Add default commit messages when using gollum editor.

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

@@ -168,6 +168,11 @@
     },
 
     setActiveLanguage: function( name ) {
+      // On first load _ACTIVE_LANG.length is 0 and evtChangeFormat isn't called.
+      if ( LanguageDefinition._ACTIVE_LANG.length <= 0 ) {
+        FormatSelector.updateCommitMessage( name );
+      }
+
       if(LanguageDefinition.getHookFunctionFor("deactivate")) {
         LanguageDefinition.getHookFunctionFor("deactivate")();
       }
@@ -747,9 +752,18 @@
       */
      evtChangeFormat: function( e ) {
        var newMarkup = $(this).val();
+       FormatSelector.updateCommitMessage( newMarkup );
        LanguageDefinition.setActiveLanguage( newMarkup );
      },
 
+     updateCommitMessage: function( newMarkup ) {
+       var msg = document.getElementById( "gollum-editor-message-field" );
+       var val = msg.value;
+       // Must start with created or updated.
+       if (/^(?:created|updated)/i.test(val)) {
+         msg.value = val.replace( /\([^\)]*\)$/, "(" + newMarkup + ")" );
+       }
+     },
 
      /**
       *  FormatSelector.init

lib/gollum/frontend/templates/editor.mustache

@@ -112,10 +112,14 @@
     
     <div id="gollum-editor-edit-summary" class="singleline">
       <label for="message" class="jaws">Edit message:</label>
-      <input type="text" name="message" id="gollum-editor-message-field" value="Write a small message here explaining this change. (Optional)">
+      {{#is_create_page}}
+      <input type="text" name="message" id="gollum-editor-message-field" value="Created {{page_name}} ({{format}})">
+      {{/is_create_page}}
+      {{#is_edit_page}}
+      <input type="text" name="message" id="gollum-editor-message-field" value="Updated {{page_name}} ({{format}})">
+      {{/is_edit_page}}
     </div>
     
-    
     <span class="jaws"><br></span>
     <input type="submit" id="gollum-editor-submit" value="Save" title="Save current changes">
     <a href="/preview" id="gollum-editor-preview" class="minibutton" title="Preview this Page">Preview</a>