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Use custom renderer for images too

This commit is contained in:
Jan-Lukas Else 2020-09-21 17:05:50 +02:00
parent dbbc498994
commit da18db0f74
1 changed files with 40 additions and 11 deletions
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51
markdown.go
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@ -38,7 +38,7 @@ func initMarkdown() {
emoji.WithEmojis(emojiGoLib()), emoji.WithEmojis(emojiGoLib()),
), ),
// Links // Links
newLinkExtension(), newCustomExtension(),
), ),
) )
} }
@ -65,25 +65,26 @@ func emojiGoLib() definition.Emojis {
} }
// Links // Links
type linkExtension struct{} type customExtension struct{}
func newLinkExtension() goldmark.Extender { func newCustomExtension() goldmark.Extender {
return &linkExtension{} return &customExtension{}
} }
func (l *linkExtension) Extend(m goldmark.Markdown) { func (l *customExtension) Extend(m goldmark.Markdown) {
m.Renderer().AddOptions(renderer.WithNodeRenderers( m.Renderer().AddOptions(renderer.WithNodeRenderers(
util.Prioritized(newLinkRenderer(), 500), util.Prioritized(newLinkRenderer(), 500),
)) ))
} }
type linkRenderer struct{} type customRenderer struct{}
func (l *linkRenderer) RegisterFuncs(r renderer.NodeRendererFuncRegisterer) { func (c *customRenderer) RegisterFuncs(r renderer.NodeRendererFuncRegisterer) {
r.Register(ast.KindLink, l.renderLink) r.Register(ast.KindLink, c.renderLink)
r.Register(ast.KindImage, c.renderImage)
} }
func (l *linkRenderer) renderLink(w util.BufWriter, _ []byte, node ast.Node, entering bool) (ast.WalkStatus, error) { func (c *customRenderer) renderLink(w util.BufWriter, _ []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
n := node.(*ast.Link) n := node.(*ast.Link)
if entering { if entering {
// Make URL absolute if it's relative // Make URL absolute if it's relative
@ -112,6 +113,34 @@ func (l *linkRenderer) renderLink(w util.BufWriter, _ []byte, node ast.Node, ent
return ast.WalkContinue, nil return ast.WalkContinue, nil
} }
func newLinkRenderer() renderer.NodeRenderer { func (c *customRenderer) renderImage(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
return &linkRenderer{} if !entering {
return ast.WalkContinue, nil
}
n := node.(*ast.Image)
// Make URL absolute if it's relative
destination := string(util.URLEscape(n.Destination, true))
if strings.HasPrefix(destination, "/") {
destination = appConfig.Server.PublicAddress + destination
}
_, _ = w.WriteString("<a href=\"")
_, _ = w.Write(util.EscapeHTML([]byte(destination)))
_, _ = w.WriteString("\">")
_, _ = w.WriteString("<img src=\"")
_, _ = w.Write(util.EscapeHTML([]byte(destination)))
_, _ = w.WriteString(`" alt="`)
_, _ = w.Write(util.EscapeHTML(n.Text(source)))
_ = w.WriteByte('"')
_, _ = w.WriteString(" loading=\"lazy\"")
if n.Title != nil {
_, _ = w.WriteString(` title="`)
_, _ = w.Write(n.Title)
_ = w.WriteByte('"')
}
_, _ = w.WriteString("></a>")
return ast.WalkSkipChildren, nil
}
func newLinkRenderer() renderer.NodeRenderer {
return &customRenderer{}
} }