Global macOS hotkey for Kitty

init.lua

-- Function: Center and focus the main window of an application
function centerAndFocusMainWindow(app)
    local mainWindow = app:mainWindow()
    if mainWindow then
        mainWindow:centerOnScreen()
        mainWindow:focus()
    end
end

-- Function: Watch for a specific application launch and execute a callback when launched
function watchForAppLaunch(appName, callback)
    local watcher
    watcher = hs.application.watcher.new(function(name, event, app)
        if event == hs.application.watcher.launched and name == appName then
            callback(app)
            if watcher then
                watcher:stop()
            end
        end
    end)
    watcher:start()
end

-- Function: Set up a watcher for an application to listen for window creation and execute a callback
function appNewWindowWatcher(app, callback)
    if not app or not app:isRunning() then return end

    local watcher = app:newWatcher(function(element, event)
        if event == hs.uielement.watcher.windowCreated then
            -- Execute the provided callback function
            callback(app)
            -- Optionally stop the watcher if you no longer need to listen for new windows
            -- watcher:stop()
        end
    end)

    -- Start watching for window creation events
    watcher:start({hs.uielement.watcher.windowCreated})
end

-- Main keybinding to toggle Kitty
hs.hotkey.bind({ "ctrl" }, "\\", function()
	-- Get application and main window objects for Kitty for program logic
	app = hs.application.find("kitty", true)
	if app then
		mainWindow = app:mainWindow()
	end
	-- Logic if Kitty is running
	if app then
		if app:isFrontmost() and mainWindow then
			app:hide()
		elseif mainWindow then
			mainWindow:focus()
		else
			appNewWindowWatcher(app, function(app)
				centerAndFocusMainWindow(app)
			end)
			app:selectMenuItem({"Shell", "New OS Window"})
		end
	-- Logic if Kitty is not running
	else
		watchForAppLaunch("kitty", function(app)
			centerAndFocusMainWindow(app)
		end)
		hs.application.launchOrFocus("/Applications/kitty.app")
	end
end)

macos_hotkey_kitty_hammerspoon.md

Foo bar.