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// 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"
"html"
"net/url"
"strings"
"github.com/gohugoio/hugo/common/loggers"
"github.com/gohugoio/hugo/transform"
)
const warnMessage = `"head" or "body" tag is required in html to append livereload script. ` +
"As a fallback, Hugo injects it somewhere but it might not work properly."
var warnScript = fmt.Sprintf(`<script data-no-instant defer>console.warn('%s');</script>`, warnMessage)
type tag struct {
markup []byte
appendScript bool
warnRequired bool
}
var tags = []tag{
{markup: []byte("<head"), appendScript: true},
{markup: []byte("<HEAD"), appendScript: true},
{markup: []byte("</body>")},
{markup: []byte("</BODY>")},
{markup: []byte("<html"), appendScript: true, warnRequired: true},
{markup: []byte("<HTML"), appendScript: true, warnRequired: true},
}
// New creates a function that can be used
// to inject a script tag for the livereload JavaScript in a HTML document.
func New(baseURL url.URL) transform.Transformer {
return func(ft transform.FromTo) error {
b := ft.From().Bytes()
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
}
}
path := strings.TrimSuffix(baseURL.Path, "/")
src := path + "/livereload.js?mindelay=10&v=2"
src += "&port=" + baseURL.Port()
src += "&path=" + strings.TrimPrefix(path+"/livereload", "/")
c := make([]byte, len(b))
copy(c, b)
if idx == -1 {
idx = len(b)
match = tag{warnRequired: true}
}
script := []byte(fmt.Sprintf(`<script src="%s" data-no-instant defer></script>`, html.EscapeString(src)))
i := idx
if match.appendScript {
i += bytes.Index(b[i:], []byte(">")) + 1
}
if match.warnRequired {
script = append(script, []byte(warnScript)...)
}
c = append(c[:i], append(script, c[i:]...)...)
if _, err := ft.To().Write(c); err != nil {
loggers.Log().Warnf("Failed to inject LiveReload script:", err)
}
return nil
}
}
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