Url

local z = {}  function z.toLink(url, text) --if true then return 'url: ' .. (url or '') .. ' text: ' .. (text or '') end     if not url or         url:match('^%s*$') then return elseif url:find('%[') or  url:match('^{{{.*}}}$') then  -- For example, a template parameter, {{{web page|}}} return url elseif z.isValid(url) then fixedUrl = url else fixedUrl = 'http://' .. url end  if text then     return '[' .. fixedUrl .. ' ' .. text .. ']' else      fixedText = fixedUrl:match('^http://(.+)') or                   fixedUrl:match('^https://(.+)') or                  fixedUrl  -- Delete the / at the end fixedText = fixedText:match('(.+)/$') or fixedText  return '[' .. fixedUrl .. ' ' .. fixedText .. ']' end end  function z.url(frame) if not frame or not frame.args then return end  return z.toLink(frame.args[1], frame.args[2]) end  --function z.plainLink -- View the Plain link template --return --end  -- See the checkurl function of the Citation/CS1 module. function z.isValid(url) return url:sub(1,2) == "//" or url:match( "^[^/]*:" ) end  return z