Add git branch on bash prompt

git .bashrc

#!/bin/sh

parse_git_branch () {
    git name-rev HEAD 2> /dev/null | sed 's#HEAD\ \(.*\)# (git::\1)#'
}

 
RED="\[\033[0;31m\]"
YELLOW="\[\033[0;33m\]"
GREEN="\[\033[0;32m\]"
NO_COLOUR="\[\033[0m\]"
 
PS1="$GREEN\u-MBA$NO_COLOUR:\w$YELLOW\$(parse_git_branch)$NO_COLOUR\$ "