Re: Modifying metadata elements with Lua filter

[BPJ <bpj-J3H7GcXPSITLoDKTGw+V6w@public.gmane.org>]

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It is better to not hard code the number of authors:

``````lua
function Meta (meta)
  if 'docx' == FORMAT then
    if 'List' ~= pandoc.utils.type(meta.author) then
      -- hopefully Inlines
      return nil
    elseif 1 == #meta.author then -- only one
      meta.author = meta.author[1]
    else -- more than one
      -- Define once, use many times
      local sep = pandoc.Inlines(", ") -- DWIM
      -- Initialize to an empty list and use `:extend` to populate
      local authors = pandoc.Inlines({ })
      -- Loop through any number of authors
      for i, author in ipairs(meta.author) do
        if 1 == i then -- no comma for the first
          authors:extend(author)
        else -- append ", A. U. Thor"
          authors:extend(sep .. author)
        end
      end
      -- Put them back
      meta.author = authors
      -- We have modified, so return it
      return meta
    end
  end
  return nil -- nothing modified
end
``````

Den tors 15 juni 2023 17:18Stephan Boltzmann <stephan2boltzmann-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
skrev:

> Thanks a lot for your help, which enabled me to write the following short
> filter, which puts the name of all authors on the same line in 'docx'
> output, while preserving the nice default layout in 'latex' output.
> Debugging filters working on the yaml metadata provided a particular
> challenge to me:
>
> function Meta (m)
>   if FORMAT:match 'docx' then
>         authors = m.author[1] .. {pandoc.Str(', ')} .. m.author[2]
>         m.author = pandoc.MetaInlines(authors)
>   end
>   return m
> end
>
> It only handles two and not more authors, but in my case, that's fine.
> William Lupton schrieb am Mittwoch, 14. Juni 2023 um 18:55:04 UTC+2:
>
>> Your metadata has this structure (hmm... perhaps some of the Inlines are
>> really MetaInlines, in which case that's a problem with my logging module):
>>
>> (#) meta Meta {
>>   author: List[2] {
>>     [1] Inlines[3] {
>>       [1] Str "Author"
>>       [2] Space
>>       [3] Str "A"
>>     }
>>     [2] Inlines[3] {
>>       [1] Str "Author"
>>       [2] Space
>>       [3] Str "B"
>>     }
>>   }
>>   title: Inlines[1] {
>>     [1] Str "Test"
>>   }
>> }
>>
>> ... so I think you want this filter (MetaInlines isn't an attribute name,
>> and you have to count the space):
>>
>> function Meta (m)
>>     print(pandoc.utils.stringify(m.author[1][3]))
>> end
>>
>> On Wed, 14 Jun 2023 at 17:47, Stephan Boltzmann <stephan2...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
>> wrote:
>>
>>> Hello everybody out there using Pandoc,
>>>
>>> For the following short document,
>>> ---
>>> title: Test
>>> author:
>>>   - Author A
>>>   - Author B
>>> ---
>>> # Introduction
>>>
>>> I would expect the Lua filter
>>>
>>> function Meta (m)
>>>     print(pandoc.utils.stringify(m.author[1].MetaInlines[2]))
>>> end
>>>
>>> to print out "A", but it prints nothing at all.
>>>
>>> What is the conceptual misunderstanding I have here?
>>>
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>>>
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