Re: Prevent backslash escaping and kept YAML header in Pandoc Markdown to PHP Extra Markdown conversion

[Sean McDaniel <sean.m.mcdaniel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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BPJ, that did the trick. Thank you for your help!

On Fri, Aug 13, 2021 at 3:41 PM BPJ <melroch-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

> Sorry a typo on line 112: change `local keys` into `local keys = {}`
>
> I must have hit undo one time too many!
>
> Den fre 13 aug. 2021 19:01Sean McDaniel <sean.m.mcdaniel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> skrev:
>
>> Thank you BP for the Lua filter and the explanation. I have attempted to
>> run your Lua filter without modifications as a test and I get the following
>> error:
>>
>> Error running filter meta-whitelist.lua:
>> meta-whitelist.lua:114: attempt to get length of a nil value (local
>> 'keys')
>> stack traceback:
>> meta-whitelist.lua:114: in function 'Meta'
>>
>> The issued pandoc command was (note that I put the Lua filter after the
>> crossref filter):
>>
>> pandoc -s --markdown-headings=atx \
>>     --filter=pandoc-crossref --lua-filter=meta-whitelist.lua \
>>     --from=markdown+raw_attribute+yaml_metadata_block \
>>     --to=markdown_phpextra+yaml_metadata_block \
>>     -o myfile_phpextra.md myfile.md
>>
>> I get the same error with or without the crossref filter.
>>
>> As you've explained (thanks) the metadata fields are created by the
>> pandoc-crossref filter. The following without filters works as
>> expected---both my YAML header and Markdown blocks are preserved:
>>
>> pandoc -s --markdown-headings=atx \
>>     --from=markdown+raw_attribute+yaml_metadata_block \
>>     --to=markdown_phpextra+yaml_metadata_block \
>>     -o myfile_phpextra.md myfile.md
>>
>> The above will probably work for most of my needs, but I was wondering if
>> there's a simple Lua filter fix to get it working for my case.
>>
>> Regards,
>>
>> Sean
>>
>> On Tue, Aug 10, 2021 at 3:47 PM John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org> wrote:
>>
>>>
>>> I see. Well, messing with templates won't help.
>>> You could write a filter that is applied AFTER
>>> pandoc-crossref and removes these metadata fields.
>>>
>>> BPJ <melroch-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>>>
>>> > They are pandoc-crossref configuration options, passed through the
>>> metadata
>>> > since that is the most convenient way to let the user "communicate"
>>> with
>>> > filters.
>>> >
>>> > Den tis 10 aug. 2021 20:09John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org> skrev:
>>> >
>>> >> Sean McDaniel <sean.m.mcdaniel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>>> >>
>>> >> > Thank you John. Your suggestions got me most of the way there: the
>>> >> markdown
>>> >> > code blocks with the +raw_attribute processing are correctly passing
>>> >> > through the sections I want untouched and the +yaml_metadata_block
>>> is
>>> >> > keeping the header content I want.
>>> >> >
>>> >> > The remaining issue which is giving me trouble is that
>>> +yaml_header_block
>>> >> > is also including all other document metadata and not just the
>>> variables
>>> >> > I've defined, i.e. stuff like
>>> >> >
>>> >> > autoEqnLabels: false
>>> >> > autoSectionLabels: false
>>> >> > ccsDelim: ", "
>>> >> > ccsLabelSep:  —
>>> >> > ccsTemplate: |
>>> >> >   *i*
>>> >> >   *c**c**s**L**a**b**e**l**S**e**p*
>>> >> >   *t*
>>> >> > chapDelim: .
>>> >> >
>>> >> > and so forth.
>>> >>
>>> >> I'm not sure why these are going in the metadata -- what is
>>> >> setting these metadata elements, if you're not doing it?
>>> >> maybe I don't understand the issue.
>>> >>
>>> >> --
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>>> >>
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>>>
>>

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