Changelog Generator

gistfile1.rb

#!/usr/bin/env ruby

# Changelog Generator
# Right now, this is date-based.
# TODO: Changelog between two Tags, eg: --tags=1.0.0..1.0.1

from_date = ARGV[0] 

cmd = `git log --no-merges --since='#{from_date}' --pretty='format:%ci::%an <%ae>::%s'`.split /\n/
 
list = {}
list_order = []
 
cmd.each do |l|
  date, author, subject = l.chomp.split('::')
  date, time, zone = date.split(' ')
 
  id = "#{date}"
  if not list[id]
    list[id] = []
    list_order << { :id => id, :value => list[id] }
  end
  list[id] << subject
end
 
File.open('CHANGELOG', 'w+') do |f|
  list_order.each do |changelog|
    id = changelog[:id]
    value = changelog[:value]
    f.puts "#{id}"
    f.puts value.map { |e| "  * #{e}" }.join("\n")
    f.puts "\n"
  end
  f.puts "Generated: #{Time.now}"
end