471 lines
15 KiB
Rust
471 lines
15 KiB
Rust
//! The internal representation of a book and infrastructure for loading it from
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//! disk and building it.
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//!
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//! For examples on using `MDBook`, consult the [top-level documentation][1].
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//!
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//! [1]: ../index.html
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mod book;
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mod init;
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mod summary;
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pub use self::book::{load_book, Book, BookItem, BookItems, Chapter};
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pub use self::init::BookBuilder;
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pub use self::summary::{parse_summary, Link, SectionNumber, Summary, SummaryItem};
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use std::io::Write;
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use std::path::PathBuf;
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use std::process::Command;
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use tempfile::Builder as TempFileBuilder;
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use toml::Value;
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use errors::*;
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use preprocess::{IndexPreprocessor, LinkPreprocessor, Preprocessor, PreprocessorContext};
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use renderer::{CmdRenderer, HtmlHandlebars, RenderContext, Renderer};
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use utils;
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use config::Config;
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/// The object used to manage and build a book.
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pub struct MDBook {
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/// The book's root directory.
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pub root: PathBuf,
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/// The configuration used to tweak now a book is built.
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pub config: Config,
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/// A representation of the book's contents in memory.
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pub book: Book,
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renderers: Vec<Box<Renderer>>,
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/// List of pre-processors to be run on the book
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preprocessors: Vec<Box<Preprocessor>>,
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}
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impl MDBook {
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/// Load a book from its root directory on disk.
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pub fn load<P: Into<PathBuf>>(book_root: P) -> Result<MDBook> {
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let book_root = book_root.into();
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let config_location = book_root.join("book.toml");
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// the book.json file is no longer used, so we should emit a warning to
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// let people know to migrate to book.toml
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if book_root.join("book.json").exists() {
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warn!("It appears you are still using book.json for configuration.");
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warn!("This format is no longer used, so you should migrate to the");
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warn!("book.toml format.");
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warn!("Check the user guide for migration information:");
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warn!("\thttps://rust-lang-nursery.github.io/mdBook/format/config.html");
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}
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let mut config = if config_location.exists() {
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debug!("Loading config from {}", config_location.display());
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Config::from_disk(&config_location)?
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} else {
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Config::default()
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};
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config.update_from_env();
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if log_enabled!(::log::Level::Trace) {
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for line in format!("Config: {:#?}", config).lines() {
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trace!("{}", line);
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}
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}
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MDBook::load_with_config(book_root, config)
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}
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/// Load a book from its root directory using a custom config.
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pub fn load_with_config<P: Into<PathBuf>>(book_root: P, config: Config) -> Result<MDBook> {
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let root = book_root.into();
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let src_dir = root.join(&config.book.src);
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let book = book::load_book(&src_dir, &config.build)?;
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let renderers = determine_renderers(&config);
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let preprocessors = determine_preprocessors(&config)?;
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Ok(MDBook {
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root,
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config,
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book,
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renderers,
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preprocessors,
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})
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}
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/// Returns a flat depth-first iterator over the elements of the book,
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/// it returns an [BookItem enum](bookitem.html):
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/// `(section: String, bookitem: &BookItem)`
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///
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/// ```no_run
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/// # extern crate mdbook;
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/// # use mdbook::MDBook;
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/// # use mdbook::book::BookItem;
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/// # #[allow(unused_variables)]
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/// # fn main() {
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/// # let book = MDBook::load("mybook").unwrap();
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/// for item in book.iter() {
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/// match *item {
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/// BookItem::Chapter(ref chapter) => {},
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/// BookItem::Separator => {},
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/// }
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/// }
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///
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/// // would print something like this:
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/// // 1. Chapter 1
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/// // 1.1 Sub Chapter
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/// // 1.2 Sub Chapter
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/// // 2. Chapter 2
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/// //
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/// // etc.
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/// # }
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/// ```
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pub fn iter(&self) -> BookItems {
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self.book.iter()
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}
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/// `init()` gives you a `BookBuilder` which you can use to setup a new book
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/// and its accompanying directory structure.
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///
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/// The `BookBuilder` creates some boilerplate files and directories to get
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/// you started with your book.
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///
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/// ```text
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/// book-test/
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/// ├── book
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/// └── src
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/// ├── chapter_1.md
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/// └── SUMMARY.md
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/// ```
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///
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/// It uses the path provided as the root directory for your book, then adds
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/// in a `src/` directory containing a `SUMMARY.md` and `chapter_1.md` file
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/// to get you started.
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pub fn init<P: Into<PathBuf>>(book_root: P) -> BookBuilder {
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BookBuilder::new(book_root)
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}
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/// Tells the renderer to build our book and put it in the build directory.
