#!/bin/sh
#
# $NetBSD: pkg_path,v 1.5 2018/08/22 20:48:37 maya Exp $
#
# Copyright (c) 2006 The NetBSD Foundation, Inc.
# All rights reserved.
#
# This code is derived from software contributed to The NetBSD Foundation
# by Johnny C. Lam.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#

######################################################################
#
# NAME
#	pkg_path -- canonicalize directories into "package paths"
#
# SYNOPSIS
#	pkg_path [-s pkgsrcdir] dir ...
#
# OPTIONS
#	The following command line arguments are supported.
#
#	-s pkgsrcdir	Use the specified directory as the path to the
#			pkgsrc directory tree.  By default, this is the
#			value stored in the PKGSRCDIR environment variable.
#
# DESCRIPTION
#	pkg_path canonicalizes the specified directories into package
#	paths that are relative to the pkgsrc directory tree, and prints
#	each of them to standard output on a new line.  The specified
#	directories are taken to be relative to the current directory.
#	Directories that are not valid package directories or are not
#	found are skipped during processing.
#
# ENVIRONMENT
#	PKGSRCDIR	This is the location of the pkgsrc directory tree,
#			which defaults to "/usr/pkgsrc".
#
######################################################################

: ${ECHO=echo}
: ${PKGSRCDIR="/usr/pkgsrc"}
: ${PWD_CMD="pwd -P"}

self="${0##*/}"

usage() {
	${ECHO} 1>&2 "usage: $self [-s pkgsrcdir] dir ..."
}

exitcode=0

# Process optional arguments
while [ $# -gt 0 ]; do
	case "$1" in
	-s)	PKGSRCDIR=$2; shift 2 ;;
	--)	shift; break ;;
	-*)	${ECHO} 1>&2 "$self: unknown option -- ${1#-}"
		usage
		exit 1
		;;
	*)	break ;;
	esac
done

# Process required arguments
startdir=`${PWD_CMD}`
while [ $# -gt 0 ]; do
	dir="$1"; shift
	case "$dir" in
	${PKGSRCDIR}/*)	;;
	/*)	 ${ECHO} 1>&2 "$self: \`\`$dir'' not a valid package directory"
		exitcode=1
		continue
		;;
	esac
	if [ ! -d "$startdir/$dir" ]; then
		${ECHO} 1>&2 "$self: \`\`$dir'' not found"
		exitcode=1
		continue
	fi
	pkgpath=`cd $startdir/$dir && ${PWD_CMD}`
	pkgpath="${pkgpath#${PKGSRCDIR}/}"
	${ECHO} "$pkgpath"
done

exit $exitcode