Hi. I'm new to Pandoc & Lua but my present issue is straightforward. I am
converting a Markdown file to HTML with pandoc like this:

pandoc -L filter.lua -f gfm -t html -o file.html file.md

Where file.md contains a line with this MD comment (the MD file was
obtained by converting from RST where I had to seed that file with an RST
comment to use as a placeholder for what I'm doing here):

<!-- blah -->

I simply want to convert this into an actual (second-level) MD header:

## blah

From what I've read, I would ideally specify an "element" that will be
acted upon, but what is a comment considered? Anyway, I think I can specify
`Pandoc` to mean "check the entire document", and that's what I've done
here (I will eventually be iterating through multiple MD files so I should
really not be doing it like this; please advise!):

function Pandoc (value)
  comment = "<!-- blah -->"
  comment = comment:gsub("%<%!%-%- blah %-%-%>", "## blah")
  return value
end

I've run the main logic through Lua on the terminal and it works:

$ lua
Lua 5.3.3  Copyright (C) 1994-2016 Lua.org, PUC-Rio
> comment = "<!-- blah -->"
> comment = comment:gsub("%<%!%-%- blah %-%-%>", "## blah")
> print (comment)
## blah

But I'm failing to integrate it with Pandoc (no change is registered in
file.html). It's probably due to my misunderstanding of functions (not a
programmer!).

TIA.

/pm

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