help with lua filter "Replacing placeholders with their metadata value"

[Howard Borchew <hborchew-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Hello,

There is an example lua filter in pandoc.org called:
"Replacing placeholders with their metadata value"

This does exactly what I need but for one exception:
If I set a metadata value on the pandoc command line 
with --metadata=KEY[:VALUE]
then the placeholder is not replaced with anything and not the command line 
VALUE
using this example lua filter.

Is there an easy fix for this?

I am pasting the example from https://pandoc.org/lua-filters.html below.

Thanks,
Howard
----
local vars = {}

function get_vars (meta)
  for k, v in pairs(meta) do
    if pandoc.utils.type(v) == 'Inlines' 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}}

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