resources/page: Fix truncated summary logic

Fixes #13967
Fixes #13968

hugolib/page__content.go

@@ -645,8 +645,9 @@ func (c *cachedContentScope) contentRendered(ctx context.Context) (contentSummar
 			}
 			html := cp.po.p.s.ContentSpec.TrimShortHTML(b.Bytes(), cp.po.p.m.pageConfig.Content.Markup)
 			rs.Value.summary = page.Summary{
-				Text: helpers.BytesToHTML(html),
+				Text:      helpers.BytesToHTML(html),
-				Type: page.SummaryTypeFrontMatter,
+				Type:      page.SummaryTypeFrontMatter,
+				Truncated: rs.Value.summary.Truncated,
 			}
 			rs.Value.contentWithoutSummary = rs.Value.content
 		}

resources/page/page_markup.go

@@ -104,7 +104,7 @@ func (s HtmlSummary) trimSpace(ss string) string {
 
 func (s HtmlSummary) Content() string {
 	if s.Divider.IsZero() {
-		return s.source
+		return s.trimSpace(s.source)
 	}
 	ss := s.source[:s.Divider.Low]
 	ss += s.source[s.Divider.High:]
@@ -139,7 +139,7 @@ func (s HtmlSummary) ContentWithoutSummary() string {
 }
 
 func (s HtmlSummary) Truncated() bool {
-	return s.SummaryLowHigh.High < len(s.source)
+	return s.Summary() != s.Content()
 }
 
 func (s *HtmlSummary) resolveParagraphTagAndSetWrapper(mt media.Type) tagReStartEnd {

resources/page/page_markup_integration_test.go

@@ -14,6 +14,8 @@
 package page_test
 
 import (
+	"strconv"
+	"strings"
 	"testing"
 
 	"github.com/gohugoio/hugo/hugolib"
@@ -347,3 +349,74 @@ Summary Truncated: {{ .Truncated }}|
 		"Summary: <div class=\"paragraph\">\n<p>This is summary.</p>\n</div>|\nSummary Type: manual|\nSummary Truncated: true|",
 	)
 }
+
+func TestIssue13967(t *testing.T) {
+	t.Parallel()
+
+	files := `
+-- hugo.toml --
+disableKinds = ['home','rss','section','sitemap','taxonomy','term']
+-- layouts/all.html --
+Title: {{ .Title }}|Summary: {{ .Summary }}|Truncated: {{ .Truncated }}|
+-- content/p1.md --
+---
+title: p1
+---
+<!--more--> one two three
+-- content/p2.md --
+---
+title: p2
+---
+one <!--more--> two three
+-- content/p3.md --
+---
+title: p3
+---
+one two <!--more--> three
+-- content/p4.md --
+---
+title: p4
+---
+one two three <!--more-->
+`
+	b := hugolib.Test(t, files)
+
+	b.AssertFileContent("public/p1/index.html", `Title: p1|Summary: |Truncated: true|`)
+	b.AssertFileContent("public/p2/index.html", `Title: p2|Summary: <p>one</p>|Truncated: true|`)
+	b.AssertFileContent("public/p3/index.html", `Title: p3|Summary: <p>one two</p>|Truncated: true|`)
+	b.AssertFileContent("public/p4/index.html", `Title: p4|Summary: <p>one two three</p>|Truncated: false|`)
+}
+
+func TestIssue13968(t *testing.T) {
+	t.Parallel()
+
+	files := `
+-- hugo.toml --
+disableKinds = ['page','rss','section','sitemap','taxonomy','term']
+summaryLength = SUMMARY_LENGTH
+-- layouts/all.html --
+Title: {{ .Title }}|Summary: {{ .Summary }}|Truncated: {{ .Truncated }}|
+-- content/_index.md --
+---
+title: home
+---
+one two three
+`
+
+	tests := []struct {
+		summaryLength int
+		want          string
+	}{
+		{0, "Title: home|Summary: |Truncated: true|"},
+		{1, "Title: home|Summary: <p>one two three</p>|Truncated: false|"},
+		{2, "Title: home|Summary: <p>one two three</p>|Truncated: false|"},
+		{3, "Title: home|Summary: <p>one two three</p>|Truncated: false|"},
+		{4, "Title: home|Summary: <p>one two three</p>|Truncated: false|"},
+	}
+
+	for _, tt := range tests {
+		f := strings.ReplaceAll(files, "SUMMARY_LENGTH", strconv.Itoa(tt.summaryLength))
+		b := hugolib.Test(t, f)
+		b.AssertFileContent("public/index.html", tt.want)
+	}
+}