docs: add up/down key bindings to usage

When deafened, playback callback writes silence and
queue_playback discards incoming PCM.

docs/USAGE.md

@@ -11,15 +11,38 @@ tuimble --host mumble.example.com --user myname
 
 | Key | Action |
 |-----|--------|
-| `q` | Quit |
-| `space` | Push-to-talk (configurable) |
+| `F1` | Toggle self-deafen |
+| `F4` | Push-to-talk (configurable) |
 | `Enter` | Send message |
+| `Up` | Previous sent message (in chat input) |
+| `Down` | Next sent message (in chat input) |
+| `q` | Quit |
 | `Ctrl+C` | Quit |
 
 ## Push-to-Talk Modes
 
-- **hold** — hold key to transmit, release to stop (default)
-- **toggle** — press to start, press again to stop
+- **toggle** — press to start, press again to stop (default)
+- **hold** — hold key to transmit, release to stop (requires evdev)
+
+## Profiling
+
+```sh
+tuimble --cprofile                    # saves to ~/.config/tuimble/profile.prof
+tuimble --cprofile /tmp/tuimble.prof  # saves to custom path
+```
+
+Profile data is dumped every 30 seconds and on exit, so snapshots
+are available even after a crash or `kill`. Output is standard `.prof`
+format:
+
+```sh
+python3 -m pstats /tmp/tuimble.prof   # interactive explorer
+# or install snakeviz for a browser-based flamegraph:
+# pip install snakeviz && snakeviz /tmp/tuimble.prof
+```
+
+Note: cProfile captures the main thread only. Background workers
+started with `@work(thread=True)` are not included.
 
 ## Configuration
 

src/tuimble/__main__.py

@@ -1,13 +1,67 @@
 """Entry point for tuimble."""
 
+import argparse
 import sys
 
 
 def main():
+    parser = argparse.ArgumentParser(
+        prog="tuimble",
+        description="TUI client for Mumble",
+    )
+    parser.add_argument(
+        "--cprofile",
+        nargs="?",
+        const=None,
+        default=False,
+        metavar="FILE",
+        help="run under cProfile, saving to FILE "
+        "(default: ~/.config/tuimble/profile.prof)",
+    )
+    args = parser.parse_args()
+
     from tuimble.app import TuimbleApp
 
     app = TuimbleApp()
-    app.run()
+
+    if args.cprofile is not False:
+        _run_profiled(app, args.cprofile)
+    else:
+        app.run()
+
+
+def _run_profiled(app, dest):
+    """Run the app under cProfile with periodic 30s dumps."""
+    import cProfile
+    from pathlib import Path
+    from threading import Event, Thread
+
+    if dest is None:
+        from tuimble.config import CONFIG_DIR
+
+        dest = CONFIG_DIR / "profile.prof"
+    else:
+        dest = Path(dest)
+
+    dest.parent.mkdir(parents=True, exist_ok=True)
+
+    prof = cProfile.Profile()
+    stop = Event()
+
+    def _periodic_dump():
+        while not stop.wait(30):
+            prof.dump_stats(str(dest))
+
+    dumper = Thread(target=_periodic_dump, daemon=True)
+    dumper.start()
+
+    try:
+        prof.enable()
+        app.run()
+    finally:
+        prof.disable()
+        stop.set()
+        prof.dump_stats(str(dest))
 
 
 if __name__ == "__main__":

src/tuimble/app.py

@@ -53,6 +53,7 @@ class StatusBar(Static):
 
     ptt_active = reactive(False)
     connected = reactive(False)
+    self_deaf = reactive(False)
     server_info = reactive("")
 
     def render(self) -> str:
@@ -67,17 +68,20 @@ class StatusBar(Static):
 
         if self.ptt_active:
             ptt_sym = "[#e0af68]\u25cf[/]"
-            ptt_full = f"{ptt_sym} TX"
+            ptt_full = f"{ptt_sym} [bold]TX[/bold]"
         else:
             ptt_sym = "[#565f89]\u25cb[/]"
             ptt_full = f"{ptt_sym} idle"
 
