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// 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 minifiers contains minifiers mapped to MIME types. This package is used
// in both the resource transformation, i.e. resources.Minify, and in the publishing
// chain.
package minifiers
import (
"io"
"regexp"
"github.com/gohugoio/hugo/output"
"github.com/gohugoio/hugo/transform"
"github.com/gohugoio/hugo/media"
"github.com/tdewolff/minify/v2"
"github.com/tdewolff/minify/v2/css"
"github.com/tdewolff/minify/v2/html"
"github.com/tdewolff/minify/v2/js"
"github.com/tdewolff/minify/v2/json"
"github.com/tdewolff/minify/v2/svg"
"github.com/tdewolff/minify/v2/xml"
)
// Client wraps a minifier.
type Client struct {
m *minify.M
}
// Transformer returns a func that can be used in the transformer publishing chain.
// TODO(bep) minify config etc
func (m Client) Transformer(mediatype media.Type) transform.Transformer {
_, params, min := m.m.Match(mediatype.Type())
if min == nil {
// No minifier for this MIME type
return nil
}
return func(ft transform.FromTo) error {
// Note that the source io.Reader will already be buffered, but it implements
// the Bytes() method, which is recognized by the Minify library.
return min.Minify(m.m, ft.To(), ft.From(), params)
}
}
// Minify tries to minify the src into dst given a MIME type.
func (m Client) Minify(mediatype media.Type, dst io.Writer, src io.Reader) error {
return m.m.Minify(mediatype.Type(), dst, src)
}
// New creates a new Client with the provided MIME types as the mapping foundation.
// The HTML minifier is also registered for additional HTML types (AMP etc.) in the
// provided list of output formats.
func New(mediaTypes media.Types, outputFormats output.Formats) Client {
m := minify.New()
htmlMin := &html.Minifier{
KeepDocumentTags: true,
KeepConditionalComments: true,
KeepEndTags: true,
KeepDefaultAttrVals: true,
}
cssMin := &css.Minifier{
Precision: 0,
KeepCSS2: true,
}
// We use the Type definition of the media types defined in the site if found.
addMinifier(m, mediaTypes, "css", cssMin)
addMinifierFunc(m, mediaTypes, "js", js.Minify)
m.AddFuncRegexp(regexp.MustCompile("^(application|text)/(x-)?(java|ecma)script$"), js.Minify)
m.AddFuncRegexp(regexp.MustCompile(`^(application|text)/(x-|ld\+)?json$`), json.Minify)
addMinifierFunc(m, mediaTypes, "json", json.Minify)
addMinifierFunc(m, mediaTypes, "svg", svg.Minify)
addMinifierFunc(m, mediaTypes, "xml", xml.Minify)
// HTML
addMinifier(m, mediaTypes, "html", htmlMin)
for _, of := range outputFormats {
if of.IsHTML {
m.Add(of.MediaType.Type(), htmlMin)
}
}
return Client{m: m}
}
func addMinifier(m *minify.M, mt media.Types, suffix string, min minify.Minifier) {
types := mt.BySuffix(suffix)
for _, t := range types {
m.Add(t.Type(), min)
}
}
func addMinifierFunc(m *minify.M, mt media.Types, suffix string, min minify.MinifierFunc) {
types := mt.BySuffix(suffix)
for _, t := range types {
m.AddFunc(t.Type(), min)
}
}
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