Fail with error if a reserved name is used as sketch name

Author: MatteoPologruto

Diff for: commands/sketch/new.go

@@ -40,6 +40,9 @@ void loop() {
 var sketchNameMaxLength = 63
 var sketchNameValidationRegex = regexp.MustCompile(`^[0-9a-zA-Z_][0-9a-zA-Z_\.-]*$`)
 
+var invalidNames = []string{"CON", "PRN", "AUX", "NUL", "COM0", "COM1", "COM2", "COM3", "COM4", "COM5",
+	"COM6", "COM7", "COM8", "COM9", "LPT0", "LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9"}
+
 // NewSketch creates a new sketch via gRPC
 func NewSketch(ctx context.Context, req *rpc.NewSketchRequest) (*rpc.NewSketchResponse, error) {
 	var sketchesDir string
@@ -84,5 +87,10 @@ func validateSketchName(name string) error {
 		return &arduino.CantCreateSketchError{Cause: errors.New(tr(`invalid sketch name "%[1]s": the first character must be alphanumeric or "_", the following ones can also contain "-" and ".". The last one cannot be ".".`,
 			name))}
 	}
+	for _, invalid := range invalidNames {
+		if name == invalid {
+			return &arduino.CantCreateSketchError{Cause: errors.New(tr(`sketch name cannot be the reserved name "%[1]s"`, invalid))}
+		}
+	}
 	return nil
 }

Diff for: commands/sketch/new_test.go

@@ -91,3 +91,15 @@ func Test_SketchNameOk(t *testing.T) {
 		require.Nil(t, err)
 	}
 }
+
+func Test_SketchNameReserved(t *testing.T) {
+	invalidNames := []string{"CON", "PRN", "AUX", "NUL", "COM0", "COM1", "COM2", "COM3", "COM4", "COM5",
+		"COM6", "COM7", "COM8", "COM9", "LPT0", "LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9"}
+	for _, name := range invalidNames {
+		_, err := NewSketch(context.Background(), &commands.NewSketchRequest{
+			SketchName: name,
+			SketchDir:  t.TempDir(),
+		})
+		require.EqualError(t, err, fmt.Sprintf(`Can't create sketch: sketch name cannot be the reserved name "%s"`, name))
+	}
+}