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|
package main
import (
"bytes"
"encoding/xml"
"fmt"
"io"
"io/fs"
"log"
"log/slog"
"net/url"
"os"
"path"
"path/filepath"
"slices"
"strings"
"time"
"website/internal/atom"
"website/internal/config"
"github.com/BurntSushi/toml"
"github.com/PuerkitoBio/goquery"
"github.com/adrg/frontmatter"
"github.com/antchfx/xmlquery"
"github.com/antchfx/xpath"
mapset "github.com/deckarep/golang-set/v2"
iohelper "github.com/jf-tech/go-corelib/ios"
"github.com/pkg/errors"
"github.com/yuin/goldmark"
"github.com/yuin/goldmark/extension"
"github.com/yuin/goldmark/renderer/html"
)
type PostMatter struct {
Date time.Time `toml:"date"`
Description string `toml:"description"`
Title string `toml:"title"`
Taxonomies struct {
Tags []string `toml:"tags"`
} `toml:"taxonomies"`
}
type Post struct {
Input string
Output string
Basename string
URL string
Content string
PostMatter
}
type Tags mapset.Set[string]
func getPost(filename string) (*PostMatter, *[]byte, error) {
matter := PostMatter{}
content, err := os.Open(filename)
defer content.Close()
if err != nil {
return nil, nil, errors.WithMessagef(err, "could not open post %s", filename)
}
rest, err := frontmatter.MustParse(content, &matter)
if err != nil {
return nil, nil, errors.WithMessagef(err, "could not parse front matter of post %s", filename)
}
return &matter, &rest, nil
}
func readPosts(root string, inputDir string, outputDir string) ([]Post, Tags, error) {
tags := mapset.NewSet[string]()
posts := []Post{}
subdir := filepath.Join(root, inputDir)
files, err := os.ReadDir(subdir)
if err != nil {
return nil, nil, errors.WithMessagef(err, "could not read post directory %s", subdir)
}
outputReplacer := strings.NewReplacer(root, outputDir, ".md", "/index.html")
urlReplacer := strings.NewReplacer(root, "", ".md", "/")
markdown := goldmark.New(
goldmark.WithRendererOptions(
html.WithUnsafe(),
),
goldmark.WithExtensions(
extension.GFM,
extension.Footnote,
extension.Typographer,
),
)
for _, f := range files {
pathFromRoot := filepath.Join(subdir, f.Name())
if !f.IsDir() && path.Ext(pathFromRoot) == ".md" {
output := outputReplacer.Replace(pathFromRoot)
url := urlReplacer.Replace(pathFromRoot)
slog.Debug("reading post", "post", pathFromRoot)
matter, content, err := getPost(pathFromRoot)
if err != nil {
return nil, nil, err
}
for _, tag := range matter.Taxonomies.Tags {
tags.Add(strings.ToLower(tag))
}
var buf bytes.Buffer
slog.Debug("rendering markdown in post", "post", pathFromRoot)
if err := markdown.Convert(*content, &buf); err != nil {
return nil, nil, errors.WithMessage(err, "could not convert markdown content")
}
post := Post{
Input: pathFromRoot,
Output: output,
Basename: filepath.Base(url),
URL: url,
PostMatter: *matter,
Content: buf.String(),
}
posts = append(posts, post)
}
}
slices.SortFunc(posts, func(a, b Post) int {
return b.Date.Compare(a.Date)
})
return posts, tags, nil
}
func layout(filename string, config config.Config, pageTitle string) (*goquery.Document, error) {
html, err := os.Open(filename)
if err != nil {
return nil, err
}
defer html.Close()
css, err := os.ReadFile("templates/style.css")
if err != nil {
return nil, err
}
doc, err := goquery.NewDocumentFromReader(html)
if err != nil {
return nil, err
}
doc.Find("html").SetAttr("lang", config.DefaultLanguage)
doc.Find("head > link[rel=alternate]").SetAttr("title", config.Title)
doc.Find(".title").SetText(config.Title)
doc.Find("title").Add(".p-name").SetText(pageTitle)
doc.Find("head > style").SetHtml("\n" + string(css))
nav := doc.Find("nav")
navLink := doc.Find("nav a")
nav.Empty()
for _, link := range config.Menus["main"] {
nav.AppendSelection(navLink.Clone().SetAttr("href", link.URL).SetText(link.Name))
}
return doc, nil
}
func renderHTML(doc *goquery.Document) io.Reader {
r := bytes.NewBufferString("<!doctype html>\n")
// hello go? HTML 5 does not have self-closing tags
replacer := iohelper.NewBytesReplacingReader(r, []byte("/>"), []byte(" >"))
// TODO: return errors to main thread
go func() {
err := goquery.Render(r, doc.Children())
if err != nil {
slog.Error("error rendering html", "error", err)
}
}()
return replacer
}
func renderPost(post Post, config config.Config) (r io.Reader, err error) {
doc, err := layout("templates/post.html", config, post.PostMatter.Title)
if err != nil {
return nil, err
}
doc.Find(".title").AddClass("p-author h-card").SetAttr("rel", "author")
doc.Find(".h-entry .dt-published").
