Bash prompt with git branch and dirty detection

bash-prompt.sh

# Add the lines to your .bashrc

# color definitions
r_red="\e[0;31m"
r_grn="\e[0;32m"
b_wht="\e[1;37m"
b_cyn="\e[1;36m"
b_red="\e[1;31m"
b_blu="\e[1;34m"
b_ylw="\e[1;33m"
b_pur="\e[1;35m"
rst="\e[0m"

# check if git is dirty
function is_git_dirty() {
    local status=$(git status --porcelain 2> /dev/null)

    if [ "$status" != "" ]; then
        echo "*"
    else
        echo ""
    fi
}

# get current branch
function get_git_branch() {
    local branch=`git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/\1/'`
    local dirty

    if [ ! "${branch}" == "" ]; then
        dirty=`is_git_dirty`
        echo -e "${b_wht}[${r_grn}${branch}${r_red}${dirty}${b_wht}]"
    else
        echo ""
    fi
}

export PS1="\[${b_wht}\][ \[${b_red}\]\u\[${b_ylw}\]@\[${b_cyn}\]\h \[${b_ylw}\]\w \`get_git_branch\` \[${b_wht}\]] \[${b_pur}\]#\[${rst}\]"