mirror of
https://github.com/gohugoio/hugo.git
synced 2024-11-21 20:46:30 -05:00
98 lines
2.7 KiB
Go
98 lines
2.7 KiB
Go
// Copyright 2018 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 livereloadinject
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import (
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"bytes"
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"fmt"
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"html"
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"net/url"
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"strings"
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"github.com/gohugoio/hugo/common/loggers"
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"github.com/gohugoio/hugo/transform"
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)
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const warnMessage = `"head" or "body" tag is required in html to append livereload script. ` +
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"As a fallback, Hugo injects it somewhere but it might not work properly."
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var warnScript = fmt.Sprintf(`<script data-no-instant defer>console.warn('%s');</script>`, warnMessage)
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type tag struct {
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markup []byte
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appendScript bool
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warnRequired bool
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}
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var tags = []tag{
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{markup: []byte("<head"), appendScript: true},
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{markup: []byte("<HEAD"), appendScript: true},
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{markup: []byte("</body>")},
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{markup: []byte("</BODY>")},
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{markup: []byte("<html"), appendScript: true, warnRequired: true},
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{markup: []byte("<HTML"), appendScript: true, warnRequired: true},
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}
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// New creates a function that can be used
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// to inject a script tag for the livereload JavaScript in a HTML document.
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func New(baseURL url.URL) transform.Transformer {
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return func(ft transform.FromTo) error {
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b := ft.From().Bytes()
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idx := -1
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var match tag
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// We used to insert the livereload script right before the closing body.
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// This does not work when combined with tools such as Turbolinks.
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// So we try to inject the script as early as possible.
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for _, t := range tags {
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idx = bytes.Index(b, t.markup)
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if idx != -1 {
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match = t
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break
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}
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}
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path := strings.TrimSuffix(baseURL.Path, "/")
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src := path + "/livereload.js?mindelay=10&v=2"
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src += "&port=" + baseURL.Port()
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src += "&path=" + strings.TrimPrefix(path+"/livereload", "/")
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c := make([]byte, len(b))
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copy(c, b)
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if idx == -1 {
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idx = len(b)
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match = tag{warnRequired: true}
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}
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script := []byte(fmt.Sprintf(`<script src="%s" data-no-instant defer></script>`, html.EscapeString(src)))
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i := idx
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if match.appendScript {
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i += bytes.Index(b[i:], []byte(">")) + 1
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}
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if match.warnRequired {
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script = append(script, []byte(warnScript)...)
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}
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c = append(c[:i], append(script, c[i:]...)...)
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if _, err := ft.To().Write(c); err != nil {
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loggers.Log().Warnf("Failed to inject LiveReload script:", err)
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}
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return nil
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}
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}
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