refactor: fix several memory leaks and improve UX by exposing microphone selection etc.

calliope/app.py

@@ -11,6 +11,8 @@ os.environ.setdefault("TOKENIZERS_PARALLELISM", "false")
 # Run offline — models are downloaded during setup, no need to hit HuggingFace on every launch.
 os.environ.setdefault("HF_HUB_OFFLINE", "1")
 
+import subprocess
+
 import rumps
 
 from calliope import config as config_mod
@@ -36,6 +38,7 @@ class CalliopeApp(rumps.App):
         self.recorder = Recorder(device=cfg.get("device"))
         self.transcriber = Transcriber(
             model=cfg.get("model", "distil-whisper/distil-large-v3"),
+            silence_threshold=cfg.get("silence_threshold", 0.005),
         )
         self.transcriber.context = cfg.get("context", "")
         self.transcriber.language = cfg.get("language", "auto")
@@ -44,11 +47,15 @@ class CalliopeApp(rumps.App):
         self._rec_lock = threading.Lock()
         self._rec_start_time: float | None = None
         self._rec_timer: rumps.Timer | None = None
+        self._transcribe_done = threading.Event()
+        self._transcribe_done.set()  # not transcribing initially
 
         self.status_item = rumps.MenuItem("Status: Loading model...")
         self.status_item.set_callback(None)
         self.toggle_item = rumps.MenuItem("Start Recording", callback=self._on_toggle_click)
-        self.context_item = rumps.MenuItem("Set Whisper Context...", callback=self._on_set_context)
+        ctx = cfg.get("context", "")
+        context_label = f"Set Whisper Context... ({ctx[:20]}...)" if ctx else "Set Whisper Context..."
+        self.context_item = rumps.MenuItem(context_label, callback=self._on_set_context)
 
         # Language submenu
         self._lang_menu = rumps.MenuItem("Language")
@@ -67,6 +74,19 @@ class CalliopeApp(rumps.App):
             item = rumps.MenuItem(f"{prefix}{short}", callback=self._on_model_select)
             self._model_menu.add(item)
 
+        # Microphone submenu
+        self._mic_menu = rumps.MenuItem("Microphone")
+        self._build_mic_menu()
+
+        # Typing mode submenu
+        self._typing_menu = rumps.MenuItem("Typing Mode")
+        current_mode = cfg.get("typing_mode", "char")
+        for mode, label in [("char", "Character (CGEvents)"), ("clipboard", "Clipboard (Cmd+V)")]:
+            prefix = "\u2713 " if mode == current_mode else "   "
+            item = rumps.MenuItem(f"{prefix}{label}", callback=self._on_typing_mode_select)
+            item._typing_mode = mode
+            self._typing_menu.add(item)
+
         quit_item = rumps.MenuItem("Quit Calliope", callback=self._on_quit)
 
         self.menu = [
@@ -76,6 +96,8 @@ class CalliopeApp(rumps.App):
             self.context_item,
             self._lang_menu,
             self._model_menu,
+            self._mic_menu,
+            self._typing_menu,
             None,
             quit_item,
         ]
@@ -92,19 +114,34 @@ class CalliopeApp(rumps.App):
         # Load model in background
         threading.Thread(target=self._load_model, daemon=True).start()
 
+    def _notify(self, title: str, subtitle: str, message: str) -> None:
+        if not self.cfg.get("notifications", True):
+            return
+        try:
+            text = f"{subtitle} — {message}" if subtitle else message
+            script = f'display notification "{text}" with title "{title}"'
+            subprocess.Popen(
+                ["osascript", "-e", script],
+                stdout=subprocess.DEVNULL,
+                stderr=subprocess.DEVNULL,
+            )
+        except Exception:
+            pass
+
+    def _ready_status(self) -> str:
+        short = self.transcriber.model.split("/")[-1]
+        return f"Status: Ready ({short})"
+
     def _load_model(self) -> None:
         try:
             self.transcriber.load()
-            self.status_item.title = "Status: Ready"
+            self.status_item.title = self._ready_status()
             self.hotkeys.start()
             log.info("Model loaded, hotkeys active")
         except Exception:
             log.error("Failed to load model", exc_info=True)
             self.status_item.title = "Status: Model load failed"
-            try:
+            self._notify("Calliope", "Error", "Failed to load Whisper model. Check logs.")
-                rumps.notification("Calliope", "Error", "Failed to load Whisper model. Check logs.")
-            except RuntimeError:
-                pass
 
