gitproductive.rb

class GitProductive
  attr_accessor :directory, :lines, :commits

  def initialize(directory = Dir.pwd)
    raise "#{directory} is not a git repository" unless Dir.entries(directory).include?(".git")
    @directory = directory
    @lines, @commits = 0, 0
  end
   
  def check!(duration = "1 days")
    Dir.chdir(@directory)
    output = `git log --shortstat --since="#{duration} ago" | grep insertions`.split("\n")
    @commits = output.size
     
    output.each do |commit|
      @lines += commit.match(/(\d+) insertions/)[0].to_i
    end
  end
   
  def stats(duration = "1 days")
    check!(duration)
    '%.2f' % (@commits == 0 ? 0 : @lines / @commits.to_f)
  end
end
 
# Example
# git_productive = GitProductive.new(ARGV[0] || Dir.pwd)
# puts "#{git_productive.stats} lines per commit today"
# puts "#{git_productive.stats('3 weeks')} lines per commit in the last 3 weeks"