#!/usr/bin/env ruby

require 'rubocop'

changed_files = `git diff --name-only --cached`.split(/\n/).
    select { |file_name|
      file_name.end_with?(".rb") ||
        file_name.match?(/^Gemfile/)
    }.join(' ')

`git stash --keep-index`
system("bundle exec rubocop -c .rubocop.yml '#{changed_files}'") unless changed_files.empty?
exit_status = $CHILD_STATUS.exitstatus
`git stash pop`

exit exit_status