Hook up compare revisions selector

lib/gollum/frontend/public/javascript/gollum.js

@@ -29,26 +29,34 @@ $(document).ready(function() {
   
     $('#wiki-history td.revert-action a').mouseenter(highlightOn);
     $('#wiki-history td.revert-action a').mouseleave(highlightOff);
+    
+    if ($('td.revert-action a').length) {
+      $('td.revert-action a').click(function(e) {
+        e.preventDefault();
+
+        var commitSha = $(this).attr('rel');
+        var truncatedSha = commitSha.toString().substr(0, 7);
+        // revert action
+        $.GollumDialog.init({
+          title: 'Revert to ' + truncatedSha + '?',
+          body: 'Are you sure you wish to revert to commit <code>' +
+                truncatedSha + '</code>' + 
+                ' ? This will overwrite any previous changes.',
+          OK: function() {
+            // TODO add async endpoint to revert here
+          }
+        });
+      });
+    }
+
+    if ($('.history a.action-compare-revision').length) {
+      $('.history a.action-compare-revision').click(function() {
+        $("#version-form").submit();
+      });
+    }
   }
   
-  if ($('td.revert-action a').length) {
+
-    $('td.revert-action a').click(function(e) {
-      e.preventDefault();
-      
-      var commitSha = $(this).attr('rel');
-      var truncatedSha = commitSha.toString().substr(0, 7);
-      // revert action
-      $.GollumDialog.init({
-        title: 'Revert to ' + truncatedSha + '?',
-        body: 'Are you sure you wish to revert to commit <code>' +
-              truncatedSha + '</code>' + 
-              ' ? This will overwrite any previous changes.',
-        OK: function() {
-          // TODO add async endpoint to revert here
-        }
-      });
-    });
-  }
   
   if ($('#searchbar a#search-submit').length) {
     $.GollumPlaceholder.add($('#searchbar #search-query'));