Cache aliases function / stub aliases property

jsonargparse/actions.py

@@ -39,6 +39,19 @@
 class Action(LoggerProperty, ArgparseAction):
     """Base for jsonargparse Action classes."""
 
+    @property
+    def aliases(self):
+        return _action_aliases(self)
+
+
+def _action_aliases(self):
+    if not hasattr(self, '_aliases'):
+        options = {optstr.lstrip('-').replace('-', '_')
+                   for optstr in self.option_strings}
+        options = {opt for opt in options if len(opt) > 1}
+        self._aliases =  {self.dest} | options
+    return self._aliases
+
 
 def _is_branch_key(parser, key: str) -> bool:
     root_key = split_key_root(key)[0]
@@ -70,10 +83,10 @@ def _find_action_and_subcommand(
         actions = [a for a in actions if not isinstance(a, exclude)]
     fallback_action = None
 
-    ALLOW_ALIAS = True
-
     for action in actions:
-        if action.dest == dest or (ALLOW_ALIAS and dest in get_alias_dest(action)):
+        # _StoreAction seems to break the property
+        # if dest in action.aliases:
+        if dest in _action_aliases(action):
             if isinstance(action, _ActionConfigLoad):
                 fallback_action = action
             else:
@@ -752,8 +765,5 @@ def handle_subcommands(
 
 
 def get_alias_dest(action):
-    def option_string_to_var(optstr):
-        " normalize a cli key as a variable "
-        return optstr.lstrip('-').replace('-', '_')
-
-    return [option_string_to_var(optstr) for optstr in action.option_strings]
+    return [optstr.lstrip('-').replace('-', '_')
+            for optstr in action.option_strings]