From 693e61073a283c6136461697c943f640cc24f43b Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Wed, 16 Oct 2024 20:51:10 +0530
Subject: [PATCH] Fix reloading of tts config not working till viewer restarted

---
 src/calibre/gui2/tts/types.py | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/src/calibre/gui2/tts/types.py b/src/calibre/gui2/tts/types.py
index ca5c7d0ec2..547d4fef67 100644
--- a/src/calibre/gui2/tts/types.py
+++ b/src/calibre/gui2/tts/types.py
@@ -16,11 +16,13 @@ from calibre.utils.localization import canonicalize_lang
 
 CONFIG_NAME = 'tts'
 TTS_EMBEDED_CONFIG = 'tts-embedded'
+conf_cache = {}  # for some reason LRU cache doesn't work for this
 
 
-@lru_cache(2)
 def load_config(config_name=CONFIG_NAME) -> JSONConfig:
-    return JSONConfig(config_name)
+    if (ans := conf_cache.get(config_name)) is None:
+        ans = conf_cache[config_name] = JSONConfig(config_name)
+    return ans
 
 
 class TrackingCapability(Enum):
@@ -158,8 +160,9 @@ class EngineSpecificSettings(NamedTuple):
 
     @classmethod
     def create_from_config(cls, engine_name: str, config_name: str = CONFIG_NAME) -> 'EngineSpecificSettings':
-        prefs = load_config(config_name).get('engines', {}).get(engine_name, {})
-        return cls.create_from_prefs(engine_name, prefs)
+        prefs = load_config(config_name)
+        val = prefs.get('engines', {}).get(engine_name, {})
+        return cls.create_from_prefs(engine_name, val)
 
     @property
     def as_dict(self) -> dict[str, object]:
@@ -183,7 +186,7 @@ class EngineSpecificSettings(NamedTuple):
         return ans
 
     def save_to_config(self, prefs:JSONConfig | None = None, config_name: str = CONFIG_NAME):
-        prefs = prefs or load_config(config_name)
+        prefs = load_config(config_name) if prefs is None else prefs
         val = self.as_dict
         engines = prefs.get('engines', {})
         if not val: