Made time.sleep async friendly

ctabus/__init__.py

@@ -1,6 +1,7 @@
 #!/usr/bin/python3
 from dateutil import tz
 from dateutil.parser import parse as date_parse
+from threading import Event
 
 import argparse
 import datetime
@@ -22,6 +23,7 @@ from ctabus.internal.notification import NotificationManager, HAS_NOTIFICATION
 HAS_TOAST = shutil.which("termux-toast") is not None
 CHICAGO_TZ = tz.gettz("America/Chicago")
 DATETIME_FORMAT = "%A, %B %e, %Y %H:%M:%S"
+EXIT = Event()
 # https://stackoverflow.com/a/5967539
 
 parser = argparse.ArgumentParser(prog="ctabus")
@@ -159,7 +161,8 @@ class Table:
 
 class CTABUSNotifictaionManager(NotificationManager):
     def on_done(self):
-        quit()
+        EXIT.set()
+        quit(0)
 
 
 def gen_list(objs, data, *displays, key=None, sort=0, num_pic=True):
@@ -184,7 +187,7 @@ def gen_list(objs, data, *displays, key=None, sort=0, num_pic=True):
             which = display_table.get_name_interactive(data)
             return which
     except KeyboardInterrupt:
-        quit()
+        quit(0)
 
 
 config = """\
@@ -301,7 +304,7 @@ def _main_periodic(args, stop_id, init_data):
                 e = time.perf_counter() - s
                 print("Error fetching times")
             if e < args.periodic:
-                time.sleep(args.periodic - e)
+                EXIT.wait(args.periodic - e)
         except KeyboardInterrupt:
             _done = True