Add support for watching additional directories

Author: willcrichton

src/cmd/serve.rs

@@ -55,6 +55,7 @@ pub fn make_subcommand<'help>() -> App<'help> {
                 .help("Port to use for HTTP connections"),
         )
         .arg(arg!(-o --open "Opens the compiled book in a web browser"))
+        .arg(arg!(--"extra-watch-dirs" <dirs> "Extra directories to watch, comma separated"))
 }
 
 // Serve command implementation
@@ -110,24 +111,26 @@ pub fn execute(args: &ArgMatches) -> Result<()> {
     }
 
     #[cfg(feature = "watch")]
-    watch::trigger_on_change(&book, move |paths, book_dir| {
-        info!("Files changed: {:?}", paths);
-        info!("Building book...");
-
-        // FIXME: This area is really ugly because we need to re-set livereload :(
-        let result = MDBook::load(&book_dir).and_then(|mut b| {
-            update_config(&mut b);
-            b.build()
+    {
+        let extra_dirs = watch::parse_extra_dirs(args.value_of("extra-watch-dirs"))?;
+        watch::trigger_on_change(&book, &extra_dirs, move |paths, book_dir| {
+            info!("Files changed: {:?}", paths);
+            info!("Building book...");
+
+            // FIXME: This area is really ugly because we need to re-set livereload :(
+            let result = MDBook::load(&book_dir).and_then(|mut b| {
+                update_config(&mut b);
+                b.build()
+            });
+
+            if let Err(e) = result {
+                error!("Unable to load the book");
+                utils::log_backtrace(&e);
+            } else {
+                let _ = tx.send(Message::text("reload"));
+            }
         });
-
-        if let Err(e) = result {
-            error!("Unable to load the book");
-            utils::log_backtrace(&e);
-        } else {
-            let _ = tx.send(Message::text("reload"));
-        }
-    });
-
+    }
     let _ = thread_handle.join();
 
     Ok(())

src/cmd/watch.rs

@@ -29,6 +29,7 @@ pub fn make_subcommand<'help>() -> App<'help> {
             (Defaults to the Current Directory when omitted)"
         ))
         .arg(arg!(-o --open "Opens the compiled book in a web browser"))
+        .arg(arg!(--"extra-watch-dirs" <dirs> "Extra directories to watch, comma separated"))
 }
 
 // Watch command implementation
@@ -53,7 +54,8 @@ pub fn execute(args: &ArgMatches) -> Result<()> {
         open(path);
     }
 
-    trigger_on_change(&book, |paths, book_dir| {
+    let extra_dirs = parse_extra_dirs(args.value_of("extra-watch-dirs"))?;
+    trigger_on_change(&book, &extra_dirs, |paths, book_dir| {
         info!("Files changed: {:?}\nBuilding book...\n", paths);
         let result = MDBook::load(&book_dir).and_then(|mut b| {
             update_config(&mut b);
@@ -116,8 +118,19 @@ fn filter_ignored_files(exclusion_checker: gitignore::File, paths: &[PathBuf]) -
         .collect()
 }
 
+/// Turn comma-separated list of directories into a Vec<PathBuf>
+pub fn parse_extra_dirs(dirs: Option<&str>) -> Result<Vec<PathBuf>> {
+    match dirs {
+        Some(dirs) => dirs
+            .split(",")
+            .map(|s| Ok(PathBuf::from(s).canonicalize()?))
+            .collect::<Result<Vec<_>>>(),
+        None => Ok(Vec::new()),
+    }
+}
+
 /// Calls the closure when a book source file is changed, blocking indefinitely.
-pub fn trigger_on_change<F>(book: &MDBook, closure: F)
+pub fn trigger_on_change<F>(book: &MDBook, extra_dirs: &[PathBuf], closure: F)
 where
     F: Fn(Vec<PathBuf>, &Path),
 {
@@ -146,6 +159,10 @@ where
     // Add the book.toml file to the watcher if it exists
     let _ = watcher.watch(book.root.join("book.toml"), NonRecursive);
 
+    for dir in extra_dirs {
+        let _ = watcher.watch(dir, Recursive);
+    }
+
     info!("Listening for changes...");
 
     loop {