Migrate to realm for metadata

app/src/main/java/eu/kanade/tachiyomi/App.kt

@@ -10,11 +10,14 @@ import eu.kanade.tachiyomi.data.backup.BackupCreatorJob
 import eu.kanade.tachiyomi.data.library.LibraryUpdateJob
 import eu.kanade.tachiyomi.data.updater.UpdateCheckerJob
 import eu.kanade.tachiyomi.util.LocaleHelper
-import io.paperdb.Paper
+import io.realm.Realm
+import io.realm.RealmConfiguration
 import timber.log.Timber
 import uy.kohesive.injekt.Injekt
 import uy.kohesive.injekt.api.InjektScope
 import uy.kohesive.injekt.registry.default.DefaultRegistrar
+import java.io.File
+import kotlin.concurrent.thread
 
 open class App : Application() {
 
@@ -26,7 +29,7 @@ open class App : Application() {
         if (BuildConfig.DEBUG) Timber.plant(Timber.DebugTree())
 
         setupJobManager()
-        Paper.init(this) //Setup metadata DB (EH)
+        setupRealm() //Setup metadata DB (EH)
         Reprint.initialize(this) //Setup fingerprint (EH)
 
         LocaleHelper.updateConfiguration(this, resources.configuration)
@@ -55,4 +58,25 @@ open class App : Application() {
         }
     }
 
+    private fun setupRealm() {
+        Realm.init(this)
+        val config = RealmConfiguration.Builder()
+                .name("gallery-metadata.realm")
+                .schemaVersion(1)
+                .build()
+        Realm.setDefaultConfiguration(config)
+
+        //Delete old paper db files
+        listOf(
+                File(filesDir, "gallery-ex"),
+                File(filesDir, "gallery-perveden"),
+                File(filesDir, "gallery-nhentai")
+        ).forEach {
+            if(it.exists()) {
+                thread {
+                    it.deleteRecursively()
+                }
+            }
+        }
+    }
 }