1 files changed, 32 insertions, 7 deletions
diff --git a/app/models/commit.rb b/app/models/commit.rb
index be5a118bfec..f02fe240540 100644
--- a/app/models/commit.rb
+++ b/app/models/commit.rb
@@ -1,9 +1,11 @@
 class Commit
-  include ActiveModel::Conversion
-  include StaticModel
   extend ActiveModel::Naming
+
+  include ActiveModel::Conversion
   include Mentionable
   include Participable
+  include Referable
+  include StaticModel
 
   attr_mentionable :safe_message
   participant :author, :committer, :notes, :mentioned_users
@@ -56,6 +58,34 @@ class Commit
     @raw.id
   end
 
+  def ==(other)
+    (self.class === other) && (raw == other.raw)
+  end
+
+  def self.reference_prefix
+    '@'
+  end
+
+  # Pattern used to extract commit references from text
+  #
+  # The SHA can be between 6 and 40 hex characters.
+  #
+  # This pattern supports cross-project references.
+  def self.reference_pattern
+    %r{
+      (?:#{Project.reference_pattern}#{reference_prefix})?
+      (?<commit>\h{6,40})
+    }x
+  end
+
+  def to_reference(from_project = nil)
+    if cross_project_reference?(from_project)
+      "#{project.to_reference}@#{id}"
+    else
+      id
+    end
+  end
+
   def diff_line_count
     @diff_line_count ||= Commit::diff_line_count(self.diffs)
     @diff_line_count
@@ -126,11 +156,6 @@ class Commit
     Gitlab::ClosingIssueExtractor.new(project, current_user).closed_by_message(safe_message)
   end
 
-  # Mentionable override.
-  def gfm_reference
-    "commit #{id}"
-  end
-
   def author
     User.find_for_commit(author_email, author_name)
   end