Need help to extend block parsing (alignement)

[matwachich]

Hello!
I'm currently using Fyne for a big project, that will use markdown as entry text format for documents (-> HTML -> printer).

I want to extend makrdown parsing to be able to align text in paragraphs and headings (and all Block elements).

Here is the format I want to use:

<| text of the paragraph => left align (standard)
|> text of the paragraph => right align
<> text of the paragraph or ### <> Heading text => centered
== text of the paragraph => justified

Here is what I do, but after this I'm totally stuck (since I have no idea about Ast nodes...)

mkd := goldmark.New(
	goldmark.WithExtensions(extension.Table, extension.Typographer),
	goldmark.WithParserOptions(parser.WithBlockParsers(
		util.PrioritizedValue{
			Priority: 1,
			Value:    &BlockParser{},
		},
	)),
)

I also know that type BlockParser should implement the BlockParser interface, but no idea what to do in the functions.

Thanks for your help :)