integrate static assets into webui command

pkgs/clan-cli/clan_cli/webui/server.py

@@ -1,12 +1,20 @@
 import argparse
+import logging
+import os
+import subprocess
 import time
 import urllib.request
 import webbrowser
+from contextlib import ExitStack, contextmanager
+from pathlib import Path
 from threading import Thread
+from typing import Iterator
 
 # XXX: can we dynamically load this using nix develop?
 from uvicorn import run
 
+logger = logging.getLogger(__name__)
+
 
 def defer_open_browser(base_url: str) -> None:
     for i in range(5):
@@ -18,15 +26,41 @@ def defer_open_browser(base_url: str) -> None:
     webbrowser.open(base_url)
 
 
+@contextmanager
+def spawn_node_dev_server() -> Iterator[None]:
+    logger.info("Starting node dev server...")
+    path = Path(__file__).parent.parent.parent.parent / "ui"
+    with subprocess.Popen(
+        ["direnv", "exec", path, "npm", "run", "dev"],
+        cwd=path,
+    ) as proc:
+        try:
+            yield
+        finally:
+            proc.terminate()
+
+
 def start_server(args: argparse.Namespace) -> None:
-    if not args.no_open:
-        Thread(
-            target=defer_open_browser, args=(f"http://[{args.host}]:{args.port}",)
-        ).start()
-    run(
-        "clan_cli.webui.app:app",
-        host=args.host,
-        port=args.port,
-        log_level=args.log_level,
-        reload=args.reload,
-    )
+    with ExitStack() as stack:
+        if args.dev:
+            os.environ["CLAN_WEBUI_ENV"] = "development"
+            os.environ["CLAN_WEBUI_DEV_PORT"] = str(args.dev_port)
+            os.environ["CLAN_WEBUI_DEV_HOST"] = args.dev_host
+
+            stack.enter_context(spawn_node_dev_server())
+
+            open_url = f"http://{args.dev_host}:{args.dev_port}"
+        else:
+            os.environ["CLAN_WEBUI_ENV"] = "production"
+            open_url = f"http://[{args.host}]:{args.port}"
+
+        if not args.no_open:
+            Thread(target=defer_open_browser, args=(open_url,)).start()
+
+        run(
+            "clan_cli.webui.app:app",
+            host=args.host,
+            port=args.port,
+            log_level=args.log_level,
+            reload=args.reload,
+        )