mirror of
https://github.com/gohugoio/hugo.git
synced 2024-11-14 20:37:55 -05:00
135 lines
3.5 KiB
Go
135 lines
3.5 KiB
Go
// Copyright 2017 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 transform provides template functions for transforming content.
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package transform
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import (
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"bytes"
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"html"
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"html/template"
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"github.com/gohugoio/hugo/cache/namedmemcache"
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"github.com/gohugoio/hugo/deps"
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"github.com/gohugoio/hugo/helpers"
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"github.com/spf13/cast"
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)
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// New returns a new instance of the transform-namespaced template functions.
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func New(deps *deps.Deps) *Namespace {
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cache := namedmemcache.New()
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deps.BuildStartListeners.Add(
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func() {
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cache.Clear()
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})
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return &Namespace{
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cache: cache,
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deps: deps,
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}
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}
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// Namespace provides template functions for the "transform" namespace.
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type Namespace struct {
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cache *namedmemcache.Cache
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deps *deps.Deps
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}
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// Emojify returns a copy of s with all emoji codes replaced with actual emojis.
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//
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// See http://www.emoji-cheat-sheet.com/
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func (ns *Namespace) Emojify(s interface{}) (template.HTML, error) {
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ss, err := cast.ToStringE(s)
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if err != nil {
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return "", err
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}
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return template.HTML(helpers.Emojify([]byte(ss))), nil
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}
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// Highlight returns a copy of s as an HTML string with syntax
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// highlighting applied.
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func (ns *Namespace) Highlight(s interface{}, lang, opts string) (template.HTML, error) {
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ss, err := cast.ToStringE(s)
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if err != nil {
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return "", err
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}
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highlighted, _ := ns.deps.ContentSpec.Highlight(ss, lang, opts)
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return template.HTML(highlighted), nil
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}
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// HTMLEscape returns a copy of s with reserved HTML characters escaped.
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func (ns *Namespace) HTMLEscape(s interface{}) (string, error) {
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ss, err := cast.ToStringE(s)
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if err != nil {
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return "", err
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}
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return html.EscapeString(ss), nil
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}
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// HTMLUnescape returns a copy of with HTML escape requences converted to plain
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// text.
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func (ns *Namespace) HTMLUnescape(s interface{}) (string, error) {
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ss, err := cast.ToStringE(s)
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if err != nil {
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return "", err
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}
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return html.UnescapeString(ss), nil
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}
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var (
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markdownTrimPrefix = []byte("<p>")
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markdownTrimSuffix = []byte("</p>\n")
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markdownParagraphIndicator = []byte("<p")
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)
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// Markdownify renders a given input from Markdown to HTML.
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func (ns *Namespace) Markdownify(s interface{}) (template.HTML, error) {
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ss, err := cast.ToStringE(s)
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if err != nil {
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return "", err
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}
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m := ns.deps.ContentSpec.RenderBytes(
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&helpers.RenderingContext{
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Cfg: ns.deps.Cfg,
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Content: []byte(ss),
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PageFmt: "markdown",
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Config: ns.deps.ContentSpec.BlackFriday,
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},
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)
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// Strip if this is a short inline type of text.
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first := bytes.Index(m, markdownParagraphIndicator)
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last := bytes.LastIndex(m, markdownParagraphIndicator)
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if first == last {
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m = bytes.TrimPrefix(m, markdownTrimPrefix)
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m = bytes.TrimSuffix(m, markdownTrimSuffix)
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}
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return template.HTML(m), nil
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}
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// Plainify returns a copy of s with all HTML tags removed.
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func (ns *Namespace) Plainify(s interface{}) (string, error) {
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ss, err := cast.ToStringE(s)
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if err != nil {
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return "", err
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}
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return helpers.StripHTML(ss), nil
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}
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