Add mechanism to populate datastore with default data

preferences/src/main/java/de/mm20/launcher2/preferences/DataStore.kt

@@ -1,12 +1,26 @@
 package de.mm20.launcher2.preferences
 
 import android.content.Context
+import android.util.Log
 import androidx.datastore.core.DataStore
+import androidx.datastore.core.handlers.ReplaceFileCorruptionHandler
 import androidx.datastore.dataStore
+import de.mm20.launcher2.crashreporter.CrashReporter
+import de.mm20.launcher2.preferences.migrations.FactorySettingsMigration
 
 typealias LauncherDataStore = DataStore<Settings>
 
 val Context.dataStore: LauncherDataStore by dataStore(
     fileName = "settings.pb",
-    serializer = SettingsSerializer
+    serializer = SettingsSerializer,
-)
+    produceMigrations = {
+        listOf(FactorySettingsMigration(it))
+    },
+    corruptionHandler = ReplaceFileCorruptionHandler {
+        CrashReporter.logException(it)
+        Log.d("MM20", "corruptionHandler")
+        Settings.getDefaultInstance()
+    }
+)
+
+internal const val SchemaVersion = 1

preferences/src/main/java/de/mm20/launcher2/preferences/Defaults.kt

@@ -0,0 +1,20 @@
+package de.mm20.launcher2.preferences
+
+import android.content.Context
+
+fun createFactorySettings(context: Context): Settings {
+    return Settings.newBuilder()
+        .setAppearance(Settings.AppearanceSettings
+            .newBuilder()
+            .setTheme(Settings.AppearanceSettings.Theme.System)
+            .setColorScheme(Settings.AppearanceSettings.ColorScheme.Default)
+            .build()
+        )
+        .setWeather(Settings.WeatherSettings
+            .newBuilder()
+            .setProvider(Settings.WeatherSettings.WeatherProvider.MetNo)
+            .setImperialUnits(context.resources.getBoolean(R.bool.default_imperialUnits))
+            .build()
+        )
+        .build()
+}

preferences/src/main/java/de/mm20/launcher2/preferences/migrations/FactorySettingsMigration.kt

@@ -0,0 +1,25 @@
+package de.mm20.launcher2.preferences.migrations
+
+import android.content.Context
+import android.util.Log
+import androidx.datastore.core.DataMigration
+import de.mm20.launcher2.preferences.SchemaVersion
+import de.mm20.launcher2.preferences.Settings
+import de.mm20.launcher2.preferences.createFactorySettings
+
+class FactorySettingsMigration(private val context: Context): DataMigration<Settings> {
+    override suspend fun cleanUp() {
+
+    }
+
+    override suspend fun migrate(currentData: Settings): Settings {
+        Log.d("MM20", "Initializing user settings…")
+        Log.d("MM20", "Done")
+        val defaults = createFactorySettings(context)
+        return defaults.toBuilder().setVersion(SchemaVersion).build()
+    }
+
+    override suspend fun shouldMigrate(currentData: Settings): Boolean {
+        return currentData.version == 0
+    }
+}

preferences/src/main/proto/settings.proto

@@ -4,6 +4,7 @@ option java_package = "de.mm20.launcher2.preferences";
 option java_multiple_files = true;
 
 message Settings {
+  uint32 version = 1;
   message AppearanceSettings {
     enum Theme {
       Light = 0;
@@ -42,7 +43,7 @@ message Settings {
     }
     ClockStyle clock_style = 8;
   }
-  AppearanceSettings appearance = 1;
+  AppearanceSettings appearance = 2;
 
   message SearchSettings {
     bool show_favorites = 1;
@@ -69,7 +70,7 @@ message Settings {
     bool gdrive = 18;
     bool gdrive_mobile_data = 19;
   }
-  SearchSettings search = 2;
+  SearchSettings search = 3;
 
   message BadgeSettings {
     bool notification_badges = 1;
@@ -78,7 +79,7 @@ message Settings {
     bool profile_badges = 4;
     bool shortcut_badges = 5;
   }
-  BadgeSettings badges = 3;
+  BadgeSettings badges = 4;
 
   message WeatherSettings {
     enum WeatherProvider {
@@ -90,6 +91,6 @@ message Settings {
     WeatherProvider provider = 1;
     bool imperial_units = 2;
   }
-  WeatherSettings weather = 4;
+  WeatherSettings weather = 5;
 
 }