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

[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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