gistfile1.rb

#!/usr/local/bin/ruby

# Usage:
#
# $ build.rb http://yoururl.com/your_project/push
#
# $ echo "HEAD -1 refs/heads/master" | build.rb http://yoururl.com/your_project/push
#
# or you can hard-code the URL in the following line instead
# of passing it as an argument.

url = ARGV.pop

#######################################################################
##                                                                   ##
## == DON'T EDIT ANYTHING BELOW UNLESS YOU KNOW WHAT YOU'RE DOING == ##
##                                                                   ##
#######################################################################

require 'net/http'
require 'uri'

old_head, new_head, ref = $stdin.gets.split unless $stdin.tty?

old_head = old_head ? "^#{old_head}" : "-1"
new_head ||= "HEAD"
ref ||= "refs/heads/master"

revisions = `git rev-list --pretty=oneline #{new_head} #{old_head} | awk '{print $1}'`.split("\n")
revisions.map! {|r| %Q({"id":"#{r}"}) }.join(",")

payload = %Q({"ref":"#{ref}", "commits":[#{revisions}]})

puts Net::HTTP.post_form(URI.parse(url), {
  :payload => payload
})