     @staticmethod
     def _activate_app():
@@ -125,20 +162,23 @@ class CalliopeApp(rumps.App):
         response = rumps.Window(
             message="Provide context to help Whisper with domain-specific terms, "
             "names, or jargon. For example:\n\n"
-            "\"Meeting about Kubernetes, gRPC, and the Istio service mesh.\"",
+            "\"Meeting about Kubernetes, gRPC, and the Istio service mesh.\"\n\n"
+            "Clear the field and press Save to remove context.",
             title="Set Whisper Context",
             default_text=self.transcriber.context,
             ok="Save",
-            cancel="Clear",
+            cancel="Cancel",
             dimensions=(320, 120),
         ).run()
-        if response.clicked == 1:  # Save
+        if response.clicked != 1:  # Cancel / Escape
+            self._deactivate_app()
+            return
         self.transcriber.context = response.text.strip()
-        else:  # Clear
-            self.transcriber.context = ""
         self._deactivate_app()
         ctx = self.transcriber.context
         self.context_item.title = f"Set Whisper Context... ({ctx[:20]}...)" if ctx else "Set Whisper Context..."
+        self.cfg["context"] = ctx
+        config_mod.save(self.cfg)
 
     def _on_language_select(self, sender) -> None:
         display_name = sender.title.strip().lstrip("\u2713").strip()
@@ -170,19 +210,68 @@ class CalliopeApp(rumps.App):
         config_mod.save(self.cfg)
         self.status_item.title = "Status: Loading model..."
         self.hotkeys.stop()
+
+        def _switch():
+            self._transcribe_done.wait()  # wait for in-flight transcription
             self._release_transcriber()
-        self.transcriber = Transcriber(model=model_id)
+            self.transcriber = Transcriber(
+                model=model_id,
+                silence_threshold=self.cfg.get("silence_threshold", 0.005),
+            )
             self.transcriber.context = self.cfg.get("context", "")
             self.transcriber.language = self.cfg.get("language", "auto")
-        threading.Thread(target=self._load_model, daemon=True).start()
+            self._load_model()
+
+        threading.Thread(target=_switch, daemon=True).start()
         log.info("Switching model to %s", model_id)
 
+    def _build_mic_menu(self) -> None:
+        """Populate the microphone submenu with available input devices."""
+        import sounddevice as sd
+        current_device = self.cfg.get("device")
+        # System default
+        prefix = "\u2713 " if current_device is None else "   "
+        item = rumps.MenuItem(f"{prefix}System Default", callback=self._on_mic_select)
+        self._mic_menu.add(item)
+        # List input devices
+        for dev in sd.query_devices():
+            if dev["max_input_channels"] > 0:
+                idx = dev["index"]
+                name = dev["name"]
+                prefix = "\u2713 " if current_device == idx else "   "
+                item = rumps.MenuItem(f"{prefix}{name}", callback=self._on_mic_select)
+                item._device_index = idx
+                self._mic_menu.add(item)
+
+    def _on_mic_select(self, sender) -> None:
+        name = sender.title.strip().lstrip("\u2713").strip()
+        device_index = getattr(sender, "_device_index", None)
+        self.recorder._device = device_index
+        self.cfg["device"] = device_index
+        config_mod.save(self.cfg)
+        # Update checkmarks
+        for item in self._mic_menu.values():
+            item_name = item.title.strip().lstrip("\u2713").strip()
+            item.title = f"\u2713 {item_name}" if item_name == name else f"   {item_name}"
+        log.info("Microphone set to %s (device=%s)", name, device_index)
+
+    def _on_typing_mode_select(self, sender) -> None:
+        mode = sender._typing_mode
+        self.cfg["typing_mode"] = mode
+        config_mod.save(self.cfg)
+        for item in self._typing_menu.values():
+            label = item.title.strip().lstrip("\u2713").strip()
+            item.title = f"\u2713 {label}" if getattr(item, "_typing_mode", None) == mode else f"   {label}"
+        log.info("Typing mode set to %s", mode)
+
     def _release_transcriber(self) -> None:
         """Free the current Whisper model to reclaim GPU memory."""
+        import gc
+        import torch
         if self.transcriber is not None:
             self.transcriber._pipe = None
             self.transcriber._tokenizer = None
-        import torch
+        gc.collect()
         if torch.backends.mps.is_available():
             torch.mps.empty_cache()
 
