🛠️ Migration (booksDir deletion)

* Delete booksDir(if exists), which does not serve any purpose

Part-of: #134

app/src/main/java/ua/acclorite/book_story/data/di/AppModule.kt

@@ -62,6 +62,9 @@ object AppModule {
     @Provides
     @Singleton
     fun provideBookDao(app: Application): BookDao {
+        // Additional Migrations
+        DatabaseHelper.MIGRATION_7_8.removeBooksDir(app)
+
         return Room.databaseBuilder(
             app,
             BookDatabase::class.java,

app/src/main/java/ua/acclorite/book_story/data/local/room/BookDatabase.kt

@@ -1,5 +1,6 @@
 package ua.acclorite.book_story.data.local.room
 
+import android.app.Application
 import androidx.room.AutoMigration
 import androidx.room.Database
 import androidx.room.DeleteColumn
@@ -12,6 +13,7 @@ import ua.acclorite.book_story.data.local.dto.BookEntity
 import ua.acclorite.book_story.data.local.dto.ColorPresetEntity
 import ua.acclorite.book_story.data.local.dto.FavoriteDirectoryEntity
 import ua.acclorite.book_story.data.local.dto.HistoryEntity
+import java.io.File
 
 @Database(
     entities = [
@@ -87,5 +89,20 @@ object DatabaseHelper {
 
     @DeleteColumn("BookEntity", "textPath")
     @DeleteColumn("BookEntity", "chapters")
-    class MIGRATION_7_8 : AutoMigrationSpec
+    class MIGRATION_7_8 : AutoMigrationSpec {
+        companion object {
+            /**
+             * Along with textPath deletion,
+             * books directory with text does not
+             * serve any purpose.
+             */
+            fun removeBooksDir(application: Application) {
+                val booksDir = File(application.filesDir, "books")
+
+                if (booksDir.exists()) {
+                    booksDir.deleteRecursively()
+                }
+            }
+        }
+    }
 }