mirror of
https://github.com/gohugoio/hugo.git
synced 2024-12-30 23:22:13 +00:00
76 lines
2 KiB
Go
76 lines
2 KiB
Go
// Copyright 2018 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 livereloadinject
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
|
|
"github.com/gohugoio/hugo/helpers"
|
|
"github.com/gohugoio/hugo/transform"
|
|
)
|
|
|
|
type tag struct {
|
|
markup []byte
|
|
appendScript bool
|
|
}
|
|
|
|
var tags = []tag{
|
|
tag{markup: []byte("<head>"), appendScript: true},
|
|
tag{markup: []byte("<HEAD>"), appendScript: true},
|
|
tag{markup: []byte("</body>")},
|
|
tag{markup: []byte("</BODY>")},
|
|
}
|
|
|
|
// New creates a function that can be used
|
|
// to inject a script tag for the livereload JavaScript in a HTML document.
|
|
func New(port int) transform.Transformer {
|
|
return func(ft transform.FromTo) error {
|
|
b := ft.From().Bytes()
|
|
var idx = -1
|
|
var match tag
|
|
// We used to insert the livereload script right before the closing body.
|
|
// This does not work when combined with tools such as Turbolinks.
|
|
// So we try to inject the script as early as possible.
|
|
for _, t := range tags {
|
|
idx = bytes.Index(b, t.markup)
|
|
if idx != -1 {
|
|
match = t
|
|
break
|
|
}
|
|
}
|
|
|
|
c := make([]byte, len(b))
|
|
copy(c, b)
|
|
|
|
if idx == -1 {
|
|
_, err := ft.To().Write(c)
|
|
return err
|
|
}
|
|
|
|
script := []byte(fmt.Sprintf(`<script src="/livereload.js?port=%d&mindelay=10&v=2" data-no-instant defer></script>`, port))
|
|
|
|
i := idx
|
|
if match.appendScript {
|
|
i += len(match.markup)
|
|
}
|
|
|
|
c = append(c[:i], append(script, c[i:]...)...)
|
|
|
|
if _, err := ft.To().Write(c); err != nil {
|
|
helpers.DistinctWarnLog.Println("Failed to inject LiveReload script:", err)
|
|
}
|
|
return nil
|
|
}
|
|
}
|