@@ -214,18 +303,12 @@ class CalliopeApp(rumps.App):
             self.title = "\U0001f3a4"  # 🎤
             self.toggle_item.title = "Start Recording"
             self.status_item.title = "Status: Mic error (check device)"
-            try:
+            self._notify("Calliope", "", "Microphone unavailable — check audio device")
-                rumps.notification("Calliope", "", "Microphone unavailable — check audio device")
-            except RuntimeError:
-                pass
             return
         self.overlay.show()
         self._rec_timer = rumps.Timer(self._update_rec_duration, 1)
         self._rec_timer.start()
-        try:
+        self._notify("Calliope", "", "Recording started")
-            rumps.notification("Calliope", "", "Recording started")
-        except RuntimeError:
-            pass  # Info.plist missing CFBundleIdentifier
         log.info("Recording started")
 
     def _stop_and_transcribe(self) -> None:
@@ -238,36 +321,45 @@ class CalliopeApp(rumps.App):
             self._rec_timer = None
         duration = int(time.time() - self._rec_start_time) if self._rec_start_time else 0
         self._rec_start_time = None
-        self.title = "\U0001f3a4"  # 🎤
+        self.title = "\u23f3"  # ⏳
         self.toggle_item.title = "Start Recording"
         self.status_item.title = "Status: Transcribing..."
         self.overlay.show_transcribing()
 
         audio = self.recorder.stop()
-        try:
+        self._notify("Calliope", "", f"Recording stopped ({duration}s)")
-            rumps.notification("Calliope", "", f"Recording stopped ({duration}s)")
-        except RuntimeError:
-            pass
         log.info("Recording stopped, %d samples", audio.size)
+        self._transcribe_done.clear()
         threading.Thread(target=self._transcribe_and_type, args=(audio,), daemon=True).start()
 
     def _update_rec_duration(self, timer) -> None:
         if self._rec_start_time is None:
             return
         elapsed = int(time.time() - self._rec_start_time)
+        max_dur = self.cfg.get("max_recording_seconds", 300)
+        if max_dur and elapsed >= max_dur:
+            log.info("Max recording duration reached (%ds)", max_dur)
+            self._stop_and_transcribe()
+            return
         minutes, seconds = divmod(elapsed, 60)
         self.title = f"\U0001f534 {minutes}:{seconds:02d}"
 
     def _transcribe_and_type(self, audio) -> None:
         try:
             text = self.transcriber.transcribe(audio)
+            if not text:
+                self.overlay.hide()
+                self.title = "\U0001f3a4"  # 🎤
+                self.status_item.title = self._ready_status()
+                self._notify("Calliope", "", "No speech detected — audio too short or too quiet")
+                return
             if text:
                 def _do_type():
                     try:
                         if self.cfg.get("typing_mode", "char") == "clipboard":
                             type_text_clipboard(text)
                         else:
-                            type_text(text)
+                            type_text(text, delay=self.cfg.get("typing_delay", 0.005))
                         print(f"\n[Calliope] {text}")
                         log.info("Typed %d chars", len(text))
                     except Exception:
@@ -275,15 +367,15 @@ class CalliopeApp(rumps.App):
                 from PyObjCTools.AppHelper import callAfter
                 callAfter(_do_type)
             self.overlay.hide()
-            self.status_item.title = "Status: Ready"
+            self.status_item.title = self._ready_status()
         except Exception:
             log.error("Transcription failed", exc_info=True)
             self.overlay.hide()
-            self.status_item.title = "Status: Ready"
+            self.status_item.title = self._ready_status()
-            try:
+            self._notify("Calliope", "Error", "Transcription failed. Check logs.")
-                rumps.notification("Calliope", "Error", "Transcription failed. Check logs.")
+        finally:
-            except RuntimeError:
+            self.title = "\U0001f3a4"  # 🎤
-                pass
+            self._transcribe_done.set()
 
