feat: check in workflow contract manifest

src/wf_contract_manifest/__main__.py

@@ -0,0 +1,40 @@
+from __future__ import annotations
+
+import argparse
+import sys
+from collections.abc import Sequence
+
+from .generate import generate_manifest
+from .io import (
+    DEFAULT_MANIFEST_PATH,
+    ManifestDriftError,
+    check_manifest,
+    write_manifest,
+)
+from .model import ManifestError
+
+
+def _parser() -> argparse.ArgumentParser:
+    parser = argparse.ArgumentParser(description="Manage the checked workflow API contract manifest.")
+    parser.add_argument("command", choices=("write", "check"))
+    return parser
+
+
+def main(argv: Sequence[str] | None = None) -> int:
+    args = _parser().parse_args(argv)
+    try:
+        manifest = generate_manifest()
+        if args.command == "write":
+            path = write_manifest(manifest, DEFAULT_MANIFEST_PATH)
+            print(f"wrote {path}")
+        else:
+            check_manifest(manifest, DEFAULT_MANIFEST_PATH)
+            print(f"checked {DEFAULT_MANIFEST_PATH}")
+    except (ManifestError, ManifestDriftError, ValueError) as error:
+        print(str(error), file=sys.stderr)
+        return 1
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())