protplug midi script: "note tie", delay note offs till next note on event

noteoff2.lua

require "include/protoplug"

lastoff = 0

function plugin.processBlock(samples, smax, midiBuf)
    playEvents = {}
    for ev in midiBuf:eachEvent() do
        if ev:isNoteOn() and ev:getNote() ~= lastoff and lastoff>0 then
            table.insert(playEvents, midi.Event(ev))
            table.insert(playEvents, midi.Event.noteOff(
			1,
			lastoff))
			if ev:getVel() == 1 then
			    lastoff = tonumber(ev:getNote())
			else
			    lastoff = 0
            end
        elseif ev:isNoteOn() and ev:getVel() == 1 then
            lastoff = tonumber(ev:getNote())
            table.insert(playEvents, midi.Event(ev))
        elseif ev:isNoteOff() and ev:getNote() == lastoff then
        else
            table.insert(playEvents, midi.Event(ev))
        end
    end
    midiBuf:clear()
    for _,ev in ipairs(playEvents) do
        if ev:isNoteOn() then
            ev:setVel(127)
        end
        midiBuf:addEvent(ev)
    end
end