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// Copyright 2017 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package markup
import (
"fmt"
"html"
"io"
"strings"
"code.gitea.io/gitea/modules/highlight"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/markup"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/util"
"github.com/alecthomas/chroma/v2"
"github.com/alecthomas/chroma/v2/lexers"
"github.com/niklasfasching/go-org/org"
)
func init() {
markup.RegisterRenderer(Renderer{})
}
// Renderer implements markup.Renderer for orgmode
type Renderer struct{}
var _ markup.PostProcessRenderer = (*Renderer)(nil)
// Name implements markup.Renderer
func (Renderer) Name() string {
return "orgmode"
}
// NeedPostProcess implements markup.PostProcessRenderer
func (Renderer) NeedPostProcess() bool { return true }
// Extensions implements markup.Renderer
func (Renderer) Extensions() []string {
return []string{".org"}
}
// SanitizerRules implements markup.Renderer
func (Renderer) SanitizerRules() []setting.MarkupSanitizerRule {
return []setting.MarkupSanitizerRule{}
}
// Render renders orgmode rawbytes to HTML
func Render(ctx *markup.RenderContext, input io.Reader, output io.Writer) error {
htmlWriter := org.NewHTMLWriter()
htmlWriter.HighlightCodeBlock = func(source, lang string, inline bool, params map[string]string) string {
defer func() {
if err := recover(); err != nil {
log.Error("Panic in HighlightCodeBlock: %v\n%s", err, log.Stack(2))
panic(err)
}
}()
var w strings.Builder
if _, err := w.WriteString(`<pre>`); err != nil {
return ""
}
lexer := lexers.Get(lang)
if lexer == nil && lang == "" {
lexer = lexers.Analyse(source)
if lexer == nil {
lexer = lexers.Fallback
}
lang = strings.ToLower(lexer.Config().Name)
}
if lexer == nil {
// include language-x class as part of commonmark spec
if _, err := w.WriteString(`<code class="chroma language-` + lang + `">`); err != nil {
return ""
}
if _, err := w.WriteString(html.EscapeString(source)); err != nil {
return ""
}
} else {
// include language-x class as part of commonmark spec
if _, err := w.WriteString(`<code class="chroma language-` + lang + `">`); err != nil {
return ""
}
lexer = chroma.Coalesce(lexer)
if _, err := w.WriteString(string(highlight.CodeFromLexer(lexer, source))); err != nil {
return ""
}
}
if _, err := w.WriteString("</code></pre>"); err != nil {
return ""
}
return w.String()
}
w := &Writer{
HTMLWriter: htmlWriter,
Ctx: ctx,
}
htmlWriter.ExtendingWriter = w
res, err := org.New().Silent().Parse(input, "").Write(w)
if err != nil {
return fmt.Errorf("orgmode.Render failed: %w", err)
}
_, err = io.Copy(output, strings.NewReader(res))
return err
}
// RenderString renders orgmode string to HTML string
func RenderString(ctx *markup.RenderContext, content string) (string, error) {
var buf strings.Builder
if err := Render(ctx, strings.NewReader(content), &buf); err != nil {
return "", err
}
return buf.String(), nil
}
// Render renders orgmode string to HTML string
func (Renderer) Render(ctx *markup.RenderContext, input io.Reader, output io.Writer) error {
return Render(ctx, input, output)
}
// Writer implements org.Writer
type Writer struct {
*org.HTMLWriter
Ctx *markup.RenderContext
}
const mailto = "mailto:"
func (r *Writer) resolveLink(node org.Node) string {
l, ok := node.(org.RegularLink)
if !ok {
l = org.RegularLink{URL: strings.TrimPrefix(org.String(node), "file:")}
}
link := html.EscapeString(l.URL)
if l.Protocol == "file" {
link = link[len("file:"):]
}
if len(link) > 0 && !markup.IsLinkStr(link) &&
link[0] != '#' && !strings.HasPrefix(link, mailto) {
var base string
if r.Ctx.IsWiki {
base = r.Ctx.Links.WikiLink()
} else if r.Ctx.Links.HasBranchInfo() {
base = r.Ctx.Links.SrcLink()
} else {
base = r.Ctx.Links.Base
}
switch l.Kind() {
case "image", "video":
base = r.Ctx.Links.ResolveMediaLink(r.Ctx.IsWiki)
}
link = util.URLJoin(base, link)
}
return link
}
// WriteRegularLink renders images, links or videos
func (r *Writer) WriteRegularLink(l org.RegularLink) {
link := r.resolveLink(l)
// Inspired by https://github.com/niklasfasching/go-org/blob/6eb20dbda93cb88c3503f7508dc78cbbc639378f/org/html_writer.go#L406-L427
switch l.Kind() {
case "image":
if l.Description == nil {
fmt.Fprintf(r, `<img src="%s" alt="%s" />`, link, link)
} else {
imageSrc := r.resolveLink(l.Description[0])
fmt.Fprintf(r, `<a href="%s"><img src="%s" alt="%s" /></a>`, link, imageSrc, imageSrc)
}
case "video":
if l.Description == nil {
fmt.Fprintf(r, `<video src="%s">%s</video>`, link, link)
} else {
videoSrc := r.resolveLink(l.Description[0])
fmt.Fprintf(r, `<a href="%s"><video src="%s">%s</video></a>`, link, videoSrc, videoSrc)
}
default:
description := link
if l.Description != nil {
description = r.WriteNodesAsString(l.Description...)
}
fmt.Fprintf(r, `<a href="%s">%s</a>`, link, description)
}
}
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