Initial upload: ErrorFix CLI with rule engine and pattern matching

errorfix/plugins/loader.py

@@ -0,0 +1,72 @@
+import sys
+from typing import List, Optional, Dict, Any
+
+from .plugin import Plugin, PluginRegistry
+
+
+class PluginLoader:
+    def __init__(self, registry: Optional[PluginRegistry] = None):
+        self.registry = registry or PluginRegistry()
+        self._entry_point_name = 'errorfix.plugins'
+
+    def load_entry_points(self) -> List[Plugin]:
+        plugins = []
+        try:
+            import importlib.metadata
+            eps = importlib.metadata.entry_points()
+            if hasattr(eps, 'select'):
+                entry_points = eps.select(group=self._entry_point_name)
+            else:
+                entry_points = eps.get(self._entry_point_name, [])
+
+            for ep in entry_points:
+                try:
+                    plugin_class = ep.load()
+                    plugin = plugin_class()
+                    self.registry.register(plugin)
+                    plugins.append(plugin)
+                except Exception as e:
+                    print(f"Warning: Failed to load plugin {ep.name}: {e}")
+        except Exception as e:
+            print(f"Warning: Could not load entry points: {e}")
+        return plugins
+
+    def load_plugin_module(self, module_name: str) -> Plugin:
+        module = __import__(module_name, fromlist=[''])
+        if not hasattr(module, 'register'):
+            raise ValueError(f"Module {module_name} does not have a 'register' function")
+
+        plugin = module.register()
+        if not isinstance(plugin, Plugin):
+            raise ValueError(f"register() must return a Plugin instance")
+
+        self.registry.register(plugin)
+        return plugin
+
+    def load_from_path(self, path: str) -> List[Plugin]:
+        import importlib.util
+
+        plugins = []
+        import os
+        if os.path.isdir(path):
+            for filename in os.listdir(path):
+                if filename.endswith('.py') and not filename.startswith('_'):
+                    module_name = filename[:-3]
+                    file_path = os.path.join(path, filename)
+                    spec = importlib.util.spec_from_file_location(module_name, file_path)
+                    if spec and spec.loader:
+                        module = importlib.util.module_from_spec(spec)
+                        spec.loader.exec_module(module)
+                        if hasattr(module, 'register'):
+                            plugin = module.register()
+                            if isinstance(plugin, Plugin):
+                                self.registry.register(plugin)
+                                plugins.append(plugin)
+        return plugins
+
+    def discover_and_load(self) -> List[Plugin]:
+        plugins = self.load_entry_points()
+        return plugins
+
+    def get_registry(self) -> PluginRegistry:
+        return self.registry