Demonstrates a simple usage of AST in Blackfriday v2

custom-html.go

package main

import (
	"bytes"
	"fmt"

	bf "gopkg.in/russross/blackfriday.v2"
)

func main() {
	md := []byte("Foo\n\n---\n\nBar")
	html := bf.MarkdownCommon(md)
	ast := bf.Parse(md, bf.DefaultOptions)
	var buff bytes.Buffer
	defaultRenderer := bf.NewHTMLRenderer(bf.HTMLRendererParameters{})
	ast.Walk(func(node *bf.Node, entering bool) bf.WalkStatus {
		if node.Type == bf.HorizontalRule {
			buff.WriteString(`<div class="separator"></div>`)
		} else {
			defaultRenderer.RenderNode(&buff, node, entering)
		}
		return bf.GoToNext
	})
	fmt.Printf("md: %q\nhtml: %q\ncustom html: %q\n", md, html, buff.Bytes())
}

This looks awesome!

Quick comment. Since this is v2, let's not repeat past mistakes and use idiomatic Go style. Html should be HTML according to https://github.com/golang/go/wiki/CodeReviewComments#initialisms.

Oh, good catch, I missed it. Thanks!

Fixed.

Is there, perhaps an updated version of this example? I'm trying to use New along with Parse (or Run) to achieve the same thing, but not getting very far.

I sorted it out. Here's an example that works with the current blackfriday.v2 using New and Parse:

package main

import (
	"bytes"
	"fmt"
	bf "gopkg.in/russross/blackfriday.v2"
	"io/ioutil"
)

func main() {
	input, err := ioutil.ReadFile("sheet.md")
	if err != nil {
		fmt.Print(err)
	}
	md := bf.New(bf.WithExtensions(bf.CommonExtensions))
	ast := md.Parse(input)
	var buff bytes.Buffer
	r := bf.NewHTMLRenderer(bf.HTMLRendererParameters{})
	ast.Walk(func(node *bf.Node, entering bool) bf.WalkStatus {
		if node.Type == bf.Table {
			if entering {
				buff.WriteString("<div>\n")
				r.RenderNode(&buff, node, entering)
			} else {
				r.RenderNode(&buff, node, entering)
				buff.WriteString("</div>\n")
			}
		} else {
			r.RenderNode(&buff, node, entering)
		}
		return bf.GoToNext
	})
	fmt.Printf("%s\n", buff.Bytes())
}