SetAttr("datetime", post.PostMatter.Date.UTC().Format(time.RFC3339)).
SetText(
post.PostMatter.Date.Format("2006-01-02"),
)
doc.Find(".h-entry .e-content").SetHtml(post.Content)
categories := doc.Find(".h-entry .p-categories")
tpl := categories.Find(".p-category").ParentsUntilSelection(categories)
tpl.Remove()
for _, tag := range post.Taxonomies.Tags {
cat := tpl.Clone()
cat.Find(".p-category").SetAttr("href", fmt.Sprintf("/tags/%s/", tag)).SetText("#" + tag)
categories.AppendSelection(cat)
}
return renderHTML(doc), nil
}
func renderTags(tags Tags, config config.Config) (io.Reader, error) {
doc, err := layout("templates/tags.html", config, config.Title)
if err != nil {
return nil, err
}
tagList := doc.Find(".tags")
tpl := doc.Find(".h-feed")
tpl.Remove()
for _, tag := range mapset.Sorted(tags) {
li := tpl.Clone()
li.Find("a").SetAttr("href", fmt.Sprintf("/tags/%s/", tag)).SetText("#" + tag)
tagList.AppendSelection(li)
}
return renderHTML(doc), nil
}
func renderListPage(tag string, config config.Config, posts []Post) (io.Reader, error) {
var title string
if len(tag) > 0 {
title = tag
} else {
title = config.Title
}
doc, err := layout("templates/list.html", config, title)
if err != nil {
return nil, err
}
feed := doc.Find(".h-feed")
tpl := feed.Find(".h-entry")
tpl.Remove()
doc.Find(".title").AddClass("p-author h-card").SetAttr("rel", "author")
if tag == "" {
doc.Find(".filter").Remove()
} else {
doc.Find(".filter").Find("h3").SetText("#" + tag)
}
for _, post := range posts {
entry := tpl.Clone()
entry.Find(".p-name").SetText(post.Title).SetAttr("href", post.URL)
entry.Find(".dt-published").
SetAttr("datetime", post.PostMatter.Date.UTC().Format(time.RFC3339)).
SetText(post.PostMatter.Date.Format("2006-01-02"))
feed.AppendSelection(entry)
}
return renderHTML(doc), nil
}
func renderHomepage(config config.Config, posts []Post) (io.Reader, error) {
_, index, err := getPost("content/_index.md")
if err != nil {
return nil, err
}
doc, err := layout("templates/homepage.html", config, config.Title)
if err != nil {
return nil, err
}
doc.Find("body").AddClass("h-card")
doc.Find(".title").AddClass("p-name u-url")
var buf bytes.Buffer
md := goldmark.New(goldmark.WithRendererOptions(html.WithUnsafe()))
if err := md.Convert(*index, &buf); err != nil {
return nil, err
}
doc.Find("#content").SetHtml(buf.String())
feed := doc.Find(".h-feed")
tpl := feed.Find(".h-entry")
tpl.Remove()
for _, post := range posts[0:3] {
entry := tpl.Clone()
entry.Find(".p-name").SetText(post.Title)
entry.Find(".u-url").SetAttr("href", post.URL)
entry.
Find(".dt-published").
