From: BPJ <melroch-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: pandoc-discuss <pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
Subject: Re: Lua filter to convert Markdown comment
Date: Fri, 15 Jan 2021 10:19:41 +0100 [thread overview]
Message-ID: <CADAJKhDDZXjEBCWKRBnJChN1F-i_2BctoD1WHauPLXJHTKbGKA@mail.gmail.com> (raw)
In-Reply-To: <CAMxYqzHK6BvhbzE__4__Po+wizq_4b3CZT9q=9ZQ1iF9JR-VSg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
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Almost there. You need
`content = {pandoc.Str"Foo"}`
since the content of a Header is a list of inline elements.
As for multiple possible values Lua patterns are, as you seem to have
discovered, a bit challenged in that they don't support alternations. The
best solution is to use a table:
``````lua
-- Localize `pandoc` to a shorter name to save space & type less!
local p = pandoc
-- This is your "substitution" table.
local text4match = {
-- If you need styling do this:
foo = { p.Str"Foo", p.Space(), p.Str"and", p.Space(),
p.Emph(p.Str"more.") },
-- If you do not need styling you can do this:
bar = { p.Str"Bar and less." },
}
function RawBlock (elem)
local key = elem.text:match"%<%!%-%-%s*(%a+)%s*%-%-%>"
if key then
local text = text4match[key]
if text then
return p.Header(2, text)
end
end
-- No match, no text, ignore this elem
return nil
end
``````
HTH,
/bpj
--
Better --help|less than helpless
Den fre 15 jan. 2021 04:39Peter Matulis <pmatulis-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> skrev:
> 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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>>> > To view this discussion on the web visit
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>>> .
>>>
>> --
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next prev parent reply other threads:[~2021-01-15 9:19 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-14 18:08 Peter Matulis
[not found] ` <CAMxYqzEvRHcFQ1BYsFODC-Bd36=LfO-UKcVYPNzR8i8rDZorXw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2021-01-14 18:51 ` John MacFarlane
[not found] ` <m2h7njgxme.fsf-jF64zX8BO08an7k8zZ43ob9bIa4KchGshsV+eolpW18@public.gmane.org>
2021-01-14 20:57 ` Peter Matulis
[not found] ` <CAMxYqzEn22Y4goKKW-D3Coqi5UTNR+6AgfcJAkJZPy8qtXjvjQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2021-01-15 3:38 ` Peter Matulis
[not found] ` <CAMxYqzHK6BvhbzE__4__Po+wizq_4b3CZT9q=9ZQ1iF9JR-VSg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2021-01-15 9:19 ` BPJ [this message]
[not found] ` <CADAJKhDDZXjEBCWKRBnJChN1F-i_2BctoD1WHauPLXJHTKbGKA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2021-01-15 19:14 ` Peter
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