Fix {{#include}} directives for default language

guide/src/en/SUMMARY.md

@@ -21,6 +21,7 @@
         - [Syntax highlighting](format/theme/syntax-highlighting.md)
         - [Editor](format/theme/editor.md)
     - [MathJax Support](format/mathjax.md)
+    - [Localization](format/localization.md)
     - [mdBook-specific features](format/mdbook.md)
 - [Continuous Integration](continuous-integration.md)
 - [For Developers](for_developers/README.md)

guide/src/en/format/configuration/localization.md

@@ -0,0 +1 @@
+# Localization

src/book/mod.rs

@@ -215,26 +215,35 @@ impl MDBook {
 
     /// Run the entire build process for a particular [`Renderer`].
     pub fn execute_build_process(&self, renderer: &dyn Renderer) -> Result<()> {
-        let preprocess_ctx = PreprocessorContext::new(
-            self.root.clone(),
-            self.build_opts.clone(),
-            self.config.clone(),
-            renderer.name().to_string(),
-        );
-
         let preprocessed_books = match &self.book {
             LoadedBook::Localized(ref books) => {
                 let mut new_books = HashMap::new();
 
-                for (ident, book) in books.0.iter() {
+                for (language_ident, book) in books.0.iter() {
+                    let preprocess_ctx = PreprocessorContext::new(
+                        self.root.clone(),
+                        Some(language_ident.clone()),
+                        self.build_opts.clone(),
+                        self.config.clone(),
+                        renderer.name().to_string(),
+                    );
+
                     let preprocessed_book =
                         self.preprocess(&preprocess_ctx, renderer, book.clone())?;
-                    new_books.insert(ident.clone(), preprocessed_book);
+                    new_books.insert(language_ident.clone(), preprocessed_book);
                 }
 
                 LoadedBook::Localized(LocalizedBooks(new_books))
             }
             LoadedBook::Single(ref book) => {
+                let preprocess_ctx = PreprocessorContext::new(
+                    self.root.clone(),
+                    None,
+                    self.build_opts.clone(),
+                    self.config.clone(),
+                    renderer.name().to_string(),
+                );
+
                 LoadedBook::Single(self.preprocess(&preprocess_ctx, renderer, book.clone())?)
             }
         };
@@ -273,10 +282,17 @@ impl MDBook {
         self
     }
 
-    fn test_book(&self, book: &Book, temp_dir: &TempDir, library_args: &Vec<&str>) -> Result<()> {
+    fn test_book(
+        &self,
+        book: &Book,
+        temp_dir: &TempDir,
+        library_args: &Vec<&str>,
+        language_ident: Option<String>,
+    ) -> Result<()> {
         // FIXME: Is "test" the proper renderer name to use here?
         let preprocess_context = PreprocessorContext::new(
             self.root.clone(),
+            language_ident,
             self.build_opts.clone(),
             self.config.clone(),
             "test".to_string(),

src/cmd/watch.rs

@@ -50,10 +50,11 @@ pub fn execute(args: &ArgMatches) -> Result<()> {
 
     trigger_on_change(&book, |paths, book_dir| {
         info!("Files changed: {:?}\nBuilding book...\n", paths);
-        let result = MDBook::load_with_build_opts(&book_dir, build_opts.clone()).and_then(|mut b| {
-            update_config(&mut b);
-            b.build()
-        });
+        let result =
+            MDBook::load_with_build_opts(&book_dir, build_opts.clone()).and_then(|mut b| {
+                update_config(&mut b);
+                b.build()
+            });
 
         if let Err(e) = result {
             error!("Unable to build the book");

src/preprocess/links.rs

@@ -42,7 +42,11 @@ impl Preprocessor for LinkPreprocessor {
     }
 
     fn run(&self, ctx: &PreprocessorContext, mut book: Book) -> Result<Book> {
-        let src_dir = ctx.source_dir();
+        let src_dir = ctx
+            .config
+            .get_localized_src_path(ctx.language_ident.as_ref())
+            .unwrap();
+        let src_dir = ctx.root.join(src_dir);
 
         book.for_each_mut(|section: &mut BookItem| {
             if let BookItem::Chapter(ref mut ch) = *section {

src/preprocess/mod.rs

@@ -23,6 +23,9 @@ use std::path::PathBuf;
 pub struct PreprocessorContext {
     /// The location of the book directory on disk.
     pub root: PathBuf,
+    /// The language of the book being built. Is only `Some` if the book is part
+    /// of a multilingual build output.
+    pub language_ident: Option<String>,
     /// The build options passed from the frontend.
     pub build_opts: BuildOpts,
     /// The book configuration (`book.toml`).
@@ -41,12 +44,14 @@ impl PreprocessorContext {
     /// Create a new `PreprocessorContext`.
     pub(crate) fn new(
         root: PathBuf,
+        language_ident: Option<String>,
         build_opts: BuildOpts,
         config: Config,
         renderer: String,
     ) -> Self {
         PreprocessorContext {
             root,
+            language_ident,
             build_opts,
             config,
             renderer,