calculate days of work by developer from git repo

git_work_by_day.rb

#
# In git project folder run 
#   git log > log.txt
#
# then
#   ruby git_work_by_day.rb
#
# Sample result:
#
# Fri Feb 20 => Mike Smith, Bob Jones
# Thu Feb 19 => Bob Jones, Tom Doe
# Wed Feb 18 => Tom Doe
#

log = File.read('log.txt')

works = {}

log.lines.each do |line|
  md = line.match(/\(([\w\s]+)\).*([A-Z]\w{2}\s[A-Z]\w{2}\s\d+)/)
  name = md[1]
  date = md[2]

  works[date] = [] if works[date].nil?
  works[date] << name
  works[date] = works[date].uniq
end

works.each do |date, names| 
	puts "#{date} => #{names.join(', ')}"
end