[PATCH] Update git-sh-setup(1) to allow transparent use of git-parseopt(1)

[Pierre Habouzit <madcoder@debian.org>]

If you set OPTIONS_SPEC, git-sh-setups uses git-parseopt automatically.
It also diverts usage to re-exec $0 with the -h option as parse-options.c
will catch that.

PARSEOPT_OPTS can also be used to pass options git git-parseopt(1) (like
--keep-dashdash).
---
 git-sh-setup.sh |   44 ++++++++++++++++++++++++++------------------
 1 files changed, 26 insertions(+), 18 deletions(-)

diff --git a/git-sh-setup.sh b/git-sh-setup.sh
index 86d7d4c..d7b13e0 100755
--- a/git-sh-setup.sh
+++ b/git-sh-setup.sh
@@ -16,9 +16,32 @@ die() {
 	exit 1
 }
 
-usage() {
-	die "Usage: $0 $USAGE"
-}
+if test -n "$OPTIONS_SPEC"; then
+	usage() {
+		exec "$0" -h
+	}
+
+	eval `echo "$OPTIONS_SPEC" | git parseopt $PARSEOPT_OPTS -- "$@" || echo exit $?`
+else
+	usage() {
+		die "Usage: $0 $USAGE"
+	}
+
+	if [ -z "$LONG_USAGE" ]
+	then
+		LONG_USAGE="Usage: $0 $USAGE"
+	else
+		LONG_USAGE="Usage: $0 $USAGE
+
+$LONG_USAGE"
+	fi
+
+	case "$1" in
+		-h|--h|--he|--hel|--help)
+		echo "$LONG_USAGE"
+		exit
+	esac
+fi
 
 set_reflog_action() {
 	if [ -z "${GIT_REFLOG_ACTION:+set}" ]
@@ -91,21 +114,6 @@ get_author_ident_from_commit () {
 	LANG=C LC_ALL=C sed -ne "$pick_author_script"
 }
 
-if [ -z "$LONG_USAGE" ]
-then
-	LONG_USAGE="Usage: $0 $USAGE"
-else
-	LONG_USAGE="Usage: $0 $USAGE
-
-$LONG_USAGE"
-fi
-
-case "$1" in
-	-h|--h|--he|--hel|--help)
-	echo "$LONG_USAGE"
-	exit
-esac
-
 # Make sure we are in a valid repository of a vintage we understand.
 if [ -z "$SUBDIRECTORY_OK" ]
 then
-- 
1.5.3.5.1458.g2aa13-dirty