This is using the new pandoc 3.0 feature which allows pandoc to be used as a Lua interpreter.  So just save the file as rosetta.lua and then;

pandoc lua rosetta.lua


> On Jan 24, 2023, at 1:17 PM, 'rufus42' via pandoc-discuss <pandoc-discuss@googlegroups.com> wrote:
> 
> Hello fiddlosopher,
> 
> Thank you very much for sharing your script.
> I would like to use it, but unfortunately I don't know how.
> Do I use the script like a Lua filter?
> 
> Please be so kind and give me a hint how I can use your script.
> 
> Thank you for your time and best regards
> 
> fiddlosopher schrieb am Samstag, 21. Januar 2023 um 20:05:46 UTC+1:
> -- This Lua script, when run using `pandoc lua`, will create an HTML 
> -- file rosetta.html that compares how the same content is represented 
> -- in all the text markup languages pandoc supports: 
> 
> local inp = [[ 
> # Heading 
> 
> ## level 2 
> 
> ### level 3 
> 
> #### level 4 with attributes {.blue #foobar} 
> 
> - Unordered 
> - list 
> 
> 1. ordered 
> 2. list 
> 
> a) Lettered list 
> 
> with continuation paragraph 
> 
> > Block quote 
> 
> ``` {.lua} 
> local formats = pandoc.writers 
> for format,_ in formats do 
> print(format) 
> end 
> ``` 
> 
> *emphasized text **with strong emphasis*** 
> 
> `verbatim text` and a [link with `verbatim`](http://example.com <http://example.com/>) 
> ]] 
> local doc = pandoc.read(inp, "markdown") 
> 
> local formats = pandoc.writers 
> -- remove binary formats: 
> formats.docx = nil 
> formats.pptx = nil 
> formats.odt = nil 
> formats.epub2 = nil 
> formats.epub3 = nil 
> formats.epub = nil 
> formats.chunkedhtml = nil 
> formats.biblatex = nil 
> formats.bibtex = nil 
> formats.csljson = nil 
> 
> local blocks = {} 
> 
> -- Table of code languages to use for highlighting, when it differs 
> -- from the format name: 
> local langs = { 
> icml = "xml", 
> jira = "xml", 
> fb2 = "xml", 
> docbook = "xml", 
> docbook4 = "xml", 
> docbook5 = "xml", 
> commonmark = "markdown", 
> commonmark_x = "markdown", 
> context = "latex", 
> dzslides = "html5", 
> slideous = "html", 
> slidy = "html", 
> man = "troff", 
> ms = "troff", 
> gfm = "markdown", 
> markdown_mmd = "multimarkdown", 
> markdown_github = "markdown", 
> revealjs = "html", 
> beamer = "latex", 
> ipynb = "json", 
> opendocument = "xml", 
> native = "haskell", 
> html5 = "html", 
> html4 = "html", 
> } 
> 
> local sorted_formats = {} 
> for format,_ in pairs(formats) do 
> table.insert(sorted_formats, format) 
> end 
> table.sort(sorted_formats) 
> 
> -- construct document part for each format 
> for _,format in ipairs(sorted_formats) do 
> table.insert(blocks, pandoc.Header(2, format)) 
> local lang = langs[format] or format 
> table.insert(blocks, 
> pandoc.CodeBlock(pandoc.write(doc, format), {class = lang})) 
> end 
> 
> local template = pandoc.template.compile(pandoc.template.default("html5")) 
> local html = pandoc.write(pandoc.Pandoc(blocks, 
> {title = "Markup Rosetta Stone"}), 
> "html5", 
> { template = template }) 
> 
> io.open("rosetta.html", "w"):write(html) 
> print("Created rosetta.html") 
> 
> 
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