LUA module to automatically create example of a template in MediaWiki

TemplateExample.lua

local p = {} --p stands for package

function p.TemplateExample(frame)
    local SubPageName
    local SubPageTitle
    local Title
    local Content
    local pre = mw.html.create('pre')
    local DoubleLF = string.char(10) .. string.char(10)

    if not frame.args[1] then
        SubPageName='Example'
    else
        SubPageName=frame.args[1]
    end

    Title =  mw.title.getCurrentTitle()
    SubPageTitle = mw.title.makeTitle(Title.namespace, Title.text .. '/' .. SubPageName)

    local Intro = 'This example is automatically generated via LUA script from the code in the page <code>[[' .. SubPageTitle.prefixedText .. ']]</code>'
    local CodeString = 'The code'
    local ReturnString = 'renders as'
    
    Content = SubPageTitle:getContent()
    
    if not Content then
      return "Page <code>[[" .. SubPageTitle.prefixedText .. "]]</code> does not exist: it is not possible to extract any text to generate example with"
    else
      pre
        :css( 'width', '65%' )
        :wikitext(mw.text.nowiki(SubPageTitle:getContent()))
      return  Intro .. DoubleLF .. CodeString .. DoubleLF .. tostring(pre) .. DoubleLF  .. ReturnString .. DoubleLF .. frame:expandTemplate{ title = SubPageTitle }
    end
end

return p