git pre-receive hooks

gistfile1.rb

#!/usr/bin/env ruby

old_sha, new_sha, ref = STDIN.read.split(' ')

diff = %x{ git diff --raw --name-only #{old_sha} #{new_sha} 2> /dev/null }

diff.each_line do |line|
  file = line.chomp
  next unless file =~ /\.rb\Z/i

  tree = %x{ git ls-tree --full-name #{new_sha} #{file} 2> /dev/null }.split(" ")

  contents = %x{ git cat-file blob #{tree[2]} 2> /dev/null }

  if found = contents.each_line.map(&:chomp).find{ |e| e =~ /\s+\Z/ }
    puts <<EOF
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> !!!!!!!!! PUSH REJECTED !!!!!!!!!
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
> REMOVE TRAILING WHITESPACE.
>  * #{tree[3]}
>
>  #{found.inspect}
>
> YOU SHOULD SEE ALSO:
>  * http://keijinsonyaban.blogspot.com/2011/01/git.html
>  * http://shugo.net/ruby-codeconv/codeconv.html
>  * http://www.rubyist.net/~matz/20041006.html#p02
>  * http://labs.nayutaya.jp/?ruby-coding-standards
>
> To fix:
>  * Ammend previous commit (git add && git commit --amend)
>  * git push
>
> Cheer!
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
EOF
    exit 1
  end
end
exit 0