Use os.UserConfigDir for internal.ConfigDir if available

internal/internal.go

@@ -22,6 +22,10 @@ func ConfigDir() (string, error) {
 		return configDir, nil
 	}
 
+	if osUserConfigDir := getOSUserConfigDir(); osUserConfigDir != "" {
+		return osUserConfigDir, nil
+	}
+
 	if runtime.GOOS == "windows" {
 		return filepath.Join(os.Getenv("APPDATA"), "gops"), nil
 	}

internal/internal_go1_13.go

@@ -0,0 +1,19 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build go1.13
+
+package internal
+
+import (
+	"os"
+)
+
+func getOSUserConfigDir() string {
+	configDir, err := os.UserConfigDir()
+	if err != nil {
+		return ""
+	}
+	return configDir
+}

internal/internal_lt_go1_13.go

@@ -0,0 +1,11 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !go1.13
+
+package internal
+
+func getOSUserConfigDir() string {
+	return ""
+}