add signal handler

nwg_panel/config.py

@@ -4,6 +4,7 @@ import os
 import sys
 import subprocess
 import gi
+import signal
 
 gi.require_version('Gtk', '3.0')
 from gi.repository import Gtk, Gdk, GLib
@@ -125,6 +126,15 @@ SKELETON_PANEL: dict = {
 }
 
 
+def signal_handler(sig, frame):
+    desc = {2: "SIGINT", 15: "SIGTERM", 10: "SIGUSR1"}
+    if sig == 2 or sig == 15:
+        print("Terminated with {}".format(desc[sig]))
+        Gtk.main_quit()
+    else:
+        print("{} signal received".format(sig))
+
+
 def handle_keyboard(window, event):
     if event.type == Gdk.EventType.KEY_RELEASE and event.keyval == Gdk.KEY_Escape:
         window.close()
@@ -2331,6 +2341,10 @@ def main():
     global selector_window
     selector_window = PanelSelector()
 
+    signal.signal(signal.SIGINT, signal_handler)
+    signal.signal(signal.SIGTERM, signal_handler)
+    signal.signal(signal.SIGUSR1, signal_handler)
+
     Gtk.main()