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obsidian_embed.go
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obsidian_embed.go
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package main
import (
"fmt"
"net/url"
"strings"
"github.com/yuin/goldmark"
"github.com/yuin/goldmark/ast"
"github.com/yuin/goldmark/parser"
"github.com/yuin/goldmark/renderer"
"github.com/yuin/goldmark/text"
"github.com/yuin/goldmark/util"
)
// YouTube struct represents a YouTube Video embed of the Markdown text.
type YouTube struct {
ast.Image
Video string
}
// KindYouTube is a NodeKind of the YouTube node.
var KindYouTube = ast.NewNodeKind("YouTube")
// Kind implements Node.Kind.
func (n *YouTube) Kind() ast.NodeKind {
return KindYouTube
}
// NewYouTube returns a new YouTube node.
func NewYouTube(img *ast.Image, v string) *YouTube {
c := &YouTube{
Image: *img,
Video: v,
}
c.Destination = img.Destination
c.Title = img.Title
return c
}
// Twitter struct represents a Twitter/X embed of the Markdown text.
type Twitter struct {
ast.Image
TweetID string
}
// KindTwitter is a NodeKind of the Twitter node.
var KindTwitter = ast.NewNodeKind("Twitter")
// Kind implements Node.Kind.
func (n *Twitter) Kind() ast.NodeKind {
return KindTwitter
}
// NewTwitter returns a new Twitter node.
func NewTwitter(img *ast.Image, tweetID string) *Twitter {
c := &Twitter{
Image: *img,
TweetID: tweetID,
}
c.Destination = img.Destination
c.Title = img.Title
return c
}
type astTransformer struct{}
var defaultASTTransformer = &astTransformer{}
func (a *astTransformer) Transform(node *ast.Document, reader text.Reader, pc parser.Context) {
replaceImages := func(n ast.Node, entering bool) (ast.WalkStatus, error) {
if !entering {
return ast.WalkContinue, nil
}
if n.Kind() != ast.KindImage {
return ast.WalkContinue, nil
}
img, ok := n.(*ast.Image)
if !ok {
return ast.WalkContinue, nil
}
u, err := url.Parse(string(img.Destination))
if err != nil {
msg := ast.NewString([]byte(fmt.Sprintf("<!-- %s -->", err)))
msg.SetCode(true)
n.Parent().InsertAfter(n.Parent(), n, msg)
return ast.WalkContinue, nil
}
switch {
case u.Host == "www.youtube.com" && u.Path == "/watch":
v := u.Query().Get("v")
if v != "" {
yt := NewYouTube(img, v)
n.Parent().ReplaceChild(n.Parent(), n, yt)
}
case u.Host == "twitter.com" || u.Host == "x.com":
parts := strings.Split(u.Path, "/")
if len(parts) >= 4 && parts[2] == "status" {
tw := NewTwitter(img, parts[3])
n.Parent().ReplaceChild(n.Parent(), n, tw)
}
}
return ast.WalkContinue, nil
}
ast.Walk(node, replaceImages)
}
// HTMLRenderer struct is a renderer.NodeRenderer implementation for the extension.
type HTMLRenderer struct{}
// NewHTMLRenderer builds a new HTMLRenderer with given options and returns it.
func NewHTMLRenderer() renderer.NodeRenderer {
r := &HTMLRenderer{}
return r
}
// RegisterFuncs implements NodeRenderer.RegisterFuncs.
func (r *HTMLRenderer) RegisterFuncs(reg renderer.NodeRendererFuncRegisterer) {
reg.Register(KindYouTube, r.renderYouTubeVideo)
reg.Register(KindTwitter, r.renderTwitterEmbed)
}
func (r *HTMLRenderer) renderYouTubeVideo(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
if entering {
return ast.WalkContinue, nil
}
yt := node.(*YouTube)
w.Write([]byte(`<iframe width="560" height="315" class="youtube-video" src="https://www.youtube.com/embed/` + yt.Video + `" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>`))
return ast.WalkContinue, nil
}
func (r *HTMLRenderer) renderTwitterEmbed(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
if entering {
return ast.WalkContinue, nil
}
tw := node.(*Twitter)
w.Write([]byte(`<blockquote class="twitter-tweet" data-theme="dark"><a href="https://twitter.com/x/status/` + tw.TweetID + `"></a></blockquote><script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>`))
return ast.WalkContinue, nil
}
type ObsidianEmbedExtender struct{}
func (e *ObsidianEmbedExtender) Extend(m goldmark.Markdown) {
m.Parser().AddOptions(
parser.WithASTTransformers(
util.Prioritized(defaultASTTransformer, 500),
),
)
m.Renderer().AddOptions(
renderer.WithNodeRenderers(
util.Prioritized(NewHTMLRenderer(), 500),
),
)
}