placeholder implementation for serve command

Author: rycerzes

src/openenv_cli/__main__.py

@@ -15,7 +15,7 @@
 
 import typer
 
-from openenv_cli.commands import build, init, push, validate
+from openenv_cli.commands import build, init, push, serve, validate
 
 # Create the main CLI app
 app = typer.Typer(
@@ -35,6 +35,9 @@
 app.command(name="push", help="Push an OpenEnv environment to Hugging Face Spaces or custom registry")(
     push.push
 )
+app.command(name="serve", help="Serve environments locally (TODO: Phase 4)")(
+    serve.serve
+)
 
 
 # Entry point for setuptools

src/openenv_cli/commands/__init__.py

@@ -6,6 +6,6 @@
 
 """OpenEnv CLI commands."""
 
-from openenv_cli.commands import build, init, push, validate
+from . import build, init, push, serve, validate
 
-__all__ = ["build", "init", "push", "validate"]
+__all__ = ["build", "init", "push", "serve", "validate"]

src/openenv_cli/commands/serve.py

@@ -0,0 +1,94 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree.
+
+"""Serve OpenEnv environments locally (TO BE IMPLEMENTED)."""
+
+from __future__ import annotations
+
+from pathlib import Path
+from typing import Annotated
+
+import typer
+
+from .._cli_utils import console
+
+app = typer.Typer(help="Serve OpenEnv environments locally")
+
+
+@app.command()
+def serve(
+    env_path: Annotated[
+        str | None,
+        typer.Argument(
+            help="Path to the environment directory (default: current directory)"
+        ),
+    ] = None,
+    port: Annotated[
+        int,
+        typer.Option("--port", "-p", help="Port to serve on"),
+    ] = 8000,
+    host: Annotated[
+        str,
+        typer.Option("--host", help="Host to bind to"),
+    ] = "0.0.0.0",
+    reload: Annotated[
+        bool,
+        typer.Option("--reload", help="Enable auto-reload on code changes"),
+    ] = False,
+) -> None:
+    """
+    Serve an OpenEnv environment locally.
+
+    TODO: This command is currently not implemented and has been deferred for later.
+
+    Planned functionality:
+    - Run environment server locally without Docker
+    - Support multiple deployment modes (local, notebook, cluster)
+    - Auto-reload for development
+    - Integration with environment's [project.scripts] entry point
+
+    For now, use Docker-based serving:
+        1. Build the environment: openenv build
+        2. Run the container: docker run -p 8000:8000 <image-name>
+
+    Or use uv directly:
+        uv run --project . server --port 8000
+    """
+    console.print("[bold yellow]⚠ This command is not yet implemented[/bold yellow]\n")
+
+    console.print(
+        "The [bold cyan]openenv serve[/bold cyan] command has been deferred for later."
+    )
+
+    console.print("[bold]Alternative approaches:[/bold]\n")
+
+    console.print("[cyan]Option 1: Docker-based serving (recommended)[/cyan]")
+    console.print("  1. Build the environment:")
+    console.print("     [dim]$ openenv build[/dim]")
+    console.print("  2. Run the Docker container:")
+    console.print(
+        f"     [dim]$ docker run -p {port}:{port} openenv-<env-name>:latest[/dim]\n"
+    )
+
+    console.print("[cyan]Option 2: Direct execution with uv[/cyan]")
+
+    # Determine environment path
+    if env_path is None:
+        env_path_obj = Path.cwd()
+    else:
+        env_path_obj = Path(env_path)
+
+    # Check for openenv.yaml
+    openenv_yaml = env_path_obj / "openenv.yaml"
+    if openenv_yaml.exists():
+        console.print("  From your environment directory:")
+        console.print(f"     [dim]$ cd {env_path_obj}[/dim]")
+        console.print(f"     [dim]$ uv run --project . server --port {port}[/dim]\n")
+    else:
+        console.print("  From an environment directory with pyproject.toml:")
+        console.print(f"     [dim]$ uv run --project . server --port {port}[/dim]\n")
+
+    raise typer.Exit(0)