Gather statistics on GIT projects regarding number of commits, lines of code (insertions/deletions), and files changed.

gitstats.rb

DATE="2013-10-28 00:00:00"
METRIC=:total_loc
TEAM=[
  'Team Member #1',
  'Team Member #2',
  'Team Member #3',
  # ...
]


def match_stat(str, stat)
  (str.match("(\\d+) #{stat}") or [])[1].to_i
end


stats = {}
TEAM.each do |member|
  print "."
  stats[member] = {
    files: 0,
    insertions: 0,
    deletions: 0,
    total_loc: 0,
    commits: 0,
  }
  logs = `git log --stat --since="#{DATE}" --author="#{member}" \| grep -e 'files\\?'`.split("\n")
  logs.each do |log|
    stats[member][:files]      += match_stat(log, 'file')
    stats[member][:insertions] += match_stat(log, 'insertions')
    stats[member][:deletions]  += match_stat(log, 'deletions')
    stats[member][:total_loc]  += match_stat(log, 'insertions') + match_stat(log, 'deletions')
    stats[member][:commits]    += 1
  end
end
puts

final_results = stats.sort_by { |member, results| results[METRIC] }.reverse
final_results.each do |member, results|
  puts member
  puts "#{"%4d" % results[:files]} files changed " +
       "#{"%4d" % results[:insertions]} insertions " +
       "#{"%4d" % results[:deletions]} deletions " +
       "#{"%4d" % results[:total_loc]} total lines of code " +
       "#{"%4d" % results[:commits]} commits "
end