mirror of
https://codeberg.org/forgejo/forgejo.git
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- Backport of #2276
- It's possible that the description of an `Regularlink` is `Text` and not
another `Regularlink`. Therefor if it's `Text`, convert it to an
`Regularlink` trough the 'old' behavior (pass it trough `org.String` and
trim `file:` prefix).
- Adds unit tests.
- Resolves https://codeberg.org/Codeberg/Community/issues/1430
(cherry picked from commit 385fc6ee6b
)
187 lines
4.8 KiB
Go
187 lines
4.8 KiB
Go
// Copyright 2017 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package markup
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import (
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"fmt"
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"html"
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"io"
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"strings"
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"code.gitea.io/gitea/modules/highlight"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/markup"
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"code.gitea.io/gitea/modules/setting"
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"code.gitea.io/gitea/modules/util"
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"github.com/alecthomas/chroma/v2"
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"github.com/alecthomas/chroma/v2/lexers"
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"github.com/niklasfasching/go-org/org"
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)
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func init() {
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markup.RegisterRenderer(Renderer{})
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}
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// Renderer implements markup.Renderer for orgmode
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type Renderer struct{}
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var _ markup.PostProcessRenderer = (*Renderer)(nil)
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// Name implements markup.Renderer
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func (Renderer) Name() string {
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return "orgmode"
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}
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// NeedPostProcess implements markup.PostProcessRenderer
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func (Renderer) NeedPostProcess() bool { return true }
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// Extensions implements markup.Renderer
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func (Renderer) Extensions() []string {
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return []string{".org"}
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}
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// SanitizerRules implements markup.Renderer
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func (Renderer) SanitizerRules() []setting.MarkupSanitizerRule {
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return []setting.MarkupSanitizerRule{}
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}
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// Render renders orgmode rawbytes to HTML
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func Render(ctx *markup.RenderContext, input io.Reader, output io.Writer) error {
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htmlWriter := org.NewHTMLWriter()
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htmlWriter.HighlightCodeBlock = func(source, lang string, inline bool, params map[string]string) string {
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defer func() {
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if err := recover(); err != nil {
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log.Error("Panic in HighlightCodeBlock: %v\n%s", err, log.Stack(2))
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panic(err)
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}
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}()
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var w strings.Builder
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if _, err := w.WriteString(`<pre>`); err != nil {
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return ""
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}
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lexer := lexers.Get(lang)
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if lexer == nil && lang == "" {
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lexer = lexers.Analyse(source)
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if lexer == nil {
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lexer = lexers.Fallback
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}
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lang = strings.ToLower(lexer.Config().Name)
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}
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if lexer == nil {
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// include language-x class as part of commonmark spec
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if _, err := w.WriteString(`<code class="chroma language-` + lang + `">`); err != nil {
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return ""
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}
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if _, err := w.WriteString(html.EscapeString(source)); err != nil {
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return ""
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}
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} else {
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// include language-x class as part of commonmark spec
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if _, err := w.WriteString(`<code class="chroma language-` + lang + `">`); err != nil {
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return ""
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}
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lexer = chroma.Coalesce(lexer)
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if _, err := w.WriteString(string(highlight.CodeFromLexer(lexer, source))); err != nil {
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return ""
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}
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}
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if _, err := w.WriteString("</code></pre>"); err != nil {
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return ""
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}
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return w.String()
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}
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w := &Writer{
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HTMLWriter: htmlWriter,
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Ctx: ctx,
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}
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htmlWriter.ExtendingWriter = w
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res, err := org.New().Silent().Parse(input, "").Write(w)
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if err != nil {
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return fmt.Errorf("orgmode.Render failed: %w", err)
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}
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_, err = io.Copy(output, strings.NewReader(res))
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return err
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}
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// RenderString renders orgmode string to HTML string
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func RenderString(ctx *markup.RenderContext, content string) (string, error) {
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var buf strings.Builder
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if err := Render(ctx, strings.NewReader(content), &buf); err != nil {
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return "", err
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}
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return buf.String(), nil
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}
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// Render renders orgmode string to HTML string
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func (Renderer) Render(ctx *markup.RenderContext, input io.Reader, output io.Writer) error {
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return Render(ctx, input, output)
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}
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// Writer implements org.Writer
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type Writer struct {
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*org.HTMLWriter
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Ctx *markup.RenderContext
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}
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const mailto = "mailto:"
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func (r *Writer) resolveLink(node org.Node) string {
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l, ok := node.(org.RegularLink)
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if !ok {
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l = org.RegularLink{URL: strings.TrimPrefix(org.String(node), "file:")}
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}
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link := html.EscapeString(l.URL)
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if l.Protocol == "file" {
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link = link[len("file:"):]
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}
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if len(link) > 0 && !markup.IsLinkStr(link) &&
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link[0] != '#' && !strings.HasPrefix(link, mailto) {
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base := r.Ctx.Links.Base
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switch l.Kind() {
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case "image", "video":
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base = r.Ctx.Links.ResolveMediaLink(r.Ctx.IsWiki)
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}
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link = util.URLJoin(base, link)
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}
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return link
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}
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// WriteRegularLink renders images, links or videos
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func (r *Writer) WriteRegularLink(l org.RegularLink) {
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link := r.resolveLink(l)
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// Inspired by https://github.com/niklasfasching/go-org/blob/6eb20dbda93cb88c3503f7508dc78cbbc639378f/org/html_writer.go#L406-L427
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switch l.Kind() {
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case "image":
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if l.Description == nil {
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fmt.Fprintf(r, `<img src="%s" alt="%s" />`, link, link)
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} else {
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imageSrc := r.resolveLink(l.Description[0])
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fmt.Fprintf(r, `<a href="%s"><img src="%s" alt="%s" /></a>`, link, imageSrc, imageSrc)
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}
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case "video":
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if l.Description == nil {
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fmt.Fprintf(r, `<video src="%s">%s</video>`, link, link)
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} else {
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videoSrc := r.resolveLink(l.Description[0])
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fmt.Fprintf(r, `<a href="%s"><video src="%s">%s</video></a>`, link, videoSrc, videoSrc)
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}
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default:
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description := link
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if l.Description != nil {
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description = r.WriteNodesAsString(l.Description...)
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}
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fmt.Fprintf(r, `<a href="%s" title="%s">%s</a>`, link, description, description)
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}
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}
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