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

-- Put them back

meta.author = authors

-- We have modified, so return it

return meta

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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