markov: Add utility method for last access time update

* Chain.__touch() is a new function that updates the last time a markov
  chain was accessed
* Fix a bug that would not reliably update the last access time of the
  chain during Chain.add()

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

plugins/markov.py

@@ -44,11 +44,15 @@ class Chain:
         self.__last_access = 0.0
         self.__dirty = False
 
+    def __touch(self):
+        self.__last_access = asyncio.get_running_loop().time()
+
     @property
     def last_access(self) -> float:
         return self.__last_access
 
     def add(self, text: str):
+        self.__touch()
         parts: List[Any] = text.strip().split()
         if not parts:
             return
@@ -60,7 +64,7 @@ class Chain:
         self.__dirty = True
 
     def get(self, key: str) -> dict[str | None, int]:
-        self.__last_access = asyncio.get_running_loop().time()
+        self.__touch()
         if self.__cache:
             if key in self.__cache:
                 return self.__cache[key]
@@ -72,7 +76,7 @@ class Chain:
             return self.__cache[key]
 
     def set(self, key: str, value: Mapping[str | None, int]):
-        self.__last_access = asyncio.get_running_loop().time()
+        self.__touch()
         if not self.__cache:
             # Attempt the cache before writing to it
             self.__load()
@@ -80,7 +84,7 @@ class Chain:
         self.__dirty = True
 
     def __load(self):
-        self.__last_access = asyncio.get_running_loop().time()
+        self.__touch()
         if self.__cache:
             return
         if not self.path.exists():