Don't allow a merge request to be merged when its title starts with "WIP".

CHANGELOG

 Please view this file on the master branch, on stable branches it's out of date.
 v 7.11.0 (unreleased)
+  - Don't allow a merge request to be merged when its title starts with "WIP".
   - Get Gitorious importer to work again.
   - Fix clone URL field and X11 Primary selection (Dmitry Medvinsky)
   - Ignore invalid lines in .gitmodules

app/controllers/projects/merge_requests_controller.rb

@@ -124,13 +124,13 @@ class Projects::MergeRequestsController < Projects::ApplicationController
       @merge_request.check_if_can_be_merged
     end
-    render json: { merge_status: @merge_request.merge_status_name }
+    render json: { merge_status: @merge_request.automerge_status }
   end
   def automerge
     return access_denied! unless allowed_to_merge?
-    if @merge_request.open? && @merge_request.can_be_merged?
+    if @merge_request.automergeable?
       AutoMergeWorker.perform_async(@merge_request.id, current_user.id, params)
       @status = true
     else

app/models/merge_request.rb

@@ -199,6 +199,8 @@ class MergeRequest < ActiveRecord::Base
   end
   def automerge!(current_user, commit_message = nil)
+    return unless automergeable?
+
     MergeRequests::AutoMergeService.
       new(target_project, current_user).
       execute(self, commit_message)
@@ -208,6 +210,22 @@ class MergeRequest < ActiveRecord::Base
     opened? || reopened?
   end
+  def work_in_progress?
+    title =~ /\A\[?WIP\]?:? /i
+  end
+
+  def automergeable?
+    open? && !work_in_progress? && can_be_merged?
+  end
+
+  def automerge_status
+    if work_in_progress?
+      "work_in_progress"
+    else
+      merge_status_name
+    end
+  end
+
   def mr_and_commit_notes
     # Fetch comments only from last 100 commits
     commits_for_notes_limit = 100

app/views/projects/merge_requests/_show.html.haml

@@ -72,6 +72,6 @@
     check_enable: #{@merge_request.unchecked? ? "true" : "false"},
     url_to_ci_check: "#{ci_status_namespace_project_merge_request_path(@project.namespace, @project, @merge_request)}",
     ci_enable: #{@project.ci_service ? "true" : "false"},
-    current_status: "#{@merge_request.merge_status_name}",
+    current_status: "#{@merge_request.automerge_status}",
     action: "#{controller.action_name}"
   });

app/views/projects/merge_requests/show/_mr_accept.html.haml

@@ -4,9 +4,11 @@
       %strong Archived projects cannot be committed to!
   - else
     .automerge_widget.cannot_be_merged.hide
-      %strong This can't be merged automatically, even if it could be merged you don't have the permission to do so.
+      %strong This request can't be merged automatically. Even if it could be merged, you don't have permission to do so.
+    .automerge_widget.work_in_progress.hide
+      %strong This request can't be merged automatically because it is marked a Work In Progress. Even if it could be merged, you don't have permission to do so.
     .automerge_widget.can_be_merged.hide
-      %strong This can be merged automatically but you don't have the permission to do so.
+      %strong This request can be merged automatically, but you don't have permission to do so.
 - if @show_merge_controls
@@ -57,6 +59,18 @@
        
       This usually happens when git can not resolve conflicts between branches automatically.
+  .automerge_widget.work_in_progress.hide
+    %h4
+      This request can't be merged because it is marked a <strong>Work In Progress</strong>.
+
+    %p
+      %button.btn.disabled
+        %i.fa.fa-warning
+        Accept Merge Request
+      &nbsp;
+
+      When the merge request is ready, remove the "WIP" prefix from the title to allow it to be merged.
+
   .automerge_widget.unchecked
     %p
       %strong

lib/api/merge_requests.rb

@@ -186,7 +186,7 @@ module API
             merge_request.check_if_can_be_merged
           end
-          if merge_request.open?
+          if merge_request.open? && !merge_request.work_in_progress?
             if merge_request.can_be_merged?
               merge_request.automerge!(current_user, params[:merge_commit_message] || merge_request.merge_commit_message)
               present merge_request, with: Entities::MergeRequest
@@ -195,7 +195,7 @@ module API
             end
           else
             # Merge request can not be merged
-            # because it is already closed/merged
+            # because it is already closed/merged or marked as WIP
             not_allowed!
           end
         else

spec/models/merge_request_spec.rb

@@ -115,6 +115,32 @@ describe MergeRequest do
     end
   end
+  describe "#work_in_progress?" do
+    it "detects the 'WIP ' prefix" do
+      subject.title = "WIP #{subject.title}"
+      expect(subject).to be_work_in_progress
+    end
+
+    it "detects the 'WIP: ' prefix" do
+      subject.title = "WIP: #{subject.title}"
+      expect(subject).to be_work_in_progress
+    end
+
+    it "detects the '[WIP] ' prefix" do
+      subject.title = "[WIP] #{subject.title}"
+      expect(subject).to be_work_in_progress
+    end
+
+    it "doesn't detect WIP for words starting with WIP" do
+      subject.title = "Wipwap #{subject.title}"
+      expect(subject).not_to be_work_in_progress
+    end
+
+    it "doesn't detect WIP by default" do
+      expect(subject).not_to be_work_in_progress
+    end
+  end
+
   it_behaves_like 'an editable mentionable' do
     subject { create(:merge_request, source_project: project, target_project: project) }

spec/requests/api/merge_requests_spec.rb

@@ -312,6 +312,13 @@ describe API::API, api: true  do
       expect(json_response['message']).to eq('405 Method Not Allowed')
     end
+    it "should return 405 if merge_request is a work in progress" do
+      merge_request.update_attribute(:title, "WIP: #{merge_request.title}")
+      put api("/projects/#{project.id}/merge_request/#{merge_request.id}/merge", user)
+      expect(response.status).to eq(405)
+      expect(json_response['message']).to eq('405 Method Not Allowed')
+    end
+
     it "should return 401 if user has no permissions to merge" do
       user2 = create(:user)
       project.team << [user2, :reporter]