macOS port: rewrite as pure-Python menu bar app#1
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April 9, 2026 14:40
- Create linkbridge/ package with version stub - Create tests/ and pytest.ini - Move Linux C + Python sources into legacy/ - Replace requirements.txt with rumps/mido/python-rtmidi/aalink - Add requirements-dev.txt for pytest
- Clock stream runs unconditionally once a port is set - Toggleable MIDI START/STOP on Link transport transitions - Gracefully drops device on send failure instead of crashing - Drift-compensated absolute-time scheduling (port from Linux clock.py) - Synchronous _tick_once() allows full TDD without real threads
…BarApp in entry point
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Summary
Replaces the Linux/ALSA implementation with a pure-Python macOS menu bar
app that forwards Ableton Link tempo to a hardware MIDI clock output.
The original C/ALSA sources are archived under
legacy/and not deleted.What's new
linkbridge/Python package — single-process menu bar app withthree threads sharing a lock-guarded
ClockState:link_monitor.py—aalinkcallback wrapper, runs an asyncio loopon a daemon thread, pushes tempo and transport into shared state
clock_engine.py— 24 ppqn MIDI clock generator withdrift-compensated absolute-time scheduling, transport sync, graceful
device-disappearance handling
app.py—rumpsmenu bar UI with device picker, Start/Stop toggle,refresh, and quit
settings.py— JSON store at~/Library/Application Support/LinkBridge/with corrupt-file recovery
midi_output.py— thinmido/python-rtmidiwrappers for CoreMIDIpytest) covering Settings, MidiOutput, andClockEngine using injected fake clocks / fake MIDI sinks; no hardware
or Link peer required.
py2apppackaging —setup.py+scripts/build_app.shproducedist/LinkBridge.app, an unsigned menu-bar-only bundle (LSUIElement,arm64 native, ~50 MB).
assets/LinkBridge.icnsplus the source PNG anda regeneration script (
scripts/build_icon.py) using Pillow + iconutil.hardware notes for Novation Circuit Tracks, and a clear explanation of
Rekordbox's one-way Link constraint and the manual workflow it
requires.
Verified end-to-end
fire correctly
~1% drift over 2 s windows (matches the original Linux Python loop)
enters SYN mode and follows the streamed tempo in real time
.applaunches from Finder, registers for local networkpermission, opens last-used MIDI device, persists settings across
launches
Test plan
Notes