Caching toots (#809)

* Initial timeline cache implementation

* Fix build/DI errors for caching

* Rename timeline entities tables. Add migration. Add DB scheme file.

* Fix uniqueness problem, change offline strategy, improve mapping

* Try to merge in new statuses, fix bottom loading, fix saving spans.

* Fix reblogs IDs, fix inserting elements from top

* Send one more request to get latest timeline statuses

* Give Timeline placeholders string id. Rewrite Either in Kotlin

* Initial placeholder implementation for caching

* Fix crash on removing overlap statuses

* Migrate counters to long

* Remove unused counters. Add minimal TimelineDAOTest

* Fix bug with placeholder ID

* Update cache in response to events. Refactor TimelineCases

* Fix crash, reduce number of placeholders

* Fix crash, fix filtering, improve placeholder handling

* Fix migration, add 8-9 migration test

* Fix initial timeline update, remove more placeholders

* Add cleanup for old statuses

* Fix cleanup

* Delete ExampleInstrumentedTest

* Improve timeline UX regarding caching

* Fix typos

* Fix initial timeline update

* Cleanup/fix initial timeline update

* Workaround for weird behavior of first post on initial tl update.

* Change counter types back to int

* Clear timeline cache on logout

* Fix loading when timeline is completely empty

* Fix androidx migration issues

* Fix tests

* Apply caching feedback

* Save account emojis to cache

* Fix warnings and bugs

app/src/main/java/com/keylesspalace/tusky/di/AppComponent.kt

@@ -34,7 +34,8 @@ import javax.inject.Singleton
     ActivitiesModule::class,
     ServicesModule::class,
     BroadcastReceiverModule::class,
-    ViewModelModule::class
+    ViewModelModule::class,
+    RepositoryModule::class
 ])
 interface AppComponent {
     @Component.Builder

app/src/main/java/com/keylesspalace/tusky/di/NetworkModule.kt

@@ -86,7 +86,7 @@ class NetworkModule {
     @Singleton
     fun providesRetrofit(httpClient: OkHttpClient,
                          converters: @JvmSuppressWildcards Set<Converter.Factory>): Retrofit {
-        return Retrofit.Builder().baseUrl("https://"+MastodonApi.PLACEHOLDER_DOMAIN)
+        return Retrofit.Builder().baseUrl("https://" + MastodonApi.PLACEHOLDER_DOMAIN)
                 .client(httpClient)
                 .let { builder ->
                     // Doing it this way in case builder will be immutable so we return the final

app/src/main/java/com/keylesspalace/tusky/di/RepositoryModule.kt

@@ -0,0 +1,19 @@
+package com.keylesspalace.tusky.di
+
+import com.google.gson.Gson
+import com.keylesspalace.tusky.db.AccountManager
+import com.keylesspalace.tusky.db.AppDatabase
+import com.keylesspalace.tusky.network.MastodonApi
+import com.keylesspalace.tusky.repository.TimelineRepository
+import com.keylesspalace.tusky.repository.TimelineRepositoryImpl
+import dagger.Module
+import dagger.Provides
+
+@Module
+class RepositoryModule {
+    @Provides
+    fun providesTimelineRepository(db: AppDatabase, mastodonApi: MastodonApi,
+                                   accountManager: AccountManager, gson: Gson): TimelineRepository {
+        return TimelineRepositoryImpl(db.timelineDao(), mastodonApi, accountManager, gson)
+    }
+}