gistfile1.rb

namespace :analyze do  
  namespace :commits do
    desc 'Flog the most commonly revised files in the git history'
    task :most_changed_files do
      counts = Hash.new(0)
      IO.popen("PAGER=cat git log --name-only --pretty=oneline 2>&1") do |pipe|
        while (!pipe.eof) do
          line = pipe.readline
          next unless line =~ /^(app|lib).*\.rb$/
          counts[line.chomp] += 1
        end
      end
      counts.sort_by{|item| item.last}.reverse.first(15).each do |item|
        flog_score = `flog -s #{item.first}`.to_f.round
        puts "#{item.first} (in #{item.last} commits) (Flog: #{flog_score})"
      end
    end
  end
end