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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