mirror of
https://github.com/avelino/awesome-go.git
synced 2024-11-07 16:33:40 +00:00
366 lines
8.5 KiB
Go
366 lines
8.5 KiB
Go
// Package main contains code for generate static site.
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package main
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import (
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"bytes"
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"embed"
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"errors"
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"fmt"
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template2 "html/template"
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"net/url"
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"os"
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"path/filepath"
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"text/template"
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"github.com/avelino/awesome-go/pkg/markdown"
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cp "github.com/otiai10/copy"
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"github.com/PuerkitoBio/goquery"
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"github.com/avelino/awesome-go/pkg/slug"
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)
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// Link contains info about awesome url
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type Link struct {
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Title string
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URL string
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Description string
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}
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// Category describe link category
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type Category struct {
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Title string
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Slug string
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Description string
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Links []Link
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}
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// Source files
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const readmePath = "README.md"
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// This files should be copied 'as is' to outDir directory
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var staticFiles = []string{
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"tmpl/assets",
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"tmpl/robots.txt",
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}
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// Templates
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//go:embed tmpl/*.tmpl.html tmpl/*.tmpl.xml
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var tplFs embed.FS
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var tpl = template.Must(template.ParseFS(tplFs, "tmpl/*.tmpl.html", "tmpl/*.tmpl.xml"))
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// Output files
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const outDir = "out/" // NOTE: trailing slash is required
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var outIndexFile = filepath.Join(outDir, "index.html")
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var outSitemapFile = filepath.Join(outDir, "sitemap.xml")
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func main() {
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if err := buildStaticSite(); err != nil {
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panic(err)
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}
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}
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func buildStaticSite() error {
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if err := dropCreateDir(outDir); err != nil {
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return fmt.Errorf("drop-create out dir: %w", err)
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}
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if err := renderIndex(readmePath, outIndexFile); err != nil {
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return fmt.Errorf("convert markdown to html: %w", err)
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}
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input, err := os.ReadFile(outIndexFile)
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if err != nil {
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return fmt.Errorf("read converted html: %w", err)
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}
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doc, err := goquery.NewDocumentFromReader(bytes.NewReader(input))
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if err != nil {
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return fmt.Errorf("create goquery instance: %w", err)
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}
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categories, err := extractCategories(doc)
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if err != nil {
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return fmt.Errorf("extract categories: %w", err)
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}
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if err := renderCategories(categories); err != nil {
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return fmt.Errorf("render categories: %w", err)
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}
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if err := rewriteLinksInIndex(doc, categories); err != nil {
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return fmt.Errorf("rewrite links in index: %w", err)
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}
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if err := renderSitemap(categories); err != nil {
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return fmt.Errorf("render sitemap: %w", err)
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}
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for _, srcFilename := range staticFiles {
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dstFilename := filepath.Join(outDir, filepath.Base(srcFilename))
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fmt.Printf("Copy static file: %s -> %s\n", srcFilename, dstFilename)
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if err := cp.Copy(srcFilename, dstFilename); err != nil {
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return fmt.Errorf("copy static file `%s` to `%s`: %w", srcFilename, dstFilename, err)
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}
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}
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return nil
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}
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// dropCreateDir drop and create output directory
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func dropCreateDir(dir string) error {
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if err := os.RemoveAll(dir); err != nil {
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return fmt.Errorf("remove dir: %w", err)
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}
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if err := mkdirAll(dir); err != nil {
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return fmt.Errorf("create dir: %w", err)
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}
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return nil
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}
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func mkdirAll(path string) error {
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_, err := os.Stat(path)
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// directory is exists
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if err == nil {
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return nil
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}
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// unexpected error
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if !os.IsNotExist(err) {
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return fmt.Errorf("unexpected result of dir stat: %w", err)
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}
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// directory is not exists
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if err := os.MkdirAll(path, 0755); err != nil {
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return fmt.Errorf("midirAll: %w", err)
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}
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return nil
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}
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func renderCategories(categories map[string]Category) error {
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for _, category := range categories {
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categoryDir := filepath.Join(outDir, category.Slug)
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if err := mkdirAll(categoryDir); err != nil {
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return fmt.Errorf("create category dir `%s`: %w", categoryDir, err)
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}
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// FIXME: embed templates
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categoryIndexFilename := filepath.Join(categoryDir, "index.html")
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fmt.Printf("Write category Index file: %s\n", categoryIndexFilename)
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buf := bytes.NewBuffer(nil)
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if err := tpl.Lookup("category-index.tmpl.html").Execute(buf, category); err != nil {
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return fmt.Errorf("render category `%s`: %w", categoryDir, err)
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}
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// Sanitize HTML. This is not necessary, but allows to have content
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// of all html files in same style.
