Block macOS menubar while in fullscreen (hammerspoon)

init.lua

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-- 🚫 Block macOS menubar reveal in fullscreen by redirecting mouse
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local BLOCK_HEIGHT = 5         -- pixels from top edge
local blockMenubar = true
local checkInterval = 0.02     -- seconds (~50 Hz)

local function blockMenu()
  if not blockMenubar then return end

  local pos = hs.mouse.getAbsolutePosition()
  local screen = hs.mouse.getCurrentScreen()
  local frame = screen:fullFrame()

  -- If mouse reaches top edge
  if pos.y <= (frame.y + BLOCK_HEIGHT) then
    local newY = frame.y + BLOCK_HEIGHT + 2
    hs.mouse.setAbsolutePosition({ x = pos.x, y = newY })
    -- Optional visual indicator
    -- hs.alert.closeAll(); hs.alert("Menubar blocked", 0.3)
  end
end

-- Run repeatedly
if _G.menubarBlockTimer then _G.menubarBlockTimer:stop() end
_G.menubarBlockTimer = hs.timer.doEvery(checkInterval, blockMenu)

-- Toggle hotkey
hs.hotkey.bind({ "ctrl", "alt", "cmd" }, "M", function()
  blockMenubar = not blockMenubar
  hs.alert.show("Menubar Block: " .. (blockMenubar and "ON" or "OFF"))
end)

hs.alert.show("Menubar Block loaded ✅")