misc: fix all ty diagnostics

ty reported 20 diagnostics, and 0.0.89 adds a few more; this clears
them all without suppressions.

- The quest monster is held in a local before being stored on the
  quest book, so its name no longer reads from an Optional.
- PgUp/PgDn narrow the focused window with isinstance against a
  runtime-checkable PageScrollable protocol instead of hasattr.
- The ^t cheat used to monkeypatch SignalMixin.emit. SignalMixin now
  has a muted() context manager that emit() checks, and it restores
  emission even if a tick raises.
- GameView keeps its children as GameWindow, a protocol declaring
  stop() and sync(), so the cheat's resync type-checks.
- curses.ascii is imported explicitly where it is used.
- ProgressBarWindow is now Focusable itself, instead of calling
  Focusable.focus_standout() on a class that is not Focusable. Its
  four subclasses drop the duplicate Focusable base; the MRO and
  initialisation order are unchanged.
- MainMenu narrows the Optional pad before colouring the logo.
- The tests that record tasks assert player.task is set.
- Context managers are annotated as Generator rather than Iterator,
  which ty flags as deprecated for @contextmanager.
- The redundant cast() around getch() is gone.
- The frozen GameData test assigns through setattr(), since the
  direct assignment is an error by design.

Bug fixes:

- ListBox.select(None) crashed on `None < 0`; it now clears the
  selection, as DataTable.select(None) already does.
- ListBox.get() caught ValueError, which indexing never raises; it
  now catches IndexError, so an out-of-range index returns None as
  intended.

pqcli/mechanic.py

@@ -1,10 +1,11 @@
+import contextlib
 import datetime
 import functools
 import itertools
 import logging
 import math
 from collections import defaultdict
-from collections.abc import Callable, Iterator, Sequence
+from collections.abc import Callable, Generator, Iterator, Sequence
 from dataclasses import dataclass
 from typing import Any, cast
 
@@ -42,7 +43,21 @@ _SIGNALS: dict[tuple["SignalMixin", str], list[Callable[..., Any]]] = (
 
 
 class SignalMixin:
+    _muted = 0
+
+    @staticmethod
+    @contextlib.contextmanager
+    def muted() -> Generator[None, None, None]:
+        """Suppress all signal emission for the duration of the block."""
+        SignalMixin._muted += 1
+        try:
+            yield
+        finally:
+            SignalMixin._muted -= 1
+
     def emit(self, signal_name: str, *user_data: Any) -> None:
+        if SignalMixin._muted:
+            return
         for callback in _SIGNALS[self, signal_name]:
             callback(*user_data)
 
@@ -683,12 +698,11 @@ class Simulation:
         caption = ""
         choice = random.below(5)
         if choice == 0:
-            self.player.quest_book.monster = unnamed_monster(
+            monster = unnamed_monster(
                 self.data, self.player.level, iterations=3
             )
-            caption = "Exterminate " + definite(
-                self.player.quest_book.monster.name, 2
-            )
+            self.player.quest_book.monster = monster
+            caption = "Exterminate " + definite(monster.name, 2)
         elif choice == 1:
             caption = "Seek " + definite(interesting_item(self.data), 1)
         elif choice == 2:

pqcli/random.py

@@ -1,6 +1,6 @@
 import contextlib
 import time
-from collections.abc import Callable, Iterator, Sequence
+from collections.abc import Callable, Generator, Sequence
 from typing import Any
 
 RngState = tuple[float, float, float, int]
@@ -91,7 +91,7 @@ def seed(source: str) -> None:
 
 
 @contextlib.contextmanager
-def using(rng: Alea) -> Iterator[None]:
+def using(rng: Alea) -> Generator[None, None, None]:
     """Draw from rng instead of the shared generator inside the block."""
     global _current
     previous = _current

pqcli/ui/curses/__init__.py

@@ -3,7 +3,7 @@ import curses
 import os
 import signal
 import time
-from typing import Any, cast
+from typing import Any
 
 from pqcli import lingo
 from pqcli.config import Class, Race
@@ -91,7 +91,7 @@ class CursesUserInterface(BaseUserInterface):
                 self._switch_to_roster_view()
 
             while True:
-                key = cast(int, self._screen.getch())
+                key = self._screen.getch()
 
                 if key == curses.ERR:
                     time.sleep(0.1)

pqcli/ui/curses/views/game_view/__init__.py

@@ -1,7 +1,8 @@
 import argparse
 import curses
+import curses.ascii
 import datetime
-from typing import Any
+from typing import Any, Protocol, runtime_checkable
 
 from pqcli.game_data import GameData
 from pqcli.mechanic import Player, SignalMixin, Simulation
@@ -16,7 +17,7 @@ from pqcli.ui.curses.util import (
     KEYS_UP,
 )
 from pqcli.ui.curses.views.base_view import BaseView
-from pqcli.ui.curses.widgets import Focusable, Widget
+from pqcli.ui.curses.widgets import Focusable
 
 from .character_sheet_window import CharacterSheetWindow
 from .equipment_window import EquipmentWindow
@@ -27,6 +28,19 @@ from .spell_book_window import SpellBookWindow
 from .task_progress_window import TaskProgressWindow
 
