Add yarn dev command from #7183 to manage.py

netbox/extras/management/commands/dev.py

@@ -0,0 +1,22 @@
+import typing as t
+import threading
+from django.core.management import call_command
+from django.contrib.staticfiles.management.commands import runserver
+
+
+class Command(runserver.Command):
+    """Run the NetBox development server.
+
+    Builds UI source files, runs `collectstatic`, starts the Django development web server, and
+    watches UI source files for changes.
+    """
+
+    def handle(self, *args: t.Any, **options: t.Any) -> t.Optional[str]:
+        # Run the UI development server in a separate thread so file watching doesn't block the
+        # Django development server running in the main thread.
+        ui_dev = threading.Thread(name="uidev", target=lambda: call_command("uidev"))
+        ui_dev.start()
+        # Run `collectstatic`.
+        call_command("collectstatic", interactive=False)
+        # Run the original `runserver` command.
+        return super().handle(*args, **options)

netbox/extras/management/commands/uidev.py

@@ -0,0 +1,37 @@
+import shutil
+import subprocess
+import typing as t
+from pathlib import Path
+from django.core.management.base import BaseCommand, CommandError
+
+
+class Command(BaseCommand):
+    """Provide access to the underlying UI development server."""
+
+    def handle(self, *args: t.Any, **options: t.Any) -> t.Optional[str]:
+        """Run the `npm run dev` command via a separate process and write the output."""
+
+        project_root = Path(__file__).parent.parent.parent.parent
+        project_static = project_root / "project-static"
+
+        npm = shutil.which("npm")
+        npm_args = tuple(str(i) for i in (npm, "--prefix", project_static, "run", "--silent", "dev"))
+
+        try:
+            self.stdout.write(self.style.SUCCESS("Watching UI files..."))
+            proc = subprocess.Popen(
+                args=npm_args,
+                stdout=subprocess.PIPE,
+                stderr=subprocess.STDOUT,
+                cwd=project_static,
+            )
+            while True:
+                out = proc.stdout.readline().decode()
+                if out == '' and proc.poll() is not None:
+                    break
+                if out:
+                    self.stdout.write(out.strip())
+
+        except BaseException as exc:
+            proc.kill()
+            raise CommandError("Error while running command '{}'".format(" ".join(npm_args))) from exc