git function for bash prompt, adding current branch and untracked/new files

git_prompt.sh

    git_prompt () 
    { 
        # see [Setting color on git status in bash prompt - Stack Overflow](http://stackoverflow.com/questions/24837340/setting-color-on-git-status-in-bash-prompt)
        if [ $(git rev-parse --is-inside-work-tree &>/dev/null; printf "%s" $?) == 0 ]
        then
            local GIT_PROMPT="${RESET}(${DIM}g${RESET}|"
            git_branch () { git branch 2>/dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/\1/'; }
            # assemblate status statistic,substitute ? with U
            git_status () { git status --porcelain 2>/dev/null | cut -c 1-2 | sort | uniq -c | sed 's/  *//;s/  */:/;s/\?/U/g' | paste -sd "|" -; }

           if [ "$(git_status)" != "" ]
           then
               local GIT_BRANCH="$RED$(git_branch)$RESET"
               local GIT_PROMPT=$GIT_PROMPT$GIT_BRANCH
               local GIT_STATUS="|"$RED$(git_status)$RESET
               local GIT_PROMPT=$GIT_PROMPT$GIT_STATUS
           else
               local GIT_BRANCH="$GREEN$(git_branch)$RESET"
               local GIT_PROMPT=$GIT_PROMPT$GIT_BRANCH
           fi

            local GIT_PROMPT=$GIT_PROMPT")"
        else
            local GIT_PROMPT=""
        fi
        echo -n $GIT_PROMPT
    }