Re: Lua filter to convert Markdown comment

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

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So I now have this:

function RawBlock(el)
  if el.text:match("%<%!%-%- foo %-%-%>") then
    content = "foo"
    return pandoc.Header(2, content)
  end
end

There are actually about a dozen such known Markdown comments (e.g. 'foo',
'bar').
Instead of creating multiple files I'd like to have just one that uses a
regex and capture group:

  if el.text:match("%<%!%-%- (%a+) %-%-%>") then

I'm just unsure how to refer to the capture in a conditional statement
(i.e. "if 'foo' is captured then 'content' = "foo", elsif 'bar' is captured
then 'content' = "bar").


On Thu, 14 Jan 2021 at 15:57, Peter Matulis <pmatulis-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

> 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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