Add a /wip slash command

It toggles the 'WIP' prefix in the MR title.

3 files changed, 31 insertions, 5 deletions

diff --git a/app/services/merge_requests/base_service.rb b/app/services/merge_requests/base_service.rb
index ba424b09463..d0d155b7ee1 100644
--- a/app/services/merge_requests/base_service.rb
+++ b/app/services/merge_requests/base_service.rb
@@ -5,16 +5,17 @@ module MergeRequests
     end
 
     def create_title_change_note(issuable, old_title)
-      removed_wip = old_title =~ MergeRequest::WIP_REGEX && !issuable.work_in_progress?
-      added_wip = old_title !~ MergeRequest::WIP_REGEX && issuable.work_in_progress?
+      removed_wip = MergeRequest.work_in_progress?(old_title) && !issuable.work_in_progress?
+      added_wip = !MergeRequest.work_in_progress?(old_title) && issuable.work_in_progress?
+      changed_title = MergeRequest.wipless_title(old_title) != issuable.wipless_title
 
       if removed_wip
         SystemNoteService.remove_merge_request_wip(issuable, issuable.project, current_user)
       elsif added_wip
         SystemNoteService.add_merge_request_wip(issuable, issuable.project, current_user)
-      else
-        super
       end
+
+      super if changed_title
     end
 
     def hook_data(merge_request, action, oldrev = nil)
diff --git a/app/services/merge_requests/update_service.rb b/app/services/merge_requests/update_service.rb
index f14f9e4b327..9dbec49d163 100644
--- a/app/services/merge_requests/update_service.rb
+++ b/app/services/merge_requests/update_service.rb
@@ -16,7 +16,7 @@ module MergeRequests
       end
 
       merge_request.merge_params['force_remove_source_branch'] = params.delete(:force_remove_source_branch)
-
+      handle_wip_event(merge_request)
       update(merge_request)
     end
 
@@ -81,5 +81,18 @@ module MergeRequests
     def after_update(issuable)
       issuable.cache_merge_request_closes_issues!(current_user)
     end
+
+    private
+
+    def handle_wip_event(merge_request)
+      if wip_event = params.delete(:wip_event)
+        # We update the title that is provided in the params or we use the mr title
+        title = params[:title] || merge_request.title
+        params[:title] = case wip_event
+                         when 'wip' then MergeRequest.wip_title(title)
+                         when 'unwip' then MergeRequest.wipless_title(title)
+                         end
+      end
+    end
   end
 end
diff --git a/app/services/slash_commands/interpret_service.rb b/app/services/slash_commands/interpret_service.rb
index ffcad5b3a87..1725a30fae5 100644
--- a/app/services/slash_commands/interpret_service.rb
+++ b/app/services/slash_commands/interpret_service.rb
@@ -214,6 +214,18 @@ module SlashCommands
       @updates[:due_date] = nil
     end
 
+    desc do
+      "Toggle the Work In Progress status"
+    end
+    condition do
+      issuable.persisted? &&
+        issuable.respond_to?(:work_in_progress?) &&
+        current_user.can?(:"update_#{issuable.to_ability_name}", issuable)
+    end
+    command :wip do
+      @updates[:wip_event] = issuable.work_in_progress? ? 'unwip' : 'wip'
+    end
+
     # This is a dummy command, so that it appears in the autocomplete commands
     desc 'CC'
     params '@user'