git hub-diff - a command line utility for generating diffs on github

git-hub-diff

#!/usr/bin/env ruby
#
# Usage:
# cd /git/project/directory
# git hub-diff 223d60f5486075e74851075fcfeb366d45c17d8b 13c86f00cbfe820c415b46bfd19268284db2a274
# Future features:
# * generate SHAs from refs
# * launchy support

require 'rubygems'
require 'git'
require 'uri'

repo = Git.open(Dir.pwd)
github = repo.remotes.find { |r| r.url =~ /github/ }
http_uri = github.url.sub(/(.*)github\.com/,'http://github.com').
                      sub(/\.git$/,'').
                      sub(/github\.com:/,'github.com/')

from = ARGV[0]
# Compare to HEAD if "to" ref is omitted.
to = ARGV[1] || repo.revparse('HEAD')

exec("open #{http_uri}/compare/#{from}...#{to}")