[core] plugins: Add NodePluginStatus enum for NodePlugin objects

meshroom/core/plugins.py

@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import logging
 
+from enum import Enum
 from pathlib import Path
 
 from meshroom.common import BaseObject
@@ -19,6 +20,16 @@ class ProcessEnv(BaseObject):
         self.pythonPathFolders: list = [Path(folder)] + self.binPaths
 
 
+class NodePluginStatus(Enum):
+    """
+    Loading status for NodePlugin objects.
+    """
+    NOT_LOADED = 0  # The node plugin exists but is not loaded and cannot be used (not registered)
+    LOADED = 1  # The node plugin is currently loaded and functional (it has been registered)
+    DESC_ERROR = 2  # The node plugin exists but has an invalid description
+    ERROR = 3  # The node plugin exists and is valid but could not be successfully loaded
+
+
 class Plugin(BaseObject):
     """
     A collection of node plugins.