git status in prompt function

git_status_in_function.sh

#!/bin/bash

get_git_status() {
        git_status=$(git status -s -u -v 2>/dev/null)
        if [[ -z "$git_status" ]]; then return 0; fi
        modified=$(echo "$git_status" | grep '^ M ' | wc -l)
        deleted=$(echo "$git_status" | grep '^ D ' | wc -l)
        untracked=$(echo "$git_status" | grep '^?? ' | wc -l)
        echo "(~$modified -$deleted +$untracked) "
}