show git branch and dirty state in bash prompt

pretty_shell.sh

#!/bin/bash

parse_git_branch() {
    git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/\1/';
}

parse_git_dirty() {
        [[ ! $(git status) =~ "nothing to commit (working directory clean" ]] && echo " ⚡ "
}
export PS1='\[\033[01;30m\] [$(parse_git_branch)\[\033[01;33m\]$(parse_git_dirty)\[\033[01;30m] \[\033[00m\]'$PS1
export LESS="$LESS -R"