hammerspoon config

.hammerspoon/Spoons/darkmode.lua

@@ -0,0 +1,92 @@
+-- --------------------------------------------------------------------------
+--
+-- Implementation of a dark mode library for detecting and setting dark
+-- mode in MacOS.
+--
+-- --------------------------------------------------------------------------
+--
+-- Example:
+--
+-- dm = require "darkmode"
+-- dm.addHandler(function(dm2) print('darkmode changed:',dm2) end)
+-- print('darkmode:',dm.getDarkMode())
+-- dm.setDarkMode(not dm.getDarkMode())
+-- print('darkmode:',dm.getDarkMode())
+-- dm.setDarkMode(not dm.getDarkMode())
+--
+-- --------------------------------------------------------------------------
+
+-- --------------------------------------------------------------------------
+-- internal Data which should not be garbage collected
+-- --------------------------------------------------------------------------
+
+local internalData = {
+	darkmode = false,
+	watcher = nil,
+	handler = {}
+}
+
+-- --------------------------------------------------------------------------
+-- General functions
+-- --------------------------------------------------------------------------
+
+local function getDarkModeFromSystem()
+	-- local _, darkmode = hs.osascript.applescript('tell application "System Events"\nreturn dark mode of appearance preferences\nend tell')
+	local _, darkmode = hs.osascript.javascript("Application('System Events').appearancePreferences.darkMode.get()")
+    return darkmode
+end
+
+local function getDarkMode()
+	return internalData.darkmode
+end
+
+local function setDarkMode(state)
+	hs.osascript.javascript(string.format("Application('System Events').appearancePreferences.darkMode.set(%s)",state))
+end
+
+local function addHandler(fn)
+	-- add it here...
+	internalData.handler[#internalData.handler+1] = fn
+end
+
+-- --------------------------------------------------------------------------
+-- Internal functions
+-- --------------------------------------------------------------------------
+
+local function initialize()
+	internalData.darkmode = getDarkModeFromSystem()
+end
+
+local function initializeWatcher()
+	-- exit if already watching
+	if internalData.watcher ~= nil then return end
+
+	internalData.watcher = hs.distributednotifications.new(function(name, object, userInfo)
+		local hasDarkMode = getDarkModeFromSystem()
+		if hasDarkMode ~= internalData.darkmode then
+			internalData.darkmode = hasDarkMode
+			-- execute each handler with the darkmode as parameter (may change in future)
+			for index, fn in ipairs(internalData.handler) do
+				fn(hasDarkMode)
+			end
+		end
+	end,'AppleInterfaceThemeChangedNotification')
+
+	internalData.watcher:start()
+end
+
+-- --------------------------------------------------------------------------
+-- Initialization
+-- --------------------------------------------------------------------------
+
+initialize()
+initializeWatcher()
+
+local module = {
+	_ = internalData,
+	setDarkMode = setDarkMode,
+	getDarkMode = getDarkMode,
+	addHandler = addHandler
+}
+
+return module