add a UI class

main.py

@@ -7,6 +7,7 @@ import os
 from datetime import timezone
 import sqlite3
 import sys
+import threading
 from time import sleep
 from typing import Optional, Tuple, TypeVar
 
@@ -86,16 +87,11 @@ def setup() -> Optional[Exception]:
     
     return None
 
-def main() -> Optional[Exception]:
-    username = getuser()
-
-    e = setup()
-    if e is not None:
-        return e
-
-    # TODO rug sweep curses stuff
-    parentwin = curses.initscr()
-    parentwin.keypad(True)
+class UI:
+    def __init__(self) -> None:
+        self.quitting = False
+        self.pwin = curses.initscr()
+        self.pwin.keypad(True)
         curses.noecho()
         curses.raw()
         if curses.has_colors():
@@ -108,19 +104,49 @@ def main() -> Optional[Exception]:
             # so we ignore this error for terminal compatibility.
             pass
         if curses.COLS < MIN_SCREEN_WIDTH:
-        return Exception("the terminal window is too narrow")
+            raise Exception("the terminal window is too narrow")
         if curses.LINES < MIN_SCREEN_HEIGHT:
-        return Exception("the terminal window is too short")
-
-    menuwin = curses.newwin(10, 30, 4, 2)
-    plantwin = curses.newwin(30, 40, 4, 31)
-    scorewin = curses.newwin(2, 30, 15, 2)
+            raise Exception("the terminal window is too short")
+        self.menuwin = curses.newwin(10, 30, 4, 2)
+        self.plantwin = curses.newwin(30, 40, 4, 31)
+        self.scorewin = curses.newwin(2, 30, 15, 2)
         # TODO info area (is this where prompt is rendered?)
 
+    def quit(self) -> None:
+        self.quitting = True
+
+    def handle_input(self) -> None:
         while True:
-        c = parentwin.getch()
+            c = self.pwin.getch()
             if c == -1 or c == ord("q") or c == ord("x") or c == 27:
+                self.quit()
                 break
+
+# TODO Plant
+
+def main() -> Optional[Exception]:
+    username = getuser()
+
+    e = setup()
+    if e is not None:
+        return e
+
+    try:
+        ui = UI()
+    except Exception as e:
+        return Exception(f"could not initialize UI: {e}")
+
+    ithread = threading.Thread(target=ui.handle_input, args=())
+    ithread.start()
+
+    while True:
+        if ui.quitting:
+            break
+
+        # TODO get plant info from db
+        # TODO update in-memory representation of derived characteristics / plant info
+        # TODO redraw plant (if changed)
+        # TODO redraw water gauge
         sleep(INTERVAL)
     
     try: