2020-07-28 19:38:12 +00:00
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package main
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import (
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"bytes"
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2020-09-18 11:11:25 +00:00
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kemoji "github.com/kyokomi/emoji"
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2020-07-28 19:38:12 +00:00
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"github.com/yuin/goldmark"
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2020-09-18 10:34:52 +00:00
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"github.com/yuin/goldmark-emoji"
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"github.com/yuin/goldmark-emoji/definition"
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2020-09-21 14:53:20 +00:00
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"github.com/yuin/goldmark/ast"
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2020-07-28 19:38:12 +00:00
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"github.com/yuin/goldmark/extension"
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"github.com/yuin/goldmark/parser"
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2020-09-21 14:53:20 +00:00
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"github.com/yuin/goldmark/renderer"
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2020-07-28 19:38:12 +00:00
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"github.com/yuin/goldmark/renderer/html"
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2020-09-21 14:53:20 +00:00
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"github.com/yuin/goldmark/util"
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"strings"
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"sync"
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2020-07-28 19:38:12 +00:00
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)
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2020-09-18 11:11:25 +00:00
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var emojilib definition.Emojis
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var emojiOnce sync.Once
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2020-07-28 19:38:12 +00:00
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var markdown goldmark.Markdown
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2020-08-24 19:09:30 +00:00
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func initMarkdown() {
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2020-07-28 19:38:12 +00:00
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markdown = goldmark.New(
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goldmark.WithRendererOptions(
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html.WithUnsafe(),
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),
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goldmark.WithParserOptions(
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parser.WithAutoHeadingID(),
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),
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goldmark.WithExtensions(
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extension.GFM,
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extension.Footnote,
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extension.Typographer,
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// Emojis
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emoji.New(
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2020-09-21 14:53:20 +00:00
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emoji.WithEmojis(emojiGoLib()),
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),
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// Links
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newLinkExtension(),
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),
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)
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}
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2020-07-29 14:41:36 +00:00
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func renderMarkdown(source string) (content []byte, err error) {
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2020-07-28 19:38:12 +00:00
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var buffer bytes.Buffer
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err = markdown.Convert([]byte(source), &buffer)
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content = buffer.Bytes()
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2020-07-28 19:38:12 +00:00
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return
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}
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2020-09-18 11:11:25 +00:00
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2020-09-21 14:53:20 +00:00
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// Extensions etc...
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// All emojis from emoji lib
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func emojiGoLib() definition.Emojis {
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2020-09-18 11:11:25 +00:00
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emojiOnce.Do(func() {
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var emojis []definition.Emoji
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for shotcode, e := range kemoji.CodeMap() {
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emojis = append(emojis, definition.NewEmoji(e, []rune(e), strings.ReplaceAll(shotcode, ":", "")))
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}
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emojilib = definition.NewEmojis(emojis...)
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})
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return emojilib
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}
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2020-09-21 14:53:20 +00:00
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// Links
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type linkExtension struct{}
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func newLinkExtension() goldmark.Extender {
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return &linkExtension{}
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}
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func (l *linkExtension) Extend(m goldmark.Markdown) {
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m.Renderer().AddOptions(renderer.WithNodeRenderers(
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util.Prioritized(newLinkRenderer(), 500),
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))
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}
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type linkRenderer struct{}
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func (l *linkRenderer) RegisterFuncs(r renderer.NodeRendererFuncRegisterer) {
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r.Register(ast.KindLink, l.renderLink)
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}
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func (l *linkRenderer) renderLink(w util.BufWriter, _ []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
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n := node.(*ast.Link)
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if entering {
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// Make URL absolute if it's relative
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newDestination := string(util.URLEscape(n.Destination, true))
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if strings.HasPrefix(newDestination, "/") {
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newDestination = appConfig.Server.PublicAddress + newDestination
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}
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// Write URL
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_, _ = w.WriteString("<a href=\"")
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_, _ = w.Write(util.EscapeHTML([]byte(newDestination)))
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_ = w.WriteByte('"')
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// Open external links (links that start with "http") in new tab
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if strings.HasPrefix(string(n.Destination), "http") {
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_, _ = w.WriteString(` target="_blank" rel="noopener"`)
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}
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// Title
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if n.Title != nil {
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_, _ = w.WriteString(` title="`)
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_, _ = w.Write(n.Title)
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_ = w.WriteByte('"')
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}
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_ = w.WriteByte('>')
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} else {
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_, _ = w.WriteString("</a>")
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}
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return ast.WalkContinue, nil
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}
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func newLinkRenderer() renderer.NodeRenderer {
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return &linkRenderer{}
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}
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