Re: Chapter TOC via filter?

[Cormac Relf <web-v7Sng7lNsVbsQp/K+IV0sw@public.gmane.org>]

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I have written something very similar that may be helpful. It wasn't for a 
ToC, but it does the visit-and-update-header-contents thing, and you could 
easily build a ToC as you go and insert it in a second pass.

https://github.com/cormacrelf/dotfiles/blob/master/pandoc/filters/aglc-headers.lua

On Saturday, January 12, 2019 at 4:21:40 AM UTC+11, BP wrote:
>
> You need to keep a counter for the chapter numbers, basically a variable 
> holding a number to which you add 1 each time you encounter a new chapter 
> and then replace the "local" number at the chapter level with the value of 
> this variable for each heading.
>
> BTW number incrementing in Lua is very old school: var = var + 1.
>
>
> Den fre 11 jan. 2019 13:57 skrev Axel Rauschmayer <raus...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org 
> <javascript:>>:
>
>>
>> I haven't looked at this in detail, but I would have 
>>> thought you could have extracted what you needed from 
>>> the `numbering` part of a Sec, which is just 
>>> a list of integers, e.g. 2, 4, 2. 
>>>
>>> If your top level header is parts, then the first 
>>> number is the part, the second the chapter, the 
>>> third the section.  Then it's just a matter of 
>>> converting the part to a roman numeral when the 
>>> other numbers are absent, and otherwise ignoring 
>>> the part and concatenating the other numbers 
>>> with '.' between... 
>>>
>>
>> The problem is that part numbers don’t affect chapter numbers:
>>
>>    - I. Part 1
>>       - Chapter 1
>>       - Chapter 2
>>    - II. Part 2
>>       - Chapter 3
>>       - Chapter 4
>>    
>> The first part of my filter numbers Headers properly (to be used with 
>> HTML and parts):
>>
>>    - Visit Headers via a filter.
>>    - Per Header:
>>       - Update a counter (with one integer per content entity): 
>>       depending on the level of the Header, while correctly handling part numbers.
>>       - Prefix the Header’s content with the properly formatted counter.
>>    
>> Given that I already track Headers and their numbers:
>>
>>    - I just additionally keep a mapping from chapter IDs to a list of 
>>    the chapter’s Headers.
>>    - For the chapter TOC, I transform this list to nested bullet lists, 
>>    in a second pass.
>>    
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