command is used to render your book:
```bash
mdbook build
```
It will try to parse your `SUMMARY.md` file to understand the structure of your
book and fetch the corresponding files. Note that this will also create files
mentioned in `SUMMARY.md` which are not yet present.
The rendered output will maintain the same directory structure as the source for
convenience. Large books will therefore remain structured when rendered.
#### Specify a directory
The `build` command can take a directory as an argument to use as the book's
root instead of the current working directory.
```bash
mdbook build path/to/book
```
#### --open
When you use the `--open` (`-o`) flag, mdbook will open the rendered book in
your default web browser after building it.
#### --dest-dir
The `--dest-dir` (`-d`) option allows you to change the output directory for the
book. Relative paths are interpreted relative to the book's root directory. If
not specified it will default to the value of the `build.build-dir` key in
`book.toml`, or to `./book`.
-------------------
***Note:*** *The build command copies all files (excluding files with `.md` extension) from the source directory
into the build directory.*

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# The clean command
The clean command is used to delete the generated book and any other build
artifacts.
```bash
mdbook clean
```
#### Specify a directory
The `clean` command can take a directory as an argument to use as the book's
root instead of the current working directory.
```bash
mdbook clean path/to/book
```
#### --dest-dir
The `--dest-dir` (`-d`) option allows you to override the book's output
directory, which will be deleted by this command. Relative paths are interpreted
relative to the book's root directory. If not specified it will default to the
value of the `build.build-dir` key in `book.toml`, or to `./book`.
```bash
mdbook clean --dest-dir=path/to/book
```
`path/to/book` could be absolute or relative.

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# The completions command
The completions command is used to generate auto-completions for some common shells.
This means when you type `mdbook` in your shell, you can then press your shell's auto-complete key (usually the Tab key) and it may display what the valid options are, or finish partial input.
The completions first need to be installed for your shell:
```bash
# bash
mdbook completions bash > ~/.local/share/bash-completion/completions/mdbook
# oh-my-zsh
mdbook completions zsh > ~/.oh-my-zsh/completions/_mdbook
autoload -U compinit && compinit
```
The command prints a completion script for the given shell.
Run `mdbook completions --help` for a list of supported shells.
Where to place the completions depend on which shell you are using and your operating system.
Consult your shell's documentation for more information one where to place the script.

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# The init command
There is some minimal boilerplate that is the same for every new book. It's for
this purpose that mdBook includes an `init` command.
The `init` command is used like this:
```bash
mdbook init
```
When using the `init` command for the first time, a couple of files will be set
up for you:
```bash
book-test/
├── book
└── src
├── chapter_1.md
└── SUMMARY.md
```
- The `src` directory is where you write your book in markdown. It contains all
the source files, configuration files, etc.
- The `book` directory is where your book is rendered. All the output is ready
to be uploaded to a server to be seen by your audience.
- The `SUMMARY.md` is the skeleton of your
book, and is discussed in more detail [in another
chapter](../format/summary.md).
#### Tip: Generate chapters from SUMMARY.md
When a `SUMMARY.md` file already exists, the `init` command will first parse it
and generate the missing files according to the paths used in the `SUMMARY.md`.
This allows you to think and create the whole structure of your book and then
let mdBook generate it for you.
#### Specify a directory
The `init` command can take a directory as an argument to use as the book's root
instead of the current working directory.
```bash
mdbook init path/to/book
```
#### --theme
When you use the `--theme` flag, the default theme will be copied into a
directory called `theme` in your source directory so that you can modify it.
The theme is selectively overwritten, this means that if you don't want to
overwrite a specific file, just delete it and the default file will be used.
#### --title
Specify a title for the book. If not supplied, an interactive prompt will ask for
a title.
```bash
mdbook init --title="my amazing book"
```
#### --ignore
Create a `.gitignore` file configured to ignore the `book` directory created when [building] a book.
If not supplied, an interactive prompt will ask whether it should be created.
```bash
mdbook init --ignore=none
```
```bash
mdbook init --ignore=git
```
[building]: build.md
#### --force
Skip the prompts to create a `.gitignore` and for the title for the book.

