Re: Lua filters: validating input and output formats

[BPJ <bpj-J3H7GcXPSITLoDKTGw+V6w@public.gmane.org>]

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Great. Thanks!

Den tis 12 juli 2022 12:41Albert Krewinkel <albert+pandoc-9EawChwDxG8hFhg+JK9F0w@public.gmane.org>
skrev:

>
> BPJ <melroch-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>
> > I'm writing a filter which walks a table read from CSV, which are all
> > read in as literal strings by Pandoc, and parses them with pandoc.read.
> > In order to know which format to read the filter inspects a metadata
> > field expecting the value to be the one to pass as second argument to
> > pandoc.read. However there is easy way to validate that value before
> > calling pandoc.read. To be sure I could create a table mapping every
> > name returned by --list-input-formats to `true`, but it would seem that
> > rather than every filter which needs this information (and conversely
> > output formats for pandoc.write) maintaining its own lookup it would be
> > better if the Lua API provided it, either as a pair of functions
> > returning true if their argument is a valid format, or as (objects
> > which act as) tables (sets) with valid formats mapped to true, which is
> > something I assume Pandoc already has provision for internally. Does
> > this seem like a good idea, or is my use case with the filter taking
> > this info from the user too unusual to warrant this?
>
> That seems like a good idea to me. I've created a PR:
> https://github.com/jgm/pandoc/pull/8177
>
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