pre-commit hook that checks syntax of changed files.

pre-commit

#!/usr/bin/env ruby

`git diff --cached --name-only --diff-filter=AM`.lines.each do |filename|
  path = File.join(Dir.pwd, filename.strip)
  puts "Checking syntax of #{ filename.strip }"
  case filename
  when /.haml$/
    exit 1 unless system('haml', '--check', path)
  when /.scss$/
    exit 1 unless system('scss', '--check', path)
  when /.rb$/
    exit 1 unless system('ruby', '-c', path)
  end
end