branch.rb

# encoding: utf-8
branches = STDIN.read.chomp
if !branches.empty?
  branch = branches.split("\n").map(&:strip)[0].split(' ').map(&:strip)[-1]
  second_line = branches.split("\n").map(&:strip)[1]
  is_clean = second_line == "nothing to commit, working directory clean"
  if !branches.empty?
    if is_clean
      puts " ✓ #{branch}"
    else
      puts "\e[0;31m ✗ #{branch}"
    end
  end
end

if you change line 11 to

  puts "\e[0;31m" + " ✗ #{branch}"

it'll be red and more visible.

WORD

With git version 2.5.3. I had to modify this slightly to be

last_line = branches.split("\n").map(&:strip).last
is_clean = last_line == "nothing to commit, working directory clean"

hey @gdomingu , thanks! I know this is 3 years late, but this little ruby script is awesome, and I was wondering why it stopped working :)