Re: Improve "git grep" flags handling

[Junio C Hamano <junkio@cox.net>]

Linus Torvalds <torvalds@osdl.org> writes:

> Good point. However, since it's unlikely that anybody will use it, maybe 
> it's not important - more of a "this is how you could do it if you fixed 
> the globbing problem" ;)

Yeah, let's see how tolerant your barf-o-meter is today.  This
would make even *me* barf ;-), but it sometimes may be useful to
be able to say:

    git grep --others --exclude='*.[oa]' '@@GIT_'

------------
#!/bin/sh

# git grep <flags>... <pattern> <path>...

{
    # Pick ls-files arguments only.
    first=yes skip=no pattern_found=no
    for x
    do
	case "$skip" in yes) skip=no; continue ;; esac 
    	case "$x" in
	--cached|--deleted|--others|--killed|--ignored|--exclude=*|\
	--exclude-from=*|\--exclude-per-directory=*)
		test 'yes' = "$first" && set x
		set "$@" "$x"
		first=no
		;;
	-A|-B|-C|-D|-d|-f|-m)
		skip=yes
		;;
	-e)
		skip=yes
		pattern_found=yes
		;;
	-*)
		;;
	*)
		case "$pattern_found" in
		yes)
			test 'yes' = "$first" && set x
			set "$@" "$x"
			;;
		no)
			;; # not for us, but for grep
		esac
		;;
	esac
    done
    case "$first" in
    yes) # we did not get *any* ls-files parameter.
    	set x ;;
    esac
    shift
    git-ls-files -z "$@"
} | {
    first=yes eat=no pattern_found=no
    for x
    do
	case "$eat" in
	yes)
		eat=no;
		set "$@" "$x"
		continue
		;;
	esac 
    	case "$x" in
	--cached|--deleted|--others|--killed|--ignored|--exclude=*|\
	--exclude-from=*|\--exclude-per-directory=*)
		;;
	-A|-B|-C|-D|-d|-f|-m)
		test 'yes' = "$first" && set x
		set "$@" "$x"
		first=no
		eat=yes
		;;
	-e)
		test 'yes' = "$first" && set x
		set "$@" "$x"
		eat=yes
		pattern_found=yes
		;;
	-*)
		test 'yes' = "$first" && set x
		set "$@" "$x"
		first=no
		;;
	*)
		case "$pattern_found" in
		yes)
			;; # not for us, but for ls-files
		no)
			test 'yes' = "$first" && set x
			set "$@" "$x"
			pattern_found=yes
		esac
		;;
	esac
    done
    case "$eat,$pattern_found" in
    yes,* | *,no)
    	echo >&2 "* malformed grep parameters"
	exit 1
    esac
    shift
    xargs -0 grep "$@"
}