stat.rb

  class Repo
    def initialize(path)
      @path = path
    end

    def commits
      @commits ||= log.
        gsub(/\t/, " "). # remove tabs
        split('$$'). # split by marker
        select { |commit| commit != "" }. # only consider non-empty
        map { |commit| Commit.new(commit) } # instantiate commits
    end

    def log
      @log ||= Dir.chdir(@path) do
        `git log --format='$$^^%h^^%ct^^%B' --numstat`
      end
    end
  end