[Hammerspoon] tackboll scroll & reload with simultaneously (left & right) click

init.lua

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-- HANDLE SCROLLING & RELOAD
--------------------------------------------------------------
-- ref. https://github.com/tekezo/Karabiner/issues/814#issuecomment-337643019

local shouldFireOriginalRightMouseDown = false
local leftDowned = false
local rightDowned = false

overrideLeftMouseDown = hs.eventtap.new({ hs.eventtap.event.types.leftMouseDown }, function(e)
    leftDowned = true
    if (rightDowned) then
        hs.eventtap.keyStroke({"cmd"}, "r")
        shouldFireOriginalRightMouseDown = false
        leftDowned = false
        rightDowned = false
        return true
    else
        return false
    end
end)

overrideLeftMouseUp = hs.eventtap.new({ hs.eventtap.event.types.leftMouseUp }, function(e)
    leftDowned = false
end)

overrideRightMouseDown = hs.eventtap.new({ hs.eventtap.event.types.rightMouseDown }, function(e)
    rightDowned = true
    if (leftDowned) then
        hs.eventtap.keyStroke({"cmd"}, "r")
        shouldFireOriginalRightMouseDown = false
        leftDowned = false
        rightDowned = false
    else
        shouldFireOriginalRightMouseDown = true
    end
    return true
end)

overrideRightMouseUp = hs.eventtap.new({ hs.eventtap.event.types.rightMouseUp }, function(e)
    rightDowned = false
    if (shouldFireOriginalRightMouseDown) then
        overrideLeftMouseDown:stop()
        overrideLeftMouseUp:stop()
        overrideRightMouseDown:stop()
        overrideRightMouseUp:stop()
        hs.eventtap.rightClick(e:location())
        overrideLeftMouseDown:start()
        overrideLeftMouseUp:start()
        overrideRightMouseDown:start()
        overrideRightMouseUp:start()
        return true
    end

    return false
end)

local oldmousepos = {}
local scrollmult = -4   -- negative multiplier makes mouse work like traditional scrollwheel
dragRightToScroll = hs.eventtap.new({ hs.eventtap.event.types.rightMouseDragged }, function(e)
    -- print("scroll");

    shouldFireOriginalRightMouseDown = false

    oldmousepos = hs.mouse.absolutePosition()

    local dx = e:getProperty(hs.eventtap.event.properties['mouseEventDeltaX'])
    local dy = e:getProperty(hs.eventtap.event.properties['mouseEventDeltaY'])
    local scroll = hs.eventtap.event.newScrollEvent({dx * scrollmult, dy * scrollmult},{},'pixel')

    -- put the mouse back
    hs.mouse.absolutePosition(oldmousepos)

    return true, {scroll}
end)

overrideRightMouseDown:start()
overrideRightMouseUp:start()
overrideLeftMouseDown:start()
overrideLeftMouseUp:start()
dragRightToScroll:start()