hugo/transform/metainject/hugogenerator.go
Bjørn Erik Pedersen 789ef8c639
Add support for minification of final output
Hugo Pipes added minification support for resources fetched via ´resources.Get` and similar.

This also adds support for minification of the final output for supported output formats: HTML, XML, SVG, CSS, JavaScript, JSON.

To enable, run Hugo with the `--minify` flag:

```bash
hugo --minify
```

This commit is also a major spring cleaning of the `transform` package to allow the new minification step fit into that processing chain.

Fixes #1251
2018-08-06 19:58:41 +02:00

54 lines
1.7 KiB
Go

// 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
}