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# Configuration
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2016-12-23 16:17:04 +08:00
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You can configure the parameters for your book in the ***book.toml*** file.
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2015-08-03 20:23:32 +08:00
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2016-12-23 16:17:04 +08:00
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Here is an example of what a ***book.toml*** file might look like:
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```toml
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[book]
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title = "Example book"
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author = "John Doe"
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description = "The example book covers examples."
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[output.html]
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destination = "my-example-book"
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additional-css = ["custom.css"]
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```
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## Supported configuration options
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It is important to note that **any** relative path specified in the in the configuration will
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always be taken relative from the root of the book where the configuration file is located.
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2017-11-12 03:35:10 +08:00
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### General metadata
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2017-11-12 03:35:10 +08:00
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This is general information about your book.
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- **title:** The title of the book
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- **authors:** The author(s) of the book
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- **description:** A description for the book, which is added as meta
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information in the html `<head>` of each page
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- **src:** By default, the source directory is found in the directory named
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`src` directly under the root folder. But this is configurable with the `src`
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key in the configuration file.
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- **build-dir:** The directory to put the rendered book in. By default this is
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`book/` in the book's root directory.
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**book.toml**
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```toml
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[book]
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title = "Example book"
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authors = ["John Doe", "Jane Doe"]
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description = "The example book covers examples."
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src = "my-src" # the source files will be found in `root/my-src` instead of `root/src`
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build-dir = "build"
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```
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2017-05-20 21:03:10 +08:00
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### HTML renderer options
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The HTML renderer has a couple of options as well. All the options for the
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renderer need to be specified under the TOML table `[output.html]`.
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2017-05-20 21:03:10 +08:00
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The following configuration options are available:
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2017-11-12 03:35:10 +08:00
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pub playpen: Playpen,
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- **theme:** mdBook comes with a default theme and all the resource files
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needed for it. But if this option is set, mdBook will selectively overwrite
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the theme files with the ones found in the specified folder.
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- **curly-quotes:** Convert straight quotes to curly quotes, except for
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those that occur in code blocks and code spans. Defaults to `false`.
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- **google-analytics:** If you use Google Analytics, this option lets you
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enable it by simply specifying your ID in the configuration file.
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- **additional-css:** If you need to slightly change the appearance of your
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book without overwriting the whole style, you can specify a set of
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stylesheets that will be loaded after the default ones where you can
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surgically change the style.
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- **additional-js:** If you need to add some behaviour to your book without
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removing the current behaviour, you can specify a set of javascript files
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that will be loaded alongside the default one.
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- **playpen:** A subtable for configuring various playpen settings.
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2016-12-07 22:22:32 +08:00
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2017-05-20 21:03:10 +08:00
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**book.toml**
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```toml
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[book]
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title = "Example book"
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authors = ["John Doe", "Jane Doe"]
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description = "The example book covers examples."
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[output.html]
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theme = "my-theme"
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curly-quotes = true
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google-analytics = "123456"
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additional-css = ["custom.css", "custom2.css"]
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additional-js = ["custom.js"]
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[output.html.playpen]
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editor = "./path/to/editor"
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editable = false
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```
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2015-08-06 21:24:34 +08:00
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2017-11-12 03:35:10 +08:00
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## For Developers
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If you are developing a plugin or alternate backend then whenever your code is
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called you will almost certainly be passed a reference to the book's `Config`.
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This can be treated roughly as a nested hashmap which lets you call methods like
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`get()` and `get_mut()` to get access to the config's contents.
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By convention, plugin developers will have their settings as a subtable inside
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`plugins` (e.g. a link checker would put its settings in `plugins.link_check`)
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and backends should put their configuration under `output`, like the HTML
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renderer does in the previous examples.
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As an example, some hypothetical `random` renderer would typically want to load
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its settings from the `Config` at the very start of its rendering process. The
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author can take advantage of serde to deserialize the generic `toml::Value`
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object retrieved from `Config` into a struct specific to its use case.
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```rust
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#[derive(Debug, Deserialize, PartialEq)]
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struct RandomOutput {
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foo: u32,
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bar: String,
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baz: Vec<bool>,
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}
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let src = r#"
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[output.random]
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foo = 5
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bar = "Hello World"
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baz = [true, true, false]
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"#;
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let book_config = Config::from_str(src)?; // usually passed in by mdbook
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let random: Value = book_config.get("output.random").unwrap_or_default();
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let got: RandomOutput = random.try_into()?;
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assert_eq!(got, should_be);
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if let Some(baz) = book_config.get_deserialized::<Vec<bool>>("output.random.baz") {
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println!("{:?}", baz); // prints [true, true, false]
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// do something interesting with baz
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}
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// start the rendering process
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```
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