Link issues from comments and automatically close them

Any mention of Issues, MergeRequests, or Commits via GitLab-flavored markdown
references in descriptions, titles, or attached Notes creates a back-reference
Note that links to the original referencer. Furthermore, pushing commits with
commit messages that match a (configurable) regexp to a project's default
branch will close any issues mentioned by GFM in the matched closing phrase.
If accepting a merge request would close any Issues in this way, a banner is
appended to the merge request's main panel to indicate this.

1 files changed, 7 insertions, 0 deletions

diff --git a/app/models/issue.rb b/app/models/issue.rb
index 03c1c166137..ffe9681fc83 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -32,6 +32,7 @@ class Issue < ActiveRecord::Base
   attr_accessible :title, :assignee_id, :position, :description,
                   :milestone_id, :label_list, :author_id_of_changes,
                   :state_event
+  attr_mentionable :title, :description
 
   acts_as_taggable_on :labels
 
@@ -56,4 +57,10 @@ class Issue < ActiveRecord::Base
 
   # Both open and reopened issues should be listed as opened
   scope :opened, -> { with_state(:opened, :reopened) }
+
+  # Mentionable overrides.
+
+  def gfm_reference
+    "issue ##{iid}"
+  end
 end