本篇内容主要讲解“go开源Hugo站点怎么构建集结渲染”,感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷,实用性强。下面就让小编来带大家学习“go开源Hugo站点怎么构建集结渲染”吧!
Assemble
Assemble所做的事情很纯粹,那就是创建站点页面实例 - pageState。 因为支持多站点,contentMaps有多个。 所以Assemble不仅要创建pageState,还需要管理好所有的pages,这就用到了PageMaps。
type pageMap struct {s *Site*contentMap}type pageMaps struct {workers *para.Workerspmaps []*pageMap}
实际上pageMap就是由contentMap组合而来的。 而contentMap中的组成树的结点就是contentNode。
正好,每个contentNode又对应一个pageState。
type contentNode struct {p *pageState// Set if source is a file.// We will soon get other sources.fi hugofs.FileMetaInfo// The source path. Unix slashes. No leading slash.path string...}
所以Assemble不仅要为前面Process处理过生成的contentNode创建pageState,还要补齐一些缺失的contentNode,如Section。
PageState
可以看出,Assemble的重点就是组建PageState,那她到底长啥样:
type pageState struct {// This slice will be of same length as the number of global slice of output// formats (for all sites).pageOutputs []*pageOutput// This will be shifted out when we start to render a new output format.*pageOutput// Common for all output formats.*pageCommon...}
从注解中可以看出普通信息将由pageCommon提供,而输出信息则由pageOutput提供。 比较特殊的是pageOutputs,是pageOutput的数组。 在 基础架构中,对这一点有作分析。 这要归因于Hugo的多站点渲染策略 - 允许在不同的站点中重用其它站点的页面。
// hugo-playground/hugolib/page__new.go// line 97// Prepare output formats for all sites.// We do this even if this page does not get rendered on// its own. It may be referenced via .Site.GetPage and// it will then need an output format.ps.pageOutputs = make([]*pageOutput, len(ps.s.h.renderFormats))
那在Assemble中Hugo是如何组织pageState实例的呢?
从上图中,可以看出Assemble阶段主要是新建pageState。 其中pageOutput在这一阶段只是一个占位符,空的nopPageOutput。 pageCommon则是在这一阶段给赋予了很多的信息,像meta相关的信息,及各种细节信息的providers。
动手实践 - Show Me the Code of Create a PageState
package mainimport ("fmt""html/template")func main() {outputFormats := createOutputFormats()renderFormats := initRenderFormats(outputFormats)s := &site{outputFormats: outputFormats,renderFormats: renderFormats,}ps := &pageState{pageOutputs: nil,pageOutput: nil,pageCommon: &pageCommon{m: &pageMeta{kind: KindPage}},}ps.init(s)// prepareps.pageOutput = ps.pageOutputs[0]// renderfmt.Println(ps.targetPaths().TargetFilename)fmt.Println(ps.Content())fmt.Println(ps.m.kind)}type site struct {outputFormats map[string]FormatsrenderFormats Formats}type pageState struct {// This slice will be of same length as the number of global slice of output// formats (for all sites).pageOutputs []*pageOutput// This will be shifted out when we start to render a new output format.*pageOutput// Common for all output formats.*pageCommon}func (p *pageState) init(s *site) {pp := newPagePaths(s)p.pageOutputs = make([]*pageOutput, len(s.renderFormats))for i, f := range s.renderFormats {ft, found := pp.targetPaths[f.Name]if !found {panic("target path not found")}providers := struct{ targetPather }{ft}po := &pageOutput{f: f,pagePerOutputProviders: providers,ContentProvider: nil,}contentProvider := newPageContentOutput(po)po.ContentProvider = contentProviderp.pageOutputs[i] = po}}func newPageContentOutput(po *pageOutput) *pageContentOutput {cp := &pageContentOutput{f: po.f,}initContent := func() {cp.content = template.HTML("<p>hello content</p>")}cp.initMain = func() {initContent()}return cp}func newPagePaths(s *site) pagePaths {outputFormats := s.renderFormatstargets := make(map[string]targetPathsHolder)for _, f := range outputFormats {target := "/" + "blog" + "/" + f.BaseName +"." + f.MediaType.SubTypepaths := TargetPaths{TargetFilename: target,}targets[f.Name] = targetPathsHolder{paths: paths,}}return pagePaths{targetPaths: targets,}}type pagePaths struct {targetPaths map[string]targetPathsHolder}type targetPathsHolder struct {paths TargetPaths}func (t targetPathsHolder) targetPaths() TargetPaths {return t.paths}type pageOutput struct {f Format// These interface provides the functionality that is specific for this// output format.pagePerOutputProvidersContentProvider// May be nil.cp *pageContentOutput}// pageContentOutput represents the Page content for a given output format.type pageContentOutput struct {f FormatinitMain func()content template.HTML}func (p *pageContentOutput) Content() any {p.initMain()return p.content}// these will be shifted out when rendering a given output format.type pagePerOutputProviders interface {targetPather}type targetPather interface {targetPaths() TargetPaths}type TargetPaths struct {// Where to store the file on disk relative to the publish dir. OS slashes.TargetFilename string}type ContentProvider interface {Content() any}type pageCommon struct {m *pageMeta}type pageMeta struct {// kind is the discriminator that identifies the different page types// in the different page collections. This can, as an example, be used// to to filter regular pages, find sections etc.// Kind will, for the pages available to the templates, be one of:// page, home, section, taxonomy and term.// It is of string type to make it easy to reason about in// the templates.kind string}func initRenderFormats(outputFormats map[string]Formats) Formats {return outputFormats[KindPage]}func createOutputFormats() map[string]Formats {m := map[string]Formats{KindPage: {HTMLFormat},}return m}const (KindPage = "page")var HTMLType = newMediaType("text", "html")// HTMLFormat An ordered list of built-in output formats.var HTMLFormat = Format{Name: "HTML",MediaType: HTMLType,BaseName: "index",}func newMediaType(main, sub string) Type {t := Type{MainType: main,SubType: sub,Delimiter: "."}return t}type Type struct {MainType string `json:"mainType"` // i.e. textSubType string `json:"subType"` // i.e. htmlDelimiter string `json:"delimiter"` // e.g. "."}type Format struct {// The Name is used as an identifier. Internal output formats (i.e. HTML and RSS)// can be overridden by providing a new definition for those types.Name string `json:"name"`MediaType Type `json:"-"`// The base output file name used when not using "ugly URLs", defaults to "index".BaseName string `json:"baseName"`}type Formats []Format
输出结果:
/blog/index.html<p>hello content</p>pageProgram exited.
