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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"
"strings"
"github.com/gohugoio/hugo/config"
"github.com/miekg/mmark"
"github.com/russross/blackfriday"
)
// HugoHTMLRenderer wraps a blackfriday.Renderer, typically a blackfriday.Html
// Enabling Hugo to customise the rendering experience
type HugoHTMLRenderer struct {
cs *ContentSpec
*RenderingContext
blackfriday.Renderer
}
// BlockCode renders a given text as a block of code.
// Pygments is used if it is setup to handle code fences.
func (r *HugoHTMLRenderer) BlockCode(out *bytes.Buffer, text []byte, lang string) {
if r.Cfg.GetBool("pygmentsCodeFences") && (lang != "" || r.Cfg.GetBool("pygmentsCodeFencesGuessSyntax")) {
opts := r.Cfg.GetString("pygmentsOptions")
str := strings.Trim(string(text), "\n\r")
highlighted, _ := r.cs.Highlight(str, lang, opts)
out.WriteString(highlighted)
} else {
r.Renderer.BlockCode(out, text, lang)
}
}
// ListItem adds task list support to the Blackfriday renderer.
func (r *HugoHTMLRenderer) ListItem(out *bytes.Buffer, text []byte, flags int) {
if !r.Config.TaskLists {
r.Renderer.ListItem(out, text, flags)
return
}
switch {
case bytes.HasPrefix(text, []byte("[ ] ")):
text = append([]byte(`<label><input type="checkbox" disabled class="task-list-item">`), text[3:]...)
text = append(text, []byte(`</label>`)...)
case bytes.HasPrefix(text, []byte("[x] ")) || bytes.HasPrefix(text, []byte("[X] ")):
text = append([]byte(`<label><input type="checkbox" checked disabled class="task-list-item">`), text[3:]...)
text = append(text, []byte(`</label>`)...)
}
r.Renderer.ListItem(out, text, flags)
}
// List adds task list support to the Blackfriday renderer.
func (r *HugoHTMLRenderer) List(out *bytes.Buffer, text func() bool, flags int) {
if !r.Config.TaskLists {
r.Renderer.List(out, text, flags)
return
}
marker := out.Len()
r.Renderer.List(out, text, flags)
if out.Len() > marker {
list := out.Bytes()[marker:]
if bytes.Contains(list, []byte("task-list-item")) {
// Find the index of the first >, it might be 3 or 4 depending on whether
// there is a new line at the start, but this is safer than just hardcoding it.
closingBracketIndex := bytes.Index(list, []byte(">"))
// Rewrite the buffer from the marker
out.Truncate(marker)
// Safely assuming closingBracketIndex won't be -1 since there is a list
// May be either dl, ul or ol
list := append(list[:closingBracketIndex], append([]byte(` class="task-list"`), list[closingBracketIndex:]...)...)
out.Write(list)
}
}
}
// HugoMmarkHTMLRenderer wraps a mmark.Renderer, typically a mmark.html,
// enabling Hugo to customise the rendering experience.
type HugoMmarkHTMLRenderer struct {
cs *ContentSpec
mmark.Renderer
Cfg config.Provider
}
// BlockCode renders a given text as a block of code.
// Pygments is used if it is setup to handle code fences.
func (r *HugoMmarkHTMLRenderer) BlockCode(out *bytes.Buffer, text []byte, lang string, caption []byte, subfigure bool, callouts bool) {
if r.Cfg.GetBool("pygmentsCodeFences") && (lang != "" || r.Cfg.GetBool("pygmentsCodeFencesGuessSyntax")) {
str := strings.Trim(string(text), "\n\r")
highlighted, _ := r.cs.Highlight(str, lang, "")
out.WriteString(highlighted)
} else {
r.Renderer.BlockCode(out, text, lang, caption, subfigure, callouts)
}
}
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