Remove bbolt database dependency

Replaced bbolt-based database handling with Fyne built-in preferences for storing application settings. Deleted migration logic, database initialization, and error handling related to bbolt, simplifying the codebase and reducing external dependencies.

setting/directory_for_saving.go

@@ -1,8 +1,8 @@
 package setting
 
 type DirectoryForSavingContract interface {
-	GetDirectoryForSaving() (string, error)
-	SaveDirectoryForSaving(path string) (Setting, error)
+	GetDirectoryForSaving() string
+	SaveDirectoryForSaving(path string) Setting
 }
 
 type DirectoryForSaving struct {
@@ -13,10 +13,10 @@ func NewSettingDirectoryForSaving(settingRepository RepositoryContract) *Directo
 	return &DirectoryForSaving{settingRepository: settingRepository}
 }
 
-func (setting DirectoryForSaving) GetDirectoryForSaving() (string, error) {
+func (setting DirectoryForSaving) GetDirectoryForSaving() string {
 	return setting.settingRepository.GetValue("directoryForSaving")
 }
 
-func (setting DirectoryForSaving) SaveDirectoryForSaving(path string) (Setting, error) {
+func (setting DirectoryForSaving) SaveDirectoryForSaving(path string) Setting {
 	return setting.settingRepository.CreateOrUpdate("directoryForSaving", path)
 }

setting/entity.go

@@ -1,6 +1,6 @@
 package setting
 
 type Setting struct {
-	Code  string `json:"code"`
-	Value string `json:"value"`
+	Code  string
+	Value string
 }

setting/repository.go

@@ -1,82 +1,39 @@
 package setting
 
 import (
-	"encoding/json"
-	"errors"
-	"git.kor-elf.net/kor-elf/gui-for-ffmpeg/db"
-	"go.etcd.io/bbolt"
+	"fyne.io/fyne/v2"
 )
 
 type RepositoryContract interface {
-	Create(setting Setting) (Setting, error)
-	CreateOrUpdate(code string, value string) (Setting, error)
-	GetValue(code string) (value string, err error)
+	Create(setting Setting) Setting
+	CreateOrUpdate(code string, value string) Setting
+	GetValue(code string) string
 }
 
 type Repository struct {
-	db *bbolt.DB
+	app fyne.App
 }
 
-func NewRepository(db *bbolt.DB) *Repository {
-	return &Repository{db}
-}
-
-func (r Repository) GetValue(code string) (value string, err error) {
-	var setting Setting
-
-	err = r.db.View(func(tx *bbolt.Tx) error {
-		b := tx.Bucket([]byte("settings"))
-		if b == nil {
-			return errors.New("bucket 'settings' not found")
-		}
-		val := b.Get([]byte(code))
-		if val == nil {
-			return db.ErrRecordNotFound
-		}
-		return json.Unmarshal(val, &setting)
-	})
-	if err != nil {
-		return "", err
+func NewRepository(app fyne.App) *Repository {
+	return &Repository{
+		app: app,
 	}
-
-	return setting.Value, nil
-
 }
 
-func (r Repository) Create(setting Setting) (Setting, error) {
-	err := r.db.Update(func(tx *bbolt.Tx) error {
-		b := tx.Bucket([]byte("settings"))
-		if b == nil {
-			return errors.New("bucket 'settings' not found")
-		}
-
-		data, err := json.Marshal(setting)
-		if err != nil {
-			return err
-		}
-
-		return b.Put([]byte(setting.Code), data)
-	})
-	return setting, err
+func (r Repository) GetValue(code string) string {
+	return r.app.Preferences().String(code)
 }
 
-func (r Repository) CreateOrUpdate(code string, value string) (Setting, error) {
+func (r Repository) Create(setting Setting) Setting {
+	r.app.Preferences().SetString(setting.Code, setting.Value)
+	return setting
+}
+
+func (r Repository) CreateOrUpdate(code string, value string) Setting {
 	var setting Setting
 	setting.Code = code
 	setting.Value = value
 
-	err := r.db.Update(func(tx *bbolt.Tx) error {
-		b := tx.Bucket([]byte("settings"))
-		if b == nil {
-			return errors.New("bucket 'settings' not found")
-		}
-
-		data, err := json.Marshal(setting)
-		if err != nil {
-			return err
-		}
-
-		return b.Put([]byte(code), data)
-	})
-	return setting, err
+	r.app.Preferences().SetString(code, value)
+	return setting
 }