From 63d18d068d3b01041a4d1e73cf5eb78c6d3eac27 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C5=99emysl=20Eric=20Janouch?= <p@janouch.name>
Date: Tue, 22 Jun 2021 00:59:13 +0200
Subject: [PATCH] hswg: actually use templates for output files

---
 hswg/main.go | 78 ++++++++++++++++++++++++++--------------------------
 1 file changed, 39 insertions(+), 39 deletions(-)

diff --git a/hswg/main.go b/hswg/main.go
index 82b3014..caae1f1 100644
--- a/hswg/main.go
+++ b/hswg/main.go
@@ -134,17 +134,18 @@ func Render(r io.Reader, config configuration.Configuration) (
 
 // Entry contains all context information about a single page.
 type Entry struct {
-	PathSource      string    // path to source AsciiDoc
-	PathDestination string    // path to destination HTML
-	mtime           time.Time // modification time
-	Metadata        Metadata  // metadata
-	document        []byte    // inner document with expanded LinkWords
-	backlinks       []string  // what documents link back here
+	Metadata                      // metadata
+	PathSource      string        // path to source AsciiDoc
+	PathDestination string        // path to destination HTML
+	mtime           time.Time     // modification time
+	Content         template.HTML // inner document with expanded LinkWords
+	backlinks       []string      // what documents link back here
+	Backlinks       []template.HTML
 }
 
 // Published returns the date when the entry was published, or nil if unknown.
 func (e *Entry) Published() *time.Time {
-	if d, _, err := e.Metadata.Attributes.GetAsString("date"); err != nil {
+	if d, _, err := e.Attributes.GetAsString("date"); err != nil {
 		return nil
 	} else if t, err := time.Parse(time.RFC3339, d); err == nil {
 		return &t
@@ -178,7 +179,7 @@ var linkWordRE = regexp.MustCompile(`\b\p{Lu}\p{L}*\b`)
 func expand(m *map[string]*Entry, name string, chunk []byte) []byte {
 	return linkWordRE.ReplaceAllFunc(chunk, func(match []byte) []byte {
 		if link, ok := (*m)[string(match)]; ok && string(match) != name &&
-			!link.Metadata.IsDraft() {
+			!link.IsDraft() {
 			link.backlinks = append(link.backlinks, name)
 			return []byte(makeLink(m, string(match)))
 		}
@@ -213,6 +214,11 @@ func main() {
 		log.Fatalln(err)
 	}
 
+	t, err := template.New("page").Parse(string(header))
+	if err != nil {
+		log.Fatalln(err)
+	}
+
 	// Create a map from document names to their page entries.
 	entries := map[string]*Entry{}
 	for _, glob := range os.Args[2:] {
@@ -253,6 +259,11 @@ func main() {
 			log.Fatalln(err)
 		}
 
+		// Every page needs to have a title.
+		if e.Title == "" {
+			e.Title = name
+		}
+
 		// Expand LinkWords anywhere between <tags>.
 		// We want something like the inverse of Regexp.ReplaceAllStringFunc.
 		raw, last, expanded := html.Bytes(), 0, bytes.NewBuffer(nil)
@@ -262,45 +273,34 @@ func main() {
 			last = where[1]
 		}
 		_, _ = expanded.Write(expand(&entries, name, raw[last:]))
-		e.document = expanded.Bytes()
+		e.Content = template.HTML(expanded.String())
 	}
 
-	// TODO(p): These should be run through html/template.
-	for name, e := range entries {
+	for _, e := range entries {
+		sort.Strings(e.backlinks)
+
+		last, uniq := "", []string{}
+		for _, name := range e.backlinks {
+			if name != last {
+				uniq = append(uniq, name)
+			}
+			last = name
+		}
+		e.backlinks = uniq
+	}
+
+	for _, e := range entries {
 		f, err := os.Create(e.PathDestination)
 		if err != nil {
 			log.Fatalln(err)
 		}
-
-		_, _ = f.Write(header)
-
-		title := e.Metadata.Title
-		if title == "" {
-			title = name
-		}
-
-		_, _ = f.WriteString(fmt.Sprintf("<title>%s</title>\n", title))
-		_, _ = f.WriteString(fmt.Sprintf("<h1>%s</h1>\n", title))
-
-		sort.Strings(e.backlinks)
-
-		backlinks, last := []string{}, ""
 		for _, name := range e.backlinks {
-			if name != last {
-				backlinks = append(backlinks, makeLink(&entries, name))
-			}
-			last = name
+			e.Backlinks = append(e.Backlinks,
+				template.HTML(makeLink(&entries, name)))
 		}
-
-		if len(backlinks) > 0 {
-			_, _ = f.WriteString(fmt.Sprintf("<p id=links>Links here: %s</p>\n",
-				strings.Join(backlinks, ", ")))
+		if err = t.Execute(f, e); err != nil {
+			log.Fatalln(err)
 		}
-
-		_, _ = f.Write(e.document)
-		_, _ = f.WriteString(fmt.Sprintf("<p id=footer>Last updated: %s"+
-			" &mdash; <a href='%s'>Source</p>\n",
-			e.Metadata.LastUpdated, e.PathSource))
 	}
 
 	// Reorder entries reversely, primarily by date, secondarily by filename.
@@ -334,7 +334,7 @@ func main() {
 	}
 
 	// TODO(p): Splitting content to categories would be nice.
-	t, err := template.New("-").Parse(string(input))
+	t, err = template.New("-").Parse(string(input))
 	if err = t.Execute(os.Stdout, ordered); err != nil {
 		log.Fatalln(err)
 	}