PageState线上可直接运行版本
Render
基础信息是由pageCommon提供了,那渲染过程中的输出由谁提供呢?
没错,轮到pageOutput了:
可以看到,在render阶段,pageState的pageOutput得到了最终的处理,为发布做准备了。 为了发布,最重的信息是发布什么,以及发布到哪里去。 这些信息都在pageOutput中,其中ContentProvider是提供发布内容的,而targetPathsProvider则是提供发布地址信息的。 其中地址信息主要来源于PagePath,这又和站点的RenderFormats和OutputFormats相关,哪下图所示:
其中OutputFormats, RenderFormats及PageOutput之间的关系有在 基础架构中有详细提到,这里就不再赘述。
// We create a pageOutput for every output format combination, even if this// particular page isn't configured to be rendered to that format.type pageOutput struct {...// These interface provides the functionality that is specific for this// output format.pagePerOutputProviderspage.ContentProviderpage.TableOfContentsProviderpage.PageRenderProvider// May be nil.cp *pageContentOutput}
其中pageContentOutput正是实现了ContentProvider接口的实例。 其中有包含markdown文件原始信息的workContent字段,以及包含处理过后的内容content字段。 如Hugo Shortcode特性。 就是在这里经过contentToRender方法将原始信息进行处理,而最终实现的。
动手实践 - Show Me the Code of Publish
package mainimport ("bytes""fmt""io""os""path/filepath")// publisher needs to know:// 1: what to publish// 2: where to publishfunc main() {// 1// src is template executed result// it is the source that we need to publish// take a look at template executor example// https://c.sunwei.xyz/template-executor.htmlsrc := &bytes.Buffer{}src.Write([]byte("template executed result"))b := &bytes.Buffer{}transformers := createTransformerChain()if err := transformers.Apply(b, src); err != nil {fmt.Println(err)return}dir, _ := os.MkdirTemp("", "hugo")defer os.RemoveAll(dir)// 2// targetPath is from pageState// this is where we need to publish// take a look at page state example// https://c.sunwei.xyz/page-state.htmltargetPath := filepath.Join(dir, "index.html")if err := os.WriteFile(targetPath,bytes.TrimSuffix(b.Bytes(), []byte("\n")),os.ModePerm); err != nil {panic(err)}fmt.Println("1. what to publish: ", string(b.Bytes()))fmt.Println("2. where to publish: ", dir)}func (c *Chain) Apply(to io.Writer, from io.Reader) error {fb := &bytes.Buffer{}if _, err := fb.ReadFrom(from); err != nil {return err}tb := &bytes.Buffer{}ftb := &fromToBuffer{from: fb, to: tb}for i, tr := range *c {if i > 0 {panic("switch from/to and reset to")}if err := tr(ftb); err != nil {continue}}_, err := ftb.to.WriteTo(to)return err}func createTransformerChain() Chain {transformers := NewEmpty()transformers = append(transformers, func(ft FromTo) error {content := ft.From().Bytes()w := ft.To()tc := bytes.Replace(content,[]byte("result"), []byte("transferred result"), 1)_, _ = w.Write(tc)return nil})return transformers}// Chain is an ordered processing chain. The next transform operation will// receive the output from the previous.type Chain []Transformer// Transformer is the func that needs to be implemented by a transformation step.type Transformer func(ft FromTo) error// FromTo is sent to each transformation step in the chain.type FromTo interface {From() BytesReaderTo() io.Writer}// BytesReader wraps the Bytes method, usually implemented by bytes.Buffer, and an// io.Reader.type BytesReader interface {// Bytes The slice given by Bytes is valid for use only until the next buffer modification.// That is, if you want to use this value outside of the current transformer step,// you need to take a copy.Bytes() []byteio.Reader}// NewEmpty creates a new slice of transformers with a capacity of 20.func NewEmpty() Chain {return make(Chain, 0, 2)}// Implements contentTransformer// Content is read from the from-buffer and rewritten to to the to-buffer.type fromToBuffer struct {from *bytes.Bufferto *bytes.Buffer}func (ft fromToBuffer) From() BytesReader {return ft.from}func (ft fromToBuffer) To() io.Writer {return ft.to}
输出结果:
what to publish: template executed transferred result
2. where to publish: /tmp/hugo2834984546
Program exited.
Publish线上可直接运行版本
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