fix: non-GNOME systemd fallbacks for session scripts (#147)

scripts/session/session-logout.sh

@@ -1,8 +1,20 @@
-#!/bin/sh
+#!/usr/bin/sh
 #
 # name: Log Out
 # icon: system-log-out
 # description: Log out to the login screen
 # keywords: log out logout
 
-gnome-session-quit --logout
+set -eu
+
+is_gnome() {
+  command -v dbus-send >/dev/null && \
+    command -v gnome-session-quit >/dev/null && \
+    dbus-send --print-reply --dest=org.gnome.Shell /org/gnome/Shell org.freedesktop.DBus.Properties.Get string:org.gnome.Shell string:ShellVersion >/dev/null 2>&1
+}
+
+if is_gnome; then
+  gnome-session-quit --logout
+elif command -v loginctl >/dev/null; then
+  loginctl terminate-user "${USER}"
+fi

scripts/session/session-reboot.sh

@@ -1,8 +1,20 @@
-#!/bin/sh
+#!/usr/bin/sh
 #
 # name: Restart
 # icon: system-restart
 # description: Reboot the system
 # keywords: power reboot restart
 
-gnome-session-quit --reboot
+set -eu
+
+is_gnome() {
+  command -v dbus-send >/dev/null && \
+    command -v gnome-session-quit >/dev/null && \
+    dbus-send --print-reply --dest=org.gnome.Shell /org/gnome/Shell org.freedesktop.DBus.Properties.Get string:org.gnome.Shell string:ShellVersion >/dev/null 2>&1
+}
+
+if is_gnome; then
+  gnome-session-quit --reboot
+elif command -v systemctl >/dev/null; then
+  systemctl reboot
+fi

scripts/session/session-shutdown.sh

@@ -1,8 +1,20 @@
-#!/bin/sh
+#!/usr/bin/sh
 #
 # name: Power off
 # icon: system-shutdown
 # description: Shut down the system
 # keywords: power off shutdown poweroff
 
-gnome-session-quit --power-off
+set -eu
+
+is_gnome() {
+  command -v dbus-send >/dev/null && \
+    command -v gnome-session-quit >/dev/null && \
+    dbus-send --print-reply --dest=org.gnome.Shell /org/gnome/Shell org.freedesktop.DBus.Properties.Get string:org.gnome.Shell string:ShellVersion >/dev/null 2>&1
+}
+
+if is_gnome; then
+  gnome-session-quit --power-off
+elif command -v systemctl >/dev/null; then
+  systemctl poweroff
+fi

scripts/session/session-suspend.sh

@@ -1,8 +1,10 @@
-#!/bin/sh
+#!/usr/bin/sh
 #
 # name: Suspend
 # icon: system-suspend
 # description: Suspend the system
 # keywords: suspend sleep
 
+set -eu
+
 systemctl suspend