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pandoc

Would you like to add via the command line, but feel limited because arguments to `--metadata`/`-M` are not treated as ? Here's a to solve this:

function Meta (meta)
for key, value in pairs(meta) do
if type(value) == 'string' then
meta[key] = pandoc.utils.blocks_to_inlines(
pandoc.read(value).blocks)
end
end
return meta
end

Example:

pandoc -L parse-md-in-metadata.lua \
-M title='Defend democracy *now*!' …

#pandoc
Feb 05, 2025, 05:43 PM·Public
2boosts·5favorites
Public
Omikhleia - Dragon Brumeux

@pandoc Interesting tip. It's worth nothing that "pandoc.read" takes a second optional argument, the format (default markdown), so using "djot" here for instance woudld allow metadata in #djot etc.
Subsequent question; can this be derived from the input file (or specified input format with -f) ?

Quiet public
pandoc

@omikhleia Choosing a format based on the name of the input file:

local format =
pandoc.format.from_path(
PANDOC_STATE.input_files[1] or
'placeholder.md')

Information about the input format is not retained, filters have no information about the actual parser that was used to read the input. This is intentional.

A variable could be used to gain fine-grained control, e.g.

local format = tostring(PANDOC_WRITER_OPTIONS.variables.metaformat) or 'markdown'

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