app/models/diff.rb

	diff.rb revision 4e449617be908ec2af2d15bdecc72002a2dd2c8a
class Diff < FakeRecord
  attr_reader :repository, :oid, :changed_files, :commit

  def self.find(opts)
    new(opts)
  end

  def initialize(opts)
    @repository = Repository.find_by_path(opts[:repository_id])
    @commit_id = compute_ref(repository, opts[:ref])

    @oid = @commit_id[:oid]

    @changed_files = repository.changed_files(oid)
    @diff = repository.git.diff(oid)
  end

  def compute
    if !@computed && @diff != :diff_too_large
      raw_diffs = @diff.split('diff --git a/')[1..-1]

      changed_files.each do |file_change|
        d = raw_diffs.select { |d| d.start_with?(file_change.old_path) }.first

        # the first n lines are just metadata
        n = case file_change.status
        when :added
          6
        when :deleted
          6
        when :modified
          5
        when :renamed
          5
        end

        file_change.diff = d.split("\n", n).last[0..-2]
      end
      @computed = true
    end

    @computed
  end

  protected

  def compute_ref(repository, ref)
    repository.commit_id(ref || Settings.git.default_branch)
  end
end