Use truncated entry description as title if unavailable

reader/sanitizer/truncate.go

@@ -0,0 +1,23 @@
+// Copyright 2022 Frédéric Guillot. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+package sanitizer
+
+import "strings"
+
+func TruncateHTML(input string, max int) string {
+	text := StripTags(input)
+	text = strings.ReplaceAll(text, "\n", " ")
+	text = strings.ReplaceAll(text, "\t", " ")
+	text = strings.ReplaceAll(text, "  ", " ")
+	text = strings.TrimSpace(text)
+
+	// Convert to runes to be safe with unicode
+	runes := []rune(text)
+	if len(runes) > max {
+		return strings.TrimSpace(string(runes[:max])) + "…"
+	}
+
+	return text
+}

reader/sanitizer/truncate_test.go

@@ -0,0 +1,65 @@
+// Copyright 2022 Frédéric Guillot. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+package sanitizer
+
+import "testing"
+
+func TestTruncateHTMWithTextLowerThanLimitL(t *testing.T) {
+	input := `This is a <strong>bug 🐛</strong>.`
+	expected := `This is a bug 🐛.`
+	output := TruncateHTML(input, 50)
+
+	if expected != output {
+		t.Errorf(`Wrong output: %q != %q`, expected, output)
+	}
+}
+
+func TestTruncateHTMLWithTextAboveLimit(t *testing.T) {
+	input := `This is <strong>HTML</strong>.`
+	expected := `This…`
+	output := TruncateHTML(input, 4)
+
+	if expected != output {
+		t.Errorf(`Wrong output: %q != %q`, expected, output)
+	}
+}
+
+func TestTruncateHTMLWithUnicodeTextAboveLimit(t *testing.T) {
+	input := `This is a <strong>bike 🚲</strong>.`
+	expected := `This…`
+	output := TruncateHTML(input, 4)
+
+	if expected != output {
+		t.Errorf(`Wrong output: %q != %q`, expected, output)
+	}
+}
+
+func TestTruncateHTMLWithMultilineTextAboveLimit(t *testing.T) {
+	input := `
+		This is a <strong>bike
+		🚲</strong>.
+
+	`
+	expected := `This is a bike…`
+	output := TruncateHTML(input, 15)
+
+	if expected != output {
+		t.Errorf(`Wrong output: %q != %q`, expected, output)
+	}
+}
+
+func TestTruncateHTMLWithMultilineTextLowerThanLimit(t *testing.T) {
+	input := `
+		This is a <strong>bike
+ 🚲</strong>.
+
+	`
+	expected := `This is a bike 🚲.`
+	output := TruncateHTML(input, 20)
+
+	if expected != output {
+		t.Errorf(`Wrong output: %q != %q`, expected, output)
+	}
+}