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pub fn build(&self) -> Result<()> {
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info!("Book building has started");
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let mut preprocessed_book = self.book.clone();
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let preprocess_ctx = PreprocessorContext::new(self.root.clone(), self.config.clone());
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for preprocessor in &self.preprocessors {
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debug!("Running the {} preprocessor.", preprocessor.name());
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preprocessor.run(&preprocess_ctx, &mut preprocessed_book)?;
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}
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for renderer in &self.renderers {
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info!("Running the {} backend", renderer.name());
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self.run_renderer(&preprocessed_book, renderer.as_ref())?;
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}
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Ok(())
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}
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fn run_renderer(&self, preprocessed_book: &Book, renderer: &Renderer) -> Result<()> {
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let name = renderer.name();
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let build_dir = self.build_dir_for(name);
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if build_dir.exists() {
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debug!(
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"Cleaning build dir for the \"{}\" renderer ({})",
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name,
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build_dir.display()
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);
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utils::fs::remove_dir_content(&build_dir)
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.chain_err(|| "Unable to clear output directory")?;
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}
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let render_context = RenderContext::new(
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self.root.clone(),
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preprocessed_book.clone(),
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self.config.clone(),
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build_dir,
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);
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renderer
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.render(&render_context)
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.chain_err(|| "Rendering failed")
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}
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/// You can change the default renderer to another one by using this method.
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/// The only requirement is for your renderer to implement the [`Renderer`
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/// trait](../renderer/trait.Renderer.html)
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pub fn with_renderer<R: Renderer + 'static>(&mut self, renderer: R) -> &mut Self {
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self.renderers.push(Box::new(renderer));
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self
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}
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/// Register a [`Preprocessor`](../preprocess/trait.Preprocessor.html) to be used when rendering the book.
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pub fn with_preprecessor<P: Preprocessor + 'static>(&mut self, preprocessor: P) -> &mut Self {
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self.preprocessors.push(Box::new(preprocessor));
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self
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}
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/// Run `rustdoc` tests on the book, linking against the provided libraries.
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pub fn test(&mut self, library_paths: Vec<&str>) -> Result<()> {
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let library_args: Vec<&str> = (0..library_paths.len())
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.map(|_| "-L")
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.zip(library_paths.into_iter())
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.flat_map(|x| vec![x.0, x.1])
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.collect();
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let temp_dir = TempFileBuilder::new().prefix("mdbook").tempdir()?;
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let preprocess_context = PreprocessorContext::new(self.root.clone(), self.config.clone());
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LinkPreprocessor::new().run(&preprocess_context, &mut self.book)?;
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IndexPreprocessor::new().run(&preprocess_context, &mut self.book)?;
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for item in self.iter() {
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if let BookItem::Chapter(ref ch) = *item {
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if !ch.path.as_os_str().is_empty() {
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let path = self.source_dir().join(&ch.path);
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let content = utils::fs::file_to_string(&path)?;
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info!("Testing file: {:?}", path);
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// write preprocessed file to tempdir
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let path = temp_dir.path().join(&ch.path);
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let mut tmpf = utils::fs::create_file(&path)?;
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tmpf.write_all(content.as_bytes())?;
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let output = Command::new("rustdoc")
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.arg(&path)
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.arg("--test")
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.args(&library_args)
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.output()?;
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if !output.status.success() {
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bail!(ErrorKind::Subprocess(
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"Rustdoc returned an error".to_string(),
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output
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));
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}
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}
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}
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}
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Ok(())
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}
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/// The logic for determining where a backend should put its build
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/// artefacts.
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///
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/// If there is only 1 renderer, put it in the directory pointed to by the
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/// `build.build_dir` key in `Config`. If there is more than one then the
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/// renderer gets its own directory within the main build dir.
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///
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/// i.e. If there were only one renderer (in this case, the HTML renderer):
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///
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/// - build/
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/// - index.html
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/// - ...
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///
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/// Otherwise if there are multiple:
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///
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/// - build/
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/// - epub/
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/// - my_awesome_book.epub
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/// - html/
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/// - index.html
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/// - ...
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/// - latex/
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/// - my_awesome_book.tex
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///
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pub fn build_dir_for(&self, backend_name: &str) -> PathBuf {
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let build_dir = self.root.join(&self.config.build.build_dir);
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if self.renderers.len() <= 1 {
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build_dir
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} else {
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build_dir.join(backend_name)
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}
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}
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/// Get the directory containing this book's source files.
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pub fn source_dir(&self) -> PathBuf {
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self.root.join(&self.config.book.src)
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}
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/// Get the directory containing the theme resources for the book.
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pub fn theme_dir(&self) -> PathBuf {
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self.config
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.html_config()
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.unwrap_or_default()
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.theme_dir(&self.root)
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}
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}
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/// Look at the `Config` and try to figure out what renderers to use.
