Add hooks for extending the deck options dialog

Introduces three new hooks:

* deck_conf_will_show: Allows adding or modifying widgets
* deck_conf_did_load_config: Allows add-on widgets to read from config
* deck_conf_will_save_config: Allows add-on widgets to write to config

qt/aqt/deckconf.py

@@ -6,6 +6,7 @@ from operator import itemgetter
 import aqt
 from anki.consts import NEW_CARDS_RANDOM
 from anki.lang import _, ngettext
+from aqt import gui_hooks
 from aqt.qt import *
 from aqt.utils import (
     askUser,
@@ -40,6 +41,7 @@ class DeckConf(QDialog):
         self.setWindowTitle(_("Options for %s") % self.deck["name"])
         # qt doesn't size properly with altered fonts otherwise
         restoreGeom(self, "deckconf", adjustSize=True)
+        gui_hooks.deck_conf_will_show(self)
         self.show()
         self.exec_()
         saveGeom(self, "deckconf")
@@ -218,6 +220,7 @@ class DeckConf(QDialog):
         f.replayQuestion.setChecked(c.get("replayq", True))
         # description
         f.desc.setPlainText(self.deck["desc"])
+        gui_hooks.deck_conf_did_load_config(self, self.conf)
 
     def onRestore(self):
         self.mw.progress.start()
@@ -301,6 +304,7 @@ class DeckConf(QDialog):
         c["replayq"] = f.replayQuestion.isChecked()
         # description
         self.deck["desc"] = f.desc.toPlainText()
+        gui_hooks.deck_conf_will_save_config(self, self.deck, self.conf)
         self.mw.col.decks.save(self.deck)
         self.mw.col.decks.save(self.conf)
 

qt/aqt/gui_hooks.py

@@ -518,6 +518,86 @@ class _DeckBrowserWillShowOptionsMenuHook:
 deck_browser_will_show_options_menu = _DeckBrowserWillShowOptionsMenuHook()
 
 
+class _DeckConfDidLoadConfigHook:
+    """Called once widget state has been set from deck config"""
+
+    _hooks: List[Callable[["aqt.deckconf.DeckConf", Any], None]] = []
+
+    def append(self, cb: Callable[["aqt.deckconf.DeckConf", Any], None]) -> None:
+        """(deck_conf: aqt.deckconf.DeckConf, config: Any)"""
+        self._hooks.append(cb)
+
+    def remove(self, cb: Callable[["aqt.deckconf.DeckConf", Any], None]) -> None:
+        if cb in self._hooks:
+            self._hooks.remove(cb)
+
+    def __call__(self, deck_conf: aqt.deckconf.DeckConf, config: Any) -> None:
+        for hook in self._hooks:
+            try:
+                hook(deck_conf, config)
+            except:
+                # if the hook fails, remove it
+                self._hooks.remove(hook)
+                raise
+
+
+deck_conf_did_load_config = _DeckConfDidLoadConfigHook()
+
+
+class _DeckConfWillSaveConfigHook:
+    """Called before widget state is saved to config"""
+
+    _hooks: List[Callable[["aqt.deckconf.DeckConf", Any, Any], None]] = []
+
+    def append(self, cb: Callable[["aqt.deckconf.DeckConf", Any, Any], None]) -> None:
+        """(deck_conf: aqt.deckconf.DeckConf, config: Any, deck: Any)"""
+        self._hooks.append(cb)
+
+    def remove(self, cb: Callable[["aqt.deckconf.DeckConf", Any, Any], None]) -> None:
+        if cb in self._hooks:
+            self._hooks.remove(cb)
+
+    def __call__(
+        self, deck_conf: aqt.deckconf.DeckConf, config: Any, deck: Any
+    ) -> None:
+        for hook in self._hooks:
+            try:
+                hook(deck_conf, config, deck)
+            except:
+                # if the hook fails, remove it
+                self._hooks.remove(hook)
+                raise
+
+
+deck_conf_will_save_config = _DeckConfWillSaveConfigHook()
+
+
+class _DeckConfWillShowHook:
+    """Allows modifying the deck options dialog before it is shown"""
+
+    _hooks: List[Callable[["aqt.deckconf.DeckConf"], None]] = []
+
+    def append(self, cb: Callable[["aqt.deckconf.DeckConf"], None]) -> None:
+        """(deck_conf: aqt.deckconf.DeckConf)"""
+        self._hooks.append(cb)
+
+    def remove(self, cb: Callable[["aqt.deckconf.DeckConf"], None]) -> None:
+        if cb in self._hooks:
+            self._hooks.remove(cb)
+
+    def __call__(self, deck_conf: aqt.deckconf.DeckConf) -> None:
+        for hook in self._hooks:
+            try:
+                hook(deck_conf)
+            except:
+                # if the hook fails, remove it
+                self._hooks.remove(hook)
+                raise
+
+
+deck_conf_will_show = _DeckConfWillShowHook()
+
+
 class _EditorDidFireTypingTimerHook:
     _hooks: List[Callable[["anki.notes.Note"], None]] = []
 

qt/tools/genhooks_gui.py

@@ -121,6 +121,23 @@ hooks = [
         legacy_hook="prepareQA",
         doc="Can modify card text before review/preview.",
     ),
+    # Deck options
+    ###################
+    Hook(
+        name="deck_conf_will_show",
+        args=["deck_conf: aqt.deckconf.DeckConf"],
+        doc="Allows modifying the deck options dialog before it is shown",
+    ),
+    Hook(
+        name="deck_conf_did_load_config",
+        args=["deck_conf: aqt.deckconf.DeckConf", "config: Any"],
+        doc="Called once widget state has been set from deck config",
+    ),
+    Hook(
+        name="deck_conf_will_save_config",
+        args=["deck_conf: aqt.deckconf.DeckConf", "config: Any", "deck: Any"],
+        doc="Called before widget state is saved to config",
+    ),
     # Browser
     ###################
     Hook(