     def _on_quit(self, sender) -> None:
         self.hotkeys.stop()

calliope/config.py

@@ -22,6 +22,10 @@ DEFAULTS: dict[str, Any] = {
     "context": "",
     "debug": False,
     "typing_mode": "char",  # "char" or "clipboard"
+    "max_recording_seconds": 300,  # 5 minutes
+    "silence_threshold": 0.005,  # RMS energy below which audio is considered silence
+    "notifications": True,  # show macOS notifications
+    "typing_delay": 0.005,  # seconds between keystrokes in char mode
 }
 
 LANGUAGES: dict[str, str] = {

calliope/hotkeys.py

@@ -14,21 +14,53 @@ _KEY_MAP: dict[str, keyboard.Key] = {
     "alt": keyboard.Key.alt,
     "cmd": keyboard.Key.cmd,
     "space": keyboard.Key.space,
+    "tab": keyboard.Key.tab,
+    "esc": keyboard.Key.esc,
+    "enter": keyboard.Key.enter,
+    "backspace": keyboard.Key.backspace,
+    "delete": keyboard.Key.delete,
+}
+
+# Add function keys F1-F12
+for _i in range(1, 13):
+    _KEY_MAP[f"f{_i}"] = getattr(keyboard.Key, f"f{_i}")
+
+# Virtual keycodes for left/right modifier normalization (macOS)
+_VK_NORMALIZE = {
+    0x3B: keyboard.Key.ctrl,   # left ctrl
+    0x3E: keyboard.Key.ctrl,   # right ctrl
+    0x38: keyboard.Key.shift,  # left shift
+    0x3C: keyboard.Key.shift,  # right shift
+    0x3A: keyboard.Key.alt,    # left alt/option
+    0x3D: keyboard.Key.alt,    # right alt/option
+    0x37: keyboard.Key.cmd,    # left cmd
+    0x36: keyboard.Key.cmd,    # right cmd
 }
 
 
-def _parse_combo(combo: str) -> set[keyboard.Key]:
+def _parse_combo(combo: str) -> set:
-    """Parse 'ctrl+shift' into a set of pynput keys."""
+    """Parse 'ctrl+shift' or 'ctrl+r' into a set of pynput keys."""
-    keys: set[keyboard.Key] = set()
+    keys: set = set()
     for part in combo.lower().split("+"):
         part = part.strip()
         if part in _KEY_MAP:
             keys.add(_KEY_MAP[part])
+        elif len(part) == 1:
+            keys.add(keyboard.KeyCode.from_char(part))
         else:
             log.warning("Unknown key in combo: %s", part)
     return keys
 
 
+def _check_accessibility() -> bool:
+    """Check if Accessibility permission is currently granted."""
+    try:
+        from ApplicationServices import AXIsProcessTrusted
+        return AXIsProcessTrusted()
+    except Exception:
+        return True  # assume granted if we can't check
+
+
 class HotkeyListener:
     def __init__(
         self,
@@ -51,6 +83,8 @@ class HotkeyListener:
         log.debug("PTT keys: %s, Toggle keys: %s", self._ptt_keys, self._toggle_keys)
 
     def start(self) -> None:
+        if not _check_accessibility():
+            log.error("Accessibility permission not granted — hotkeys will not work")
         self._pressed.clear()
         self._ptt_active = False
         self._toggle_active = False
@@ -75,21 +109,27 @@ class HotkeyListener:
     def _normalize(self, key) -> keyboard.Key | keyboard.KeyCode:
         if hasattr(key, "value") and hasattr(key.value, "vk"):
             vk = key.value.vk
-            if vk in (0x3B, 0x3E):
+            normalized = _VK_NORMALIZE.get(vk)
-                return keyboard.Key.ctrl
+            if normalized is not None:
-            if vk in (0x38, 0x3C):
+                return normalized
-                return keyboard.Key.shift
+        # Normalize character keys to lowercase
+        if isinstance(key, keyboard.KeyCode) and key.char is not None:
+            return keyboard.KeyCode.from_char(key.char.lower())
         return key
 
     def _on_press(self, key) -> None:
         key = self._normalize(key)
         self._pressed.add(key)
 
