#!/bin/sh -efu
### This file is covered by the GNU General Public License
### version 2 or later.
###
### Copyright (C) 2019  ALT Linux Team
### Author: Leonid Krivoshein <klark@altlinux.org>

prefix="___vxZZZy275___"
grubmenu="$(mktemp -q "${TMPDIR-/tmp}/grubmenu-XXXXXXXX.tmp")"

cat "$1" | sed \
	-re "s/^[[:space:]]*menuentry[[:space:]]+'([^']+)'.*\$/${prefix}M:	\1/g" \
	-re "s/^[[:space:]]*submenu[[:space:]]+'([^']+)'.*\$/${prefix}S:	\1/g" \
	-re "s/^[[:space:]]*}[[:space:]]*\$/${prefix}E:	-/g" \
	-re '/^'${prefix}'[MSE]:/!d' \
	-re "s/^${prefix}M:/M/g" \
	-re "s/^${prefix}S:/S/g" \
	-re "s/^${prefix}E:/E/g" > "$grubmenu"

prefix=
entry=0
while read mode title
do
	case "$mode" in
	M)	echo "${prefix}${title}"
		entry=1
		;;
	S)	prefix="${prefix}${title}>"
		;;
	*)	if [ $entry -ne 0 ]; then
			entry=0
		elif [ -n "$prefix" ]; then
			prefix="${prefix%>}"
			case "$prefix" in
			*">"*)	prefix="${prefix%>*}";;
			*)	prefix=;;
			esac
		fi
		;;
	esac
done < "$grubmenu"
rm -f "$grubmenu"