Add favicon support to theme

src/renderer/html_handlebars/hbs_renderer.rs

@@ -170,6 +170,12 @@ impl Renderer for HtmlHandlebars {
         };
         try!(css_file.write_all(&theme.css));
 
+        // Favicon
+        let mut favicon_file = if let Ok(f) = File::create(book.get_dest().join("favicon.png")) { f } else {
+            return Err(Box::new(io::Error::new(io::ErrorKind::Other, "Could not create favicon.png")))
+        };
+        try!(favicon_file.write_all(&theme.favicon));
+
         // JQuery local fallback
         let mut jquery = if let Ok(f) = File::create(book.get_dest().join("jquery.js")) { f } else {
             return Err(Box::new(io::Error::new(io::ErrorKind::Other, "Could not create jquery.js")))
@@ -235,6 +241,7 @@ fn make_data(book: &MDBook) -> Result<BTreeMap<String,Json>, Box<Error>> {
     let mut data  = BTreeMap::new();
     data.insert("language".to_owned(), "en".to_json());
     data.insert("title".to_owned(), book.get_title().to_json());
+    data.insert("favicon".to_owned(), "favicon.png".to_json());
 
     let mut chapters = vec![];
 

src/theme/index.hbs

@@ -12,6 +12,8 @@
         <link rel="stylesheet" href="book.css">
         <link href='http://fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,600italic,700italic,800italic,400,300,600,700,800' rel='stylesheet' type='text/css'>
 
+        <link rel="shortcut icon" href="{{ favicon }}">
+
         <!-- Font Awesome -->
         <link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/font-awesome/4.3.0/css/font-awesome.min.css">
 

src/theme/mod.rs

@@ -5,6 +5,7 @@ use std::io::Read;
 
 pub static INDEX: &'static [u8] = include_bytes!("index.hbs");
 pub static CSS: &'static [u8] = include_bytes!("book.css");
+pub static FAVICON: &'static [u8] = include_bytes!("favicon.png");
 pub static JS: &'static [u8] = include_bytes!("book.js");
 pub static HIGHLIGHT_JS: &'static [u8] = include_bytes!("highlight.js");
 pub static TOMORROW_NIGHT_CSS: &'static [u8] = include_bytes!("tomorrow-night.css");
@@ -27,6 +28,7 @@ pub static FONT_AWESOME_OTF: &'static [u8] = include_bytes!("_FontAwesome/fonts/
 pub struct Theme {
     pub index: Vec<u8>,
     pub css: Vec<u8>,
+    pub favicon: Vec<u8>,
     pub js: Vec<u8>,
     pub highlight_css: Vec<u8>,
     pub tomorrow_night_css: Vec<u8>,
@@ -41,6 +43,7 @@ impl Theme {
         let mut theme = Theme {
             index: INDEX.to_owned(),
             css: CSS.to_owned(),
+            favicon: FAVICON.to_owned(),
             js: JS.to_owned(),
             highlight_css: HIGHLIGHT_CSS.to_owned(),
             tomorrow_night_css: TOMORROW_NIGHT_CSS.to_owned(),
@@ -79,6 +82,12 @@ impl Theme {
             let _ = f.read_to_end(&mut theme.css);
         }
 
+        // favicon.png
+        if let Ok(mut f) = File::open(&src.join("favicon.png")) {
+            theme.favicon.clear();
+            let _ = f.read_to_end(&mut theme.favicon);
+        }
+
         // highlight.js
         if let Ok(mut f) = File::open(&src.join("highlight.js")) {
             theme.highlight_js.clear();