#!/bin/sh
#
# 2019 Dennis Camera (dennis.camera at ssrq-sds-fds.ch)
#
# This file is part of cdist.
#
# cdist 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 3 of the License, or
# (at your option) any later version.
#
# cdist 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 cdist. If not, see <http://www.gnu.org/licenses/>.
#
#
# Check if the given editor is present on the target system and determine its
# absolute path.
#

case $("${__explorer}/os")
in
	debian|devuan|ubuntu)
		:  # supported
		;;
	*)
		exit 0  # will produce an error message in the manifest
		;;
esac


editor=$(cat "${__object}/parameter/editor")
editors=$(update-alternatives --list editor)

if test $(echo "${editors}" | wc -l) -lt 1
then
	echo 'No editors have been found on this system.' >&2
	exit 1
fi

case $editor
in
	/*)
		is_path=true
		;;
	*/*)
		echo 'Relative editor paths are not supported' >&2
		exit 1
		;;
	*)
		is_path=false
		;;
esac


IFS='
'
if $is_path
then
	if ! test -f "${editor}"
	then
		echo "Editor ${editor} is missing on the target system." >&2
		exit 1
	fi

	for e in $editors
	do
		if test "${editor}" = "${e}"
		then
			# Editor is present and part of the alternatives list -> use it!
			echo "${editor}"
			exit 0
		fi
	done

	echo "Editor ${editor} is not in the alternatives list of the target system." >&2
	exit 1
else
	for e in $editors
	do
		if test "$(basename "${e}")" = "${editor}"
		then
			# Editor could be found by basename in the alternatives list -> use it!
			echo "${e}"
			exit 0
		fi
	done

	echo "Editor ${editor} is missing on the target system." >&2
	exit 1
fi

exit 1