Hides rust code lines prepended with #

src/theme/book.css

@@ -9,6 +9,9 @@ body {
 .right {
   float: right;
 }
+.hidden {
+  display: none;
+}
 h2,
 h3 {
   margin-top: 2.5em;

src/theme/book.js

@@ -119,13 +119,20 @@ $( document ).ready(function() {
 
     $("code.language-rust").each(function(i, block){
         var lines = $(this).html().split("\n");
+        var first_non_hidden_line = false;
 
         for(var n = 0; n < lines.length; n++){
             if($.trim(lines[n])[0] == hiding_character){
-                lines[n] = "<span class=\"hidden\">" + lines[n] + "</span>"
+                lines[n] = "<span class=\"hidden\">" + lines[n] + "</span>";
+            }
+            else if(first_non_hidden_line) {
+                lines[n] = "\n" + lines[n];
+            }
+            else {
+                first_non_hidden_line = true;
             }
         }
-        $(this).html(lines.join());
+        $(this).html(lines.join(""));
     });
 
 

src/theme/stylus/general.styl

@@ -11,4 +11,8 @@ html, body {
     float: right
 }
 
+.hidden {
+    display: none;
+}
+
 h2, h3 { margin-top: 2.5em }