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{
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doc, err := goquery.NewDocumentFromReader(buf)
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if err != nil {
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return fmt.Errorf("create goquery instance for `%s`: %w", categoryDir, err)
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}
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html, err := doc.Html()
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if err != nil {
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return fmt.Errorf("render goquery html for `%s`: %w", categoryDir, err)
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}
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if err := os.WriteFile(categoryIndexFilename, []byte(html), 0644); err != nil {
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return fmt.Errorf("write category file `%s`: %w", categoryDir, err)
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}
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}
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}
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return nil
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}
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func renderSitemap(categories map[string]Category) error {
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f, err := os.Create(outSitemapFile)
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if err != nil {
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return fmt.Errorf("create sitemap file `%s`: %w", outSitemapFile, err)
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}
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fmt.Printf("Render Sitemap to: %s\n", outSitemapFile)
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if err := tpl.Lookup("sitemap.tmpl.xml").Execute(f, categories); err != nil {
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return fmt.Errorf("render sitemap: %w", err)
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}
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return nil
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}
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func extractCategories(doc *goquery.Document) (map[string]Category, error) {
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categories := make(map[string]Category)
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var rootErr error
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doc.
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Find("body #contents").
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NextFiltered("ul").
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Find("ul").
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EachWithBreak(func(_ int, selUl *goquery.Selection) bool {
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if rootErr != nil {
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return false
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}
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selUl.
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Find("li a").
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EachWithBreak(func(_ int, s *goquery.Selection) bool {
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selector, exists := s.Attr("href")
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if !exists {
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return true
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}
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category, err := extractCategory(doc, selector)
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if err != nil {
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rootErr = fmt.Errorf("extract category: %w", err)
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return false
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}
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categories[selector] = *category
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return true
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})
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return true
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})
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if rootErr != nil {
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return nil, fmt.Errorf("extract categories: %w", rootErr)
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}
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return categories, nil
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}
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func extractCategory(doc *goquery.Document, selector string) (*Category, error) {
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var category Category
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var err error
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doc.Find(selector).EachWithBreak(func(_ int, selCatHeader *goquery.Selection) bool {
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selDescr := selCatHeader.NextFiltered("p")
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// FIXME: bug. this would select links from all neighboring
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// sub-categories until the next category. To prevent this we should
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// find only first ul
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ul := selCatHeader.NextFilteredUntil("ul", "h2")
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var links []Link
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ul.Find("li").Each(func(_ int, selLi *goquery.Selection) {
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selLink := selLi.Find("a")
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url, _ := selLink.Attr("href")
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link := Link{
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Title: selLink.Text(),
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// FIXME(kazhuravlev): Title contains only title but
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// description contains Title + description
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Description: selLi.Text(),
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URL: url,
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}
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links = append(links, link)
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})
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// FIXME: In this case we would have an empty category in main index.html with link to 404 page.
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if len(links) == 0 {
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err = errors.New("category does not contain links")
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return false
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}
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category = Category{
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Slug: slug.Generate(selCatHeader.Text()),
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Title: selCatHeader.Text(),
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Description: selDescr.Text(),
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Links: links,
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}
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return true
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})
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if err != nil {
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return nil, fmt.Errorf("build a category: %w", err)
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}
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return &category, nil
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}
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func rewriteLinksInIndex(doc *goquery.Document, categories map[string]Category) error {
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var iterErr error
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doc.
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Find("body #content ul li ul li a").
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EachWithBreak(func(_ int, s *goquery.Selection) bool {
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href, hrefExists := s.Attr("href")
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if !hrefExists {
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// FIXME: looks like is an error. Tag `a` in our case always
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// should have `href` attr.
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return true
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}
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// do not replace links if no page has been created for it
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_, catExists := categories[href]
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if !catExists {
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return true
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}
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linkURL, err := url.Parse(href)
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if err != nil {
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iterErr = err
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return false
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}
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if linkURL.Fragment != "" && linkURL.Fragment != "contents" {
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s.SetAttr("href", linkURL.Fragment)
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}
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return true
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})
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if iterErr != nil {
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return iterErr
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}
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fmt.Printf("Rewrite links in Index file: %s\n", outIndexFile)
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resultHTML, err := doc.Html()
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if err != nil {
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return fmt.Errorf("render html: %w", err)
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}
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if err := os.WriteFile(outIndexFile, []byte(resultHTML), 0644); err != nil {
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return fmt.Errorf("rewrite index file: %w", err)
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}
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return nil
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}
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// renderIndex generate site html (index.html) from markdown file
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func renderIndex(srcFilename, outFilename string) error {
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input, err := os.ReadFile(srcFilename)
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if err != nil {
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return err
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}
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body, err := markdown.ToHTML(input)
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if err != nil {
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return err
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}
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f, err := os.Create(outFilename)
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if err != nil {
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return err
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}
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fmt.Printf("Write Index file: %s\n", outIndexFile)
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data := map[string]interface{}{
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"Body": template2.HTML(body),
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}
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if err := tpl.Lookup("index.tmpl.html").Execute(f, data); err != nil {
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return err
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}
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if err := f.Close(); err != nil {
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return fmt.Errorf("close index file: %w", err)
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}
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return nil
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}
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