mirror of
https://github.com/gohugoio/hugo.git
synced 2024-11-29 16:42:06 -05:00
8f60c0c1ec
As suggested by @DominoPivot ``` name old time/op new time/op delta LiveReloadInject-10 1.11µs ± 2% 1.04µs ± 2% -6.45% (p=0.029 n=4+4) name old alloc/op new alloc/op delta LiveReloadInject-10 1.23kB ± 0% 0.89kB ± 0% -27.69% (p=0.029 n=4+4) name old allocs/op new allocs/op delta LiveReloadInject-10 12.0 ± 0% 10.0 ± 0% -16.67% (p=0.029 n=4+4) ```
71 lines
2.2 KiB
Go
71 lines
2.2 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 (
|
|
"fmt"
|
|
"html"
|
|
"net/url"
|
|
"regexp"
|
|
"strings"
|
|
|
|
"github.com/gohugoio/hugo/common/loggers"
|
|
|
|
"github.com/gohugoio/hugo/transform"
|
|
)
|
|
|
|
var (
|
|
ignoredSyntax = regexp.MustCompile(`(?s)^(?:\s+|<!--.*?-->|<\?.*?\?>)*`)
|
|
tagsBeforeHead = []*regexp.Regexp{
|
|
regexp.MustCompile(`(?is)^<!doctype\s[^>]*>`),
|
|
regexp.MustCompile(`(?is)^<html(?:\s[^>]*)?>`),
|
|
regexp.MustCompile(`(?is)^<head(?:\s[^>]*)?>`),
|
|
}
|
|
)
|
|
|
|
// New creates a function that can be used to inject a script tag for
|
|
// the livereload JavaScript at the start of an HTML document's head.
|
|
func New(baseURL url.URL) transform.Transformer {
|
|
return func(ft transform.FromTo) error {
|
|
b := ft.From().Bytes()
|
|
|
|
// We find the start of the head by reading past (in order)
|
|
// the doctype declaration, HTML start tag and head start tag,
|
|
// all of which are optional, and any whitespace, comments, or
|
|
// XML instructions in-between.
|
|
idx := 0
|
|
for _, tag := range tagsBeforeHead {
|
|
idx += len(ignoredSyntax.Find(b[idx:]))
|
|
idx += len(tag.Find(b[idx:]))
|
|
}
|
|
|
|
path := strings.TrimSuffix(baseURL.Path, "/")
|
|
|
|
src := path + "/livereload.js?mindelay=10&v=2"
|
|
src += "&port=" + baseURL.Port()
|
|
src += "&path=" + strings.TrimPrefix(path+"/livereload", "/")
|
|
|
|
script := []byte(fmt.Sprintf(`<script src="%s" data-no-instant defer></script>`, html.EscapeString(src)))
|
|
|
|
c := make([]byte, len(b)+len(script))
|
|
copy(c, b[:idx])
|
|
copy(c[idx:], script)
|
|
copy(c[idx+len(script):], b[idx:])
|
|
|
|
if _, err := ft.To().Write(c); err != nil {
|
|
loggers.Log().Warnf("Failed to inject LiveReload script:", err)
|
|
}
|
|
return nil
|
|
}
|
|
}
|