Hook editor_note_will_load

A current problem I have is that there is nothing similar to hook
inside of javascript. It seems that it would be easier to be able to
add other methods in javascript and call them in loadNote. Currently I
simply redefined loadNote, which is far from perfect

qt/aqt/editor.py

@@ -456,6 +456,7 @@ class Editor:
             json.dumps(focusTo),
             json.dumps(self.note.id),
         )
+        js = gui_hooks.editor_will_load_note(js, self.note, self)
         self.web.evalWithCallback(js, oncallback)
 
     def fonts(self) -> List[Tuple[str, int, bool]]:

qt/aqt/gui_hooks.py

@@ -1207,6 +1207,40 @@ class _EditorWebViewDidInitHook:
 editor_web_view_did_init = _EditorWebViewDidInitHook()
 
 
+class _EditorWillLoadNoteFilter:
+    """Allows changing the javascript commands to load note before
+        executing it and do change in the QT editor."""
+
+    _hooks: List[Callable[[str, "anki.notes.Note", "aqt.editor.Editor"], str]] = []
+
+    def append(
+        self, cb: Callable[[str, "anki.notes.Note", "aqt.editor.Editor"], str]
+    ) -> None:
+        """(js: str, note: anki.notes.Note, editor: aqt.editor.Editor)"""
+        self._hooks.append(cb)
+
+    def remove(
+        self, cb: Callable[[str, "anki.notes.Note", "aqt.editor.Editor"], str]
+    ) -> None:
+        if cb in self._hooks:
+            self._hooks.remove(cb)
+
+    def __call__(
+        self, js: str, note: anki.notes.Note, editor: aqt.editor.Editor
+    ) -> str:
+        for filter in self._hooks:
+            try:
+                js = filter(js, note, editor)
+            except:
+                # if the hook fails, remove it
+                self._hooks.remove(filter)
+                raise
+        return js
+
+
+editor_will_load_note = _EditorWillLoadNoteFilter()
+
+
 class _EditorWillShowContextMenuHook:
     _hooks: List[Callable[["aqt.editor.EditorWebView", QMenu], None]] = []
 

qt/tools/genhooks_gui.py

@@ -498,6 +498,13 @@ def emptyNewCard():
         args=["editor_web_view: aqt.editor.EditorWebView"],
     ),
     Hook(name="editor_did_init", args=["editor: aqt.editor.Editor"],),
+    Hook(
+        name="editor_will_load_note",
+        args=["js: str", "note: anki.notes.Note", "editor: aqt.editor.Editor"],
+        return_type="str",
+        doc="""Allows changing the javascript commands to load note before
+        executing it and do change in the QT editor.""",
+    ),
     # Sound/video
     ###################
     Hook(name="av_player_will_play", args=["tag: anki.sound.AVTag"]),