Hammerspoon switch audio output devices

switch-audio-device.lua

local function switchToDevice(deviceUid, alertIcon, alertMessage)
  local log = hs.logger.new("switchToDevice", "debug")
  local device = hs.fnutils.find(hs.audiodevice.allOutputDevices(), function(_device)
    local uid = _device:uid()
    local name = _device:name()
    if uid and name then
      return string.match(uid, deviceUid)
    else
      return false
    end
  end)

  if not device then
    hs.alert.closeAll()
    hs.alert.show(alertIcon .. " " .. deviceUid .. " not found")
    return
  end

  local success, errMsg = pcall(function() device:setDefaultOutputDevice() end)
  
  if success then
    for _,screen in ipairs(hs.screen.allScreens()) do
      hs.alert.show(alertIcon .. " " .. alertMessage, {
        textSize = 100,
        strokeColor = { white = 0, alpha = 0 },
      }, screen)
    end
  else
    hs.alert.closeAll()
    hs.alert.show("Error setting " .. device:name() .. " as default device: " .. errMsg)
  end
end

-- Bind F12 without any modifiers to switch to the G635 Gaming Headset
hs.hotkey.bind({}, "F12", function()
  hs.alert.closeAll()
  switchToDevice("G635 Gaming Headset", "🎧", "Headphones")
end)

-- Bind F13 to switch to the built-in speaker device
hs.hotkey.bind({}, "F13", function()
  hs.alert.closeAll()
  switchToDevice("BuiltInSpeakerDevice", "🔊", "Speakers")
end)