A minimalistic-colored-git-enabled bash prompt: gitdir ? "myproject:mybranch> " : "> "

git-prompt.sh

#!/usr/bin/env bash
# coding: utf-8

# PROMPT

# more compact
# export PS1="\u@\h\w$ "
# export PS1=">: "                  # LOST style
# export PS1='> '                   # Terminal Icon style

# Colored Terminal Icon style, with git project and branch when in git dir
# the $'...' solution prevents readline from messing up when walkin history:
# ( See:
#   http://forums.macosxhints.com/showthread.php?t=90387
#   
#   $'...' instead of "...", to force \e to expand to ESC. It's a bash option 
#   whether that expansion happens inside "...", and it's usually safer if it 
#   doesn't, to guard against filenames containing escape sequences."
# )

red=$'\[\e[31m\]'
green=$'\[\e[32m\]'
yellow=$'\[\e[33m\]'
clear=$'\[\e[0m\]'

function git_branch {
	if gitdir=`git show-git-dir` && test -f "$gitdir/.git/HEAD"
	then
		git_head=`cat $gitdir/.git/HEAD`
		git_head="${git_head#ref\: refs\/heads\/}"
		git_sha=`git rev-parse --short $git_head`
		match=`expr $git_head : $git_sha`
		# If git_ref contains git_sha then use sha which is shorter
		if test $match = '0'
		then
			echo -n ":"$git_head
		else
			echo -n ":"$git_sha
		fi
	fi
}

function git_dir {
	gitdir=`git show-git-dir` && test -f "$gitdir/.git/HEAD" && basename "$gitdir"
}

export PS1="$red\$(git_dir)$green\$(git_branch)$yellow>$clear "



# To include this custom prompt put this file in "~/bin/" and and put the 
# following lines in "~/.profile".
# 
# # Include Custom prompt
# . ~/bin/custom-prompt.sh