56 lines
1.7 KiB
Go
56 lines
1.7 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 metainject
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import (
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"bytes"
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"fmt"
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"regexp"
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"github.com/gohugoio/hugo/common/hugo"
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"github.com/gohugoio/hugo/helpers"
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"github.com/gohugoio/hugo/transform"
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)
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var metaTagsCheck = regexp.MustCompile(`(?i)<meta\s+name=['|"]?generator['|"]?`)
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var hugoGeneratorTag = fmt.Sprintf(`<meta name="generator" content="Hugo %s" />`, hugo.CurrentVersion)
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// HugoGenerator injects a meta generator tag for Hugo if none present.
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func HugoGenerator(ft transform.FromTo) error {
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b := ft.From().Bytes()
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if metaTagsCheck.Match(b) {
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if _, err := ft.To().Write(b); err != nil {
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helpers.DistinctWarnLog.Println("Failed to inject Hugo generator tag:", err)
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}
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return nil
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}
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head := "<head>"
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replace := []byte(fmt.Sprintf("%s\n\t%s", head, hugoGeneratorTag))
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newcontent := bytes.Replace(b, []byte(head), replace, 1)
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if len(newcontent) == len(b) {
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head := "<HEAD>"
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replace := []byte(fmt.Sprintf("%s\n\t%s", head, hugoGeneratorTag))
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newcontent = bytes.Replace(b, []byte(head), replace, 1)
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}
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if _, err := ft.To().Write(newcontent); err != nil {
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helpers.DistinctWarnLog.Println("Failed to inject Hugo generator tag:", err)
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}
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return nil
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}
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