#!/bin/sh
#
# This scripts checks the given list of packages if they have
# reverse dependencies (i.e. there are packages which depends on them).
# Dependencies that are on the list are excluded.
#
# Usage: $0 LIST
set -eu

SCRIPT_DIR="$(dirname "$(readlink -f "$0")")"

find_revdeps() {
       	local pkgname="$1"
       	local excludes="$2"

       	"$SCRIPT_DIR"/abuild-revdeps $pkgname \
       		| xargs -I% "$SCRIPT_DIR"/abuild-origin % \
       		| grep -vFf "$excludes" \
       		| sort | uniq
}

has_maintainer() {
       	local pkgname="$1"
       	local abuild="$pkgname/APKBUILD"

       	if [ -f "$abuild" ]; then
       		grep -qE '# Maintainer: *\w+' "$abuild"
       	else
       		echo "ERROR: $abuild does not exist!" >&2
       	fi
}

mark_unmaintained() {
       	local pkg; for pkg in $@; do
       		if has_maintainer $pkg; then
       			printf "%s " $pkg
       		else
       			printf "%s* " $pkg
       		fi
       	done
}


pkglist="$1"

echo '# PKGNAME <- list of packages that (make)depends on PKGNAME' >&2

cat "$pkglist" | while read pkgname; do
       	revdeps="$(find_revdeps "$pkgname" "$pkglist")"

       	if [ -n "$revdeps" ]; then
       		printf "%s <- %s\n" "$pkgname" "$(mark_unmaintained $revdeps)"
       	fi
done

echo ''
echo '* package without a maintainer' >&2