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#!/usr/bin/env ruby
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#
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# The committer_count.rb is a way to tell who's been active over the last
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# given period. It's of course, quite coarse -- someone with 10 commits in a day
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# may or may not be more productive than someone with 3, but over long enough
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# periods, it's an okay metric to measure involvement with the project, since
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# large and small commits will tend to average out.
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#
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# Note that this includes merge commits by default (which usually means at least
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# code review happened, so it's still a measure of work). You can get different
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# stats by ignoring merge commits, once option parsing is implemented.
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#
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# Usage: ./committer_count.rb 2011-01-01 | head -10 # Since a particular date
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#        ./committer_count.rb 1y   | head -10       # Last year
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#        ./committer_count.rb 6m   | head -10       # Last six months
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#        ./committer_count.rb 12w  | head -10       # Last twelve weeks
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#        ./committer_count.rb 100d | head -10       # Last hundred days
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#
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#
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# History with colors and e-mail addresses (respecting .mailmap):
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# git log --pretty=format:"%C(white)%ad %C(yellow)%h %Cblue'%aN' <%aE> %Cgreen%f%Creset" --date=short
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#
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require 'time'
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class GitLogLine < Struct.new(:date, :hash, :author, :message)
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end
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@history = `git log --pretty=format:"%ad %h '%aN' %f" --date=short --date-order`
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@recent_history = []
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@commits_by_author = {}
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def parse_date(date)
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  case date
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  when /([0-9]+)y(ear)?s?/
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    seconds = $1.to_i* (60*60*24*365.25)
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    calc_date = (Time.now - seconds).strftime("%Y-%m-%d")
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  when /([0-9]+)m(onth)?s?/
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    seconds = $1.to_i* (60*60*24*(365.25 / 12))
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    calc_date = (Time.now - seconds).strftime("%Y-%m-%d")
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  when /([0-9]+)w(eek)?s?/
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    seconds = $1.to_i* (60*60*24*7)
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    calc_date = (Time.now - seconds).strftime("%Y-%m-%d")
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  when /([0-9]+)d(ay)?s?/
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    seconds = $1.to_i* (60*60*24)
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    calc_date = (Time.now - seconds).strftime("%Y-%m-%d")
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  else
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    calc_date = Time.parse(date).strftime("%Y-%m-%d")
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  end
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end
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date = ARGV[0] || "2005-03-22" # A day before the first SVN commit.
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calc_date = parse_date(date)
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@history.each_line do |line|
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  parsed_line = line.match(/^([^\s+]+)\s(.{7,})\s'(.*)'\s(.*)[\r\n]*$/)
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  next unless parsed_line
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  break if calc_date == parsed_line[1]
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  @recent_history << GitLogLine.new(*parsed_line[1,4])
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end
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@recent_history.each do |logline|
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  @commits_by_author[logline.author] ||= []
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  @commits_by_author[logline.author] << logline.message
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end
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puts "Commits since #{calc_date}"
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puts "-" * 50
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@commits_by_author.sort_by {|k,v| v.size}.reverse.each do |k,v|
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  puts "%-25s %3d" % [k,v.size]
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end
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