Get some component out of a Qmd document

README

* Set `lang-out` to the language to ignore
* Use the LUA filter to remove the element mark with the language

```
quarto pandoc --to markdown -L lang-out.lua test.qmd
```

lang-out.lua

local remove

readMeta = function(meta)
  remove = pandoc.utils.stringify(meta['lang-out'])
  return meta
end


processDiv = function(el)
  if remove and el.attributes["when-lang"] == remove then
    return {}
  else
    return el.content
  end
end

processCode = function(el)
  if remove and el.classes and el.classes:includes("{"..remove .."}") then
    return {}
  end
  return el
end

return {
  {Meta = readMeta},
  {Div = processDiv, CodeBlock = processCode}
}

test.qmd

---
title: "Untitled"
format: html
lang-out: r
---

# Slide 

::: {when-lang=r}
Content
:::

``` {r}
1 + 1
````

See `{{< fa pen >}}`{=markdown}