Re: Inserting attributes into elements

["'William Lupton' via pandoc-discuss" <pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>]

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This filter inserts a header before each paragraph.

-- https://pandoc.org/lua-filters.html#lua-filter-structure
function Para(para)
    return {
        -- https://pandoc.org/lua-filters.html#pandoc.header
        -- https://pandoc.org/lua-filters.html#type-attr
        pandoc.Header(2, 'Inserted header', {style='blablabla'}),
        para
    }
end

On Tue, 13 Jun 2023 at 23:00, H <agents-FcZObrvlYduBUy7/sJONFg@public.gmane.org> wrote:

> On June 13, 2023 5:38:18 PM EDT, 'William Lupton' via pandoc-discuss <
> pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> wrote:
> >sorry; i was wrong when i said that i thought that you can't add style
> >attributes (i should have checked)
> >
> >of course the style attributes _are_ CSS, but i guess that this is ok
> >for
> >you
> >
> >what do you mean by 'rewriting' a tag?
> >
> >On Tue, 13 Jun 2023 at 22:27, Bastien DUMONT
> ><bastien.dumont-VwIFZPTo/vqsTnJN9+BGXg@public.gmane.org>
> >wrote:
> >
> >> You call “insert” as if it were a method of “attr”, but attr is a
> >> key-value table. The correct way to add an attribute is:
> >>
> >> if (el.level == 2) then
> >>   local attr = el.attributes
> >>   attr.style = 'color: #112233;'
> >> end
> >>
> >>
> >> Le Tuesday 13 June 2023 à 05:19:14PM, H a écrit :
> >> > On June 13, 2023 5:16:32 PM EDT, H <agents-FcZObrvlYduBUy7/sJONFg@public.gmane.org> wrote:
> >> >
> >> >     On June 13, 2023 5:00:19 PM EDT, 'William Lupton' via
> >pandoc-discuss
> >> >     <pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> wrote:
> >> >
> >> >         As far as I know, you can't add 'style' attributes. But you
> >can
> >> embed
> >> >         CSS via header-includes. You'll find an example of this if
> >you
> >> search
> >> >         the manual for 'header-includes' (and you can use a filter
> >to
> >> set the
> >> >         variable; I think Albert gave an example of how to do this
> >a few
> >> weeks
> >> >         ago).
> >> >
> >> >         On Tue, 13 Jun 2023, 21:37 H, <[1]agents-FcZObrvlYduBUy7/sJONFg@public.gmane.org>
> >wrote:
> >> >
> >> >             Continuing my quest to write a custom filter, I now ran
> >into
> >> a need
> >> >             to add attributes to different types of tags as
> >exemplified
> >> below:
> >> >
> >> >             - In header tags such as <h2>, I need to add
> >"style=color:
> >> #112233;
> >> >             " so it becomes <h2 style="color: #112233;">.
> >> >
> >> >             - I analogously also need to add style information to
> >> <image> tags.
> >> >
> >> >             In my filter I tried:
> >> >
> >> >             style_h2 =
> >> >
> >> >             if (el.level == 2) then
> >> >                 local attr = el.attributes
> >> >                 attr.insert = style_h2
> >> >             end
> >> >
> >> >             but ended up with the below in my html output:
> >> >
> >> >             <h2
> >> >             data-insert=" style=&quot;text-transform: uppercase;
> >color: #
> >> >             cc002b;&quot;">
> >> >
> >> >             Clearly not the correct way. Can I add the style
> >information
> >> as
> >> >             above in a filter, in the pandoc function as I am going
> >> through my
> >> >             document block-by-block and modifying the document
> >structure
> >> as
> >> >             needed? I already adding <div> with various style
> >> information as I
> >> >             iterate over the blocks and that works fine but now I
> >need to
> >> >             modify existing tags.
> >> >
> >> >             I guess I could do it similarly to below but then it
> >applies
> >> to all
> >> >             eg H2:
> >> >
> >> >             function Header(el)
> >> >                 --    remove header identifier for all levels
> >> >                 el.identifier = ''
> >> >
> >> >                 --    convert level 1 and 2 to upper case
> >> >                 if (el.level == 1) or (el.level == 2) then
> >> >                     return el:walk {
> >> >                         Str = function(el)
> >> >                             return pandoc.Str(text.upper(el.text))
> >> >                         end
> >> >                     }
> >> >                 else
> >> >                     return el
> >> >                 end
> >> >             end
> >> >
> >> >             How to do it on individual H2 in a filter?
> >> >
> >> >             Thanks.
> >> >
> >> >             --
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> >> Google
> >> >             Groups "pandoc-discuss" group.
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> >> from it,
> >> >             send an email to [2]
> >> pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
> >> >             To view this discussion on the web visit [3]https://
> >> >             groups.google.com/d/msgid/pandoc-discuss/
> >> >             76a72c07-6699-d243-ae20-64808682ec9e%40meddatainc.com.
> >> >
> >> >
> >> >     I need to stay away from css since the software the output is
> >used
> >> in does
> >> >     not allow css info to be added.
> >> >
> >> >
> >> > Can I "rewrite" a tag in the filter?
> >> >
> >> > --
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> >> > To view this discussion on the web visit [5]
> >> https://groups.google.com/d/msgid/
> >> >
> >pandoc-discuss/90C7A30F-C0FA-49D8-B0CD-6521B58113F1%40meddatainc.com.
> >> >
> >> > References:
> >> >
> >> > [1] mailto:agents-FcZObrvlYduBUy7/sJONFg@public.gmane.org
> >> > [2] mailto:pandoc-discuss%2Bunsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
> >> > [3]
> >>
> >
> https://groups.google.com/d/msgid/pandoc-discuss/76a72c07-6699-d243-ae20-64808682ec9e%40meddatainc.com
> >> > [4] mailto:pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
> >> > [5]
> >>
> >
> https://groups.google.com/d/msgid/pandoc-discuss/90C7A30F-C0FA-49D8-B0CD-6521B58113F1%40meddatainc.com?utm_medium=email&utm_source=footer
> >>
> >> --
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> >> To view this discussion on the web visit
> >>
> >
> https://groups.google.com/d/msgid/pandoc-discuss/ZIjfUqabWGUWcZz2%40localhost
> >> .
> >>
>
> I used the phrase ”rewriting a tag” to mean creating a new tag from
> scratch. I then tried pandoc.Header() which does take up to three arguments
> but I could not create something similar to <H2 style=”blablabla”;>.
>
> How do I add style attributes as above?
>
> --
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> .
>

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