Add Plugin.uninstall callback support (SteamDeckHomebrew#555)

* Add Plugin.uninstall callback support

SteamDeckHomebrew#536

* Remove empty deck.sh

backend/src/plugin.py

@@ -78,7 +78,7 @@ def _init(self):
 
             # append the plugin's `py_modules` to the recognized python paths
             syspath.append(path.join(environ["DECKY_PLUGIN_DIR"], "py_modules"))
-            
+
             #TODO: FIX IN A LESS CURSED WAY
             keys = [key.replace("src.", "") for key in sysmodules if key.startswith("src.")]
             for key in keys:
@@ -113,12 +113,29 @@ async def _unload(self):
             self.log.error("Failed to unload " + self.name + "!\n" + format_exc())
             exit(0)
 
+    async def _uninstall(self):
+        try:
+            self.log.info("Attempting to uninstall with plugin " + self.name + "'s \"_uninstall\" function.\n")
+            if hasattr(self.Plugin, "_uninstall"):
+                await self.Plugin._uninstall(self.Plugin)
+                self.log.info("Uninstalled " + self.name + "\n")
+            else:
+                self.log.info("Could not find \"_uninstall\" in " + self.name + "'s main.py" + "\n")
+        except:
+            self.log.error("Failed to uninstall " + self.name + "!\n" + format_exc())
+            exit(0)
+
     async def _on_new_message(self, message : str) -> str|None:
         data = loads(message)
 
         if "stop" in data:
             self.log.info("Calling Loader unload function.")
             await self._unload()
+
+            if data.get('uninstall'):
+                self.log.info("Calling Loader uninstall function.")
+                await self._uninstall()
+
             get_event_loop().stop()
             while get_event_loop().is_running():
                 await sleep(0)
@@ -141,12 +158,12 @@ def start(self):
         multiprocessing.Process(target=self._init).start()
         return self
 
-    def stop(self):
+    def stop(self, uninstall: bool = False):
         if self.passive:
             return
 
         async def _(self: PluginWrapper):
-            await self.socket.write_single_line(dumps({ "stop": True }, ensure_ascii=False))
+            await self.socket.write_single_line(dumps({ "stop": True, "uninstall": uninstall }, ensure_ascii=False))
             await self.socket.close_socket_connection()
 
         get_event_loop().create_task(_(self))
@@ -155,7 +172,7 @@ async def execute_method(self, method_name: str, kwargs: Dict[Any, Any]):
         if self.passive:
             raise RuntimeError("This plugin is passive (aka does not implement main.py)")
         async with self.method_call_lock:
-            # reader, writer = 
+            # reader, writer =
             await self.socket.get_socket_connection()
 
             await self.socket.write_single_line(dumps({ "method": method_name, "args": kwargs }, ensure_ascii=False))