Add RuneCount to Page

Fixes #1266

hugolib/page_test.go

@@ -138,6 +138,16 @@ title: Simple
 Summary Same Line<!--more-->
 
 Some more text
+`
+
+	SIMPLE_PAGE_WITH_FIVE_MULTIBYTE_UFT8_RUNES = `---
+title: Simple
+---
+
+
+€ € € € €
+
+
 `
 
 	SIMPLE_PAGE_WITH_LONG_CONTENT = `---
@@ -470,6 +480,21 @@ func TestPageWithDate(t *testing.T) {
 	checkPageDate(t, p, d)
 }
 
+func TestRuneCount(t *testing.T) {
+	p, _ := NewPage("simple.md")
+	_, err := p.ReadFrom(strings.NewReader(SIMPLE_PAGE_WITH_FIVE_MULTIBYTE_UFT8_RUNES))
+	p.Convert()
+	p.analyzePage()
+	if err != nil {
+		t.Fatalf("Unable to create a page with frontmatter and body content: %s", err)
+	}
+
+	if p.RuneCount() != 5 {
+		t.Fatalf("incorrect rune count for content '%s'. expected %v, got %v", p.plain, 1, p.RuneCount())
+
+	}
+}
+
 func TestWordCount(t *testing.T) {
 	p, _ := NewPage("simple.md")
 	_, err := p.ReadFrom(strings.NewReader(SIMPLE_PAGE_WITH_LONG_CONTENT))