Auto-merge: checking via AJAX

app/assets/javascripts/merge_requests.js

 var MergeRequest = { 
   diffs_loaded: false,
   commits_loaded: false,
+  opts: false,
 
   init:
-    function() { 
+    function(opts) {
+      this.opts = opts;
+
+      if($(".automerge_widget").lenght){
+        $.get(opts.url_to_automerge_check, function(data){
+          $(".automerge_widget").hide();
+          $(".automerge_widget." + data.state).show();
+        }, "json");
+      }
+
       $(".tabs a").live("click", function() { 
         $(".tabs a").parent().removeClass("active");
         $(this).parent().addClass("active");

app/controllers/merge_requests_controller.rb

@@ -2,7 +2,7 @@ class MergeRequestsController < ApplicationController
   before_filter :authenticate_user!
   before_filter :project
   before_filter :module_enabled
-  before_filter :merge_request, :only => [:edit, :update, :destroy, :show, :commits, :diffs, :automerge]
+  before_filter :merge_request, :only => [:edit, :update, :destroy, :show, :commits, :diffs, :automerge, :automerge_check]
   layout "project"
 
   # Authorize
@@ -45,10 +45,6 @@ class MergeRequestsController < ApplicationController
     # or from cache if already merged
     @commits = @merge_request.commits
 
-    if @merge_request.unchecked? 
-      @merge_request.check_if_can_be_merged
-    end
-
     respond_to do |format|
       format.html
       format.js
@@ -100,6 +96,13 @@ class MergeRequestsController < ApplicationController
     end
   end
 
+  def automerge_check
+    if @merge_request.unchecked? 
+      @merge_request.check_if_can_be_merged
+    end
+    render :json => {:state => @merge_request.human_state}
+  end
+
   def automerge
     render_404 unless @merge_request.open? && @merge_request.can_be_merged?
     return access_denied! unless can?(current_user, :accept_mr, @project)

app/models/merge_request.rb

@@ -49,6 +49,15 @@ class MergeRequest < ActiveRecord::Base
     where("source_branch like :branch or target_branch like :branch", :branch => branch_name)
   end
 
+  def human_state
+    states = {
+      CAN_BE_MERGED =>  "can_be_merged",
+      CANNOT_BE_MERGED => "cannot_be_merged",
+      UNCHECKED => "unchecked"
+    }
+    states[self.state]
+  end
+
   def validate_branches
     if target_branch == source_branch
       errors.add :base, "You can not use same branch for source and target branches"

app/views/merge_requests/show.html.haml

@@ -54,19 +54,26 @@
 
 
 - if @merge_request.open? && @commits.any? && can?(current_user, :accept_mr, @project)
-  - if @merge_request.can_be_merged?
+  .automerge_widget.can_be_merged{:style => "display:none"}
     .ui-box.padded
       %p 
         You can accept this request automatically. If you still want to do it manually - #{link_to "click here", "#", :class => "how_to_merge_link vlink", :title => "How To Merge"} for instructions
       = link_to "Accept Merge Request", automerge_project_merge_request_path(@project, @merge_request), :class => "btn small info accept_merge_request", :remote => true
        
       
-  - else
+  .automerge_widget.cannot_be_merged{:style => "display:none"}
     .alert-message
       %p
         %strong This request cant be merged with GitLab. You should do it manually  
         = link_to "Show how to merge", "#", :class => "how_to_merge_link btn small padded", :title => "How To Merge"
   
+  .automerge_widget.unchecked
+    .alert-message
+      %p
+        %strong Checking for ability to automatically merge… 
+
+
+
 
 = render "merge_requests/commits"
 
@@ -87,7 +94,9 @@
 
 :javascript
   $(function(){
-    MergeRequest.init();
+    MergeRequest.init({
+      url_to_automerge_check: "#{automerge_check_project_merge_request_path(@project, @merge_request)}",
+    });
 
     $(".accept_merge_request").live("ajax:beforeSend", function() {
       $(this).replaceWith('#{image_tag "ajax_loader.gif"}');

config/routes.rb

@@ -103,6 +103,7 @@ Gitlab::Application.routes.draw do
       member do 
         get :diffs
         get :automerge
+        get :automerge_check
       end
 
       collection do 

lib/gitlab_merge.rb

@@ -29,6 +29,7 @@ class GitlabMerge
 
   def pull
     self.project.repo.git.clone({:branch => merge_request.target_branch}, project.url_to_repo, merge_path)
+    #TODO When user do not have permissions then raise exception
     Dir.chdir(merge_path) do
       merge_repo = Grit::Repo.new('.')
       merge_repo.git.sh "git config user.name \"#{user.name}\""