#!/bin/sh

# srctree.sh: support for out-of-tree builds in posix make mode.

# this file is covered by COPYING.SOFORT.

set -eu

usage()

{

cat << EOF >&2

Usage:

  --help              show this HELP message

  --srctree=SRCTREE   set source directory

EOF

exit 1

}

# one

workdir=$(pwd -P)

srctree=

argloop=

for arg ; do

	case "$arg" in

		--help)

			usage

			;;

		--srctree=*)

			srctree=${arg#*=}

			;;

		--)

			argloop='done'

			;;

		*)

			if [ -z "$argloop" ]; then

				printf 'Invalid option: %s\n' "$arg" >&2

				usage

			fi

			;;

	esac

done

# two

if [ -z "$srctree" ] ; then

	usage

fi

cd -- "$srctree"

srctree=$(pwd -P)

cd -- "$workdir"

if [ "$srctree" = "$workdir" ]; then

	exit 0

fi

# three

for arg ; do

	case "$arg" in

		--srctree=*)

			;;

		--)

			;;

		*)

			stat "$arg" > /dev/null 2>&1 \

				|| ln -s -- "$srctree/$arg" "$arg"

			;;

	esac

done

# all done

exit 0