#!/bin/sh
# This script sets the X session started with the startx command or
# with a display manager, unless the session be set from the display
# manager's greeter.
# the accountsservice package in Slint.
# Written from scratch and dedicates to the public domain as stated in
# https://unlicense.org/
# Didier Spaier didieratslintdotfr  25 November 2017

# Currently usable with lightdm or using startx but not using sddm.
# 21 April 2022
export TEXTDOMAIN=slint-scripts
if [ "$(id -u)" -eq 0 ]; then
	gettext "Running a graphical session as root is not allowed."; echo
	exit
fi

listesessions() {
	cd /usr/share/xsessions || exit 1
	for filename in *; do
		name=$(printf '%s' "${filename%.*}")
		[ "$name" = "gnome-xorg" ] && continue
		[ "$name" = "z_plasma-safe" ] && name="plasma-safe"
		echo $name
	done|sort
}

currentsession() {
	if [ ! -f "$HOME/.dmrc" ]; then
		gettext "Your default session is not set."; echo
	else
		gettext "Your session is currently set to"
		name=$(sed -n "s@.*=@@;2p" "$HOME/.dmrc")
		[ "$name" = "z_plasma-safe" ] && name="plasma-safe"
		echo " ${name}."
	fi
}

usage() {
	gettext "Usage: session-chooser <desktop session>"; echo
	gettext "Available desktop sessions:"; echo
	listesessions
	currentsession
}
 
[ $# -ne 1 ] && usage && exit

session=$(echo "$1"|tr '[:upper:]' '[:lower:]')

[ "$session" = "plasma-safe" ] && session="z_plasma-safe"

# This is for lightdm, kept to store then display the chosen session. 
echo '[Desktop]' > "$HOME/.dmrc"
echo "Session=$session" >> "$HOME/.dmrc"

# This is for startx
cp /etc/X11/xinit/xinitrc.${session%-classic} "$HOME/.xinitrc"
[ "$session" = "z_plasma-safe" ]  \
&& \
sed "s@startplasma-x11@startplasma-x11 --failsafe@" "$HOME/.xinitrc" > /tmp/.xinitrc \
&& mv /tmp/.xinitrc "$HOME/.xinitrc"
# We need to run setxkbmap just after having started X, so that $DISPLAY
# be set. But in some cases that is easier to do live than when building
# the window manager or desktop. 
case $session in
	lxqt|mate|ratpoison|xfce|gnome) (cd "$HOME" || exit 1
		sed "/exec/i\
/usr/bin/setxkbmap" .xinitrc > bof
		mv bof .xinitrc);;
	gnome-classic) (cd "$HOME" || exit 1
		sed '/exec/i\
/usr/bin/setxkbmap' .xinitrc > bof
		sed '/exec/i\
export GNOME_SHELL_SESSION_MODE=classic' bof > .xinitrc
		rm -f bof);;
  	*) (cd "$HOME" || exit 1
	sed "/DESKTOP_SESSION/i \
/usr/bin/setxkbmap" .xinitrc > bof
		mv bof .xinitrc)
esac
case $session in
	z_plasma-safe) displayedsession=plasma-safe;;
	*) displayedsession=$session
esac
gettext  "Your default session has been set to"
echo " ${displayedsession}."