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-rw-r--r--cmd/build/template.go275
1 files changed, 275 insertions, 0 deletions
diff --git a/cmd/build/template.go b/cmd/build/template.go
new file mode 100644
index 0000000..5ea1912
--- /dev/null
+++ b/cmd/build/template.go
@@ -0,0 +1,275 @@
+package main
+
+import (
+	"encoding/xml"
+	"fmt"
+	"io"
+	"log/slog"
+	"net/url"
+	"os"
+	"strings"
+	"time"
+	"website/internal/atom"
+	"website/internal/config"
+
+	"github.com/PuerkitoBio/goquery"
+	"github.com/a-h/htmlformat"
+	"github.com/antchfx/xmlquery"
+	"github.com/antchfx/xpath"
+	mapset "github.com/deckarep/golang-set/v2"
+	"golang.org/x/net/html"
+)
+
+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 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")
+
+	html, err := renderMarkdown(index)
+	doc.Find("#content").SetHtml(html)
+
+	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 renderHTML(doc *goquery.Document) io.Reader {
+	r, w := io.Pipe()
+
+	// TODO: return errors to main thread
+	go func() {
+		w.Write([]byte("<!doctype html>\n"))
+		err := htmlformat.Nodes(w, []*html.Node{doc.Children().Get(0)})
+		if err != nil {
+			slog.Error("error rendering html", "error", err)
+			w.CloseWithError(err)
+			return
+		}
+		defer w.Close()
+	}()
+	return r
+}
generated by cgit-pink 1.4.1 (git 2.36.1) at 2024-05-20 03:24:11 +0000