my focus prevention pre-commit hook

pre-commit

#!/usr/bin/env ruby
# vim: set syntax=ruby

begin
  require 'colorize'
rescue LoadError
  class String
    def fake_color(*)
      self
    end
    alias underline fake_color
    alias yellow fake_color
    alias red fake_color
  end
end
require 'stringio'

flag = false
buffer = StringIO.new
 
files = `git diff --cached --name-only --diff-filter=ACM | grep "_spec\.rb$"`.split("\n")
files.each do |file|
  results = `git diff --cached  #{file} | grep "^\+[^+]"`.split("\n").grep(/(describe|it|example|specify|context)\b.*focus/).map { |r| r.sub(/^\+[\s\t]*/, '') }
  if results.length > 0
    buffer.puts '', 
      file.to_s.underline.yellow,
      results.map { |r| `grep -n #{Regexp.escape(r).inspect} #{file}`}
    flag = true
  end
end

if flag
  puts "Please remove :focus from your tests before committing:".red

  buffer.rewind
  print buffer.read
 
  exit 1
end