git churn

git-churn.rb

#! /usr/bin/env ruby

IO.popen('git log --name-only --pretty=format:""')
  .readlines
  .map(&:chomp)
  .reject(&:empty?)
  .select { |file| File.exists?(File.expand_path(file, ENV['GIT_WORK_TREE'])) }
  .each_with_object(Hash.new(0)) { |file, changes| changes[file] += 1 }
  .to_a
  .sort_by(&:last)
  .reverse_each { |file, churn| puts "#{churn.to_s.ljust 5} #{file}" }