switch between Google Chrome and Safari.lua

function switchBrowser()
  local current = hs.application.frontmostApplication()
  local bool,URL

  if (current:name() == "Google Chrome") then
    bool,URL = hs.osascript.applescript('tell application "Google Chrome" to get URL of active tab of window 0')
    if bool then
      if (string.match(URL,'chrome://')) then
        hs.alert('not a valid link')
      else
        hs.execute('open -a Safari "' .. URL .. '"')
      end
    else
      hs.alert('error getting URL')
    end
  elseif (current:name() == "Safari") then
    bool,URL = hs.osascript.applescript('tell application "Safari" to get URL of document of window 0')
    if bool then
      if (string.match(URL,'favorites://')) then
        hs.alert('not a valid link')
      else
        hs.execute('open -a "Google Chrome" "' .. URL .. '"')
      end
    else
      hs.alert('error getting URL')
    end
  else
    hs.alert('no focused browser')
  end

end