github.com/linchen2chris/hugo@v0.0.0-20230307053224-cec209389705/resources/resource_transformers/minifier/minify.go (about)

     1  // Copyright 2018 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 minifier
    15  
    16  import (
    17  	"github.com/gohugoio/hugo/minifiers"
    18  	"github.com/gohugoio/hugo/resources"
    19  	"github.com/gohugoio/hugo/resources/internal"
    20  	"github.com/gohugoio/hugo/resources/resource"
    21  )
    22  
    23  // Client for minification of Resource objects. Supported minifiers are:
    24  // css, html, js, json, svg and xml.
    25  type Client struct {
    26  	rs *resources.Spec
    27  	m  minifiers.Client
    28  }
    29  
    30  // New creates a new Client given a specification. Note that it is the media types
    31  // configured for the site that is used to match files to the correct minifier.
    32  func New(rs *resources.Spec) (*Client, error) {
    33  	m, err := minifiers.New(rs.MediaTypes, rs.OutputFormats, rs.Cfg)
    34  	if err != nil {
    35  		return nil, err
    36  	}
    37  	return &Client{rs: rs, m: m}, nil
    38  }
    39  
    40  type minifyTransformation struct {
    41  	rs *resources.Spec
    42  	m  minifiers.Client
    43  }
    44  
    45  func (t *minifyTransformation) Key() internal.ResourceTransformationKey {
    46  	return internal.NewResourceTransformationKey("minify")
    47  }
    48  
    49  func (t *minifyTransformation) Transform(ctx *resources.ResourceTransformationCtx) error {
    50  	ctx.AddOutPathIdentifier(".min")
    51  	return t.m.Minify(ctx.InMediaType, ctx.To, ctx.From)
    52  }
    53  
    54  func (c *Client) Minify(res resources.ResourceTransformer) (resource.Resource, error) {
    55  	return res.Transform(&minifyTransformation{
    56  		rs: c.rs,
    57  		m:  c.m,
    58  	})
    59  }