feat: tui backend server progress and generate script progress

1 files changed, 34 insertions, 2 deletions

diff --git a/app/backends/__init__.py b/app/backends/__init__.py
index 9e8bf31..488c36e 100644
--- a/app/backends/__init__.py
+++ b/app/backends/__init__.py
@@ -24,6 +24,7 @@ automatically.
 
 import shlex
 from dataclasses import dataclass, field
+from pathlib import Path
 from typing import Callable, Dict, List, Optional
 
 
@@ -35,10 +36,24 @@ class ServerSpec:
     on separate ports). ARGV is the exact command line the hub spawns (using
     the managed venv's absolute binaries, so no shell activation is needed);
     URL is the endpoint ``common.server_running`` probes to decide readiness.
+
+    CWD is the working directory the server is spawned in. It matters for
+    servers that discover resources relative to their process working
+    directory (audio.cpp resolves ``model_specs/<family>.json`` by walking up
+    from its cwd), so the hub starts them from their checkout root. None
+    inherits the hub's cwd (today's behavior).
+
+    IDENTITY is the ``backends.probe.IDENTITY_*`` constant the server is
+    expected to answer as once it is truly ready. When set, ``servers.start``
+    waits for the server to answer HTTP with that identity — not merely to
+    accept TCP connections — so "listening but still starting" servers are
+    caught. None keeps the plain TCP-connect readiness check.
     """
     name: str
     url: str
     argv: List[str]
+    cwd: Optional[Path] = None
+    identity: Optional[str] = None
 
 
 @dataclass
@@ -72,6 +87,12 @@ class BackendStatus:
     RUNNING_MODELS names which of a multi-server backend's models answered
     (qwen: "Base" and/or "CustomVoice", local and remote combined), shown in
     parentheses in the hub's status table.
+
+    MODELS_MISSING says the server config references model files that are not
+    on disk (e.g. an audio.cpp server.json entry whose ``path`` was never
+    downloaded); DETAILS then names them. The backend still counts as ready
+    (the hub surfaces the warning), but a conversion would fail until the
+    models are installed.
     """
     key: str
     label: str
@@ -86,6 +107,7 @@ class BackendStatus:
     remote: bool = False
     remote_urls: Dict[str, str] = field(default_factory=dict)
     remote_models: List[str] = field(default_factory=list)
+    models_missing: bool = False
 
     @property
     def ready(self) -> bool:
@@ -94,8 +116,18 @@ class BackendStatus:
 
 
 def format_launch_hint(servers: List[ServerSpec]) -> str:
-    """Join a backend's server argvs into a copy-pasteable launch hint."""
-    return " ; ".join(shlex.join(s.argv) for s in servers)
+    """Join a backend's server argvs into a copy-pasteable launch hint.
+
+    A server with a CWD is prefixed with ``cd <cwd> &&`` so the hint works
+    pasted into a shell (the server relies on that working directory).
+    """
+    parts = []
+    for server in servers:
+        command = shlex.join(server.argv)
+        if server.cwd is not None:
+            command = f"cd {shlex.quote(str(server.cwd))} && {command}"
+        parts.append(command)
+    return " ; ".join(parts)
 
 
 @dataclass