method-chaining.rb

  def diffs(repo, from, to)
    repo.call_git("diff ?..?", from, to).stdout.
      strip.
      split(/diff --git.*?$/).
      map(&:strip).
      uniq.
      map { |d| d.blank? ? nil : d }.
      compact.
      map { |d| [diff_head(d), d] }
  end