Hammerspoon module to kill `legacyScreensaver`

kill_ss.lua

screenSleep = false
screenSaver = false
screenLock = false
--[[
    place in ~/.hammerspoon/kill_screensaver/
    load from your hammerspoon init.lua:
    require "kill_screensaver.kill_ss"
    A to kill legacyScreenSaver when the screen saver exits and/or screen wakes

    legacyScreenSaver has a memory leak that causes it to consume many gigabytes of memory over
    a period of several days. killall -9 legacyScreenSaver seems to be harmless, and allows the memory to be freed

]]

local log = hs.logger.new('main','debug')

function killLegacySaver()
    log.i("killing legacyScreenSaver")
    local task = hs.task.new("/usr/bin/killall",nil, {"-9", "legacyScreenSaver"})
    task:start()
end

function updateSaverStatus()
    log.i("Doing kill_ss update")
    log.i("screenLock: ", screenLock)
    log.i("screenSaver: ", screenSaver)
    log.i("screenSleep: ", screenSleep)
    if screenSaver == false and screenLock == false and screenSleep == false then
        killLegacySaver()
    else
        log.i("Nothing to update")
    end
end

function saverMonitorCallback(event)

    if event == hs.caffeinate.watcher.screensaverDidStart then
        log.i("screensaverDidStart")
        screenSaver = true
    elseif event == hs.caffeinate.watcher.screensDidLock then
        log.i("screensDidLock")
        screenLock = true
    elseif event == hs.caffeinate.watcher.screensDidSleep then
        log.i("screensDidSleep")
        screenSleep = true
    elseif event == hs.caffeinate.watcher.screensaverDidStop then
        log.i("screensaverDidStop")
        screenSaver = false
    elseif event == hs.caffeinate.watcher.screensDidUnlock then
        log.i("screensDidUnlock")
        screenLock = false
    elseif hs.caffeinate.watcher.screensDidWake then
        log.i("screensDidWake")
        screenSleep = false
    end

    updateSaverStatus()
end

saverWatcher = hs.caffeinate.watcher.new(saverMonitorCallback)
saverWatcher:start()
updateSaverStatus()