SetAttr("datetime", post.PostMatter.Date.UTC().Format(time.RFC3339)).
SetText(post.PostMatter.Date.Format("2006-01-02"))
feed.AppendSelection(entry)
}
doc.Find(".u-email").
SetAttr("href", fmt.Sprintf("mailto:%s", config.Email)).
SetText(config.Email)
elsewhere := doc.Find(".elsewhere")
linkRelMe := elsewhere.Find(".u-url[rel=me]").ParentsUntil("ul")
linkRelMe.Remove()
for _, link := range config.Menus["me"] {
el := linkRelMe.Clone()
el.Find("a").SetAttr("href", link.URL).SetText(link.Name)
elsewhere.AppendSelection(el)
}
return renderHTML(doc), nil
}
func render404(config config.Config) (io.Reader, error) {
doc, err := layout("templates/404.html", config, "404 Not Found")
if err != nil {
return nil, err
}
return renderHTML(doc), nil
}
func renderFeed(title string, config config.Config, posts []Post, specific string) (io.Reader, error) {
reader, err := os.Open("templates/feed.xml")
if err != nil {
return nil, err
}
defer reader.Close()
doc, err := xmlquery.Parse(reader)
feed := doc.SelectElement("feed")
feed.SelectElement("title").FirstChild.Data = title
feed.SelectElement("link").SetAttr("href", config.BaseURL.String())
feed.SelectElement("id").FirstChild.Data = atom.MakeTagURI(config, specific)
datetime, err := posts[0].Date.UTC().MarshalText()
feed.SelectElement("updated").FirstChild.Data = string(datetime)
tpl := feed.SelectElement("entry")
xmlquery.RemoveFromTree(tpl)
for _, post := range posts {
fullURL, err := url.JoinPath(config.BaseURL.String(), post.URL)
if err != nil {
return nil, err
}
text, err := xml.MarshalIndent(&atom.FeedEntry{
Title: post.Title,
Link: atom.MakeLink(fullURL),
Id: atom.MakeTagURI(config, post.Basename),
Updated: post.Date.UTC(),
Summary: post.Description,
Author: config.Title,
Content: atom.FeedContent{
Content: post.Content,
Type: "html",
},
}, " ", " ")
if err != nil {
return nil, err
}
entry, err := xmlquery.ParseWithOptions(strings.NewReader(string(text)), xmlquery.ParserOptions{
Decoder: &xmlquery.DecoderOptions{
Strict: false,
AutoClose: xml.HTMLAutoClose,
Entity: xml.HTMLEntity,
},
})
if err != nil {
return nil, err
}
xmlquery.AddChild(feed, entry.SelectElement("entry"))
}
return strings.NewReader(doc.OutputXML(true)), nil
}
func renderFeedStyles() (io.Reader, error) {
reader, err := os.Open("templates/feed-styles.xsl")
if err != nil {
return nil, err
}
defer reader.Close()
nsMap := map[string]string{
"xsl": "http://www.w3.org/1999/XSL/Transform",
"atom": "http://www.w3.org/2005/Atom",
"xhtml": "http://www.w3.org/1999/xhtml",
}
doc, err := xmlquery.Parse(reader)
expr, err := xpath.CompileWithNS("//xhtml:style", nsMap)
if err != nil {
return nil, err
}
style := xmlquery.QuerySelector(doc, expr)
css, err := os.ReadFile("templates/style.css")
if err != nil {
return nil, err
}
xmlquery.AddChild(style, &xmlquery.Node{
Type: xmlquery.TextNode,
Data: string(css),
})
return strings.NewReader(doc.OutputXML(true)), nil
}
func mkdirp(dirs ...string) error {
return os.MkdirAll(path.Join(dirs...), 0755)
}
func outputToFile(output io.Reader, filename ...string) error {
file, err := os.OpenFile(path.Join(filename...), os.O_WRONLY|os.O_CREATE, 00644)
if err != nil {
return errors.WithMessage(err, "could not open output file")
}
defer file.Close()
if _, err := file.ReadFrom(output); err != nil {
return errors.WithMessage(err, "could not write output file")
}
return nil
}
func build() error {
config, err := config.GetConfig()
if err != nil {
return err
}
outDir := "public"
if err := mkdirp(outDir, "post"); err != nil {
return errors.WithMessage(err, "could not create post output directory")
}
slog.Debug("reading posts")
