diff options
Diffstat (limited to 'markup/blackfriday/renderer.go')
-rw-r--r-- | markup/blackfriday/renderer.go | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/markup/blackfriday/renderer.go b/markup/blackfriday/renderer.go new file mode 100644 index 000000000..9f4d44e02 --- /dev/null +++ b/markup/blackfriday/renderer.go @@ -0,0 +1,85 @@ +// Copyright 2019 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 blackfriday + +import ( + "bytes" + "strings" + + "github.com/russross/blackfriday" +) + +// hugoHTMLRenderer wraps a blackfriday.Renderer, typically a blackfriday.Html +// adding some custom behaviour. +type hugoHTMLRenderer struct { + c *blackfridayConverter + 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.c.pygmentsCodeFences && (lang != "" || r.c.pygmentsCodeFencesGuessSyntax) { + opts := r.c.pygmentsOptions + str := strings.Trim(string(text), "\n\r") + highlighted, _ := r.c.cfg.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.c.bf.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.c.bf.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) + } + } +} |