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fn determine_renderers(config: &Config) -> Vec<Box<Renderer>> {
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let mut renderers: Vec<Box<Renderer>> = Vec::new();
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if let Some(output_table) = config.get("output").and_then(|o| o.as_table()) {
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for (key, table) in output_table.iter() {
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// the "html" backend has its own Renderer
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if key == "html" {
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renderers.push(Box::new(HtmlHandlebars::new()));
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} else {
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let renderer = interpret_custom_renderer(key, table);
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renderers.push(renderer);
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}
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}
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}
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// if we couldn't find anything, add the HTML renderer as a default
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if renderers.is_empty() {
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renderers.push(Box::new(HtmlHandlebars::new()));
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}
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renderers
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}
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fn default_preprocessors() -> Vec<Box<Preprocessor>> {
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vec![
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Box::new(LinkPreprocessor::new()),
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Box::new(IndexPreprocessor::new()),
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]
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}
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/// Look at the `MDBook` and try to figure out what preprocessors to run.
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fn determine_preprocessors(config: &Config) -> Result<Vec<Box<Preprocessor>>> {
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let preprocess_list = match config.build.preprocess {
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Some(ref p) => p,
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// If no preprocessor field is set, default to the LinkPreprocessor and
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// IndexPreprocessor. This allows you to disable default preprocessors
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// by setting "preprocess" to an empty list.
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None => return Ok(default_preprocessors()),
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};
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let mut preprocessors: Vec<Box<Preprocessor>> = Vec::new();
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for key in preprocess_list {
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match key.as_ref() {
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"links" => preprocessors.push(Box::new(LinkPreprocessor::new())),
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"index" => preprocessors.push(Box::new(IndexPreprocessor::new())),
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_ => bail!("{:?} is not a recognised preprocessor", key),
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}
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}
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Ok(preprocessors)
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}
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fn interpret_custom_renderer(key: &str, table: &Value) -> Box<Renderer> {
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// look for the `command` field, falling back to using the key
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// prepended by "mdbook-"
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let table_dot_command = table
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.get("command")
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.and_then(|c| c.as_str())
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.map(|s| s.to_string());
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let command = table_dot_command.unwrap_or_else(|| format!("mdbook-{}", key));
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Box::new(CmdRenderer::new(key.to_string(), command.to_string()))
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use toml::value::{Table, Value};
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#[test]
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fn config_defaults_to_html_renderer_if_empty() {
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let cfg = Config::default();
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// make sure we haven't got anything in the `output` table
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assert!(cfg.get("output").is_none());
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let got = determine_renderers(&cfg);
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assert_eq!(got.len(), 1);
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assert_eq!(got[0].name(), "html");
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}
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#[test]
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fn add_a_random_renderer_to_the_config() {
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let mut cfg = Config::default();
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cfg.set("output.random", Table::new()).unwrap();
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let got = determine_renderers(&cfg);
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assert_eq!(got.len(), 1);
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assert_eq!(got[0].name(), "random");
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}
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#[test]
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fn add_a_random_renderer_with_custom_command_to_the_config() {
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let mut cfg = Config::default();
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let mut table = Table::new();
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table.insert("command".to_string(), Value::String("false".to_string()));
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cfg.set("output.random", table).unwrap();
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let got = determine_renderers(&cfg);
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assert_eq!(got.len(), 1);
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assert_eq!(got[0].name(), "random");
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}
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#[test]
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fn config_defaults_to_link_and_index_preprocessor_if_not_set() {
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let cfg = Config::default();
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// make sure we haven't got anything in the `output` table
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assert!(cfg.build.preprocess.is_none());
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let got = determine_preprocessors(&cfg);
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assert!(got.is_ok());
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assert_eq!(got.as_ref().unwrap().len(), 2);
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assert_eq!(got.as_ref().unwrap()[0].name(), "links");
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assert_eq!(got.as_ref().unwrap()[1].name(), "index");
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}
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#[test]
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fn config_doesnt_default_if_empty() {
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let cfg_str: &'static str = r#"
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[book]
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title = "Some Book"
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[build]
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build-dir = "outputs"
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create-missing = false
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preprocess = []
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"#;
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let cfg = Config::from_str(cfg_str).unwrap();
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// make sure we have something in the `output` table
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assert!(cfg.build.preprocess.is_some());
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let got = determine_preprocessors(&cfg);
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assert!(got.is_ok());
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assert!(got.unwrap().is_empty());
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}
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#[test]
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fn config_complains_if_unimplemented_preprocessor() {
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let cfg_str: &'static str = r#"
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[book]
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title = "Some Book"
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[build]
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build-dir = "outputs"
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create-missing = false
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preprocess = ["random"]
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"#;
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let cfg = Config::from_str(cfg_str).unwrap();
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// make sure we have something in the `output` table
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assert!(cfg.build.preprocess.is_some());
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let got = determine_preprocessors(&cfg);
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assert!(got.is_err());
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}
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}
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