lazy manage history

mycroft/skills/intent_services/converse_service.py

@@ -24,14 +24,17 @@ def activate_skill(self, skill_id):
         self.deactivate_skill(skill_id)
         # add skill with timestamp to start of active list
         self.active_skills.insert(0, [skill_id, time.time()])
+        self._prune_history()
 
     def deactivate_skill(self, skill_id):
         active_ids = [s[0] for s in self.active_skills]
         if skill_id in active_ids:
             idx = active_ids.index(skill_id)
             self.active_skills.pop(idx)
+        self._prune_history()
 
     def is_active(self, skill_id):
+        self._prune_history()
         active_ids = [s[0] for s in self.active_skills]
         return skill_id in active_ids
 
@@ -49,6 +52,7 @@ def clear(self):
         self.history = []  # [Message , timestamp]
 
     def as_dict(self):
+        self._prune_history()
         return {
             "active_skills": self.active_skills,
             "session_id": self.session_id,