Apply filter to beamer blocks

Apply filter to beamer blocks

[Bruno Grenet]

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Dear all,

My question is a rewrite of a previous question of mine 
(https://groups.google.com/g/pandoc-discuss/c/wg3UIgI7G8I/m/V8GoGf9ACwAJ), 
with less convoluted explanation. 

For conversion from markdown to beamer, is there a(n easy...) way to define 
a lua filter that applies to headers that will become beamer blocks?

The goal is to be able for instance to add classes and attributes to the 
header becoming beamer blocks to control the display. A few examples 
include things like "width = XX%", or ".centered" for the inside text to be 
centered, etc. Of course, there are other ways to achieve such results, but 
the source file become kind of ugly. 

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Re: Apply filter to beamer blocks

[Bastien DUMONT]

If you set the --slide-level option on the command line, you will be able to match the headers that are below this level, i.e. those that will be rendered as block headings. Example below:

```
BLOCK_LEVEL = PANDOC_WRITER_OPTIONS.slide_level - 1

function Header(header)
  if header.level >= BLOCK_LEVEL then
    print('**********\nIt works!\n**********\n')
  end
end
```


Le Friday 10 March 2023 à 02:24:31AM, Bruno Grenet a écrit :
> Dear all,
> 
> My question is a rewrite of a previous question of mine (https://
> groups.google.com/g/pandoc-discuss/c/wg3UIgI7G8I/m/V8GoGf9ACwAJ), with less
> convoluted explanation.
> 
> For conversion from markdown to beamer, is there a(n easy...) way to define a
> lua filter that applies to headers that will become beamer blocks?
> 
> The goal is to be able for instance to add classes and attributes to the header
> becoming beamer blocks to control the display. A few examples include things
> like "width = XX%", or ".centered" for the inside text to be centered, etc. Of
> course, there are other ways to achieve such results, but the source file
> become kind of ugly.
> 
> 
> --
> You received this message because you are subscribed to the Google Groups
> "pandoc-discuss" group.
> To unsubscribe from this group and stop receiving emails from it, send an email
> to [1]pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
> To view this discussion on the web visit [2]https://groups.google.com/d/msgid/
> pandoc-discuss/e9bfa616-059a-4df7-9d92-d462ea6f3ed0n%40googlegroups.com.
> 
> References:
> 
> [1] mailto:pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
> [2] https://groups.google.com/d/msgid/pandoc-discuss/e9bfa616-059a-4df7-9d92-d462ea6f3ed0n%40googlegroups.com?utm_medium=email&utm_source=footer

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Re: Apply filter to beamer blocks

[bruno.grenet-Re5JQEeQqe8AvxtiuMwx3w]

Thanks for your reply. Ideally, I'd like something which is not based on the command line options, but that's already a working solution.

Best,
Bruno

On 10/03/2023 12:00, Bastien DUMONT <bastien.dumont-VwIFZPTo/vqsTnJN9+BGXg@public.gmane.org> wrote:
> If you set the --slide-level option on the command line, you will be able to match the headers that are below this level, i.e. those that will be rendered as block headings. Example below:
> 
> ```
> BLOCK_LEVEL = PANDOC_WRITER_OPTIONS.slide_level - 1
> 
> function Header(header)
>    if header.level >= BLOCK_LEVEL then
>      print('**********\nIt works!\n**********\n')
>    end
> end
> ```
> 
> 
> Le Friday 10 March 2023 à 02:24:31AM, Bruno Grenet a écrit :
> > Dear all,
> >
> > My question is a rewrite of a previous question of mine (https://
> > groups.google.com/g/pandoc-discuss/c/wg3UIgI7G8I/m/V8GoGf9ACwAJ), with less
> > convoluted explanation.
> >
> > For conversion from markdown to beamer, is there a(n easy...) way to define a
> > lua filter that applies to headers that will become beamer blocks?
> >
> > The goal is to be able for instance to add classes and attributes to the header
> > becoming beamer blocks to control the display. A few examples include things
> > like "width = XX%", or ".centered" for the inside text to be centered, etc. Of
> > course, there are other ways to achieve such results, but the source file
> > become kind of ugly.
> >
> >
> > --
> > You received this message because you are subscribed to the Google Groups
> > "pandoc-discuss" group.
> > To unsubscribe from this group and stop receiving emails from it, send an email
> > to [1]pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
> > To view this discussion on the web visit [2]https://groups.google.com/d/msgid/
> > pandoc-discuss/e9bfa616-059a-4df7-9d92-d462ea6f3ed0n%40googlegroups.com.
> >
> > References:
> >
> > [1] mailto:pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
> > [2] https://groups.google.com/d/msgid/pandoc-discuss/e9bfa616-059a-4df7-9d92-d462ea6f3ed0n%40googlegroups.com?utm_medium=email&utm_source=footer
> 
> 

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Re: Apply filter to beamer blocks

[Albert Krewinkel]

bruno.grenet-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org writes:

> Thanks for your reply. Ideally, I'd like something which is not based on the
> command line options, but that's already a working solution.

We've added a `pandoc.structure.slide_level` Lua function in a recent
release, Bastien's elegant solution can be made to work even when pandoc
auto-detects the slide level:

    function Pandoc (doc)
      local SLIDE_LEVEL =
        PANDOC_WRITER_OPTIONS.slide_level or
        pandoc.structure.slide_level(doc)
      return doc:walk {
        Header = function (header)
          if header.level == SLIDE_LEVEL then
            print(pandoc.utils.stringify(header))
          end
        end
      }
    end



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

Re: Apply filter to beamer blocks

[bruno.grenet-Re5JQEeQqe8AvxtiuMwx3w]

Oh, that's great! Thanks!

On 13/03/2023 14:01, Albert Krewinkel <albert+pandoc-9EawChwDxG8hFhg+JK9F0w@public.gmane.org> wrote:
> 
> bruno.grenet-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org writes:
> 
> > Thanks for your reply. Ideally, I'd like something which is not based on the
> > command line options, but that's already a working solution.
> 
> We've added a `pandoc.structure.slide_level` Lua function in a recent
> release, Bastien's elegant solution can be made to work even when pandoc
> auto-detects the slide level:
> 
>      function Pandoc (doc)
>        local SLIDE_LEVEL =
>          PANDOC_WRITER_OPTIONS.slide_level or
>          pandoc.structure.slide_level(doc)
>        return doc:walk {
>          Header = function (header)
>            if header.level == SLIDE_LEVEL then
>              print(pandoc.utils.stringify(header))
>            end
>          end
>        }
>      end
> 
> 
> 
>