#!/bin/sh

if [ "$1" = "-q" ] ; then
	quiet=1
	shift
fi

PATCH=${PATCH:-patch}

patchdir=${1:?You must supply a patches directory}
sourcedir=${2?:You must supply a source directory}

if [ ! -d "$patchdir" ] ; then
	echo "$patchdir is not a directory" >&2
	exit 1
fi

if [ ! -d "$sourcedir" ] ; then
	echo "$sourcedir is not a directory"  >&2
	exit 1
fi

# Patterns used in filename expansion (globs) are sorted according to the
# current locale, so there is no need to do it explicitly.
for patchfile in "$patchdir"/*.patch ; do
	# A glob that doesn't match is not replaced, so we handle that here. We
	# should only fail this test if there are no patch files.
	[ -f "$patchfile" ] || {
		echo "No patches in $patchdir" >&2
		exit 0
	}

	[ -z "$quiet" ] && echo "Applying patch $(basename "$patchfile")"
	${PATCH} -d "$sourcedir" -p1 -i "$patchfile" >/dev/null || exit 1
done

exit 0