+        # Check PTT first; if PTT fires, skip toggle to prevent double-trigger
         if self._ptt_keys.issubset(self._pressed) and not self._ptt_active:
             self._ptt_active = True
             self._on_ptt_start()
+            return
 
         if self._toggle_keys.issubset(self._pressed) and not self._toggle_active:
+            # Don't fire toggle if PTT is active
+            if not self._ptt_active:
                 self._toggle_active = True
                 self._on_toggle()
 

calliope/overlay.py

@@ -109,18 +109,28 @@ class WaveformView(NSView):
         if not amps:
             return
 
-        step = draw_w / max(len(amps) - 1, 1)
+        # Draw centered: newest sample at center, older samples outward, mirrored
+        half_bars = len(amps)
+        mid_x = w / 2
+        step = (draw_w / 2) / max(half_bars - 1, 1)
 
         for sign in (1, -1):
             line = NSBezierPath.bezierPath()
             line.setLineWidth_(1.5)
+            # Left half: oldest at left edge, newest at center
             for i, a in enumerate(amps):
-                x = padding + i * step
+                x = mid_x - (half_bars - 1 - i) * step
                 y_off = a * draw_h * sign
                 if i == 0:
                     line.moveToPoint_((x, mid_y + y_off))
                 else:
                     line.lineToPoint_((x, mid_y + y_off))
+            # Right half: mirror (newest at center, oldest at right edge)
+            for i in range(1, half_bars):
+                a = amps[half_bars - 1 - i]
+                x = mid_x + i * step
+                y_off = a * draw_h * sign
+                line.lineToPoint_((x, mid_y + y_off))
             line.stroke()
 
         self._draw_label("calliope recording...")
@@ -252,8 +262,17 @@ class WaveformOverlay:
         """Switch overlay to transcribing state (pulsing dots)."""
         callAfter(self._show_transcribing_on_main)
 
+    def _reposition_panel(self):
+        """Move the panel to the top-center of the current main screen."""
+        screen = NSScreen.mainScreen()
+        screen_frame = screen.frame()
+        x = (screen_frame.size.width - WIDTH) / 2
+        y = screen_frame.size.height - HEIGHT - 40
+        self._panel.setFrameOrigin_(NSMakePoint(x, y))
+
     def _show_on_main(self):
         self._ensure_panel()
+        self._reposition_panel()
         self._view.stopFade()
         self._view.mode = OverlayMode.RECORDING
         self._view.amplitudes = deque([0.0] * NUM_BARS, maxlen=NUM_BARS)
@@ -265,6 +284,7 @@ class WaveformOverlay:
 
     def _show_transcribing_on_main(self):
         self._ensure_panel()
+        self._reposition_panel()
         self._view.stopFade()
         self._view.mode = OverlayMode.TRANSCRIBING
         self._view._pulse_start = time.monotonic()

calliope/transcriber.py

@@ -10,12 +10,23 @@ log = logging.getLogger(__name__)
 
 
 class Transcriber:
-    def __init__(self, model: str = "distil-whisper/distil-large-v3"):
+    def __init__(self, model: str = "distil-whisper/distil-large-v3", silence_threshold: float = 0.005):
         self.model = model
         self._pipe = None
         self._tokenizer = None
-        self.context: str = ""
+        self._context: str = ""
+        self._cached_prompt_ids = None
         self.language: str = "auto"
+        self.silence_threshold = silence_threshold
+
+    @property
+    def context(self) -> str:
+        return self._context
+
+    @context.setter
+    def context(self, value: str) -> None:
+        self._context = value
+        self._cached_prompt_ids = None  # invalidate cache
 