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# The serve command
The serve command is used to preview a book by serving it via HTTP at
`localhost:3000` by default:
```bash
mdbook serve
```
The `serve` command watches the book's `src` directory for
changes, rebuilding the book and refreshing clients for each change; this includes
re-creating deleted files still mentioned in `SUMMARY.md`! A websocket
connection is used to trigger the client-side refresh.
***Note:*** *The `serve` command is for testing a book's HTML output, and is not
intended to be a complete HTTP server for a website.*
#### Specify a directory
The `serve` command can take a directory as an argument to use as the book's
root instead of the current working directory.
```bash
mdbook serve path/to/book
```
### Server options
The `serve` hostname defaults to `localhost`, and the port defaults to `3000`. Either option can be specified on the command line:
```bash
mdbook serve path/to/book -p 8000 -n 127.0.0.1
```
#### --open
When you use the `--open` (`-o`) flag, mdbook will open the book in your
default web browser after starting the server.
#### --dest-dir
The `--dest-dir` (`-d`) option allows you to change the output directory for the
book. Relative paths are interpreted relative to the book's root directory. If
not specified it will default to the value of the `build.build-dir` key in
`book.toml`, or to `./book`.
#### Specify exclude patterns
The `serve` command will not automatically trigger a build for files listed in
the `.gitignore` file in the book root directory. The `.gitignore` file may
contain file patterns described in the [gitignore
documentation](https://git-scm.com/docs/gitignore). This can be useful for
ignoring temporary files created by some editors.
***Note:*** *Only the `.gitignore` from the book root directory is used. Global
`$HOME/.gitignore` or `.gitignore` files in parent directories are not used.*

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# The test command
When writing a book, you sometimes need to automate some tests. For example,
[The Rust Programming Book](https://doc.rust-lang.org/stable/book/) uses a lot
of code examples that could get outdated. Therefore it is very important for
them to be able to automatically test these code examples.
mdBook supports a `test` command that will run all available tests in a book. At
the moment, only Rust tests are supported.
#### Disable tests on a code block
rustdoc doesn't test code blocks which contain the `ignore` attribute:
```rust,ignore
fn main() {}
```
rustdoc also doesn't test code blocks which specify a language other than Rust:
```markdown
**Foo**: _bar_
```
rustdoc *does* test code blocks which have no language specified:
```
This is going to cause an error!
```
#### Specify a directory
The `test` command can take a directory as an argument to use as the book's root
instead of the current working directory.
```bash
mdbook test path/to/book
```
#### --library-path
The `--library-path` (`-L`) option allows you to add directories to the library
search path used by `rustdoc` when it builds and tests the examples. Multiple
directories can be specified with multiple options (`-L foo -L bar`) or with a
comma-delimited list (`-L foo,bar`). The path should point to the Cargo
[build cache](https://doc.rust-lang.org/cargo/guide/build-cache.html) `deps` directory that
contains the build output of your project. For example, if your Rust project's book is in a directory
named `my-book`, the following command would include the crate's dependencies when running `test`:
```shell
mdbook test my-book -L target/debug/deps/
```
See the `rustdoc` command-line [documentation](https://doc.rust-lang.org/rustdoc/command-line-arguments.html#-l--library-path-where-to-look-for-dependencies)
for more information.
#### --dest-dir
The `--dest-dir` (`-d`) option allows you to change the output directory for the
book. Relative paths are interpreted relative to the book's root directory. If
not specified it will default to the value of the `build.build-dir` key in
`book.toml`, or to `./book`.
#### --chapter
The `--chapter` (`-c`) option allows you to test a specific chapter of the
book using the chapter name or the relative path to the chapter.

