Add editor_did_init_left_buttons gui_hook

qt/aqt/editor.py

@@ -137,6 +137,8 @@ class Editor:
             ),
         ]
 
+        gui_hooks.editor_did_init_left_buttons(lefttopbtns, self)
+
         righttopbtns: List[str] = [
             self._addButton("text_bold", "bold", _("Bold text (Ctrl+B)"), id="bold"),
             self._addButton(

qt/aqt/gui_hooks.py

@@ -1401,6 +1401,33 @@ class _EditorDidInitButtonsHook:
 editor_did_init_buttons = _EditorDidInitButtonsHook()
 
 
+class _EditorDidInitLeftButtonsHook:
+    _hooks: List[Callable[[List[str], "aqt.editor.Editor"], None]] = []
+
+    def append(self, cb: Callable[[List[str], "aqt.editor.Editor"], None]) -> None:
+        """(buttons: List[str], editor: aqt.editor.Editor)"""
+        self._hooks.append(cb)
+
+    def remove(self, cb: Callable[[List[str], "aqt.editor.Editor"], None]) -> None:
+        if cb in self._hooks:
+            self._hooks.remove(cb)
+
+    def count(self) -> int:
+        return len(self._hooks)
+
+    def __call__(self, buttons: List[str], editor: aqt.editor.Editor) -> None:
+        for hook in self._hooks:
+            try:
+                hook(buttons, editor)
+            except:
+                # if the hook fails, remove it
+                self._hooks.remove(hook)
+                raise
+
+
+editor_did_init_left_buttons = _EditorDidInitLeftButtonsHook()
+
+
 class _EditorDidInitShortcutsHook:
     _hooks: List[Callable[[List[Tuple], "aqt.editor.Editor"], None]] = []
 

qt/tools/genhooks_gui.py

@@ -606,6 +606,10 @@ gui_hooks.webview_did_inject_style_into_page.append(mytest)
     ),
     # Editing
     ###################
+    Hook(
+        name="editor_did_init_left_buttons",
+        args=["buttons: List[str]", "editor: aqt.editor.Editor"],
+    ),
     Hook(
         name="editor_did_init_buttons",
         args=["buttons: List[str]", "editor: aqt.editor.Editor"],