Is it possible in some way to pass a file path as argument to pandoc.read()
in Lua filters or do you have to first get a string using Lua's io.open()
and file:read()? If no would it maybe be a good idea to allow passing a
table `{ file = 'path/to/file'}` instead of a string to read from a file?
This is assuming that the problems I am having opening files with Lua from
inside filters (I think the files are not found) may not be present from
Haskell.

Also is there some way to read a YAML file into a (meta)data structure
without manually making sure that the string starts/ends with
`---\n`/`\n...\n`? Using `yaml = yaml:gsub('^%s*%-%-%-%%s*', ''):gsub('^',
'---\n')` and its EOS counterpart is a rather blunt method.

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