Re: Pointers on modifying Plain objects(?)

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

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We could do this by passing the full content to the strikeout constructor. We'd remove, then re-add the checkbox later:

plain.content:remove(2) -- remove space
plain.content:remove(1) -- remove checkbox
plain.content = done_marker .. 
  pandoc.Strikeout(plain.content)


Am 24. Dezember 2022 09:37:58 MEZ schrieb "balaj...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org" <balaji.dutt@gmail.com>:
>Thanks for the pointers Albert! It did help me get started. Unfortunately 
>when I started looping through the Plain object, I realized that the 
>individual strings were represented as separate elements so there did not 
>seem to be an easy way to apply a strikethrough formatting for the entire 
>sentence. The best I would be able to do was apply the strikethrough 
>word-by-word but with that approach, the final HTML did not look very 
>pleasing.
>
>In the end, I wound up writing a small Python script that would modify a 
>file with the pandoc native format directly (outside of pandoc) and then 
>feed the modified native format file back into pandoc. After a couple of 
>false starts with the regex and then the native output becoming invalid, 
>I've got it working fairly well for my purposes.
>
>On Thursday, 22 December 2022 at 20:21:19 UTC+8 Albert Krewinkel wrote:
>
>> "balaj...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org" <balaj...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>>
>> > The specific scenario I'm looking at is a Markdown file such as this:
>> >
>> > ### Todo
>> > - [ ] Foo
>> > - [X] Quux Qux
>>
>> This is an interesting case because it is more complex than it seems.
>> The reason is pandoc's `task_list` extension that causes pandoc to
>> handle these checkboxes specially, converting them to [Str "☐", Space]
>> and [Str "☒", Space]. So we'll have to match on that in our filter.
>>
>> A good approach would be to write a filter for Plain, like so:
>>
>> ``` lua
>> function Plain (plain)
>> -- modify the object here
>> return plain
>> end
>> ```
>>
>> Pandoc will then do all necessary document traversals automatically,
>> the function gets applied to all `Plain` elements in the document.
>>
>> To check for the prefix, we'd do something like
>>
>> ``` lua
>> local done_marker = pandoc.List{pandoc.Str '☒', pandoc.Space()}
>> local prefix = pandoc.List{plain.content[1], plain.content[2]}
>> if prefix == done_marker then
>> -- modify content
>> end
>> ```
>>
>> I hope that's enough to get you started. Happy hacking!
>>
>>
>> -- 
>> Albert Krewinkel
>> GPG: 8eed e3e2 e8c5 6f18 81fe e836 388d c0b2 1f63 1124
>>
>
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