feat(cli): add stubs command

midas/cli/commands/__init__.py

@@ -4,5 +4,6 @@ from .format import format as format
 from .highlight import highlight as highlight
 from .parse import parse as parse
 from .registry import dump_registry as dump_registry
+from .stubs import stubs as stubs
 from .types import types as types
 from .validate import validate as validate

midas/cli/commands/stubs.py

@@ -0,0 +1,27 @@
+import ast
+from pathlib import Path
+from typing import TextIO
+
+import click
+
+from midas.checker.checker import TypeChecker
+from midas.generator.stubs import StubsGenerator
+
+
+@click.command(help="Generate stubs from Midas definitions")
+@click.argument("file", type=click.File("r"))
+@click.option("-o", "--output", type=click.File("w"), default="-")
+def stubs(
+    file: TextIO,
+    output: TextIO,
+):
+    source_path: Path = Path(file.name).resolve()
+
+    checker = TypeChecker()
+    checker.import_midas(source_path)
+
+    generator = StubsGenerator(checker.types)
+    module: ast.Module = generator.generate_stubs()
+    module = ast.fix_missing_locations(module)
+
+    output.write(ast.unparse(module))

midas/cli/main.py

@@ -18,6 +18,7 @@ midas.add_command(commands.highlight)
 midas.add_command(commands.parse)
 midas.add_command(commands.dump_registry)
 midas.add_command(commands.types)
+midas.add_command(commands.stubs)
 midas.add_command(commands.validate)