Add --forge-ref-a1111-home cmd arg to reference existing A1111 checkout (#203)

* Add --forge-ref-a1111-home cmd arg to reference existing A1111 checkout

* nit

modules/cmd_args.py

@@ -2,6 +2,7 @@ import argparse
 import json
 import os
 from modules.paths_internal import models_path, script_path, data_path, extensions_dir, extensions_builtin_dir, sd_default_config, sd_model_file  # noqa: F401
+from pathlib import Path
 from ldm_patched.modules import args_parser
 
 parser = args_parser.parser
@@ -122,3 +123,23 @@ parser.add_argument('--timeout-keep-alive', type=int, default=30, help='set time
 parser.add_argument("--disable-all-extensions", action='store_true', help="prevent all extensions from running regardless of any other settings", default=False)
 parser.add_argument("--disable-extra-extensions", action='store_true', help="prevent all extensions except built-in from running regardless of any other settings", default=False)
 parser.add_argument("--skip-load-model-at-start", action='store_true', help="if load a model at web start, only take effect when --nowebui", )
+
+# Arguments added by forge.
+parser.add_argument(
+    '--forge-ref-a1111-home',
+    type=Path,
+    help="Look for models in an existing A1111 checkout's path",
+    default=None
+)
+parser.add_argument(
+    "--controlnet-dir",
+    type=Path,
+    help="Path to directory with ControlNet models",
+    default=None,
+)
+parser.add_argument(
+    "--controlnet-preprocessor-models-dir",
+    type=Path,
+    help="Path to directory with annotator model directories",
+    default=None,
+)