Enhance smartLabelFor function (#135683)

* Enhance smartLabelFor function to support additional acronym "PDB" and add unit tests

* Remove "PDB" acronym from commonAcronyms in smartLabelFor function

staging/src/k8s.io/kubectl/pkg/describe/describe.go

@@ -358,17 +358,41 @@ func smartLabelFor(field string) string {
 
 	commonAcronyms := []string{"API", "URL", "UID", "OSB", "GUID"}
 	parts := camelcase.Split(field)
-	result := make([]string, 0, len(parts))
-	for _, part := range parts {
+
+	mergedParts := make([]string, 0, len(parts))
+	for i := 0; i < len(parts); i++ {
+		part := parts[i]
+		if i < len(parts)-1 {
+			nextPart := parts[i+1]
+			// Merge if current part is 2+ uppercase letters and next starts with uppercase
+			allUpper := true
+			for _, r := range part {
+				if unicode.IsLetter(r) && !unicode.IsUpper(r) {
+					allUpper = false
+					break
+				}
+			}
+			if len(part) >= 2 && allUpper && len(nextPart) > 0 && unicode.IsUpper(rune(nextPart[0])) {
+				mergedParts = append(mergedParts, part+nextPart)
+				i++
+				continue
+			}
+		}
+		mergedParts = append(mergedParts, part)
+	}
+
+	result := make([]string, 0, len(mergedParts))
+	for _, part := range mergedParts {
 		if part == "_" {
 			continue
 		}
 
-		if slice.Contains[string](commonAcronyms, strings.ToUpper(part), nil) {
+		if slice.Contains(commonAcronyms, strings.ToUpper(part), nil) {
 			part = strings.ToUpper(part)
-		} else {
+		} else if strings.ToLower(part) == part {
 			part = cases.Title(language.English).String(part)
 		}
+
 		result = append(result, part)
 	}
 

staging/src/k8s.io/kubectl/pkg/describe/describe_test.go

@@ -7128,3 +7128,27 @@ func TestDescribeProjectedVolumesOptionalSecret(t *testing.T) {
 		t.Errorf("expected to find %q in output: %q", expectedOut, out)
 	}
 }
+
+func TestSmartLabelFor(t *testing.T) {
+	tests := []struct {
+		input    string
+		expected string
+	}{
+		{"simpleField", "Simple Field"},
+		{"respectPDBs", "Respect PDBs"},
+		{"respectPDB", "Respect PDB"},
+		{"apiURL", "API URL"},
+		{"kubeAPI", "Kube API"},
+		{"userUID", "User UID"},
+		{"HTTPSProxy", "HTTPSProxy"},  // Multiple capitals stay together
+		{"customCRDs", "Custom CRDs"}, // Another pluralized acronym
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.input, func(t *testing.T) {
+			if got := smartLabelFor(tt.input); got != tt.expected {
+				t.Errorf("smartLabelFor(%q) = %q, want %q", tt.input, got, tt.expected)
+			}
+		})
+	}
+}