+        deaf_sym = "[#f7768e]\u2298[/]" if self.self_deaf else ""
+        deaf_full = "[#f7768e]\u2298[/] deaf" if self.self_deaf else ""
+
         if w < 40:
-            return f" {conn_sym} {ptt_sym}"
+            return f" {conn_sym} {deaf_sym}{ptt_sym}"
         if w < 60:
-            return f" {conn_full}  {ptt_full}"
+            return f" {conn_full}  {deaf_full}{'  ' if deaf_full else ''}{ptt_full}"
         info = f"  [dim]{self.server_info}[/]" if self.server_info else ""
-        return f" {conn_full}  {ptt_full}{info}"
+        return f" {conn_full}  {deaf_full}{'  ' if deaf_full else ''}{ptt_full}{info}"
 
 
 class ChannelTree(Static):
@@ -187,7 +191,7 @@ class ChatLog(RichLog):
     """Message log."""
 
     def __init__(self, **kwargs) -> None:
-        super().__init__(markup=True, **kwargs)
+        super().__init__(markup=True, wrap=True, **kwargs)
 
 
 # -- main app ----------------------------------------------------------------
@@ -238,6 +242,7 @@ class TuimbleApp(App):
     """
 
     BINDINGS = [
+        ("f1", "toggle_deaf", "Deafen"),
         ("q", "quit", "Quit"),
         ("ctrl+c", "quit", "Quit"),
     ]
@@ -255,6 +260,9 @@ class TuimbleApp(App):
             username=srv.username,
             password=srv.password,
         )
+        self._history: list[str] = []
+        self._history_idx: int = -1
+        self._history_draft: str = ""
         acfg = self._config.audio
         self._audio = AudioPipeline(
             sample_rate=acfg.sample_rate,
@@ -357,6 +365,8 @@ class TuimbleApp(App):
         if not text:
             return
         event.input.clear()
+        self._history.append(text)
+        self._history_idx = -1
 
         if not self._client.connected:
             self._show_error("not connected")
@@ -406,27 +416,72 @@ class TuimbleApp(App):
         tree = self.query_one("#sidebar", ChannelTree)
         tree.set_state(channels, users_by_channel)
 
+    # -- deafen --------------------------------------------------------------
+
+    def action_toggle_deaf(self) -> None:
+        """Toggle self-deafen."""
+        deafened = not self._audio.deafened
+        self._audio.deafened = deafened
+        self._client.set_self_deaf(deafened)
+        status = self.query_one("#status", StatusBar)
+        status.self_deaf = deafened
+        chatlog = self.query_one("#chatlog", ChatLog)
+        if deafened:
+            chatlog.write("[#f7768e]\u2298 deafened[/]")
+        else:
+            chatlog.write("[#9ece6a]\u2713 undeafened[/]")
+
     # -- PTT -----------------------------------------------------------------
 
