IMPROVEMENT-12: Refactor and fix a couple minor bugs

cmd/goto/main.go

@@ -46,7 +46,7 @@ func main() {
 	flag.Parse()
 
 	var err error
-	commandLineParams.AppHome, err = utils.GetAppDir(appName, commandLineParams.AppHome)
+	commandLineParams.AppHome, err = utils.AppDir(appName, commandLineParams.AppHome)
 	if err != nil {
 		log.Fatalf("Can't get application home folder: %v", err)
 	}

internal/constant/constant.go

@@ -2,7 +2,10 @@ package constant
 
 import "errors"
 
-var ErrNotFound = errors.New("not found")
+var (
+	ErrNotFound    = errors.New("not found")
+	ErrBadArgument = errors.New("bad argument")
+)
 
 // ErrDuplicateRecord = errors.New("duplicate record")
 // ErrDeleted         = errors.New("deleted")

internal/ui/component/edithost/edit_host.go

@@ -77,7 +77,7 @@ func New(ctx context.Context, storage storage.HostStorage, state *state.Applicat
 		case 3:
 			t.Label = "Login"
 			t.CharLimit = 128
-			t.Placeholder = fmt.Sprintf("default: %s", utils.GetCurrentOSUser())
+			t.Placeholder = fmt.Sprintf("default: %s", utils.CurrentOSUsername())
 			t.SetValue(host.LoginName)
 		case 4:
 			t.Label = "Port"

internal/utils/utils.go

@@ -6,29 +6,45 @@ import (
 	"os/user"
 	"path"
 	"path/filepath"
+	"strings"
+
+	"github.com/grafviktor/goto/internal/constant"
 )
 
 type Logger interface {
 	Debug(format string, args ...any)
 }
 
+func stringEmpty(s string) bool {
+	return len(strings.TrimSpace(s)) == 0
+}
+
 func CreateAppDirIfNotExists(appConfigDir string) error {
-	_, err := os.Stat(appConfigDir)
+	if stringEmpty(appConfigDir) {
+		return constant.ErrBadArgument
+	}
 
+	stat, err := os.Stat(appConfigDir)
 	if os.IsNotExist(err) {
-		err = os.MkdirAll(appConfigDir, 0o700)
-		if err != nil {
-			return err
-		}
+		return os.MkdirAll(appConfigDir, 0o700)
 	} else if err != nil {
 		return err
 	}
 
+	if !stat.IsDir() {
+		return errors.New("app home path exists and it is not a directory")
+	}
+
 	return nil
 }
 
-func GetAppDir(appName, userDefinedPath string) (string, error) {
-	if len(userDefinedPath) > 0 {
+// AppDir - returns application home folder where all all files are stored.
+// appName is application name which will be used as folder name.
+// userDefinedPath allows you to set a custom path to application home folder, can be relative or absolute.
+// If userDefinedPath is not empty, it will be used as application home folder
+// Else, userConfigDir will be used, which is system dependent.
+func AppDir(appName, userDefinedPath string) (string, error) {
+	if !stringEmpty(userDefinedPath) {
 		absolutePath, err := filepath.Abs(userDefinedPath)
 		if err != nil {
 			return "", err
@@ -46,9 +62,12 @@ func GetAppDir(appName, userDefinedPath string) (string, error) {
 		return absolutePath, nil
 	}
 
-	// FIXME: -------- DEBUG ------------- /
+	if stringEmpty(appName) {
+		return "", errors.New("application home folder name is not provided")
+	}
+
+	// Left for debugging purposes
 	// userConfigDir, err := os.Getwd()
-	// -------- RELEASE ----------- /
 	userConfigDir, err := os.UserConfigDir()
 	if err != nil {
 		return "", err
@@ -57,7 +76,8 @@ func GetAppDir(appName, userDefinedPath string) (string, error) {
 	return path.Join(userConfigDir, appName), nil
 }
 
-func GetCurrentOSUser() string {
+// CurrentOSUsername - returns current OS username or "n/a" if it can't be determined.
+func CurrentOSUsername() string {
 	user, err := user.Current()
 	if err != nil {
 		return "n/a"