1 files changed, 28 insertions, 2 deletions
diff --git a/app/models/commit_range.rb b/app/models/commit_range.rb
index e6456198264..86fc9eb01a3 100644
--- a/app/models/commit_range.rb
+++ b/app/models/commit_range.rb
@@ -19,6 +19,7 @@
 #
 class CommitRange
   include ActiveModel::Conversion
+  include Referable
 
   attr_reader :sha_from, :notation, :sha_to
 
@@ -28,10 +29,24 @@ class CommitRange
   # See `exclude_start?`
   attr_reader :exclude_start
 
-  # The beginning and ending SHA sums can be between 6 and 40 hex characters,
-  # and the range selection can be double- or triple-dot.
+  # The beginning and ending SHAs can be between 6 and 40 hex characters, and
+  # the range notation can be double- or triple-dot.
   PATTERN = /\h{6,40}\.{2,3}\h{6,40}/
 
+  def self.reference_prefix
+    '@'
+  end
+
+  # Pattern used to extract commit range references from text
+  #
+  # This pattern supports cross-project references.
+  def self.reference_pattern
+    %r{
+      (?:#{Project.reference_pattern}#{reference_prefix})?
+      (?<commit_range>#{PATTERN})
+    }x
+  end
+
   # Initialize a CommitRange
   #
   # range_string - The String commit range.
@@ -59,6 +74,17 @@ class CommitRange
     "#{sha_from[0..7]}#{notation}#{sha_to[0..7]}"
   end
 
+  def to_reference(from_project = nil)
+    # Not using to_s because we want the full SHAs
+    reference = sha_from + notation + sha_to
+
+    if cross_project_reference?(from_project)
+      reference = project.to_reference + '@' + reference
+    end
+
+    reference
+  end
+
   # Returns a String for use in a link's title attribute
   def reference_title
     "Commits #{suffixed_sha_from} through #{sha_to}"