gistfile1.rb

#!/usr/bin/ruby

require 'net/smtp'

FROM     = "noc@example.com"
DOMAIN   = "example.com"
ACCOUNT  = "gmail.account@example.com"
PASSWORD = "secret"

def current_commit
  pipe = IO.popen("git log")
  commit = pipe.gets
  pipe.close
  return commit.split.last
end

def previous_commit
  fh = File.new('/tmp/git.last', 'r')
  commit = fh.read.chomp
  fh.close
  return commit
end

def log_current_commit
  fh = File.new('/tmp/git.last', 'w')
  fh.write current_commit
  fh.close
end

def get_changes(previous_commit, current_commit)
  puts "git log #{previous_commit}..#{current_commit}"
  pipe = IO.popen("git log #{previous_commit}..#{current_commit}")
  data = pipe.readlines
  pipe.close
  return data.to_s
end

def send_email(to, body, opts={})
  msg = "Subject: WENTLIVE (app.example.com)\n\n#{body}"
  smtp = Net::SMTP.new 'smtp.gmail.com', 587
  smtp.enable_starttls
  smtp.start(DOMAIN, ACCOUNT, PASSWORD, :login) do
    smtp.send_message(msg, FROM, to)
  end
end

arg = ARGV[0]

if arg == 'log_current_commit'
  log_current_commit
elsif arg == 'email_change_manifest'
  current = current_commit
  previous = previous_commit
  send_email('all@example.com', get_changes(previous, current))
end