Bash git prompt

# Show uncommitted files
function parse_git_dirty {
    [[ $(/usr/bin/git status 2> /dev/null | tail -n1) != "nothing to commit, working directory clean" ]] && echo "*"
}

# Returns "|s:N" where N is the number of stashed states (if any).
function parse_git_stash {
    local stash=`expr $(/usr/bin/git stash list 2>/dev/null| wc -l)`
    if [ "$stash" != "0" ]
    then
        echo "|s:$stash"
    fi
}

# Get the current git branch name (if available)
git_prompt() {
    local ref=$(/usr/bin/git symbolic-ref HEAD 2>/dev/null | cut -d'/' -f3)
    if [ "$ref" != "" ]
    then
        echo "($ref$(parse_git_dirty)$(parse_git_stash)) "
    fi
}

# Show host, cwd and git status
PS1="$PS1PREFIX\h:\w\$(git_prompt)$ "