WebEditor: base implementation

app/controllers/tree_controller.rb

@@ -26,8 +26,14 @@ class TreeController < ProjectResourceController
 
   def update
     file_editor = Gitlab::FileEditor.new(current_user, @project, @ref)
-    if file_editor.can_edit?(@path, params[:last_commit])
-      file_editor.update(@path, params[:content])
+    update_status = file_editor.update(
+      @path, 
+      params[:content], 
+      params[:commit_message], 
+      params[:last_commit]
+    )
+    
+    if update_status
       redirect_to project_tree_path(@project, @id), :notice => "File has been successfully changed"
     else
       flash[:notice] = "You can't save file because it has been changed"

app/views/tree/edit.html.haml

@@ -13,10 +13,15 @@
       = text_area_tag 'commit_message'
     .form-actions
       = hidden_field_tag 'last_commit', @last_commit
-      = hidden_field_tag 'content'
-      = submit_tag "Save", class: 'btn save-btn'
+      = hidden_field_tag 'content', '', :id => :file_content
+      = button_tag "Save", class: 'btn save-btn'
 
 :javascript
   var editor = ace.edit("editor");
   editor.setTheme("ace/theme/twilight");
   editor.getSession().setMode("ace/mode/javascript");
+
+  $(".save-btn").click(function(){
+    $("#file_content").val(editor.getValue());
+    $(".form_editor form").submit();
+  });