Re: [PATCH 2/2] [TopGit] Portability: Don't use alternation ("|") in sed regular expressions

From: Junio C Hamano <gitster@pobox.com>
Date: Mar 12, 2009, 06:55 UTC
Message-ID: <7viqmfjklm.fsf@gitster.siamese.dyndns.org>
In-Reply-To: <1236837389-35687-2-git-send-email-brian.p.campbell@dartmouth.edu>

Brian Campbell <brian.p.campbell@dartmouth.edu> writes:

> +current_branch()
> +{
> +	echo "$(git symbolic-ref HEAD | sed -e 's#^refs/heads/##' -e 's#^refs/top-bases/##')"
> +}

Two micronits.

 - what happens when you are on a detached HEAD?

 - You will be utterly confused by a local branch whose name is
   "refs/top-bases/foo"

To fix these, you might want to do something like:

	if head_=$(git symbolic-ref HEAD)
        then
                case "$head_" in
                refs/heads/*)
                        echo "${head_#refs/heads/}"
                        ;;
                refs/top-bases/*)
                        echo "${head_#refs/top-bases/}"
                        ;;
                *)
                        echo "$head_"
                        ;;
                esac
	else
        	whatever you want to do on a detached HEAD
	fi