better bash prompt with git branch

bashprombt

#source: http://asemanfar.com/Current-Git-Branch-in-Bash-Prompt

c_cyan=`tput setaf 6`
c_red=`tput setaf 1`
c_green=`tput setaf 2`
c_sgr0=`tput sgr0`
   
parse_git_branch ()
{
  if git rev-parse --git-dir >/dev/null 2>&1
  then
          gitver=$(git branch 2>/dev/null| sed -n '/^\*/s/^\* //p')
  else
          return 0
  fi
  echo -e $gitver
}

branch_color ()
{
        if git rev-parse --git-dir >/dev/null 2>&1
        then
                color=""
                if git diff --quiet 2>/dev/null >&2 
                then
                        color="${c_green}"
                else
                        color=${c_red}
                fi
        else
                return 0
        fi
        echo -ne $color
}
 
PS1='[\[$(branch_color)\]$(parse_git_branch)\[${c_sgr0}\]] \u@\[${c_red}\]\w\[${c_sgr0}\]: '