Deduplicating area in title

hack/tools/release/notes.go

@@ -435,6 +435,7 @@ type releaseNoteEntry struct {
 	prNumber string
 }
 
+// modifyEntryTitle removes the specified prefixes from the title.
 func modifyEntryTitle(title string, prefixes []string) string {
 	entryWithoutTag := title
 	for _, prefix := range prefixes {
@@ -444,6 +445,16 @@ func modifyEntryTitle(title string, prefixes []string) string {
 	return strings.ToUpper(string(entryWithoutTag[0])) + entryWithoutTag[1:]
 }
 
+// trimAreaFromTitle removes area from title to avoid duplication.
+func trimAreaFromTitle(title, area string) string {
+	titleWithoutArea := title
+	position := strings.Index(title, area+":")
+	if position != -1 {
+		titleWithoutArea = strings.TrimSpace(titleWithoutArea[position+len(area+":"):])
+	}
+	return titleWithoutArea
+}
+
 // generateReleaseNoteEntry processes a commit into a PR line item for the release notes.
 func generateReleaseNoteEntry(c *commit) (*releaseNoteEntry, error) {
 	entry := &releaseNoteEntry{}
@@ -501,6 +512,7 @@ func generateReleaseNoteEntry(c *commit) (*releaseNoteEntry, error) {
 	}
 
 	if *prefixAreaLabel {
+		entry.title = trimAreaFromTitle(entry.title, area)
 		entry.title = fmt.Sprintf("- %s: %s", area, entry.title)
 	} else {
 		entry.title = fmt.Sprintf("- %s", entry.title)

hack/tools/release/notes_test.go

@@ -61,3 +61,47 @@ func Test_trimTitle(t *testing.T) {
 		})
 	}
 }
+
+func Test_trimAreaFromTitle(t *testing.T) {
+
+	tests := []struct {
+		name  string
+		title string
+		area  string
+		want  string
+	}{
+		{
+			name:  "PR title with area",
+			title: "test/e2e: improve logging for a detected rollout",
+			area:  "e2e",
+			want:  "improve logging for a detected rollout",
+		},
+		{
+			name:  "PR title without area",
+			title: "improve logging for a detected rollout",
+			area:  "e2e",
+			want:  "improve logging for a detected rollout",
+		},
+		{
+			name:  "PR title without area being prefixed",
+			title: "improve logging for a detected rollout to improve e2e tests",
+			area:  "e2e",
+			want:  "improve logging for a detected rollout to improve e2e tests",
+		},
+		{
+			name:  "PR title without space between area and title",
+			title: "test/e2e:improve logging for a detected rollout",
+			area:  "e2e",
+			want:  "improve logging for a detected rollout",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := trimAreaFromTitle(tt.title, tt.area); got != tt.want {
+				t.Errorf("trimAreaFromTitle() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+
+}