Lua filter documentation errors?

[ChrisD <cd34-gg-4SSc53hpTiu9TMao6EloiEEOCMrvLtNR@public.gmane.org>]

I have been playing with lua filters, and I have a few corrections to the lua-filters page in the documentation. Nothing urgent, just figured I would pass these along...

1) The example for mediabag.fetch (https://pandoc.org/lua-filters.html#mediabag-fetch) is incorrect. Fetch returns two values. The second line should read:

     local mt, contents = pandoc.mediabag.fetch(diagram_url, ".")

2) In the mediabag list example usage (https://pandoc.org/lua-filters.html#mediabag-list), the for statement is incorrect. It needs a "do", and the colon should be removed.

3) The docs on mediabag (https://pandoc.org/lua-filters.html#module-pandoc.mediabag) say that "The media bag is used when pandoc is called with the --extract-media or --standalone option."

The media bag appears to be populated only when --extract-media is used, and not if --standalone is used without --extract-media.

4) The example for replacing placeholders with metadata values (https://pandoc.org/lua-filters.html#replacing-placeholders-with-their-metadata-value) fails if the metadata includes boolean values.

For example, if your YAML includes a line such as:
     toc: true

The code will fail with the error "attempt to index a boolean value". That's because boolean values are stored in the metadata table as MetaBools, which are lua booleans, not tables, and the "v.t" will fail. I believe this code will also fail if the metadata table contained a MetaString, though I do not know how to get a MetaString into the meta table; strings seem to be represented as MetaInlines. The code should check for MetaBools and MetaStrings, or check that (type(v) == "table").






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