#!/bin/sh -e
#
# Copyright (C) 2016  Alexey Gladkov <legion@altlinux.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#

. /usr/lib/rpm/functions
[ $# -eq 1 ] && [ -n "$1" -a -z "${1##/*}" ] ||
	{ ArgvFileAction "$0" "$@"; exit; }

#set -x
file="$1"

GOCODE="/usr/share/gocode"
GOROOT="$(go env GOROOT)"

export GOPATH="$GOROOT:$GOCODE${RPM_BUILD_DIR:+:$RPM_BUILD_DIR$GOCODE}${GOPATH:+:$GOPATH}"

for prefix in "$GOCODE" "$GOROOT"; do
	[ -z "${file##$prefix/src/*}" ] ||
		continue

	import_path="${file##$prefix/src/}"
	import_path="${import_path%/*.go}"

	go list -f 'standard={{.Standard}} {{.Imports}}' "$import_path" |
		sed -n -e 's,^standard=false \[\(.*\)\],\1,p' |
		tr ' ' '\n' |
	while read m; do
		standard="$(go list -f '{{.Standard}}' "$m" 2>/dev/null)" &&
			[ "$standard" != "true" ] ||
			continue

		found=
		c="$import_path"
		while [ -z "${c##*/*}" ]; do
			if [ "$c" = "$m" -o -z "${m##$c/*}" ]; then
				found=1
				break
			fi
			c="${c%/*}"
		done

		[ -n "$found" ] ||
			echo "golang($m)"
	done
done
