Show the git branch in bash prompt

bash_profile_git_branch.sh

function parse_git_branch {
  ref=$(git symbolic-ref HEAD 2> /dev/null) || return
  echo "("${ref#refs/heads/}")"
}

GREEN="\[\033[01;32m\]"
WHITE="\[\033[00m\]"
BLUE="\[\033[01;34m\]"
YELLOW="\[\033[0;33m\]"

PS1="$GREEN\u@\h$WHITE:$BLUE\w $YELLOW\$(parse_git_branch)$WHITE\$ "