git authors over time

authors-over-time.rb

require 'set'
require 'date'

author = nil
authors = {}

`git log`.split("\n").reverse.each do |line|
  if line.match(/^Author:\s+(.*)$/)
    author = $1
  end

  if line.match(/^Date:\s+(.*)$/)
    date = Date.parse $1
    if author && date
    	if authors[author].nil? || authors[author] > date
    		authors[author] = date
    	end
    end
    author = nil
  end
end

i = 0
authors.sort_by { |k, v| v }.each do |author, date|
	i += 1
  puts "#{date}\t#{i}" #\t#{author}
end