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# The watch command
The `watch` command is useful when you want your book to be rendered on every
file change. You could repeatedly issue `mdbook build` every time a file is
changed. But using `mdbook watch` once will watch your files and will trigger a
build automatically whenever you modify a file; this includes re-creating
deleted files still mentioned in `SUMMARY.md`!
#### Specify a directory
The `watch` command can take a directory as an argument to use as the book's
root instead of the current working directory.
```bash
mdbook watch path/to/book
```
#### --open
When you use the `--open` (`-o`) option, mdbook will open the rendered book in
your default web browser.
#### --dest-dir
The `--dest-dir` (`-d`) option allows you to change the output directory for the
book. Relative paths are interpreted relative to the book's root directory. If
not specified it will default to the value of the `build.build-dir` key in
`book.toml`, or to `./book`.
#### Specify exclude patterns
The `watch` command will not automatically trigger a build for files listed in
the `.gitignore` file in the book root directory. The `.gitignore` file may
contain file patterns described in the [gitignore
documentation](https://git-scm.com/docs/gitignore). This can be useful for
ignoring temporary files created by some editors.
_Note: Only `.gitignore` from book root directory is used. Global
`$HOME/.gitignore` or `.gitignore` files in parent directories are not used._

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# Running `mdbook` in Continuous Integration
There are a variety of services such as [GitHub Actions] or [GitLab CI/CD] which can be used to test and deploy your book automatically.
The following provides some general guidelines on how to configure your service to run mdBook.
Specific recipes can be found at the [Automated Deployment] wiki page.
[GitHub Actions]: https://docs.github.com/en/actions
[GitLab CI/CD]: https://docs.gitlab.com/ee/ci/
[Automated Deployment]: https://github.com/rust-lang/mdBook/wiki/Automated-Deployment
## Installing mdBook
There are several different strategies for installing mdBook.
The particular method depends on your needs and preferences.
### Pre-compiled binaries
Perhaps the easiest method is to use the pre-compiled binaries found on the [GitHub Releases page][releases].
A simple approach would be to use the popular `curl` CLI tool to download the executable:
```sh
mkdir bin
curl -sSL https://github.com/rust-lang/mdBook/releases/download/v0.4.37/mdbook-v0.4.37-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=bin
bin/mdbook build
```
Some considerations for this approach:
* This is relatively fast, and does not necessarily require dealing with caching.
* This does not require installing Rust.
* Specifying a specific URL means you have to manually update your script to get a new version.
This may be a benefit if you want to lock to a specific version.
However, some users prefer to automatically get a newer version when they are published.
* You are reliant on the GitHub CDN being available.
[releases]: https://github.com/rust-lang/mdBook/releases
### Building from source
Building from source will require having Rust installed.
Some services have Rust pre-installed, but if your service does not, you will need to add a step to install it.
After Rust is installed, `cargo install` can be used to build and install mdBook.
We recommend using a SemVer version specifier so that you get the latest **non-breaking** version of mdBook.
For example:
```sh
cargo install mdbook --no-default-features --features search --vers "^0.4" --locked
```
This includes several recommended options:
* `--no-default-features` — Disables features like the HTTP server used by `mdbook serve` that is likely not needed on CI.
This will speed up the build time significantly.
* `--features search` — Disabling default features means you should then manually enable features that you want, such as the built-in [search] capability.
* `--vers "^0.4"` — This will install the most recent version of the `0.4` series.
However, versions after like `0.5.0` won't be installed, as they may break your build.
Cargo will automatically upgrade mdBook if you have an older version already installed.
* `--locked` — This will use the dependencies that were used when mdBook was released.
Without `--locked`, it will use the latest version of all dependencies, which may include some fixes since the last release, but may also (rarely) cause build problems.
You will likely want to investigate caching options, as building mdBook can be somewhat slow.
[search]: guide/reading.md#search
## Running tests
You may want to run tests using [`mdbook test`] every time you push a change or create a pull request.
This can be used to validate Rust code examples in the book.
This will require having Rust installed.
Some services have Rust pre-installed, but if your service does not, you will need to add a step to install it.
Other than making sure the appropriate version of Rust is installed, there's not much more than just running `mdbook test` from the book directory.
You may also want to consider running other kinds of tests, like [mdbook-linkcheck] which will check for broken links.
Or if you have your own style checks, spell checker, or any other tests it might be good to run them in CI.
[`mdbook test`]: cli/test.md
[mdbook-linkcheck]: https://github.com/Michael-F-Bryan/mdbook-linkcheck#continuous-integration
## Deploying
You may want to automatically deploy your book.
Some may want to do this every time a change is pushed, and others may want to only deploy when a specific release is tagged.
You'll also need to understand the specifics on how to push a change to your web service.
For example, [GitHub Pages] just requires committing the output onto a specific git branch.
Other services may require using something like SSH to connect to a remote server.
The basic outline is that you need to run `mdbook build` to generate the output, and then transfer the files (which are in the `book` directory) to the correct location.
You may then want to consider if you need to invalidate any caches on your web service.
See the [Automated Deployment] wiki page for examples of various different services.
[GitHub Pages]: https://docs.github.com/en/pages
### 404 handling
mdBook automatically generates a 404 page to be used for broken links.
The default output is a file named `404.html` at the root of the book.
Some services like [GitHub Pages] will automatically use this page for broken links.
For other services, you may want to consider configuring the web server to use this page as it will provide the reader navigation to get back to the book.
If your book is not deployed at the root of the domain, then you should set the [`output.html.site-url`] setting so that the 404 page works correctly.
It needs to know where the book is deployed in order to load the static files (like CSS) correctly.
For example, this guide is deployed at <https://rust-lang.github.io/mdBook/>, and the `site-url` setting is configured like this:
```toml
# book.toml
[output.html]
site-url = "/mdBook/"
```
You can customize the look of the 404 page by creating a file named `src/404.md` in your book.
If you want to use a different filename, you can set [`output.html.input-404`] to a different filename.
[`output.html.site-url`]: format/configuration/renderers.md#html-renderer-options
[`output.html.input-404`]: format/configuration/renderers.md#html-renderer-options

