feat: no console drop when uninstalling backends

1 files changed, 12 insertions, 4 deletions

diff --git a/app/backends/qwen.py b/app/backends/qwen.py
index be7ebfe..c6a11bf 100644
--- a/app/backends/qwen.py
+++ b/app/backends/qwen.py
@@ -354,17 +354,25 @@ def _detect_remote(managed: bool = False):
     return remote_models, remote_urls
 
 
-def uninstall() -> int:
+def uninstall(*, emit=None, cancel=None) -> int:
     """Remove the qwen-tts backend entirely: stop its servers, pip uninstall.
 
     qwen-tts is a pip package (``qwen_tts`` + the ``qwen-tts-demo`` script)
     installed into the managed venv, so uninstalling it removes the backend.
-    Any server this tool started is stopped first (best-effort). Returns the
-    exit code.
+    Any server this tool started is stopped first (best-effort).
+
+    With EMIT given (the in-TUI task view) pip runs piped, streaming into
+    EMIT, so its output never touches the terminal behind curses. CANCEL is
+    a ``threading.Event`` honored between phases only (after the servers
+    have been stopped, before pip starts) — a started phase always completes,
+    so pip is never killed mid-run. Returns the exit code (130 when
+    cancelled before pip ran).
     """
     servers.stop("qwen-custom")
     servers.stop("qwen-clone")
-    rc = common.pip_uninstall([QWEN_PIP_PKG])
+    if common.cancel_requested(cancel):
+        return 130
+    rc = common.pip_uninstall([QWEN_PIP_PKG], emit=emit)
     if rc != 0:
         print(f"[WARNING] pip uninstall failed (exit {rc}); remove "
               f"{QWEN_PIP_PKG} from the managed venv manually")