posts, tags, err := readPosts("content", "post", outDir)
if err != nil {
return err
}
for _, post := range posts {
if err := mkdirp(outDir, "post", post.Basename); err != nil {
return errors.WithMessage(err, "could not create directory for post")
}
slog.Debug("rendering post", "post", post.Basename)
output, err := renderPost(post, *config)
if err != nil {
return errors.WithMessagef(err, "could not render post %s", post.Input)
}
if err := outputToFile(output, post.Output); err != nil {
return err
}
}
if err := mkdirp(outDir, "tags"); err != nil {
return errors.WithMessage(err, "could not create directory for tags")
}
slog.Debug("rendering tags list")
output, err := renderTags(tags, *config)
if err != nil {
return errors.WithMessage(err, "could not render tags")
}
if err := outputToFile(output, outDir, "tags", "index.html"); err != nil {
return err
}
for _, tag := range tags.ToSlice() {
matchingPosts := []Post{}
for _, post := range posts {
if slices.Contains(post.Taxonomies.Tags, tag) {
matchingPosts = append(matchingPosts, post)
}
}
if err := mkdirp(outDir, "tags", tag); err != nil {
return errors.WithMessage(err, "could not create directory")
}
slog.Debug("rendering tags page", "tag", tag)
output, err := renderListPage(tag, *config, matchingPosts)
if err != nil {
return errors.WithMessage(err, "could not render tag page")
}
if err := outputToFile(output, outDir, "tags", tag, "index.html"); err != nil {
return err
}
slog.Debug("rendering tags feed", "tag", tag)
output, err = renderFeed(fmt.Sprintf("%s - %s", config.Title, tag), *config, matchingPosts, tag)
if err != nil {
return errors.WithMessage(err, "could not render tag feed page")
}
if err := outputToFile(output, outDir, "tags", tag, "atom.xml"); err != nil {
return err
}
}
slog.Debug("rendering list page")
listPage, err := renderListPage("", *config, posts)
if err != nil {
return errors.WithMessage(err, "could not render list page")
}
if err := outputToFile(listPage, outDir, "post", "index.html"); err != nil {
return err
}
slog.Debug("rendering feed")
feed, err := renderFeed(config.Title, *config, posts, "feed")
if err != nil {
return errors.WithMessage(err, "could not render feed")
}
if err := outputToFile(feed, outDir, "atom.xml"); err != nil {
return err
}
slog.Debug("rendering feed styles")
feedStyles, err := renderFeedStyles()
if err != nil {
return errors.WithMessage(err, "could not render feed styles")
}
if err := outputToFile(feedStyles, outDir, "feed-styles.xsl"); err != nil {
return err
}
slog.Debug("rendering homepage")
homePage, err := renderHomepage(*config, posts)
if err != nil {
return errors.WithMessage(err, "could not render homepage")
}
if err := outputToFile(homePage, outDir, "index.html"); err != nil {
return err
}
slog.Debug("rendering 404 page")
notFound, err := render404(*config)
if err != nil {
return errors.WithMessage(err, "could not render 404 page")
}
if err := outputToFile(notFound, outDir, "404.html"); err != nil {
return err
}
return nil
}
func main() {
if os.Getenv("DEBUG") != "" {
slog.SetLogLoggerLevel(slog.LevelDebug)
}
slog.Debug("starting build process")
_, err := os.Getwd()
if err != nil {
log.Panic(errors.Errorf("working directory does not exist: %v", err))
}
if err := build(); err != nil {
switch cause := errors.Cause(err).(type) {
case *fs.PathError:
slog.Info("pathError")
slog.Error(fmt.Sprintf("%s", err))
case toml.ParseError:
slog.Info("parseError")
slog.Error(fmt.Sprintf("%s", err))
default:
slog.Info("other")
slog.Error(fmt.Sprintf("cause:%+v", errors.Cause(cause)))
slog.Error(fmt.Sprintf("%+v", cause))
}
os.Exit(1)
}
slog.Debug("done")
}
|