My little Hammerspoon script for Zoom

zoom_ptt.lua

-----------
-- Zoom PTT in Hammerspoon
-----------

function withZoomApp(fun)
  local app = hs.application.get("zoom.us")
  if (app ~= nil) then
    fun(app)
  end
end

function pttDown()
  withZoomApp(function(app)
    hs.eventtap.event.newKeyEvent("space", true):post(app)
  end)
end

function pttUp()
  withZoomApp(function(app)
    hs.eventtap.event.newKeyEvent("space", false):post(app)
  end)
end

function disconnect()
  withZoomApp(function(app)
    return app:selectMenuItem({"zoom.us", "Quit Zoom"})
  end)
end

-- Let's use right-shift as a Zoom PTT key.
-- Can't use hotkey.bind to just watch modifier changes, so we use eventtap directly
zoomRightShiftPttListener = hs.eventtap.new({hs.eventtap.event.types.flagsChanged}, function(event)
  if (event:getKeyCode() == hs.keycodes.map['rightshift']) then
    if (event:getFlags()['shift']) then
      pttDown()
    else
      pttUp()
    end
  end
end)
zoomRightShiftPttListener:start()

-- If you want to use a regular (i.e. non-modifier) key for Zoom PTT, it's much simpler:
-- hs.hotkey.bind('', 'padenter', pttDown, pttUp)

hs.hotkey.bind('', 'pad1', disconnect)