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// Copyright 2016 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package helpers
import (
"bytes"
"html"
"github.com/miekg/mmark"
"github.com/russross/blackfriday"
jww "github.com/spf13/jwalterweatherman"
"github.com/spf13/viper"
)
type LinkResolverFunc func(ref string) (string, error)
type FileResolverFunc func(ref string) (string, error)
// HugoHTMLRenderer wraps a blackfriday.Renderer, typically a blackfriday.Html
// Enabling Hugo to customise the rendering experience
type HugoHTMLRenderer struct {
*RenderingContext
blackfriday.Renderer
}
func (renderer *HugoHTMLRenderer) BlockCode(out *bytes.Buffer, text []byte, lang string) {
if viper.GetBool("PygmentsCodeFences") && (lang != "" || viper.GetBool("PygmentsCodeFencesGuessSyntax")) {
opts := viper.GetString("PygmentsOptions")
str := html.UnescapeString(string(text))
out.WriteString(Highlight(str, lang, opts))
} else {
renderer.Renderer.BlockCode(out, text, lang)
}
}
func (renderer *HugoHTMLRenderer) Link(out *bytes.Buffer, link []byte, title []byte, content []byte) {
if renderer.LinkResolver == nil || bytes.HasPrefix(link, []byte("HAHAHUGOSHORTCODE")) {
// Use the blackfriday built in Link handler
renderer.Renderer.Link(out, link, title, content)
} else {
// set by SourceRelativeLinksEval
newLink, err := renderer.LinkResolver(string(link))
if err != nil {
newLink = string(link)
jww.ERROR.Printf("LinkResolver: %s", err)
}
renderer.Renderer.Link(out, []byte(newLink), title, content)
}
}
func (renderer *HugoHTMLRenderer) Image(out *bytes.Buffer, link []byte, title []byte, alt []byte) {
if renderer.FileResolver == nil || bytes.HasPrefix(link, []byte("HAHAHUGOSHORTCODE")) {
// Use the blackfriday built in Image handler
renderer.Renderer.Image(out, link, title, alt)
} else {
// set by SourceRelativeLinksEval
newLink, err := renderer.FileResolver(string(link))
if err != nil {
newLink = string(link)
jww.ERROR.Printf("FileResolver: %s", err)
}
renderer.Renderer.Image(out, []byte(newLink), title, alt)
}
}
// ListItem adds task list support to the Blackfriday renderer.
func (renderer *HugoHTMLRenderer) ListItem(out *bytes.Buffer, text []byte, flags int) {
if !renderer.Config.TaskLists {
renderer.Renderer.ListItem(out, text, flags)
return
}
switch {
case bytes.HasPrefix(text, []byte("[ ] ")):
text = append([]byte(`<input type="checkbox" disabled class="task-list-item">`), text[3:]...)
case bytes.HasPrefix(text, []byte("[x] ")) || bytes.HasPrefix(text, []byte("[X] ")):
text = append([]byte(`<input type="checkbox" checked disabled class="task-list-item">`), text[3:]...)
}
renderer.Renderer.ListItem(out, text, flags)
}
// List adds task list support to the Blackfriday renderer.
func (renderer *HugoHTMLRenderer) List(out *bytes.Buffer, text func() bool, flags int) {
if !renderer.Config.TaskLists {
renderer.Renderer.List(out, text, flags)
return
}
marker := out.Len()
renderer.Renderer.List(out, text, flags)
if out.Len() > marker {
list := out.Bytes()[marker:]
if bytes.Contains(list, []byte("task-list-item")) {
// Rewrite the buffer from the marker
out.Truncate(marker)
// May be either dl, ul or ol
list := append(list[:4], append([]byte(` class="task-list"`), list[4:]...)...)
out.Write(list)
}
}
}
// HugoMmarkHTMLRenderer wraps a mmark.Renderer, typically a mmark.html
// Enabling Hugo to customise the rendering experience
type HugoMmarkHTMLRenderer struct {
mmark.Renderer
}
func (renderer *HugoMmarkHTMLRenderer) BlockCode(out *bytes.Buffer, text []byte, lang string, caption []byte, subfigure bool, callouts bool) {
if viper.GetBool("PygmentsCodeFences") && (lang != "" || viper.GetBool("PygmentsCodeFencesGuessSyntax")) {
str := html.UnescapeString(string(text))
out.WriteString(Highlight(str, lang, ""))
} else {
renderer.Renderer.BlockCode(out, text, lang, caption, subfigure, callouts)
}
}
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