 
+class GameWindow(Protocol):
+    def stop(self) -> None: ...
+
+    def sync(self) -> None: ...
+
+
+@runtime_checkable
+class PageScrollable(Protocol):
+    def scroll_page_up(self) -> None: ...
+
+    def scroll_page_down(self) -> None: ...
+
+
 class GameView(BaseView):
     def __init__(
         self,
@@ -53,11 +67,11 @@ class GameView(BaseView):
             self.on_exit()
 
         elif key in {curses.KEY_PPAGE}:
-            if hasattr(focused, "scroll_page_up"):
+            if isinstance(focused, PageScrollable):
                 focused.scroll_page_up()
 
         elif key in {curses.KEY_NPAGE}:
-            if hasattr(focused, "scroll_page_down"):
+            if isinstance(focused, PageScrollable):
                 focused.scroll_page_down()
 
         elif key in KEYS_CYCLE:
@@ -118,11 +132,9 @@ class GameView(BaseView):
                 self._simulation.tick()
 
         elif self._args.cheats and key == curses.ascii.DC4:  # ^t
-            old = SignalMixin.emit
-            SignalMixin.emit = lambda *_: None
-            for _ in range(10000):
-                self._simulation.tick()
-            SignalMixin.emit = old
+            with SignalMixin.muted():
+                for _ in range(10000):
+                    self._simulation.tick()
             for child in self._children:
                 child.sync()
 
@@ -225,16 +237,18 @@ class GameView(BaseView):
             x=0,
         )
 
-        self._focusable_children: list[Focusable] = [
+        focusable_children = (
             self._char_sheet_win,
             self._spell_book_win,
             self._equipment_win,
             self._inventory_win,
             self._plot_win,
             self._quest_book_win,
-        ]
-        self._children: list[Widget] = self._focusable_children + [
-            self._task_win
+        )
+        self._focusable_children: list[Focusable] = list(focusable_children)
+        self._children: list[GameWindow] = [
+            *focusable_children,
+            self._task_win,
         ]
 
     def stop(self) -> None:

pqcli/ui/curses/views/game_view/character_sheet_window.py

@@ -1,12 +1,11 @@
 from typing import Any
 
 from pqcli.mechanic import Player, StatType
-from pqcli.ui.curses.widgets import Focusable
 
 from .progress_bar_window import DataTableProgressBarWindow
 
 
-class CharacterSheetWindow(Focusable, DataTableProgressBarWindow):
+class CharacterSheetWindow(DataTableProgressBarWindow):
     def __init__(
         self, player: Player, parent: Any, h: int, w: int, y: int, x: int
     ) -> None:

pqcli/ui/curses/views/game_view/inventory_window.py

@@ -1,12 +1,11 @@
 from typing import Any
 
 from pqcli.mechanic import InventoryItem, Player
-from pqcli.ui.curses.widgets import Focusable
 
 from .progress_bar_window import DataTableProgressBarWindow
 
 
-class InventoryWindow(Focusable, DataTableProgressBarWindow):
+class InventoryWindow(DataTableProgressBarWindow):
     def __init__(
         self, player: Player, parent: Any, h: int, w: int, y: int, x: int
     ) -> None:

pqcli/ui/curses/views/game_view/plot_window.py

@@ -2,12 +2,11 @@ from typing import Any
 
 from pqcli.lingo import act_name
 from pqcli.mechanic import Player
-from pqcli.ui.curses.widgets import Focusable
 
 from .progress_bar_window import ListBoxProgressBarWindow
 
 
-class PlotWindow(Focusable, ListBoxProgressBarWindow):
+class PlotWindow(ListBoxProgressBarWindow):
     cutoff = 100
 
     def __init__(

pqcli/ui/curses/views/game_view/progress_bar_window.py

@@ -10,7 +10,7 @@ from pqcli.ui.curses.widgets import (
 )
 
 
-class ProgressBarWindow(WindowWrapper):
+class ProgressBarWindow(Focusable, WindowWrapper):
     def __init__(
         self,
         parent: Any,
@@ -51,7 +51,7 @@ class ProgressBarWindow(WindowWrapper):
 
         self._progress_bar_win.erase()
 
-        with Focusable.focus_standout(self, self._progress_bar_win):
+        with self.focus_standout(self._progress_bar_win):
             self._progress_bar_win.border(
                 curses.ACS_VLINE,
                 curses.ACS_VLINE,
@@ -105,7 +105,7 @@ class DataTableProgressBarWindow(ProgressBarWindow):
         if not self._win:
             return
 
