#! /bin/sh

# $NetBSD: linkfarm.sh.in,v 1.4 2004/08/20 20:09:53 jlam Exp $

#
# Copyright (c) 2002 Alistair G. Crooks.  All rights reserved.
#
# 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.
# 3. All advertising materials mentioning features or use of this software
#    must display the following acknowledgement:
#	This product includes software developed by Alistair G. Crooks.
# 4. The name of the author may not be used to endorse or promote
#    products derived from this software without specific prior written
#    permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.

# set -x

prefix="@prefix@"
exec_prefix="@exec_prefix@"
sbindir="@sbindir@"

# set up program definitions
findprog="@FIND@"
grepprog="@GREP@"
lnprog="@LN@"
mkdirprog="@MKDIR@"
pkginfoprog="@sbindir@/pkg_info"
rmprog="@RM@"
rmdirprog="@RMDIR@"
sedprog="@SED@"
sortprog="@SORT@"

usage() {
	echo 'Usage: linkfarm [options] package'
	exit 1
}

version() {
	$pkginfoprog -V
	exit 0
}

checkdir() {
	if [ ! -d "$1" ]; then
		echo "linkfarm: \`$1' doesn't exist"
		exit 1
	fi
}

ignorefiles=${PLIST_IGNORE_FILES:-"info/dir *[~#] *.OLD *.orig *,v"}
linktype=-s

# default action: create a linkfarm in $target from $stowdir/$1
# i.e. linkfarm --target=${prefix}/${view} --dir=${prefix}/packages $1
#
doit=""
target=${LOCALBASE:-/usr/pkg}
stowdir=${target}/packages
subdir=""
verbose=0

# default action is to create
check=no
delete=no
create=yes

# process args - can't use getopt(1) because of '--' style args
while [ $# -gt 0 ]; do
	case "$1" in
	-D)		delete=yes; create=no ;;
	-R)		delete=yes; create=yes ;;
	-V)		version ;;
	-c)		check=yes; doit=":" ;;
	-d)		stowdir=$2; shift ;;
	-d*)		stowdir=`echo $1 | $sedprog -e 's|-d||'` ;;
	-s)		subdir=$2; shift ;;
	-s*)		subdir=`echo $1 | $sedprog -e 's|-s||'` ;;
	-t)		target=$2; shift ;;
	-t*)		target=`echo $1 | $sedprog -e 's|-t||'` ;;
	-n)		doit=":" ;;
	-v)		verbose=`expr $verbose + 1` ;;

	--delete)	delete=yes; create=no ;;
	--dir=*)	stowdir=`echo $1 | $sedprog -e 's|--dir=||'` ;;
	--restow)	delete=yes; create=yes ;;
	--subdir=*)	subdir=`echo $1 | $sedprog -e 's|--subdir=||'` ;;
	--target=*)	target=`echo $1 | $sedprog -e 's|--target=||'` ;;
	--version)	version ;;

	--)		shift; break ;;
	*)		break ;;
	esac
	shift
done

# set the package name
package=$1

# make sure stowdir has a full pathname
case $stowdir in
/*)	;;
*)	stowdir=`pwd`/$stowdir ;;
esac

# Set the directory from which we symlink.
case $subdir in
"")	fromdir=$stowdir/$package ;;
*)	fromdir=$stowdir/$package/$subdir ;;
esac

# Set the directory to which we symlink.
case $target in
/*)	todir=$target ;;
*)	todir=`pwd`/$target ;;
esac

# if we're checking the entries, check, then exit
case $check in
yes)
	checkdir $fromdir
	(cd $fromdir
	ex=0
	$findprog . ! -type d -print | \
	$sedprog -e 's|^\./||' | \
	while read f; do
		if [ -e $todir/$f ]; then
			ignore=no
			for i in $ignorefiles; do
				case $f in
				$i)	ignore=yes; break ;;
				esac
			done
			case $ignore in
			no)	
				echo "${f}"; ex=1 ;;
			esac
		fi
	done
	exit $ex) || exit 1
	;;
esac

# if we need to get rid of old linkfarms, do it
case $delete in
yes)	
	checkdir $fromdir
	(cd $fromdir
	$findprog . ! -type d -print | \
	$sedprog -e 's|^\./||' | \
	while read f; do
		ignore=no
		for i in $ignorefiles; do
			case $f in
			$i)	ignore=yes; break ;;
			esac
		done
		case $ignore in
		no)	
			if [ $verbose -gt 0 ]; then
				echo "$rmprog -f $todir/$f"
			fi
			$doit $rmprog -f $todir/$f ;;
		esac
	done
	$findprog . -type d -print | \
	$sedprog -e 's|^\./||' | \
	$sortprog -r | \
	while read d; do
		if [ $verbose -gt 0 ]; then
			echo "$rmdirprog $todir/$d"
		fi
		$doit $rmdirprog $todir/$d > /dev/null 2>&1
	done)
	;;
esac

# if we need to create new linkfarms, do it
case $create in
yes)
	checkdir $fromdir
	(cd $fromdir
	$findprog . -type d -print | \
	$sedprog -e 's|^\./||' | \
	while read d; do
		case "$d" in
		"")	continue ;;
		esac
		if [ $verbose -gt 0 ]; then
			echo "$mkdirprog -p $todir/$d"
		fi
		$doit $mkdirprog -p $todir/$d > /dev/null 2>&1
	done
	$findprog . ! -type d -print | \
	$sedprog -e 's|^\./||' | \
	while read f; do
		ignore=no
		for i in $ignorefiles; do
			case $f in
			$i)	ignore=yes; break ;;
			esac
		done
		case $ignore in
		no)
			if [ $verbose -gt 0 ]; then
				echo "$lnprog ${linktype} $fromdir/$f $todir/$f"
			fi
			$doit $lnprog ${linktype} $fromdir/$f $todir/$f ;;
		esac
	done)
	;;
esac

exit 0