#! /bin/sh
# $OpenBSD: show-reverse-deps,v 1.10 2020/06/11 19:55:15 espie Exp $
#
# Copyright (c) 2018 Marc Espie <espie@openbsd.org>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

# compute reverse dependencies
# XXX this is not perfect yet! it *does* require collating lib-depends over
# multi-packages setup, which this is NOT doing yet, but it is close to
# actually doing it.
# we just require a few more views for that.

usage="Usage: show-reverse-deps [-ftv] [-d sqlite_db] pkgpath"
args=`getopt d:ftv $*`
if [ $? -ne 0 ]
then
    echo 2>&1 $usage
fi
set -e

db=${TRUEPREFIX}/share/sqlports
type_root="root.type!=3"
type_child="child.type!=3"
fuzzy=false
verbose=false

set -- $args
while [ $# -ne 0 ]
do
	case "$1" in
		-d)
			db="$2"
			shift
			shift
			;;
		-f)
			fuzzy=true
			shift
			;;
		-t)
			type_root=true
			type_child=true
			shift
			;;
		-v)
			verbose=true
			shift
			;;
		--)
			shift
			break
			;;
	esac
done

if [ $# -ne 1 ]
then
	echo 2>&1 $usage
	exit 1
fi

if $fuzzy
then
	query="p2.fullpkgpath like \"%$1%\""
else
	query="p2.fullpkgpath=\"$1\""
fi
if $verbose
then
	adj=", _paths2.fullpkgpath, case d.type when 0 then 'LIB_DEPENDS' when 1 then 'RUN_DEPENDS' when 2 then 'BUILD_DEPENDS' when 3 then 'TEST_DEPENDS' end"
	join_adj="join _paths _paths2 on _paths2.id=d.dependspath"
else
	adj=""
	join_adj=""
fi

sqlite3 "$db" <<EOSQL
with recursive d (fullpkgpath, dependspath, type) as
	(select root.fullpkgpath, root.dependspath, root.type
		from _canonical_depends root
			join _paths 
			    on root.dependspath=_paths.canonical
			join _paths p2 
			    on $query and p2.id=_paths.pkgpath
			where $type_root
	    union
	    select child.fullpkgpath, child.dependspath, child.type
	    from d parent, _canonical_depends child  
	    	where parent.fullpkgpath=child.dependspath and $type_child)
select distinct _paths.fullpkgpath $adj from d 
    join _paths 
	on _paths.id=d.fullpkgpath
    $join_adj
order by _paths.fullpkgpath $adj;
EOSQL