Re: Lua filter to convert Markdown comment

[Peter Matulis <pmatulis-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Gratitude. This got me going.

On Thu, 14 Jan 2021 at 13:52, John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org> wrote:

>
> What you want to do is match on a RawBlock element.
> Something like
>
> function RawBlock(el)
>   if el.text:match("<!--") then
>     content = -- fill this in based on el.text
>     return pandoc.Header(2, content)
>   end
> end
>
>
> Peter Matulis <pmatulis-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>
> > 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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> .
>

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