Re: Announcing asciidoc-hs, an AsciiDoc parser in Haskell

[John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org>]

"'Guillem Marpons' via pandoc-discuss"
> El 16/6/21 a las 17:01, John MacFarlane escribió:
>> 
>> One issue concerns includes.  The pandoc readers are
>> parameterized on any instance of PandocMonad, so they can be
>> run either "pure" or in an IO context.  PandocMonad provides
>> an abstraction for reading from the file system -- an ersatz
>> file system is used in "pure" instances.
>> 
>> So, for purposes of eventual integration in pandoc, it would be
>> great if your library was compatible with this (rather than,
>> e.g., exporting a parser that requires MonadIO).
>
> I'm more than willing to make the changes needed to integrate with 
> Pandoc-the-tool, when time arrives, and start planing for it. In fact, 
> it seems that PandocMonad implements a lot of the functionality needed 
> for AsciiDoc include/image/whatever expansion.
>
> Now, is there some example of reader implemented as external library 
> that needs access to included files? It seems to me that the easiest way 
> for a library to integrate with PandocMonad would be to put the class in 
> a different package that the library (asciidoc-hs in this case) could 
> have as a dependency. Is there another way? What I understand is that 
> readCommonMark[Body] calls to a pure parser defined in package 
> commonmark, am I right? But it's not possible for the AsciiDoc parser to 
> be pure.

One idea would be to use a custom typeclass instead of using
MonadIO.  Something a bit like PandocMonad, with a pure instance
and an IO instance.  Say you call it AsciidocMonad. Then hooking
up your library to pandoc would just be a matter of defining

    instance AsciidocMonad m => PandocMonad m

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