     def on_key(self, event: events.Key) -> None:
-        """Handle PTT key events."""
-        ptt_key = self._config.ptt.key
-
-        if isinstance(self._ptt, KittyPtt):
-            if event.key == ptt_key:
-                is_release = getattr(event, "key_type", None)
-                if is_release == "release":
-                    self._ptt.key_up()
+        """Handle input history navigation and PTT key events."""
+        focused = self.focused
+        if isinstance(focused, Input) and event.key in ("up", "down"):
+            inp = focused
+            if event.key == "up":
+                if not self._history:
+                    event.prevent_default()
+                    return
+                if self._history_idx == -1:
+                    self._history_draft = inp.value
+                    self._history_idx = len(self._history) - 1
+                elif self._history_idx > 0:
+                    self._history_idx -= 1
+                inp.value = self._history[self._history_idx]
+                inp.cursor_position = len(inp.value)
+            else:  # down
+                if self._history_idx == -1:
+                    event.prevent_default()
+                    return
+                if self._history_idx < len(self._history) - 1:
+                    self._history_idx += 1
+                    inp.value = self._history[self._history_idx]
                 else:
-                    self._ptt.key_down()
-        elif isinstance(self._ptt, TogglePtt):
-            if event.key == ptt_key:
-                self._ptt.toggle()
+                    self._history_idx = -1
+                    inp.value = self._history_draft
+                inp.cursor_position = len(inp.value)
+            event.prevent_default()
+            return
+
+        if event.key != self._config.ptt.key:
+            return
+
+        if isinstance(self._ptt, TogglePtt):
+            self._ptt.toggle()
+        elif isinstance(self._ptt, KittyPtt):
+            # Kitty hold-mode requires key-release events that Textual
+            # does not expose; kept for explicit backend="kitty" only.
+            self._ptt.key_down()
 
     def _on_ptt_change(self, transmitting: bool) -> None:
         self._audio.capturing = transmitting
         status = self.query_one("#status", StatusBar)
         status.ptt_active = transmitting
+        chatlog = self.query_one("#chatlog", ChatLog)
+        if transmitting:
+            chatlog.write("[#e0af68]● transmitting[/]")
+        else:
+            chatlog.write("[dim]○ stopped transmitting[/dim]")
 
     # -- resize --------------------------------------------------------------
 

src/tuimble/audio.py

@@ -39,6 +39,7 @@ class AudioPipeline:
         self._input_stream = None
         self._output_stream = None
         self._capturing = False
+        self._deafened = False
 
     def start(self):
         """Open audio streams."""
@@ -84,6 +85,14 @@ class AudioPipeline:
     def capturing(self, value: bool):
         self._capturing = value
 
+    @property
+    def deafened(self) -> bool:
+        return self._deafened
+
+    @deafened.setter
+    def deafened(self, value: bool):
+        self._deafened = value
+
     def _capture_callback(self, indata, frames, time_info, status):
         """Called by sounddevice when input data is available."""
         if status:
@@ -98,6 +107,9 @@ class AudioPipeline:
         """Called by sounddevice when output buffer needs data."""
         if status:
             log.warning("playback status: %s", status)
+        if self._deafened:
+            outdata[:] = b"\x00" * len(outdata)
+            return
         try:
             pcm = self._playback_queue.get_nowait()
             n = min(len(pcm), len(outdata))
@@ -116,6 +128,8 @@ class AudioPipeline:
 
     def queue_playback(self, pcm_data: bytes):
         """Queue raw PCM data for playback (16-bit, mono, 48kHz)."""
+        if self._deafened:
+            return
         try:
             self._playback_queue.put_nowait(pcm_data)
         except queue.Full:

src/tuimble/client.py

@@ -181,6 +181,14 @@ class MumbleClient:
         if self._mumble and self._connected:
             self._mumble.channels[channel_id].move_in()
 
+    def set_self_deaf(self, deaf: bool):
+        """Toggle self-deafen on the server."""
+        if self._mumble and self._connected:
+            if deaf:
+                self._mumble.users.myself.deafen()
+            else:
+                self._mumble.users.myself.undeafen()
+
     # -- pymumble callbacks (run on pymumble thread) -------------------------
 
     def _register_callbacks(self):

src/tuimble/config.py

@@ -28,8 +28,8 @@ class AudioConfig:
 
 @dataclass
 class PttConfig:
-    key: str = "space"
-    mode: str = "hold"  # hold | toggle
+    key: str = "f4"
+    mode: str = "toggle"  # toggle | hold (hold requires evdev)
     backend: str = "auto"  # auto | kitty | evdev | toggle
 
 

src/tuimble/ptt.py

@@ -139,6 +139,12 @@ def detect_backend(callback: Callback, preference: str = "auto") -> PttBackend:
     if preference == "toggle":
         return TogglePtt(callback)
 