-        with Focusable.focus_standout(self, self._win):
+        with self.focus_standout(self._win):
             self._win.box()
             x = max(0, (self.getmaxyx()[1] - len(self._title)) // 2)
             self._win.addnstr(
@@ -143,7 +143,7 @@ class ListBoxProgressBarWindow(ProgressBarWindow):
         if not self._win:
             return
 
-        with Focusable.focus_standout(self, self._win):
+        with self.focus_standout(self._win):
             self._win.box()
             x = max(0, (self.getmaxyx()[1] - len(self._title)) // 2)
             self._win.addnstr(

pqcli/ui/curses/views/game_view/quest_book_window.py

@@ -1,12 +1,11 @@
 from typing import Any
 
 from pqcli.mechanic import Player
-from pqcli.ui.curses.widgets import Focusable
 
 from .progress_bar_window import ListBoxProgressBarWindow
 
 
-class QuestBookWindow(Focusable, ListBoxProgressBarWindow):
+class QuestBookWindow(ListBoxProgressBarWindow):
     cutoff = 100
 
     def __init__(

pqcli/ui/curses/views/roster_view.py

@@ -38,15 +38,17 @@ class MainMenu(Menu):
             scr_height=scr_height,
             scr_width=scr_width,
         )
+        pad = self._pad
+        assert pad is not None
         if has_colors():
             for y in range(len(self._header_lines)):
-                self._pad.chgat(y, 0, curses.color_pair(COLOR_LOGO))
-            self._pad.chgat(3, 29, 5, curses.color_pair(COLOR_LOGO_ALT))
-            self._pad.chgat(4, 29, 5, curses.color_pair(COLOR_LOGO_ALT))
-            self._pad.chgat(5, 32, 4, curses.color_pair(COLOR_LOGO_ALT))
-            self._pad.chgat(5, 27, 4, curses.color_pair(COLOR_LOGO_ALT))
-            self._pad.chgat(6, 34, 2, curses.color_pair(COLOR_LOGO_ALT))
-            self._pad.chgat(6, 27, 2, curses.color_pair(COLOR_LOGO_ALT))
+                pad.chgat(y, 0, curses.color_pair(COLOR_LOGO))
+            pad.chgat(3, 29, 5, curses.color_pair(COLOR_LOGO_ALT))
+            pad.chgat(4, 29, 5, curses.color_pair(COLOR_LOGO_ALT))
+            pad.chgat(5, 32, 4, curses.color_pair(COLOR_LOGO_ALT))
+            pad.chgat(5, 27, 4, curses.color_pair(COLOR_LOGO_ALT))
+            pad.chgat(6, 34, 2, curses.color_pair(COLOR_LOGO_ALT))
+            pad.chgat(6, 27, 2, curses.color_pair(COLOR_LOGO_ALT))
 
 
 class RosterView(BaseView):

pqcli/ui/curses/widgets/list_box.py

@@ -29,14 +29,14 @@ class ListBox(Scrollable):
             idx %= len(self._items)
         try:
             return self._items[idx]
-        except ValueError:
+        except IndexError:
             return None
 
     def delete(self, idx: int, count: int = 1) -> None:
         del self._items[idx : idx + count]
 
     def select(self, idx: int | None) -> None:
-        if idx < 0 and len(self._items):
+        if idx is not None and idx < 0 and self._items:
             idx %= len(self._items)
         self._selected = idx
 

pqcli/ui/curses/widgets/menu.py

@@ -28,11 +28,12 @@ class Menu(Widget):
 
         w = max(map(len, all_lines)) + 1
         h = len(all_lines) + 1
-        self._pad: Any | None = curses.newpad(h, w)
+        pad = curses.newpad(h, w)
+        self._pad: Any | None = pad
 
         for y, line in enumerate(self._header_lines):
-            self._pad.move(y, 0)
-            self._pad.addstr(line)
+            pad.move(y, 0)
+            pad.addstr(line)
 
         self._active_choice = active_choice
 

tests/game_trace.py

@@ -34,10 +34,12 @@ def run_trace(seed: str, ticks: int = 3000) -> list[str]:
     simulation = Simulation(player, data)
 
     lines: list[str] = []
-    player.connect(
-        "new_task",
-        lambda: lines.append(f"task: {player.task.description}"),
-    )
+
+    def record_task() -> None:
+        assert player.task is not None
+        lines.append(f"task: {player.task.description}")
+
+    player.connect("new_task", record_task)
     for _ in range(ticks):
         simulation.tick(100000.0)
 

tests/test_game_data.py

@@ -179,4 +179,4 @@ def test_game_data_is_immutable() -> None:
     data = load_game_data()
     assert isinstance(data, GameData)
     with pytest.raises(AttributeError):
-        data.spells = ()  # type: ignore[misc]
+        setattr(data, "spells", ())