Add sync_will_start and sync_did_finish hook

qt/aqt/gui_hooks.py

@@ -2721,6 +2721,60 @@ class _StyleDidInitFilter:
 style_did_init = _StyleDidInitFilter()
 
 
+class _SyncDidFinishHook:
+    _hooks: List[Callable[[], None]] = []
+
+    def append(self, cb: Callable[[], None]) -> None:
+        """()"""
+        self._hooks.append(cb)
+
+    def remove(self, cb: Callable[[], None]) -> None:
+        if cb in self._hooks:
+            self._hooks.remove(cb)
+
+    def count(self) -> int:
+        return len(self._hooks)
+
+    def __call__(self) -> None:
+        for hook in self._hooks:
+            try:
+                hook()
+            except:
+                # if the hook fails, remove it
+                self._hooks.remove(hook)
+                raise
+
+
+sync_did_finish = _SyncDidFinishHook()
+
+
+class _SyncWillStartHook:
+    _hooks: List[Callable[[], None]] = []
+
+    def append(self, cb: Callable[[], None]) -> None:
+        """()"""
+        self._hooks.append(cb)
+
+    def remove(self, cb: Callable[[], None]) -> None:
+        if cb in self._hooks:
+            self._hooks.remove(cb)
+
+    def count(self) -> int:
+        return len(self._hooks)
+
+    def __call__(self) -> None:
+        for hook in self._hooks:
+            try:
+                hook()
+            except:
+                # if the hook fails, remove it
+                self._hooks.remove(hook)
+                raise
+
+
+sync_will_start = _SyncWillStartHook()
+
+
 class _TagEditorDidProcessKeyHook:
     _hooks: List[Callable[[TagEdit, QEvent], None]] = []
 

qt/aqt/main.py

@@ -910,7 +910,9 @@ title="%s" %s>%s</button>""" % (
             self.col.models._clear_cache()
             self.reset()
             after_sync()
+            gui_hooks.sync_did_finish()
 
+        gui_hooks.sync_will_start()
         sync_collection(self, on_done=on_collection_sync_finished)
 
     def maybe_auto_sync_on_open_close(self, after_sync: Callable[[], None]) -> None:

qt/tools/genhooks_gui.py

@@ -562,6 +562,8 @@ gui_hooks.webview_did_inject_style_into_page.append(mytest)
         args=["diag: aqt.emptycards.EmptyCardsDialog"],
         doc="""Allows changing the list of cards to delete.""",
     ),
+    Hook(name="sync_will_start", args=[]),
+    Hook(name="sync_did_finish", args=[]),
     # Adding cards
     ###################
     Hook(