pandoc.write helper function for Lua filters?

pandoc.write helper function for Lua filters?

[msprev]

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The pandoc.read helper function is incredibly useful in Lua filters. Is 
there any chance of adding a counterpart to expose similar functionality 
for writers, e.g. a pandoc.write function that takes as arguments a pandoc 
document and output format and yields as output a string of formatted text? 

I've wanted to write a Lua filter to extract bits of the ast and kick them 
out, for external use, as strings of html or strings of markdown. More 
generally, when writing Lua filters, it would be incredibly useful for 
diagnostic/debugging purposes to be able to print out bits of the ast to 
the terminal as a string (e.g. in native output format) to make sure the 
filter is working as expected.

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Re: pandoc.write helper function for Lua filters?

[BPJ]

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You can shell out to pandoc to do that, even though it is of course
probably slower than what a built-in function would be. The Perl Pandoc
wrapper does just that. <https://metacpan.org/pod/Pandoc> The pipe function
in Lua filters should make that fairly easy.

Den tors 14 feb. 2019 21:26 skrev msprev <msprevak-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>:

> The pandoc.read helper function is incredibly useful in Lua filters. Is
> there any chance of adding a counterpart to expose similar functionality
> for writers, e.g. a pandoc.write function that takes as arguments a pandoc
> document and output format and yields as output a string of formatted text?
>
> I've wanted to write a Lua filter to extract bits of the ast and kick them
> out, for external use, as strings of html or strings of markdown. More
> generally, when writing Lua filters, it would be incredibly useful for
> diagnostic/debugging purposes to be able to print out bits of the ast to
> the terminal as a string (e.g. in native output format) to make sure the
> filter is working as expected.
>
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Re: pandoc.write helper function for Lua filters?

[msprev]

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Shelling out would not solve this problem. In order to shell out to a pandoc executable you would need to serialise the ast into a format that it can read (markdown, html, native, etc). But this is precisely the problem one needs a pandoc.write function to solve. 

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Re: pandoc.write helper function for Lua filters?

[Albert Krewinkel]

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It's on the agenda. We want to get things right, which takes time. Relevant 
GitHub issues and pull requests include:

   - https://github.com/jgm/pandoc/pull/5118
   - https://github.com/jgm/pandoc/issues/5221
   - https://github.com/jgm/pandoc/pull/5056

For now, I suggest to write a simple shell script filter which puts the 
output into a RawBlock element.

#!/bin/sh
FORMAT=$1
OUTPUT=$(pandoc --from=json --to=$FORMAT - | jq -aR --slurp .)
PANDOC_API_VERSION=$(pandoc --version | sed -ne 's/.*pandoc-types 
\([0-9.]*\).*/\1/p' | tr '.' ',')
printf '{"blocks":[{"t":"RawBlock", 
"c":["%s",%s]}],"meta":{},"pandoc-api-version":[%s]}\n' \
       $FORMAT "$OUTPUT" "$PANDOC_API_VERSION"

The filter can then be called from Lua via pandoc.utils.run_json_filter.

On Thursday, February 14, 2019 at 9:25:38 PM UTC+1, msprev wrote:
>
> The pandoc.read helper function is incredibly useful in Lua filters. Is 
> there any chance of adding a counterpart to expose similar functionality 
> for writers, e.g. a pandoc.write function that takes as arguments a pandoc 
> document and output format and yields as output a string of formatted text? 
>
> I've wanted to write a Lua filter to extract bits of the ast and kick them 
> out, for external use, as strings of html or strings of markdown. More 
> generally, when writing Lua filters, it would be incredibly useful for 
> diagnostic/debugging purposes to be able to print out bits of the ast to 
> the terminal as a string (e.g. in native output format) to make sure the 
> filter is working as expected.
>

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Re: pandoc.write helper function for Lua filters?

[msprev]

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Thanks. That is good to know it’s on the agenda!

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