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# For Developers
While `mdbook` is mainly used as a command line tool, you can also import the
underlying library directly and use that to manage a book. It also has a fairly
flexible plugin mechanism, allowing you to create your own custom tooling and
consumers (often referred to as *backends*) if you need to do some analysis of
the book or render it in a different format.
The *For Developers* chapters are here to show you the more advanced usage of
`mdbook`.
The two main ways a developer can hook into the book's build process is via,
- [Preprocessors](preprocessors.md)
- [Alternative Backends](backends.md)
## The Build Process
The process of rendering a book project goes through several steps.
1. Load the book
- Parse the `book.toml`, falling back to the default `Config` if it doesn't
exist
- Load the book chapters into memory
- Discover which preprocessors/backends should be used
2. For each backend:
1. Run all the preprocessors.
2. Call the backend to render the processed result.
## Using `mdbook` as a Library
The `mdbook` binary is just a wrapper around the `mdbook` crate, exposing its
functionality as a command-line program. As such it is quite easy to create your
own programs which use `mdbook` internally, adding your own functionality (e.g.
a custom preprocessor) or tweaking the build process.
The easiest way to find out how to use the `mdbook` crate is by looking at the
[API Docs]. The top level documentation explains how one would use the
[`MDBook`] type to load and build a book, while the [config] module gives a good
explanation on the configuration system.
[`MDBook`]: https://docs.rs/mdbook/*/mdbook/book/struct.MDBook.html
[API Docs]: https://docs.rs/mdbook/*/mdbook/
[config]: https://docs.rs/mdbook/*/mdbook/config/index.html

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