From 750f2139f574dc98de0be185d6be05101630ef41 Mon Sep 17 00:00:00 2001
From: Přemysl Eric Janouch <p@janouch.name>
Date: Mon, 21 Sep 2020 17:45:18 +0200
Subject: hswg: extract attributes from documents

---
 hswg/main.go | 45 +++++++++++++++++++++++++++++++--------------
 1 file changed, 31 insertions(+), 14 deletions(-)

diff --git a/hswg/main.go b/hswg/main.go
index 74cbad7..0a92797 100644
--- a/hswg/main.go
+++ b/hswg/main.go
@@ -18,9 +18,12 @@ import (
 	"unicode"
 	"unicode/utf8"
 
-	"github.com/bytesparadise/libasciidoc"
 	"github.com/bytesparadise/libasciidoc/pkg/configuration"
+	"github.com/bytesparadise/libasciidoc/pkg/parser"
+	"github.com/bytesparadise/libasciidoc/pkg/renderer"
+	"github.com/bytesparadise/libasciidoc/pkg/renderer/sgml/html5"
 	"github.com/bytesparadise/libasciidoc/pkg/types"
+	"github.com/bytesparadise/libasciidoc/pkg/validator"
 )
 
 // isTitle returns the title level if the lines seem to form a title,
@@ -68,14 +71,23 @@ func ConvertTitles(w *io.PipeWriter, input []byte) {
 	writeLine(w, last, nil)
 }
 
+// Metadata contains select metadata about a rendered document.
+type Metadata struct {
+	types.Metadata
+
+	// Note that this includes entries from the front-matter
+	// (see parser.ApplySubstitutions <- parser.ParseDocument).
+	Attributes types.Attributes
+}
+
 // Render converts an io.Reader with an AsciiDoc document to HTML. So long as
 // the file could be read at all, it will always return a non-empty document.
-func Render(doc io.Reader, config configuration.Configuration) (
-	html *bytes.Buffer, meta types.Metadata, err error) {
+func Render(r io.Reader, config configuration.Configuration) (
+	html *bytes.Buffer, meta Metadata, err error) {
 	html = bytes.NewBuffer(nil)
 
 	var input []byte
-	if input, err = ioutil.ReadAll(doc); err != nil {
+	if input, err = ioutil.ReadAll(r); err != nil {
 		return
 	}
 
@@ -88,7 +100,14 @@ func Render(doc io.Reader, config configuration.Configuration) (
 	// io.Copy(os.Stdout, pr)
 	// return
 
-	meta, err = libasciidoc.Convert(pr, html, config)
+	var doc types.Document
+	if doc, err = parser.ParseDocument(pr, config); err == nil {
+		for _, problem := range validator.Validate(&doc) {
+			fmt.Fprintln(os.Stderr, problem.Message)
+		}
+		ctx := renderer.NewContext(doc, config)
+		meta.Metadata, err = html5.Render(ctx, doc, html)
+	}
 	if err != nil {
 		// Fallback: output all the text sanitized for direct inclusion.
 		html.Reset()
@@ -100,16 +119,17 @@ func Render(doc io.Reader, config configuration.Configuration) (
 		}
 		_, _ = html.WriteString("</pre>")
 	}
+	meta.Attributes = doc.Attributes
 	return
 }
 
 // entry contains all context information about a single page.
 type entry struct {
-	path      string         // path
-	mtime     time.Time      // modification time
-	metadata  types.Metadata // metadata
-	document  []byte         // inner document with expanded LinkWords
-	backlinks []string       // what documents link back here
+	path      string    // path
+	mtime     time.Time // modification time
+	metadata  Metadata  // metadata
+	document  []byte    // inner document with expanded LinkWords
+	backlinks []string  // what documents link back here
 }
 
 var extRE = regexp.MustCompile(`\.[^/.]*$`)
@@ -143,9 +163,7 @@ func expand(m *map[string]*entry, name string, chunk []byte) []byte {
 }
 
 func singleFile() {
-	html, meta, err := Render(os.Stdin, configuration.NewConfiguration(
-		configuration.WithBackEnd("xhtml5"),
-	))
+	html, meta, err := Render(os.Stdin, configuration.NewConfiguration())
 	if err != nil {
 		log.Println(err)
 	} else if meta.Title != "" {
@@ -202,7 +220,6 @@ func main() {
 
 		var html *bytes.Buffer
 		if html, e.metadata, err = Render(f, configuration.NewConfiguration(
-			configuration.WithBackEnd("xhtml5"),
 			configuration.WithFilename(e.path),
 			configuration.WithLastUpdated(e.mtime),
 		)); err != nil {
-- 
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