I think I mentioned this recently but a useful trick when using a filter to
convert most code spans/blocks into raws or something else is to use a
dummy class `.code` on those which don't have any other class(es) and
shouldn't be converted:

``````lua
local function no_code_class (it) return it ~= 'code' end

function Code (elem)
  -- Skip if it has any classes
  if 0 < #elem.classes then
    -- Remove the 'code' class
    elem.classes = elem.classes:filter(no_code_class)
    return elem
  else
    -- Do whatever you want with a "bare" Code e.g.
    return pandoc.RawInline(SOME_FORMAT, elem.text)
  end
end
``````


Den ons 29 dec. 2021 21:46bapt auguie <auguieba-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> skrev:

> Excellent, I managed to adapt it and it works a charm!
>
> Thanks,
>
> b.
>
> On Wed, 29 Dec 2021 at 20:42, John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org> wrote:
>
>> bapt auguie <auguieba-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>>
>> > I would like to walk the AST, and immediately after headers with a
>> specific
>> > attribute, inject a \renewcommand{} based on the header's attributes,
>> such
>> > as (dummy example),
>> >
>> > \renewcommand\subsection[1]{\textbf{#1}}
>>
>> This is pretty easy.  You would have a function
>>
>> function Header(el)
>>   local attr = el.attributes
>>   -- you can do attr['foo'] to get the value of the 'foo' attribute
>>   -- now create a string with the macro:
>>   local macro = ...
>>   return { el, pandoc.RawBlock("latex", macro) }
>> end
>>
>> You can fill in the blanks.
>>
>> --
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