Add some last-resort exception handling

main.py

@@ -72,31 +72,34 @@ def write_line(line: int, text: str, text_color: Color = COLOR_LCD_AMBER):
 
 def update_screen(config: Config, updates: list[ArrivalTime]) -> None:
     """ Repaint the screen with the new arrival times """
-    updates = updates[0:LINE_COUNT] # take the first X lines
-    for line_num, update in enumerate(updates):
-        # Find what color we need to use for the ETA
-        time_to_walk = update.due_in_minutes - (config.minutes_to_stop(update.stop_id) or 0)
-        lcd_color = None
-        if time_to_walk > 5:
-            lcd_color = COLOR_LCD_GREEN
-        elif time_to_walk > 1:
-            lcd_color = COLOR_LCD_AMBER
-        else:
-            lcd_color = COLOR_LCD_RED
+    try: 
+        updates = updates[0:LINE_COUNT] # take the first X lines
+        for line_num, update in enumerate(updates):
+            # Find what color we need to use for the ETA
+            time_to_walk = update.due_in_minutes - (config.minutes_to_stop(update.stop_id) or 0)
+            lcd_color = None
+            if time_to_walk > 5:
+                lcd_color = COLOR_LCD_GREEN
+            elif time_to_walk > 1:
+                lcd_color = COLOR_LCD_AMBER
+            else:
+                lcd_color = COLOR_LCD_RED
 
-        # Draw the line
-        write_entry(
-            line = line_num,
-            route = update.route_id,
-            destination = update.destination,
-            time_left = 'Due' if update.isDue() else  update.due_in_str(),
-            time_color = lcd_color,
-            text_color = COLOR_LCD_GREEN if update.is_added else COLOR_LCD_AMBER
-        )
+            # Draw the line
+            write_entry(
+                line = line_num,
+                route = update.route_id,
+                destination = update.destination,
+                time_left = 'Due' if update.isDue() else  update.due_in_str(),
+                time_color = lcd_color,
+                text_color = COLOR_LCD_GREEN if update.is_added else COLOR_LCD_AMBER
+            )
 
-    # Add the current time to the bottom line
-    datetime_text = "Current time: " + datetime.today().strftime("%d/%m/%Y %H:%M")
-    write_line(5, datetime_text)
+        # Add the current time to the bottom line
+        datetime_text = "Current time: " + datetime.today().strftime("%d/%m/%Y %H:%M")
+        write_line(5, datetime_text)
+    except Exception as e:
+        print("Error updating screen: ", str(e))
 
 def clear_screen() -> None:
     """ Clear screen """
@@ -148,29 +151,32 @@ def main():
     # Main event loop
     running = True
     while running:
-        # Pygame event handling begins
-        if pygame.event.peek():
-            for e in pygame.event.get():
-                if e.type == pygame.QUIT:
-                    running = False
-                elif e.type == pygame.KEYDOWN:
-                    if e.key == pygame.K_ESCAPE:
+        try: 
+            # Pygame event handling begins
+            if pygame.event.peek():
+                for e in pygame.event.get():
+                    if e.type == pygame.QUIT:
                         running = False
-            pygame.display.flip()
-        # Pygame event handling ends
+                    elif e.type == pygame.KEYDOWN:
+                        if e.key == pygame.K_ESCAPE:
+                            running = False
+                pygame.display.flip()
+            # Pygame event handling ends
 
-        # Display update begins
-        schedule.run_pending()
-        if update_queue.qsize() > 0:
-            clear_screen()
-            updates = update_queue.get()
-            update_screen(config, updates)
+            # Display update begins
+            schedule.run_pending()
+            if update_queue.qsize() > 0:
+                clear_screen()
+                updates = update_queue.get()
+                update_screen(config, updates)
 
-            pygame.display.flip()
-            gc.collect()
-        # Display update ends
+                pygame.display.flip()
+                gc.collect()
+            # Display update ends
 
-        sleep(0.2) 
+            sleep(0.2)
+        except Exception as e:
+            print("Exception in main loop: ", str(e))
     pygame.quit()
     exit(0)