-    # auto: try kitty first (will be validated at runtime by the app),
-    # then evdev, then toggle
-    return KittyPtt(callback)
+    # auto: Textual does not expose key-release events, so kitty
+    # hold-mode is not viable.  Try evdev, fall back to toggle.
+    try:
+        import evdev as _evdev  # noqa: F811
+
+        _ = _evdev.list_devices()
+        return EvdevPtt(callback)
+    except Exception:
+        return TogglePtt(callback)

tests/test_audio.py

@@ -10,6 +10,7 @@ def test_default_construction():
     assert ap._input_device is None
     assert ap._output_device is None
     assert ap.capturing is False
+    assert ap.deafened is False
 
 
 def test_custom_construction():
@@ -89,6 +90,37 @@ def test_queue_playback_overflow_drops():
     assert ap._playback_queue.qsize() == ap._playback_queue.maxsize
 
 
+def test_deafened_toggle():
+    ap = AudioPipeline()
+    assert ap.deafened is False
+    ap.deafened = True
+    assert ap.deafened is True
+    ap.deafened = False
+    assert ap.deafened is False
+
+
+def test_queue_playback_discards_when_deafened():
+    """Incoming PCM is dropped when deafened."""
+    ap = AudioPipeline()
+    ap.deafened = True
+    ap.queue_playback(b"\x42" * 100)
+    assert ap._playback_queue.qsize() == 0
+
+
+def test_playback_callback_silence_when_deafened():
+    """Playback callback writes silence when deafened, even with queued data."""
+    ap = AudioPipeline()
+    frame_bytes = FRAME_SIZE * 2
+    # Queue data before deafening
+    pcm = b"\x42" * frame_bytes
+    ap.queue_playback(pcm)
+    ap.deafened = True
+
+    outdata = bytearray(b"\xff" * frame_bytes)
+    ap._playback_callback(outdata, FRAME_SIZE, None, None)
+    assert outdata == bytearray(frame_bytes)  # all zeros
+
+
 def test_stop_without_start():
     """Stop on unstarted pipeline should not raise."""
     ap = AudioPipeline()

tests/test_client.py

@@ -1,5 +1,7 @@
 """Tests for MumbleClient dispatcher and callback wiring."""
 
+from unittest.mock import MagicMock
+
 from tuimble.client import MumbleClient
 
 
@@ -39,3 +41,29 @@ def test_dispatch_skips_none_callback():
     client = MumbleClient(host="localhost")
     # Should not raise
     client._dispatch(None)
+
+
+def test_set_self_deaf_calls_pymumble():
+    client = MumbleClient(host="localhost")
+    client._connected = True
+    myself = MagicMock()
+    users = MagicMock()
+    users.myself = myself
+    mumble = MagicMock()
+    mumble.users = users
+    client._mumble = mumble
+
+    client.set_self_deaf(True)
+    myself.deafen.assert_called_once()
+    myself.undeafen.assert_not_called()
+
+    myself.reset_mock()
+    client.set_self_deaf(False)
+    myself.undeafen.assert_called_once()
+    myself.deafen.assert_not_called()
+
+
+def test_set_self_deaf_noop_when_disconnected():
+    client = MumbleClient(host="localhost")
+    # Should not raise when not connected
+    client.set_self_deaf(True)

tests/test_config.py

@@ -8,7 +8,7 @@ def test_default_config():
     assert cfg.server.host == "localhost"
     assert cfg.server.port == 64738
     assert cfg.audio.sample_rate == 48000
-    assert cfg.ptt.mode == "hold"
+    assert cfg.ptt.mode == "toggle"
 
 
 def test_server_config():
@@ -19,5 +19,5 @@ def test_server_config():
 
 def test_ptt_config_defaults():
     ptt = PttConfig()
-    assert ptt.key == "space"
+    assert ptt.key == "f4"
     assert ptt.backend == "auto"