Hammerspoon Lua script to run command when zoom meeting starts or stops

zoom-light-hammerspoon.lua

-- =========================
-- Configuration
-- =========================
local BIN = "~/.local/bin/zengge-led-ctl"
-- LED strip BLE identifier that can be found with `zengge-led-ctl scan`
local DEVICE = "x"

local COLOR_MEETING = "red"
local COLOR_IDLE    = "green"

local function runCmd(cmd, param)
    return hs.execute(BIN .. " " .. cmd .. " " .. DEVICE .. " " .. param, true)
end

local function setPower(power)
    return runCmd("power", power)
end

local function setColor(color)
    return runCmd("color", color)
end

-- Create a window filter that only watches zoom.us windows
local wf = hs.window.filter.new(false) -- start with no windows
    :setAppFilter("zoom.us", {allowTitles="Zoom Meeting"}) -- only Zoom with title

-- Function to call on creation
local function onCreated(win, appName, event)
    print("Zoom Meeting window created!")
    print(setColor(COLOR_MEETING))
end

-- Function to call on destruction
local function onDestroyed(win, appName, event)
    print("Zoom Meeting window destroyed!")
    print(setPower("0"))
end

-- Subscribe to the events
wf:subscribe(
    hs.window.filter.windowCreated, onCreated
):subscribe(
    hs.window.filter.windowDestroyed, onDestroyed
)