github.com/olliephillips/hugo@v0.42.2/transform/hugogeneratorinject.go (about) 1 // Copyright 2016 The Hugo Authors. All rights reserved. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // http://www.apache.org/licenses/LICENSE-2.0 7 // 8 // Unless required by applicable law or agreed to in writing, software 9 // distributed under the License is distributed on an "AS IS" BASIS, 10 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 11 // See the License for the specific language governing permissions and 12 // limitations under the License. 13 14 package transform 15 16 import ( 17 "bytes" 18 "fmt" 19 "regexp" 20 21 "github.com/gohugoio/hugo/helpers" 22 ) 23 24 var metaTagsCheck = regexp.MustCompile(`(?i)<meta\s+name=['|"]?generator['|"]?`) 25 var hugoGeneratorTag = fmt.Sprintf(`<meta name="generator" content="Hugo %s" />`, helpers.CurrentHugoVersion) 26 27 // HugoGeneratorInject injects a meta generator tag for Hugo if none present. 28 func HugoGeneratorInject(ct contentTransformer) { 29 if metaTagsCheck.Match(ct.Content()) { 30 if _, err := ct.Write(ct.Content()); err != nil { 31 helpers.DistinctWarnLog.Println("Failed to inject Hugo generator tag:", err) 32 } 33 return 34 } 35 36 head := "<head>" 37 replace := []byte(fmt.Sprintf("%s\n\t%s", head, hugoGeneratorTag)) 38 newcontent := bytes.Replace(ct.Content(), []byte(head), replace, 1) 39 40 if len(newcontent) == len(ct.Content()) { 41 head := "<HEAD>" 42 replace := []byte(fmt.Sprintf("%s\n\t%s", head, hugoGeneratorTag)) 43 newcontent = bytes.Replace(ct.Content(), []byte(head), replace, 1) 44 } 45 46 if _, err := ct.Write(newcontent); err != nil { 47 helpers.DistinctWarnLog.Println("Failed to inject Hugo generator tag:", err) 48 } 49 50 }