Thanks for your help, Albert.

This filter seems to work only if <div class="show"> is not inside another 
block. Would it be possible to change it to work with all the divs in the 
document? In my example, how could I keep only <div class="inner">?

In addition to that, I'd need to exclude all other elements outside the 
divs I want to keep, even if they are not inside a div. For example, a 
<p>Paragraph</p> that is not inside any div should be excluded. Would that 
be feasible?


On Wednesday, 30 September 2020 at 16:26:27 UTC-3 John MacFarlane wrote:

>
> Good idea -- I agree, that's probably a better approach!
>
> Albert Krewinkel <albert...-9EawChwDxG8hFhg+JK9F0w@public.gmane.org> writes:
>
> > Maybe there's another way:
> >
> > 1. Collect all divs in the order that pandoc sees them.
> > 2. In second traversal, check whether we want to keep the div. If
> > so, use the div that we stored before, as it will still contain
> > all children.
> >
> > Here's the code:
> >
> > local divs = pandoc.List()
> > local div_index = 0
> >
> > function collect (d)
> > divs:insert(d)
> > end
> >
> > function filter (div)
> > div_index = div_index + 1
> > if div.classes[1] == 'show' then
> > return divs[div_index]
> > else
> > return {}
> > end
> > end
> >
> > return {
> > {Div = collect},
> > {Div = filter}
> > }
> >
> > Butch writes:
> >
> >> Thanks for the response. Yeah, I’ll either do what you suggested or use
> >> some external filters before passing the files through Pandoc.
> >>
> >>
> >> On Tuesday, 29 September 2020 at 19:42:05 UTC-3 John MacFarlane wrote:
> >>
> >>>
> >>> This is the sort of thing that is currently a bit tricky
> >>> with our filter architecture.
> >>>
> >>> One idea might be to do several passes (i.e., several filters, which
> >>> you can include in the same lua file; see the docs).
> >>>
> >>> In the first pass, you'd set a special attribute keep="false" on
> >>> all Divs.
> >>>
> >>> In the second pass, you'd match Divs with the 'show' class,
> >>> and use walk_block to set keep="true" on all Divs inside it.
> >>> You'd also set keep="true" on it.
> >>>
> >>> IN the third pass, you'd match Divs and remove them if
> >>> keep="false".
> >>>
> >>> I think something like this could work.
> >>>
> >>> Butch <idiosyncr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
> >>>
> >>> > Hello,
> >>> >
> >>> > I am trying to convert specific parts of an HTML file to Markdown. I
> >>> want
> >>> > to convert everything that’s inside a specific div (including other 
> div)
> >>> > while excluding everything else. Is that possible?
> >>> >
> >>> > Here is an example. I want to take this:
> >>> >
> >>> > <div class="show">
> >>> > <p>This is the outer text.</p>
> >>> > <div class="inner">
> >>> > <p>This is the inner text.</p>
> >>> > </div>
> >>> > </div>
> >>> > <div class="hide">
> >>> > <p>This is the hidden text.</p>
> >>> > </div>
> >>> >
> >>> > And convert it so I have this:
> >>> >
> >>> > ::: {.show}
> >>> > This is the outer text.
> >>> >
> >>> > ::: {.inner}
> >>> > This is the inner text.
> >>> > :::
> >>> > :::
> >>> >
> >>> > I.e., I want to convert everything that’s inside <div class="show">
> >>> > (including other div) and to exclude everything else in the document.
> >>> >
> >>> > If I use a filter like this:
> >>> >
> >>> > function Div(el)
> >>> > if el.classes[1] == "show" then
> >>> > return el
> >>> > else
> >>> > return {}
> >>> > end
> >>> > end
> >>> >
> >>> > The resulting Markdown will be:
> >>> >
> >>> > ::: {.show}
> >>> > This is the outer text.
> >>> > :::
> >>> >
> >>> > Which is kind of expected. So what can I do to include in the 
> conversion
> >>> > not only <div class="show">, but also all the other div inside it?
> >>> >
> >>> > The actual HTML files I want to convert are very large, so I can’t 
> list
> >>> all
> >>> > the classes I want to include (or exclude from) in the conversion.
> >>> >
> >>> > Thanks in advance.
> >>> >
> >>> >
> >>> > --
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> send
> >>> an email to pandoc-discus...-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
> >>> > To view this discussion on the web visit
> >>> 
> https://groups.google.com/d/msgid/pandoc-discuss/ee79a1ca-efb1-463c-ace9-5398c8e623e3n%40googlegroups.com
> >>> .
> >>>
> >
> >
> > --
> > Albert Krewinkel
> > GPG: 8eed e3e2 e8c5 6f18 81fe e836 388d c0b2 1f63 1124
> >
> > -- 
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> > To view this discussion on the web visit 
> https://groups.google.com/d/msgid/pandoc-discuss/87lfgrk5sb.fsf%40zeitkraut.de
> .
>

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