diff options
Diffstat (limited to 'transform/metainject/hugogenerator.go')
-rw-r--r-- | transform/metainject/hugogenerator.go | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/transform/metainject/hugogenerator.go b/transform/metainject/hugogenerator.go new file mode 100644 index 000000000..513b21228 --- /dev/null +++ b/transform/metainject/hugogenerator.go @@ -0,0 +1,54 @@ +// 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 metainject + +import ( + "bytes" + "fmt" + "regexp" + + "github.com/gohugoio/hugo/helpers" + "github.com/gohugoio/hugo/transform" +) + +var metaTagsCheck = regexp.MustCompile(`(?i)<meta\s+name=['|"]?generator['|"]?`) +var hugoGeneratorTag = fmt.Sprintf(`<meta name="generator" content="Hugo %s" />`, helpers.CurrentHugoVersion) + +// HugoGenerator injects a meta generator tag for Hugo if none present. +func HugoGenerator(ft transform.FromTo) error { + b := ft.From().Bytes() + if metaTagsCheck.Match(b) { + if _, err := ft.To().Write(b); err != nil { + helpers.DistinctWarnLog.Println("Failed to inject Hugo generator tag:", err) + } + return nil + } + + head := "<head>" + replace := []byte(fmt.Sprintf("%s\n\t%s", head, hugoGeneratorTag)) + newcontent := bytes.Replace(b, []byte(head), replace, 1) + + if len(newcontent) == len(b) { + head := "<HEAD>" + replace := []byte(fmt.Sprintf("%s\n\t%s", head, hugoGeneratorTag)) + newcontent = bytes.Replace(b, []byte(head), replace, 1) + } + + if _, err := ft.To().Write(newcontent); err != nil { + helpers.DistinctWarnLog.Println("Failed to inject Hugo generator tag:", err) + } + + return nil + +} |