mirror of https://github.com/gohugoio/hugo.git
86 lines
2.9 KiB
Go
86 lines
2.9 KiB
Go
// Copyright 2019 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package blackfriday
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import (
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"bytes"
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"strings"
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"github.com/russross/blackfriday"
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)
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// hugoHTMLRenderer wraps a blackfriday.Renderer, typically a blackfriday.Html
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// adding some custom behaviour.
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type hugoHTMLRenderer struct {
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c *blackfridayConverter
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blackfriday.Renderer
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}
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// BlockCode renders a given text as a block of code.
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// Pygments is used if it is setup to handle code fences.
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func (r *hugoHTMLRenderer) BlockCode(out *bytes.Buffer, text []byte, lang string) {
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if r.c.pygmentsCodeFences && (lang != "" || r.c.pygmentsCodeFencesGuessSyntax) {
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opts := r.c.pygmentsOptions
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str := strings.Trim(string(text), "\n\r")
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highlighted, _ := r.c.cfg.Highlight(str, lang, opts)
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out.WriteString(highlighted)
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} else {
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r.Renderer.BlockCode(out, text, lang)
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}
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}
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// ListItem adds task list support to the Blackfriday renderer.
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func (r *hugoHTMLRenderer) ListItem(out *bytes.Buffer, text []byte, flags int) {
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if !r.c.bf.TaskLists {
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r.Renderer.ListItem(out, text, flags)
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return
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}
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switch {
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case bytes.HasPrefix(text, []byte("[ ] ")):
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text = append([]byte(`<label><input type="checkbox" disabled class="task-list-item">`), text[3:]...)
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text = append(text, []byte(`</label>`)...)
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case bytes.HasPrefix(text, []byte("[x] ")) || bytes.HasPrefix(text, []byte("[X] ")):
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text = append([]byte(`<label><input type="checkbox" checked disabled class="task-list-item">`), text[3:]...)
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text = append(text, []byte(`</label>`)...)
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}
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r.Renderer.ListItem(out, text, flags)
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}
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// List adds task list support to the Blackfriday renderer.
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func (r *hugoHTMLRenderer) List(out *bytes.Buffer, text func() bool, flags int) {
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if !r.c.bf.TaskLists {
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r.Renderer.List(out, text, flags)
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return
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}
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marker := out.Len()
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r.Renderer.List(out, text, flags)
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if out.Len() > marker {
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list := out.Bytes()[marker:]
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if bytes.Contains(list, []byte("task-list-item")) {
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// Find the index of the first >, it might be 3 or 4 depending on whether
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// there is a new line at the start, but this is safer than just hardcoding it.
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closingBracketIndex := bytes.Index(list, []byte(">"))
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// Rewrite the buffer from the marker
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out.Truncate(marker)
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// Safely assuming closingBracketIndex won't be -1 since there is a list
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// May be either dl, ul or ol
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list := append(list[:closingBracketIndex], append([]byte(` class="task-list"`), list[closingBracketIndex:]...)...)
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out.Write(list)
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}
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}
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}
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