issue replacing placeholders with their metadata value with lua-filter

issue replacing placeholders with their metadata value with lua-filter

[jamie bowman]

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I'm using a Lua filter from the Pandoc example which replaces placeholder 
values in a document with their corresponding metadata value:

local vars = {}

function get_vars (meta)
 for k, v in pairs(meta) do
 if v.t == 'MetaInlines' then
 vars["$" .. k .. "$"] = {table.unpack(v)}
 end
 end
end

function replace (el)
 if vars[el.text] then
 return pandoc.Span(vars[el.text])
 else
 return el
 end
end

return {{Meta = get_vars}, {Str = replace}}

It is has worked OK thus far but I'm now encountering an issue when 
coverting markdown to pdf where only the first placeholder is replaced if 
there happens to be two of the same placeholders in the source document. 
Really simplified, my markdown document looks something like:

# Publishing Agreement

Between \$contributor\$ (hereinafter called the 'Author'),

And

\$publisher\$ (hereinafter called the 'Publisher')

...

Signed by or on behalf of the Author:

\$contributor\$

Signed by or on behalf of the Author:

\$publisher\$

When I run

pandoc -f markdown -t latex --metadata-file data/contributor/example.yml --
lua-filter filters/meta-vars.lua -s -o example.pdf example.md

I get a pdf where only the first two instances of 'contributor' and 
'publisher' are replaced. I have tried putting the placeholders inline, 
changing the placeholder symbol that wraps the string (using % instead of 
$), but I'm a bit out of my depth here. I was wondering if anybody could 
help.

For clarity my example.yml file looks like:


contributor: "Contributor name"
publisher: "Publisher name"


Many thanks in advance.

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Re: issue replacing placeholders with their metadata value with lua-filter

[jamie bowman]

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Apologies but I've realised this is actually an issue with using the filter 
in conjunction with the {multicol} package i.e. the placeholders are not 
replaced when they are within an inititated column block initiated. Will 
update accordingly.

On Friday, April 24, 2020 at 1:13:06 PM UTC+1, jamie bowman wrote:
>
> I'm using a Lua filter from the Pandoc example which replaces placeholder 
> values in a document with their corresponding metadata value:
>
> local vars = {}
>
> function get_vars (meta)
>  for k, v in pairs(meta) do
>  if v.t == 'MetaInlines' then
>  vars["$" .. k .. "$"] = {table.unpack(v)}
>  end
>  end
> end
>
> function replace (el)
>  if vars[el.text] then
>  return pandoc.Span(vars[el.text])
>  else
>  return el
>  end
> end
>
> return {{Meta = get_vars}, {Str = replace}}
>
> It is has worked OK thus far but I'm now encountering an issue when 
> coverting markdown to pdf where only the first placeholder is replaced if 
> there happens to be two of the same placeholders in the source document. 
> Really simplified, my markdown document looks something like:
>
> # Publishing Agreement
>
> Between \$contributor\$ (hereinafter called the 'Author'),
>
> And
>
> \$publisher\$ (hereinafter called the 'Publisher')
>
> ...
>
> Signed by or on behalf of the Author:
>
> \$contributor\$
>
> Signed by or on behalf of the Author:
>
> \$publisher\$
>
> When I run
>
> pandoc -f markdown -t latex --metadata-file data/contributor/example.yml 
> --lua-filter filters/meta-vars.lua -s -o example.pdf example.md
>
> I get a pdf where only the first two instances of 'contributor' and 
> 'publisher' are replaced. I have tried putting the placeholders inline, 
> changing the placeholder symbol that wraps the string (using % instead of 
> $), but I'm a bit out of my depth here. I was wondering if anybody could 
> help.
>
> For clarity my example.yml file looks like:
>
>
> contributor: "Contributor name"
> publisher: "Publisher name"
>
>
> Many thanks in advance.
>

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