Add distribution CLI scaffolding

llama_toolchain/cli/distribution/list.py

@@ -0,0 +1,52 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+import argparse
+
+from llama_toolchain.cli.subcommand import Subcommand
+from llama_toolchain.cli.table import print_table
+
+from llama_toolchain.distribution.registry import all_registered_distributions
+
+
+class DistributionList(Subcommand):
+
+    def __init__(self, subparsers: argparse._SubParsersAction):
+        super().__init__()
+        self.parser = subparsers.add_parser(
+            "list",
+            prog="llama distribution list",
+            description="Show available llama stack distributions",
+            formatter_class=argparse.RawTextHelpFormatter,
+        )
+        self._add_arguments()
+        self.parser.set_defaults(func=self._run_distribution_list_cmd)
+
+    def _add_arguments(self):
+        pass
+
+    def _run_distribution_list_cmd(self, args: argparse.Namespace) -> None:
+        # eventually, this should query a registry at llama.meta.com/llamastack/distributions
+        headers = [
+            "Name",
+            "Description",
+            "Dependencies",
+        ]
+
+        rows = []
+        for dist in all_registered_distributions():
+            rows.append(
+                [
+                    dist.name,
+                    dist.description,
+                    ", ".join(dist.pip_packages),
+                ]
+            )
+        print_table(
+            rows,
+            headers,
+            separate_rows=True,
+        )