Quick stats per user on number of lines added/removed per commit

gitlinestat.rb

#!/usr/bin/env ruby

# A simple script to get stats on number of lines added/removed per commit
# Accepts -v option for verbose mode
# Accepts other git options, in particular path.
#
# E.g.:
#
#   linestat -v app lib

ARGV.unshift "--author=#{`git config user.email`.strip}" unless ARGV.any?{|a| a.start_with? '--author='}
verbose = ARGV.delete('-v')

data = `git log --oneline --shortstat --reverse --no-merges #{ARGV.join(' ')}`.lines.each_slice(2).map do |commit, changes|
  _, plus, minus = *changes.match(/.*changed, (\d+) insertions.* (\d+) deletions/)
  [commit, plus.to_i, -minus.to_i]
end

exclude = File.read('tmp/.ignore_commits') rescue ''
errors = exclude.split("\n").map do |skip|
  n = data.size
  data.delete_if{|commit, _, _| commit.include?(skip)}
  case n -= data.size
  when 1
  when 0
    "Didn't find commit '#{skip}'" if ARGV.size <= 1
  else
    "Commit '#{skip}' matched #{n} commits"
  end
end.compact

deltas = data.map do |commit, plus, minus|
  puts ("%4d %5d = %5d  " % [plus, minus, plus + minus]) + commit if verbose
  plus + minus
end
deletions = deltas.select{|d| d < 0}.inject(0, :+)
sum = deltas.inject(0, :+)
#plus, minus = data.transpose.last(2).map{|serie| serie.inject(:+)}
puts "#{sum-deletions} #{deletions} = #{sum}"
puts "Errors: #{errors}" unless errors.empty?

This didn't work for me...
but I used you git log line and did what I needed with a chain of pipes

https://gist.github.com/mathieujobin/92f6b671abd7d3aa552b