hammerspoon-swap-displays/swap-displays.lua at main · Arro38/hammerspoon-swap-displays · GitHub

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local function swapDisplays()
    local screens = hs.screen.allScreens()
    if #screens < 2 then
        hs.alert.show("Two displays are required to swap")
        return
    end
    local screenA, screenB = screens[1], screens[2]

    local windows = hs.window.visibleWindows()
    local moves = {}

    for _, win in ipairs(windows) do
        if win:isStandard() and not win:isMinimized() then
            local winScreen = win:screen()
            local target = nil
            if winScreen:id() == screenA:id() then
                target = screenB
            elseif winScreen:id() == screenB:id() then
                target = screenA
            end

            if target then
                local src = winScreen:frame()
                local dst = target:frame()
                local f = win:frame()
                local rx = (f.x - src.x) / src.w
                local ry = (f.y - src.y) / src.h
                local rw = f.w / src.w
                local rh = f.h / src.h
                table.insert(moves, {
                    win = win,
                    frame = hs.geometry.rect(
                        dst.x + rx * dst.w,
                        dst.y + ry * dst.h,
                        rw * dst.w,
                        rh * dst.h
                    )
                })
            end
        end
    end

    hs.window.animationDuration = 0
    for _, m in ipairs(moves) do
        m.win:setFrame(m.frame)
    end

    hs.alert.show("Displays swapped (" .. #moves .. " windows)")
end

hs.hotkey.bind({"cmd", "alt"}, "S", swapDisplays)

hs.alert.show("Hammerspoon loaded")