forgejo-federation/modules/base/markdown.go

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// Copyright 2014 The Gogs Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package base
import (
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"bytes"
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"net/http"
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"path"
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"path/filepath"
"strings"
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"github.com/gogits/gfm"
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)
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func isletter(c byte) bool {
return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')
}
func isalnum(c byte) bool {
return (c >= '0' && c <= '9') || isletter(c)
}
var validLinks = [][]byte{[]byte("http://"), []byte("https://"), []byte("ftp://"), []byte("mailto://")}
func isLink(link []byte) bool {
for _, prefix := range validLinks {
if len(link) > len(prefix) && bytes.Equal(bytes.ToLower(link[:len(prefix)]), prefix) && isalnum(link[len(prefix)]) {
return true
}
}
return false
}
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func IsMarkdownFile(name string) bool {
name = strings.ToLower(name)
switch filepath.Ext(name) {
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case ".md", ".markdown", ".mdown":
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return true
}
return false
}
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func IsTextFile(data []byte) (string, bool) {
contentType := http.DetectContentType(data)
if strings.Index(contentType, "text/") != -1 {
return contentType, true
}
return contentType, false
}
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func IsReadmeFile(name string) bool {
name = strings.ToLower(name)
if len(name) < 6 {
return false
}
if name[:6] == "readme" {
return true
}
return false
}
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type CustomRender struct {
gfm.Renderer
urlPrefix string
}
func (options *CustomRender) Link(out *bytes.Buffer, link []byte, title []byte, content []byte) {
if len(link) > 0 && !isLink(link) {
if link[0] == '#' {
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// link = append([]byte(options.urlPrefix), link...)
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} else {
link = []byte(path.Join(options.urlPrefix, string(link)))
}
}
options.Renderer.Link(out, link, title, content)
}
func RenderMarkdown(rawBytes []byte, urlPrefix string) []byte {
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htmlFlags := 0
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// htmlFlags |= gfm.HTML_USE_XHTML
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// htmlFlags |= gfm.HTML_USE_SMARTYPANTS
// htmlFlags |= gfm.HTML_SMARTYPANTS_FRACTIONS
// htmlFlags |= gfm.HTML_SMARTYPANTS_LATEX_DASHES
htmlFlags |= gfm.HTML_SKIP_HTML
htmlFlags |= gfm.HTML_SKIP_STYLE
htmlFlags |= gfm.HTML_SKIP_SCRIPT
htmlFlags |= gfm.HTML_GITHUB_BLOCKCODE
htmlFlags |= gfm.HTML_OMIT_CONTENTS
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// htmlFlags |= gfm.HTML_COMPLETE_PAGE
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renderer := &CustomRender{
Renderer: gfm.HtmlRenderer(htmlFlags, "", ""),
urlPrefix: urlPrefix,
}
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// set up the parser
extensions := 0
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extensions |= gfm.EXTENSION_NO_INTRA_EMPHASIS
extensions |= gfm.EXTENSION_TABLES
extensions |= gfm.EXTENSION_FENCED_CODE
extensions |= gfm.EXTENSION_AUTOLINK
extensions |= gfm.EXTENSION_STRIKETHROUGH
extensions |= gfm.EXTENSION_HARD_LINE_BREAK
extensions |= gfm.EXTENSION_SPACE_HEADERS
extensions |= gfm.EXTENSION_NO_EMPTY_LINE_BEFORE_BLOCK
body := gfm.Markdown(rawBytes, renderer, extensions)
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return body
}