CLI (#12284)

Co-authored-by: Harrison Chase <hw.chase.17@gmail.com>

libs/cli/langchain_cli/cli.py

@@ -0,0 +1,36 @@
+import typer
+import subprocess
+from typing import Optional
+from typing_extensions import Annotated
+
+from langchain_cli.namespaces import hub
+from langchain_cli.namespaces import serve
+
+app = typer.Typer(no_args_is_help=True, add_completion=False)
+app.add_typer(hub.hub, name="hub", help=hub.__doc__)
+app.add_typer(serve.serve, name="serve", help=serve.__doc__)
+
+
+@app.command()
+def start(
+    *,
+    port: Annotated[
+        Optional[int], typer.Option(help="The port to run the server on")
+    ] = None,
+    host: Annotated[
+        Optional[str], typer.Option(help="The host to run the server on")
+    ] = None,
+) -> None:
+    """
+    Start the LangServe instance, whether it's a hub package or a serve project.
+    """
+    cmd = ["poetry", "run", "poe", "start"]
+    if port is not None:
+        cmd += ["--port", str(port)]
+    if host is not None:
+        cmd += ["--host", host]
+    subprocess.run(cmd)
+
+
+if __name__ == "__main__":
+    app()