How to extend inline markdown parsing?

[kensanata]

I'd be interested in parsing [[links]] and #hashtags but don't know where to start.

My naïve approach would be something like the following for hashtags (untested, since it doesn't compile). I'm pretty new to Go so I'm guessing the reason this fails is because I have no access to Parser.inlineCallback. I think the best solution would be to add something to Options that would allow passing a additional values for inlineCallback?

func hashtag(p *parser.Parser, data []byte, offset int) (int, ast.Node) {
    data = data[offset:]
    i := 0
    n := len(data)
    for i < n && !parser.IsSpace(data[i]) {
        i++
    }
    if i == 0 {
        return 0, nil
    }
    link := &ast.Link{
        Destination: append([]byte("/search?q=%23"), data[1:i]...),
        Title: data[0:i],
    }
    return i + 1, link
}

// renderHtml renders the Page.Body to HTML and sets Page.Html.
func (p *Page) renderHtml() {
    parser := parser.New()
    parser.inlineCallback['#'] = hashtag
    maybeUnsafeHTML := markdown.ToHTML(p.Body, parser, nil)
    p.Html = sanitizeBytes(maybeUnsafeHTML)
    p.Language = language(p.plainText())
}

[kensanata]

I've forked a version of the markdown library and made the following change: 302893f99160ba6fd0c3f58edd6e2611d6a7dd3a

This seems to do what I want. In my wiki, I was able to add the extension to the parser, and test it successfully: 4c4156c44e7a0e43c4ca671e9361243dc8065822

[kjk]

I've added Parser.RegisterInline() which should give you a way to register hashtag without forking the library.

[kensanata]

Thanks, works as intended!

[kensanata]

If you're interested, I can try and write extract the two uses I have for this for your examples directory?

• wikiLink
• hashtags
• registering them

[kjk]

Yes, that would be great.