ps1.sh

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

function color_git_branch {
    # '$1' represents the first variable passed to the script
    if [[ "x$1" = "x" ]]; then
        echo -e "$1"
    else
        local status="$(git status 2> /dev/null | tail -n1)"
        if [[ $status == "nothing to commit, working tree clean" ]]; then
            # Non-printable chars (color escape sequences, etc.) must be escaped
            # in order for bash to keep track of the cursor position
            # \001 and \002 replace escaped brackets inside of `echo -e`
            echo -e '\001\033[0;32m\002'"$1"'\001\033[0m\002'  # green + clear
        else
            echo -e '\001\033[0;31m\002'"$1"'\001\033[0m\002'  # red + clear
        fi
    fi
}
export PS1='$(basename $(pwd))[\[$(color_git_branch $(parse_git_branch))\]] '