git histogram of commits over hours

git-histogram.rb

# http://twitter.com/#!/mfeathers/status/61229026034978817
`git log | grep "^Date"`.split($/).map { |line| line.split(' ')[4].split(':')[0] }.group_by { |x| x }.map {|k,v| [k,v.length] }

.sort.group_by { |x| x } should just be written as .group_by { |x| x }. sort is unnecessary

Thanks!