Make build.writeStats a struct

So you can do

```toml
[build.writeStats]
  tags = true
  classes = true
  ids = false
```

Fixes #11191

publisher/htmlElementsCollector.go

@@ -24,6 +24,7 @@ import (
 
 	"golang.org/x/net/html"
 
+	"github.com/gohugoio/hugo/config"
 	"github.com/gohugoio/hugo/helpers"
 )
 
@@ -46,8 +47,9 @@ var (
 	}
 )
 
-func newHTMLElementsCollector() *htmlElementsCollector {
+func newHTMLElementsCollector(conf config.WriteStats) *htmlElementsCollector {
 	return &htmlElementsCollector{
+		conf:       conf,
 		elementSet: make(map[string]bool),
 	}
 }
@@ -93,6 +95,8 @@ type htmlElement struct {
 }
 
 type htmlElementsCollector struct {
+	conf config.WriteStats
+
 	// Contains the raw HTML string. We will get the same element
 	// several times, and want to avoid costly reparsing when this
 	// is used for aggregated data only.
@@ -113,7 +117,9 @@ func (c *htmlElementsCollector) getHTMLElements() HTMLElements {
 	for _, el := range c.elements {
 		classes = append(classes, el.Classes...)
 		ids = append(ids, el.IDs...)
-		tags = append(tags, el.Tag)
+		if c.conf.Tags {
+			tags = append(tags, el.Tag)
+		}
 	}
 
 	classes = helpers.UniqueStringsSorted(classes)
@@ -246,7 +252,7 @@ func (w *htmlElementsCollectorWriter) lexElementInside(resolve htmlCollectorStat
 			}
 
 			// Parse each collected element.
-			el, err := parseHTMLElement(s)
+			el, err := w.parseHTMLElement(s)
 			if err != nil {
 				w.err = err
 				return resolve
@@ -363,7 +369,13 @@ func htmlLexToEndOfComment(w *htmlElementsCollectorWriter) htmlCollectorStateFun
 	return htmlLexToEndOfComment
 }
 
-func parseHTMLElement(elStr string) (el htmlElement, err error) {
+func (w *htmlElementsCollectorWriter) parseHTMLElement(elStr string) (el htmlElement, err error) {
+	conf := w.collector.conf
+
+	if !conf.IDs && !conf.Classes {
+		// Nothing to do.
+		return
+	}
 
 	tagName := parseStartTag(elStr)
 
@@ -390,8 +402,13 @@ func parseHTMLElement(elStr string) (el htmlElement, err error) {
 				switch {
 				case strings.EqualFold(a.Key, "id"):
 					// There should be only one, but one never knows...
-					el.IDs = append(el.IDs, a.Val)
+					if conf.IDs {
+						el.IDs = append(el.IDs, a.Val)
+					}
 				default:
+					if !conf.Classes {
+						continue
+					}
 					if classAttrRe.MatchString(a.Key) {
 						el.Classes = append(el.Classes, strings.Fields(a.Val)...)
 					} else {

publisher/htmlElementsCollector_test.go

@@ -22,6 +22,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/gohugoio/hugo/config"
 	"github.com/gohugoio/hugo/config/testconfig"
 	"github.com/gohugoio/hugo/media"
 	"github.com/gohugoio/hugo/minifiers"
@@ -136,7 +137,13 @@ func TestClassCollector(t *testing.T) {
 		} {
 
 			c.Run(fmt.Sprintf("%s--minify-%t", test.name, variant.minify), func(c *qt.C) {
-				w := newHTMLElementsCollectorWriter(newHTMLElementsCollector())
+				w := newHTMLElementsCollectorWriter(newHTMLElementsCollector(
+					config.WriteStats{
+						Tags:    true,
+						Classes: true,
+						IDs:     true,
+					},
+				))
 				if variant.minify {
 					if skipMinifyTest[test.name] {
 						c.Skip("skip minify test")
@@ -240,7 +247,13 @@ func BenchmarkElementsCollectorWriter(b *testing.B) {
 </html>
 `
 	for i := 0; i < b.N; i++ {
-		w := newHTMLElementsCollectorWriter(newHTMLElementsCollector())
+		w := newHTMLElementsCollectorWriter(newHTMLElementsCollector(
+			config.WriteStats{
+				Tags:    true,
+				Classes: true,
+				IDs:     true,
+			},
+		))
 		fmt.Fprint(w, benchHTML)
 
 	}
@@ -262,7 +275,13 @@ func BenchmarkElementsCollectorWriterPre(b *testing.B) {
 <div class="foo"></div>
 
 `
-	w := newHTMLElementsCollectorWriter(newHTMLElementsCollector())
+	w := newHTMLElementsCollectorWriter(newHTMLElementsCollector(
+		config.WriteStats{
+			Tags:    true,
+			Classes: true,
+			IDs:     true,
+		},
+	))
 	for i := 0; i < b.N; i++ {
 		fmt.Fprint(w, benchHTML)
 

publisher/publisher.go

@@ -81,8 +81,8 @@ func NewDestinationPublisher(rs *resources.Spec, outputFormats output.Formats, m
 	fs := rs.BaseFs.PublishFs
 	cfg := rs.Cfg
 	var classCollector *htmlElementsCollector
-	if rs.BuildConfig().WriteStats {
-		classCollector = newHTMLElementsCollector()
+	if rs.BuildConfig().WriteStats.Enabled() {
+		classCollector = newHTMLElementsCollector(rs.BuildConfig().WriteStats)
 	}
 	pub = DestinationPublisher{fs: fs, htmlElementsCollector: classCollector}
 	pub.min, err = minifiers.New(mediaTypes, outputFormats, cfg)