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livereloadinject: Save some allocations
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) ```
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1 changed files with 12 additions and 10 deletions
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@ -25,12 +25,14 @@ import (
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"github.com/gohugoio/hugo/transform"
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)
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var ignoredSyntax = regexp.MustCompile(`(?s)^(?:\s+|<!--.*?-->|<\?.*?\?>)*`)
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var 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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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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@ -54,12 +56,12 @@ func New(baseURL url.URL) transform.Transformer {
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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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script := []byte(fmt.Sprintf(`<script src="%s" data-no-instant defer></script>`, html.EscapeString(src)))
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c = append(c[:idx], append(script, c[idx:]...)...)
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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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