Hammerspoon script that creates a new Space/virtual desktop and sticks a new Chrome window into it with ⌘⌃⌥N

init.lua

-- Grab the ID for the last desktop, which is assumed to be the most recently create one
function getLargestDesktopKey()
	rawSpaceNames = hs.spaces.missionControlSpaceNames()
	for key, value in pairs(rawSpaceNames) do
	  uuid = key
	end
	spaceNames = rawSpaceNames[uuid]
	for _, nested_table in pairs(rawSpaceNames) do
	  for __, value in pairs(nested_table) do
		local desktopNum = string.match(value, "Desktop (%d+)")
		if desktopNum ~= nil then
		  desktopNum = tonumber(desktopNum)
		  if largestDesktop == nil or desktopNum > largestDesktop then
			largestDesktop = desktopNum
		  end
		end
	  end
	end
	desktop = string.format("Desktop %d", largestDesktop)
	desktopKey = nil
	for key, value in pairs(spaceNames) do
	  if value == desktop then
		return key
	  end
	end
  return nil
end

-- return true if a new chrome window was found. New chrome windows are assumed to start
-- with a title of ' - Google Chrome - '. Windows of pages with not title presumable also
-- start that way though.
function foundNewChromeWin()
  tableOfChromeWindows = hs.fnutils.filter(hs.window.visibleWindows(), function(win)
	  return win:application():name() == "Google Chrome" and not win:isMinimized()
  end)
  for key, value in pairs(tableOfChromeWindows) do
	print(key, value)
	if string.starts(value:title(), " - Google Chrome - ") then
		return true
	end
  end
  return false
end

-- https://stackoverflow.com/questions/22831701/lua-read-beginning-of-a-string
-- string.match(String, "^Start") ~= nil should also work but does not for some reason,
-- despite working in the console.
function string.starts(String,Start)
	if string.len(String) == 0 then
		return false
	end
	return string.sub(String, 1, string.len(Start)) == Start
end

-- Create a new space and stick a fresh Chrome window in it
-- Define a hotkey to trigger the script
hs.hotkey.bind({"cmd", "ctrl", "alt"}, "N", function()
  -- Create a new Chrome window and wait for it to be created
  hs.application.launchOrFocus("Google Chrome")
  hs.timer.waitUntil(function()
    return hs.application.frontmostApplication():name() == "Google Chrome"
  end, function()
    hs.eventtap.keyStroke({"cmd"}, "n", 0) -- Press cmd+n to create a new window
	hs.timer.waitUntil(foundNewChromeWin, function()
	  newChromeWindow = hs.fnutils.find(hs.window.visibleWindows(), function(win)
		return string.starts(win:title(), " - Google Chrome -") and
		win:application():name() == "Google Chrome" and not win:isMinimized()
	  end, .1)
	  print("newChromeWindow found:", newChromeWindow)
	  -- Add new space, find its key
	  hs.spaces.addSpaceToScreen(true)
	  largestDesktopKey = getLargestDesktopKey()
	  print("largestDesktopKey ", largestDesktopKey)
	  if largestDesktopKey ~= nil then
		-- Finally, move the window to the last desktop and focus that desktop
		hs.spaces.moveWindowToSpace(newChromeWindow, largestDesktopKey, true)
		hs.spaces.gotoSpace(largestDesktopKey)
	  end
	end, .1)
  end, .1)
end)