Mojave dark mode border fix. [Hammerspoon]

init.lua

global_border = nil

local function blackLine()
    local topLine = hs.drawing.rectangle(
    hs.geometry.rect(0, 20, 1280, 1)
    )
    topLine:setFillColor({hex='#40403e',["alpha"]=1})
    topLine:setFill(true)
    topLine:setLevel('floating')
    topLine:show()

end

local function blackBorder()
    window = hs.window.focusedWindow()
    if window ~= nil then
        top_left = window:topLeft()
        size = window:size()
        if global_border ~= nil then
            global_border:delete()
        end
        global_border = hs.drawing.rectangle(hs.geometry.rect(top_left['x'], top_left['y'], size['w'], size['h']))
        global_border:setStrokeColor({hex='#404040',["alpha"]=1})
        global_border:setFill(false)
        global_border:setRoundedRectRadii(3, 3)
        global_border:setStrokeWidth(2)
        global_border:setLevel('tornOffMenu')
        global_border:show()
    end
end

local function removeBorder()
    global_border:delete()
end

blackLine()
blackBorder()

allwindows = hs.window.filter.new(nil)
allwindows:subscribe(hs.window.filter.windowCreated, function () blackBorder() end)
allwindows:subscribe(hs.window.filter.windowFocused, function () blackBorder() end)
allwindows:subscribe(hs.window.filter.windowMoved, function () blackBorder() end)
allwindows:subscribe(hs.window.filter.windowUnfocused, function () removeBorder() end)