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February 11, 2026 09:32
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Highlight macOS active windows using Hammerspoon init.lua
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| local highlight = nil | |
| local function highlightWindow() | |
| -- Clear any existing highlight | |
| if highlight then | |
| highlight:delete() | |
| highlight = nil | |
| end | |
| -- Get the currently focused window | |
| local win = hs.window.focusedWindow() | |
| if not win then | |
| return | |
| end | |
| -- Get the frame of the focused window | |
| local frame = win:frame() | |
| -- Create a new rectangle that slightly expands beyond the window's bounds | |
| local borderWidth = 5 -- Width of the border | |
| local highlightFrame = hs.geometry.rect( | |
| frame.x - borderWidth, | |
| frame.y - borderWidth, | |
| frame.w + (2 * borderWidth), | |
| frame.h + (2 * borderWidth) | |
| ) | |
| -- Create the highlight rectangle | |
| highlight = hs.drawing.rectangle(highlightFrame) | |
| highlight:setStrokeColor({["red"] = 1, ["green"] = 0, ["blue"] = 0, ["alpha"] = 0.8}) | |
| highlight:setStrokeWidth(borderWidth) | |
| highlight:setFill(false) | |
| highlight:setRoundedRectRadii(10, 10) -- Optional: rounded corners | |
| highlight:bringToFront(true) -- Ensure it's visible on top of the window | |
| highlight:show() | |
| end | |
| -- Bind the function to a hotkey (e.g., Ctrl + Alt + H) | |
| -- hs.hotkey.bind({"ctrl", "alt"}, "H", highlightWindow) | |
| -- Automatically remove the highlight when the focus changes | |
| hs.window.filter.default:subscribe(hs.window.filter.windowFocused, function() | |
| highlightWindow() | |
| end) | |
| hs.window.filter.default:subscribe(hs.window.filter.windowUnfocused, function() | |
| if highlight then | |
| highlight:delete() | |
| highlight = nil | |
| end | |
| end) | |
| -- Automatically remove the highlight, and recreate it when the window is moved | |
| hs.window.filter.default:subscribe(hs.window.filter.windowMoved, function() | |
| if highlight then | |
| highlight:delete() | |
| highlight = nil | |
| end | |
| highlightWindow() | |
| end) |
Author
Great thank you, I actually have that on my local config it's just not been updated here.
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Just added this to redraw the highlight when the window is moved