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// Copyright 2020 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 publisher
import (
"errors"
"fmt"
"io"
"net/url"
"sync/atomic"
"github.com/gohugoio/hugo/resources"
"github.com/gohugoio/hugo/media"
"github.com/gohugoio/hugo/minifiers"
bp "github.com/gohugoio/hugo/bufferpool"
"github.com/gohugoio/hugo/helpers"
"github.com/spf13/afero"
"github.com/gohugoio/hugo/output"
"github.com/gohugoio/hugo/transform"
"github.com/gohugoio/hugo/transform/livereloadinject"
"github.com/gohugoio/hugo/transform/metainject"
"github.com/gohugoio/hugo/transform/urlreplacers"
)
// Descriptor describes the needed publishing chain for an item.
type Descriptor struct {
// The content to publish.
Src io.Reader
// The OutputFormat of the this content.
OutputFormat output.Format
// Where to publish this content. This is a filesystem-relative path.
TargetPath string
// Counter for the end build summary.
StatCounter *uint64
// Configuration that trigger pre-processing.
// LiveReload script will be injected if this is != nil
LiveReloadBaseURL *url.URL
// Enable to inject the Hugo generated tag in the header. Is currently only
// injected on the home page for HTML type of output formats.
AddHugoGeneratorTag bool
// If set, will replace all relative URLs with this one.
AbsURLPath string
// Enable to minify the output using the OutputFormat defined above to
// pick the correct minifier configuration.
Minify bool
}
// DestinationPublisher is the default and currently only publisher in Hugo. This
// publisher prepares and publishes an item to the defined destination, e.g. /public.
type DestinationPublisher struct {
fs afero.Fs
min minifiers.Client
htmlElementsCollector *htmlElementsCollector
}
// NewDestinationPublisher creates a new DestinationPublisher.
func NewDestinationPublisher(rs *resources.Spec, outputFormats output.Formats, mediaTypes media.Types) (pub DestinationPublisher, err error) {
fs := rs.BaseFs.PublishFs
cfg := rs.Cfg
var classCollector *htmlElementsCollector
if rs.BuildConfig().BuildStats.Enabled() {
classCollector = newHTMLElementsCollector(rs.BuildConfig().BuildStats)
}
pub = DestinationPublisher{fs: fs, htmlElementsCollector: classCollector}
pub.min, err = minifiers.New(mediaTypes, outputFormats, cfg)
return
}
// Publish applies any relevant transformations and writes the file
// to its destination, e.g. /public.
func (p DestinationPublisher) Publish(d Descriptor) error {
if d.TargetPath == "" {
return errors.New("Publish: must provide a TargetPath")
}
src := d.Src
transformers := p.createTransformerChain(d)
if len(transformers) != 0 {
b := bp.GetBuffer()
defer bp.PutBuffer(b)
if err := transformers.Apply(b, d.Src); err != nil {
return fmt.Errorf("failed to process %q: %w", d.TargetPath, err)
}
// This is now what we write to disk.
src = b
}
f, err := helpers.OpenFileForWriting(p.fs, d.TargetPath)
if err != nil {
return err
}
defer f.Close()
var w io.Writer = f
if p.htmlElementsCollector != nil && d.OutputFormat.IsHTML {
w = io.MultiWriter(w, newHTMLElementsCollectorWriter(p.htmlElementsCollector))
}
_, err = io.Copy(w, src)
if err == nil && d.StatCounter != nil {
atomic.AddUint64(d.StatCounter, uint64(1))
}
return err
}
func (p DestinationPublisher) PublishStats() PublishStats {
if p.htmlElementsCollector == nil {
return PublishStats{}
}
return PublishStats{
HTMLElements: p.htmlElementsCollector.getHTMLElements(),
}
}
type PublishStats struct {
HTMLElements HTMLElements `json:"htmlElements"`
}
// Publisher publishes a result file.
type Publisher interface {
Publish(d Descriptor) error
PublishStats() PublishStats
}
// XML transformer := transform.New(urlreplacers.NewAbsURLInXMLTransformer(path))
func (p DestinationPublisher) createTransformerChain(f Descriptor) transform.Chain {
transformers := transform.NewEmpty()
isHTML := f.OutputFormat.IsHTML
if f.AbsURLPath != "" {
if isHTML {
transformers = append(transformers, urlreplacers.NewAbsURLTransformer(f.AbsURLPath))
} else {
// Assume XML.
transformers = append(transformers, urlreplacers.NewAbsURLInXMLTransformer(f.AbsURLPath))
}
}
if isHTML {
if f.LiveReloadBaseURL != nil {
transformers = append(transformers, livereloadinject.New(f.LiveReloadBaseURL))
}
// This is only injected on the home page.
if f.AddHugoGeneratorTag {
transformers = append(transformers, metainject.HugoGenerator)
}
}
if p.min.MinifyOutput {
minifyTransformer := p.min.Transformer(f.OutputFormat.MediaType)
if minifyTransformer != nil {
transformers = append(transformers, minifyTransformer)
}
}
return transformers
}
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