Re: Pointers on modifying Plain objects(?)

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

"balaj...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org" <balaji.dutt-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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