Memoize the glob statement

Because we were doing the same work many times :(

utils/modifycommand_test.go

@@ -705,6 +705,58 @@ func TestLoadCommandsFromCookFilesNoYamlFiles(t *testing.T) {
 // 	}
 // }
 
+func TestExpandGlobsMemoization(t *testing.T) {
+	tmpDir, err := os.MkdirTemp("", "expand-globs-memo-test")
+	if err != nil {
+		t.Fatalf("Failed to create temp dir: %v", err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	err = os.WriteFile(filepath.Join(tmpDir, "test1.go"), []byte("test"), 0644)
+	if err != nil {
+		t.Fatalf("Failed to create test file: %v", err)
+	}
+	err = os.WriteFile(filepath.Join(tmpDir, "test2.go"), []byte("test"), 0644)
+	if err != nil {
+		t.Fatalf("Failed to create test file: %v", err)
+	}
+
+	origDir, _ := os.Getwd()
+	os.Chdir(tmpDir)
+	defer os.Chdir(origDir)
+
+	cwd, _ := os.Getwd()
+	resolvedCwd := ResolvePath(cwd)
+	pattern1 := resolvedCwd + "/*.go"
+	patterns := map[string]struct{}{pattern1: {}}
+
+	globMemoTable = make(map[string][]string)
+
+	files1, err := ExpandGlobs(patterns)
+	if err != nil {
+		t.Fatalf("ExpandGlobs failed: %v", err)
+	}
+	if len(files1) != 2 {
+		t.Fatalf("Expected 2 files, got %d", len(files1))
+	}
+
+	if len(globMemoTable) != 1 {
+		t.Fatalf("Expected 1 entry in memo table, got %d", len(globMemoTable))
+	}
+
+	files2, err := ExpandGlobs(patterns)
+	if err != nil {
+		t.Fatalf("ExpandGlobs failed: %v", err)
+	}
+	if len(files2) != 2 {
+		t.Fatalf("Expected 2 files, got %d", len(files2))
+	}
+
+	if len(globMemoTable) != 1 {
+		t.Fatalf("Expected memo table to still have 1 entry, got %d", len(globMemoTable))
+	}
+}
+
 // LoadCommandsFromCookFile returns an error for a malformed YAML file
 // func TestLoadCommandsFromCookFilesMalformedYAML(t *testing.T) {
 // 	// Setup test directory with mock YAML files