Re: Lua filter broken after upgrade to 2.15 (macOS)

[Albert Krewinkel <albert+pandoc-9EawChwDxG8hFhg+JK9F0w@public.gmane.org>]

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I see now how this worked: if there is no string passed into pandoc.Str, then the resulting Lua object looks like an empty list to the unmarshalling function. The processed element is therefore sliced out of the document.

This was never intended to work and could be considered a pandoc bug, so I'm hesitant to recreate the old behavior.


Am 31. Oktober 2021 19:22:37 MEZ schrieb Albert Krewinkel <albert+pandoc-9EawChwDxG8hFhg+JK9F0w@public.gmane.org>:
>That seems reasonable. Although, tbh, I'm surprised that this ever worked at all. Looking at the old code it seems like it shouldn't.
>
>I'll take a look.
>
>Am 31. Oktober 2021 18:43:30 MEZ schrieb John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org>:
>>
>>Perhaps for backwards compatibility we should fix things
>>so that Str with no argument is treated as an empty string?
>>
>>John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org> writes:
>>
>>> I can confirm that using pandoc.Str('') instead of pandoc.Str()
>>> works.
>>>
>>>
>>> Albert Krewinkel <albert+pandoc-9EawChwDxG8hFhg+JK9F0w@public.gmane.org> writes:
>>>
>>>> Can't test right now, but can you try to pass an empty string to pandoc.Str('')?
>>>>
>>>> Am 31. Oktober 2021 14:18:16 MEZ schrieb Philipp <philipp.kupferschmied-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>:
>>>>>Hello everyone,
>>>>>
>>>>>I'm experiencing a problem with a self-written Lua-filter after upgrading 
>>>>>to 2.15.
>>>>>
>>>>>The filter ran (and still runs) fine with older versions of pandoc, but 
>>>>>with 2.15 I get the following error:
>>>>>
>>>>>PandocLuaError "Error during function call:\n\tstring expected, got 
>>>>>string\n\twhile retrieving function argument string\n\twhile retrieving 
>>>>>arguments for function Str\nstack traceback:\n\t[C]: in field 
>>>>>'Str'\n\tscripts/klausur.lua:11: in function 
>>>>><scripts/klausur.lua:9>\n\t[C]: in ?\n\t[C]: in field 
>>>>>'walk_block'\n\tscripts/klausur.lua:8: in function 'processheader'"
>>>>>
>>>>>stack traceback:
>>>>>
>>>>>[C]: in field 'walk_block'
>>>>>
>>>>>scripts/klausur.lua:8: in function 'processheader'
>>>>>The corresponding Lua code looks like this (I hope the formatting is 
>>>>>preserved):
>>>>>
>>>>> 7 function processheader(elem)
>>>>> 8     return pandoc.walk_block(elem, {
>>>>> 9         Str = function(elem)
>>>>>10             if string.match(elem.text, "%%%d+p%%") ~= nil then
>>>>>11                 return pandoc.Str()
>>>>>12             end
>>>>>13         end
>>>>>14     })
>>>>>15 end
>>>>>
>>>>>I'd be thankful for any suggestion what is going wrong here.
>>>>>
>>>>>Kind regards,
>>>>>Philipp
>>>>>
>>>>>
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>>>>
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>>
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