     def load(self) -> None:
         from transformers import AutoTokenizer
@@ -32,7 +43,12 @@ class Transcriber:
                 device=device,
             )
             self._tokenizer = AutoTokenizer.from_pretrained(self.model)
-            log.info("Model loaded successfully")
+            log.info("Model loaded, running warmup...")
+            self._pipe(
+                {"raw": np.zeros(16_000, dtype=np.float32), "sampling_rate": 16_000},
+                batch_size=1,
+            )
+            log.info("Model ready")
         except Exception:
             log.error("Failed to load model %s", self.model, exc_info=True)
             raise
@@ -48,18 +64,18 @@ class Transcriber:
         duration = audio.size / 16_000
         energy = float(np.sqrt(np.mean(audio ** 2)))
         log.debug("Audio: %.1fs, RMS energy: %.6f", duration, energy)
-        if duration < 1.0 or energy < 0.005:
+        if duration < 1.0 or energy < self.silence_threshold:
             log.debug("Audio too short or too quiet, skipping transcription")
             return ""
 
         generate_kwargs = {}
-        if self.context:
+        if self._context:
-            prompt_ids = self._tokenizer.get_prompt_ids(self.context)
+            if self._cached_prompt_ids is None:
-            generate_kwargs["prompt_ids"] = prompt_ids
+                self._cached_prompt_ids = self._tokenizer.get_prompt_ids(self._context)
+            generate_kwargs["prompt_ids"] = self._cached_prompt_ids
 
         pipe_kwargs = {
-            "batch_size": 4,
+            "batch_size": 1,
-            "return_timestamps": True,
             "generate_kwargs": generate_kwargs,
         }
         if self.language != "auto":

calliope/typer.py

@@ -1,7 +1,6 @@
 """Type text into the focused field using Quartz CGEvents."""
 
 import logging
-import subprocess
 import time
 
 import Quartz
@@ -9,36 +8,51 @@ import Quartz
 log = logging.getLogger(__name__)
 
 
-def type_text(text: str) -> None:
+def type_text(text: str, delay: float = 0.005) -> None:
     """Simulate typing text into the currently focused text field."""
     for char in text:
         _type_char(char)
-        time.sleep(0.005)
+        time.sleep(delay)
 
 
 def type_text_clipboard(text: str) -> None:
     """Type text by copying to clipboard and pasting with Cmd+V.
 
-    Saves and restores the previous clipboard contents.
+    Saves and restores the previous clipboard contents, including non-text
+    data like images and files.
     """
-    # Save current clipboard
+    from AppKit import NSPasteboard, NSStringPboardType
-    try:
-        prev = subprocess.run(
-            ["pbpaste"], capture_output=True, text=True, timeout=2,
-        ).stdout
-    except Exception:
-        prev = None
 
-    # Copy text to clipboard
+    pb = NSPasteboard.generalPasteboard()
-    subprocess.run(["pbcopy"], input=text, text=True, timeout=2)
 
-    # Paste with Cmd+V
+    # Save all current pasteboard items
+    saved_items = []
+    for item in pb.pasteboardItems() or []:
+        item_data = {}
+        for ptype in item.types():
+            data = item.dataForType_(ptype)
+            if data is not None:
+                item_data[ptype] = data
+        if item_data:
+            saved_items.append(item_data)
+
+    # Set our text and paste
+    pb.clearContents()
+    pb.setString_forType_(text, NSStringPboardType)
     _cmd_v()
     time.sleep(0.05)
 
-    # Restore previous clipboard
+    # Restore previous clipboard contents
-    if prev is not None:
+    if saved_items:
-        subprocess.run(["pbcopy"], input=prev, text=True, timeout=2)
+        from AppKit import NSPasteboardItem
+        pb.clearContents()
+        new_items = []
+        for item_data in saved_items:
+            item = NSPasteboardItem.alloc().init()
+            for ptype, data in item_data.items():
+                item.setData_forType_(data, ptype)
+            new_items.append(item)
+        pb.writeObjects_(new_items)
 
 
 def _cmd_v() -> None: