# File lib/gitlab_git/commit.rb, line 123
        def diff_from_parent(rugged_commit, options = {})
          options ||= {}
          break_rewrites = options[:break_rewrites]
          actual_options = Diff.filter_diff_options(options)

          diff = if rugged_commit.parents.empty?
                   rugged_commit.diff(actual_options.merge(reverse: true))
                 else
                   rugged_commit.parents[0].diff(rugged_commit, actual_options)
                 end

          diff.find_similar!(break_rewrites: break_rewrites)
          diff
        end