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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 markup
import (
"bytes"
"fmt"
"path"
"path/filepath"
"strings"
"github.com/russross/blackfriday"
"gogs.io/gogs/internal/conf"
"gogs.io/gogs/internal/lazyregexp"
"gogs.io/gogs/internal/tool"
)
// IsMarkdownFile reports whether name looks like a Markdown file based on its extension.
func IsMarkdownFile(name string) bool {
extension := strings.ToLower(filepath.Ext(name))
for _, ext := range conf.Markdown.FileExtensions {
if strings.ToLower(ext) == extension {
return true
}
}
return false
}
// MarkdownRenderer is a extended version of underlying Markdown render object.
type MarkdownRenderer struct {
blackfriday.Renderer
urlPrefix string
}
var validLinksPattern = lazyregexp.New(`^[a-z][\w-]+://|^mailto:`)
// isLink reports whether link fits valid format.
func isLink(link []byte) bool {
return validLinksPattern.Match(link)
}
// Link defines how formal links should be processed to produce corresponding HTML elements.
func (r *MarkdownRenderer) Link(out *bytes.Buffer, link, title, content []byte) {
if len(link) > 0 && !isLink(link) {
if link[0] != '#' {
link = []byte(path.Join(r.urlPrefix, string(link)))
}
}
r.Renderer.Link(out, link, title, content)
}
// AutoLink defines how auto-detected links should be processed to produce corresponding HTML elements.
// Reference for kind: https://github.com/russross/blackfriday/blob/master/markdown.go#L69-L76
func (r *MarkdownRenderer) AutoLink(out *bytes.Buffer, link []byte, kind int) {
if kind != blackfriday.LINK_TYPE_NORMAL {
r.Renderer.AutoLink(out, link, kind)
return
}
// Since this method could only possibly serve one link at a time,
// we do not need to find all.
if bytes.HasPrefix(link, []byte(conf.Server.ExternalURL)) {
m := CommitPattern.Find(link)
if m != nil {
m = bytes.TrimSpace(m)
i := bytes.Index(m, []byte("commit/"))
j := bytes.Index(m, []byte("#"))
if j == -1 {
j = len(m)
}
out.WriteString(fmt.Sprintf(` <code><a href="%s">%s</a></code>`, m, tool.ShortSHA1(string(m[i+7:j]))))
return
}
m = IssueFullPattern.Find(link)
if m != nil {
m = bytes.TrimSpace(m)
i := bytes.Index(m, []byte("issues/"))
j := bytes.Index(m, []byte("#"))
if j == -1 {
j = len(m)
}
index := string(m[i+7 : j])
fullRepoURL := conf.Server.ExternalURL + strings.TrimPrefix(r.urlPrefix, "/")
var link string
if strings.HasPrefix(string(m), fullRepoURL) {
// Use a short issue reference if the URL refers to this repository
link = fmt.Sprintf(`<a href="%s">#%s</a>`, m, index)
} else {
// Use a cross-repository issue reference if the URL refers to a different repository
repo := string(m[len(conf.Server.ExternalURL) : i-1])
link = fmt.Sprintf(`<a href="%s">%s#%s</a>`, m, repo, index)
}
out.WriteString(link)
return
}
}
r.Renderer.AutoLink(out, link, kind)
}
// ListItem defines how list items should be processed to produce corresponding HTML elements.
func (r *MarkdownRenderer) ListItem(out *bytes.Buffer, text []byte, flags int) {
// Detect procedures to draw checkboxes.
switch {
case bytes.HasPrefix(text, []byte("[ ] ")):
text = append([]byte(`<input type="checkbox" disabled="" />`), text[3:]...)
case bytes.HasPrefix(text, []byte("[x] ")):
text = append([]byte(`<input type="checkbox" disabled="" checked="" />`), text[3:]...)
}
r.Renderer.ListItem(out, text, flags)
}
// RawMarkdown renders content in Markdown syntax to HTML without handling special links.
func RawMarkdown(body []byte, urlPrefix string) []byte {
htmlFlags := 0
htmlFlags |= blackfriday.HTML_SKIP_STYLE
htmlFlags |= blackfriday.HTML_OMIT_CONTENTS
if conf.Smartypants.Enabled {
htmlFlags |= blackfriday.HTML_USE_SMARTYPANTS
if conf.Smartypants.Fractions {
htmlFlags |= blackfriday.HTML_SMARTYPANTS_FRACTIONS
}
if conf.Smartypants.Dashes {
htmlFlags |= blackfriday.HTML_SMARTYPANTS_DASHES
}
if conf.Smartypants.LatexDashes {
htmlFlags |= blackfriday.HTML_SMARTYPANTS_LATEX_DASHES
}
if conf.Smartypants.AngledQuotes {
htmlFlags |= blackfriday.HTML_SMARTYPANTS_ANGLED_QUOTES
}
}
renderer := &MarkdownRenderer{
Renderer: blackfriday.HtmlRenderer(htmlFlags, "", ""),
urlPrefix: urlPrefix,
}
// set up the parser
extensions := 0
extensions |= blackfriday.EXTENSION_NO_INTRA_EMPHASIS
extensions |= blackfriday.EXTENSION_TABLES
extensions |= blackfriday.EXTENSION_FENCED_CODE
extensions |= blackfriday.EXTENSION_AUTOLINK
extensions |= blackfriday.EXTENSION_STRIKETHROUGH
extensions |= blackfriday.EXTENSION_SPACE_HEADERS
extensions |= blackfriday.EXTENSION_NO_EMPTY_LINE_BEFORE_BLOCK
if conf.Markdown.EnableHardLineBreak {
extensions |= blackfriday.EXTENSION_HARD_LINE_BREAK
}
return blackfriday.Markdown(body, renderer, extensions)
}
// Markdown takes a string or []byte and renders to HTML in Markdown syntax with special links.
func Markdown(input interface{}, urlPrefix string, metas map[string]string) []byte {
return Render(TypeMarkdown, input, urlPrefix, metas)
}
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