Show a python GTK3 dialog if zenity is missing.

packaging/linux/gtk-dialog.py

@@ -0,0 +1,48 @@
+#!/usr/bin/python
+"""A simple GTK3 graphical dialog helper that can be used as a fallback if zenity is not available
+   Compatible with python 2 or 3 with the gi bindings.
+
+   Three modes are available:
+       test: accepts no arguments, returns 0 if the python dependencies are available, or 1 if not
+       error: show a gtk-3 error dialog
+              accepts arguments --title and --text
+       error: show a gtk-3 question dialog
+              accepts arguments --title and --text
+              returns 0 on Yes, or 1 on No
+"""
+
+import sys
+
+try:
+    import argparse
+    import gi
+    gi.require_version('Gtk', '3.0')
+    from gi.repository import Gtk
+except ImportError:
+    sys.exit(1)
+
+class Error():
+    def __init__(self, title, text):
+        dialog = Gtk.MessageDialog(None, 0, Gtk.MessageType.ERROR, Gtk.ButtonsType.OK, title)
+        dialog.format_secondary_text(text)
+        dialog.run()
+        dialog.destroy()
+
+class Question():
+    def __init__(self, title, text):
+        dialog = Gtk.MessageDialog(None, 0, Gtk.MessageType.QUESTION, Gtk.ButtonsType.YES_NO, title)
+        dialog.format_secondary_text(text)
+        response = dialog.run()
+        dialog.destroy()
+        sys.exit(0 if response == Gtk.ResponseType.YES else 1)
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+    parser.add_argument('type', choices=['error', 'question', 'test'])
+    parser.add_argument('--title', type=str, required=False, default='')
+    parser.add_argument('--text', type=str, required=False, default='')
+    args = parser.parse_args()
+    if args.type == 'question':
+        Question(args.title, args.text.replace('\\n', '\n'))
+    elif args.type == 'error':
+        Error(args.title, args.text.replace('\\n', '\n'))