Update README, fix some per-game profile functionality

README.md

@@ -14,7 +14,7 @@ You will need that installed for this plugin to work.
 - Set some GPU power parameters (fastPPT & slowPPT)
 - Set the fan RPM (unsupported on SteamOS beta)
 - Display supplementary battery info
-- Keep settings between restarts (stored in `~/.config/powertools.json`)
+- Keep settings between restarts (stored in `~/.config/powertools/<appid>.json`)
 
 ## Cool, but that's too much work
 
@@ -79,6 +79,24 @@ This is how I figured out how the fan stuff works.
 I've only scratched the surface of what this code allows, I'm sure it has more useful information.
 https://lkml.org/lkml/2022/2/5/391
 
+### Game launch detection
+
+The biggest limitation right now is it can't detect a game closing -- only opening -- and only after PowerTools is looked at at least once (per SteamOS restart).
+
+From a plugin, this can be accomplished by running some front-end Javascript.
+
+```javascript
+await execute_in_tab("SP", false,
+    `SteamClient.Apps.RegisterForGameActionStart((actionType, data) => {
+        console.log("start game", appStore.GetAppOverviewByGameID(data));
+    });`
+);
+```
+
+In PowerTools, the callback (the part surrounded by `{` and `}`, containing `console.log(...)`) sends a message to a local HTTP server to notify the PowerTools back-end that a game has been launched.
+
+If you go to `http://127.0.0.1:5030` on your Steam Deck with PowerTools >=0.6.0, you can see some info about the last game you launched.
+
 ## License
 
 This is licensed under GNU GPLv3.

main.py

@@ -406,6 +406,9 @@ class Plugin:
             self.current_gameid = current_game.gameid
             self.modified_settings = True
         else:
+            if not enabled and current_game is not None and current_game.has_settings():
+                # delete settings; disable settings loading
+                os.remove(current_game.settings_path())
             self.current_gameid = None
 
     async def get_per_game_profile(self) -> bool:

server.py

@@ -64,11 +64,13 @@ class Server(web.Application):
         logging.debug("Debug index page accessed")
         current_game = None if self.current_game is None else self.current_game.gameid
         game_info = None if self.current_game is None else self.current_game.game_info
+        settings_info = None if self.current_game is None else self.current_game.load_settings()
         return web.json_response({
             "name": "PowerTools",
             "version": self.version,
             "latest_game_id": current_game,
-            "game_info": game_info
+            "game_info": game_info,
+            "settings": settings_info
         }, headers={"Access-Control-Allow-Origin": "*"})
 
     async def on_game_start(self, request):
@@ -125,7 +127,7 @@ async def start(version):
     http_server = Server(version)
     http_runner = web.AppRunner(http_server)
     await http_runner.setup()
-    site = web.TCPSite(http_runner, '0.0.0.0', 5030)
+    site = web.TCPSite(http_runner, '127.0.0.1', 5030)
     await site.start()
 
 async def shutdown(): # never really called