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https://github.com/gohugoio/hugo.git
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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) ```
72 lines
2.2 KiB
Go
72 lines
2.2 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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"fmt"
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"html"
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"net/url"
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"regexp"
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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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var (
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ignoredSyntax = regexp.MustCompile(`(?s)^(?:\s+|<!--.*?-->|<\?.*?\?>)*`)
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tagsBeforeHead = []*regexp.Regexp{
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regexp.MustCompile(`(?is)^<!doctype\s[^>]*>`),
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regexp.MustCompile(`(?is)^<html(?:\s[^>]*)?>`),
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regexp.MustCompile(`(?is)^<head(?:\s[^>]*)?>`),
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}
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)
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// New creates a function that can be used to inject a script tag for
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// the livereload JavaScript at the start of an HTML document's head.
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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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// We find the start of the head by reading past (in order)
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// the doctype declaration, HTML start tag and head start tag,
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// all of which are optional, and any whitespace, comments, or
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// XML instructions in-between.
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idx := 0
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for _, tag := range tagsBeforeHead {
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idx += len(ignoredSyntax.Find(b[idx:]))
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idx += len(tag.Find(b[idx:]))
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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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script := []byte(fmt.Sprintf(`<script src="%s" data-no-instant defer></script>`, html.EscapeString(src)))
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c := make([]byte, len(b)+len(script))
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copy(c, b[:idx])
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copy(c[idx:], script)
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copy(c[idx+len(script):], b[idx:])
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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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