Re: help filtering links

[Albert Krewinkel <albert+pandoc-9EawChwDxG8hFhg+JK9F0w@public.gmane.org>]

Pablo Rodríguez <oinos-S0/GAf8tV78@public.gmane.org> writes:

> On 3/13/23 14:13, Albert Krewinkel wrote:
>> Pablo Rodríguez <oinos-S0/GAf8tV78@public.gmane.org> writes:
>>> [...]
>>> The first one would be an internal section link, the second one would be
>>> an autogenerated link.
>>>
>>> I think that a Lua filter could help to add a "section-link" class to
>>> the first kind of link and an "auto-link" class to the second kind of link.
>>
>> See the filter below. It adds a `section-link` class for the first kind.
>> Pandoc already adds a `uri` class for the second type, so those are not
>> touched by the filter.
>
> Many thanks for your reply, Albert.
>
> The 'uri' class is added only when reading from Markdown, but not from
> CommonMark with or without extensions (according to
> https://try.pandoc.org/).
>
> Or what am I missing here?

You're right of course, I forgot that CommonMark behaves differently.
Typically, only autolinks have a link text that's the same as the link,
so we can check for that:

    local function add_classes (link)
      local id = link.target:match '^%#(.*)'
      if id and headers[id] then
        link.classes:insert 'section-link'
      elseif link.target == pandoc.utils.stringify(link.content) then
        link.classes:insert 'auto-link'
      end
      return link
    end


-- 
Albert Krewinkel
GPG: 8eed e3e2 e8c5 6f18 81fe  e836 388d c0b2 1f63 1124

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