# Copyright 1999-2022 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id: $

DESCRIPTION="Manage the LightDM greeters"
MAINTAINER="renegart@gmx.de"
EBUILD_VERSION="0.0.1"

# read lightdm config
if [ -f "${EROOT}"/etc/lightdm/lightdm.conf ]; then
	current=$(grep -v '^#' "${EROOT}"/etc/lightdm/lightdm.conf | grep "greeter-session" )
	current=${current##*=}
fi

# set the greeter
set_greeter() {
        local greeter=$1

        if is_number "${greeter}"; then
                local greeters=( $(find_greeters) )
                greeter=${greeters[greeter-1]}
        fi

        if [[ -z ${greeter} ]]; then
                die -q "Greeter \"$1\" doesn't appear to be valid!"
	fi

	if [[ ! -e "${EROOT}"/usr/share/xgreeters/${greeter}.desktop ]]; then
		die -q "Greeter \"$1\" doesn't appear to be valid!"
	fi

	exec_=$(grep -v '^#' "${EROOT}"/usr/share/xgreeters/${greeter}.desktop | grep "Exec" )
	exec_=${exec_##*=}

	if [[ -z ${exec_} ]]; then
		die -q "Could not evaluate executable for greeter \"$1\"!"
        fi

	if [[ -e "${EROOT}"/usr/libexec/lightdm/lightdm-set-defaults ]]; then
		"${EROOT}"/usr/libexec/lightdm/lightdm-set-defaults --greeter=${exec_}
        else
		if line=$(grep -s -m 1 -e "greeter-session" "${EROOT}/etc/lightdm/lightdm.conf"); then
			sed -i -e "s/greeter-session=.*/greeter-session=${exec_}/" "${EROOT}/etc/lightdm/lightdm.conf"
		else
			echo "greeter-session=${exec_}" >> "${EROOT}/etc/lightdm/lightdm.conf"
		fi
        fi
}

# find a list of greeters
find_greeters() {
	local f
	for f in "${EROOT}"/usr/share/xgreeters/*; do
		[[ -f ${f} ]] && basename "${f}" .desktop
	done
}

### show action ###

describe_show() {
	echo "Show the current set greeter"
}

do_show() {
	write_list_start "Current greeter:"
	
	if [ "${current}" ]; then
		write_kv_list_entry "${current}" ""
	else
		write_kv_list_entry "(unset)" ""
	fi
}

## list action ###

describe_list() {
	echo "List available greeters"
}

do_list() {
	local i greeters=( $(find_greeters) )
	write_list_start "Available greeters:"

	if [ "${current}" ]; then
		for (( i = 0; i < ${#greeters[@]}; i++ )); do
			# highlight the current set greeter
			[[ ${greeters[i]} = ${current} ]] && greeters[i]=$(highlight_marker "${greeters[i]}")
		done
	fi
	write_numbered_list -m "(none found)" "${greeters[@]}"
}


### set action ###

describe_set() {
    echo "Set a new LightDM greeter"
}

describe_set_parameters() {
    echo "<greeter>"
}

describe_set_options() {
    echo "greeter : Greeter name or number (from 'list' action)"
}

do_set() {
	[[ -z $1 ]] && die -q "You didn't tell me what greeter to set"
	[[ $# -gt 1 ]] && die -q "Too many parameters"

	set_greeter "$1" || die -q "Couldn't set a new greeter"
}