Restore Backend class; replace TaskRunner by Kotlin Coroutines

core/src/commonMain/kotlin/org/isoron/platform/concurrency/Tasks.kt

@@ -1,67 +0,0 @@
-/*
- * Copyright (C) 2016-2019 Álinson Santos Xavier <isoron@gmail.com>
- *
- * This file is part of Loop Habit Tracker.
- *
- * Loop Habit Tracker is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by the
- * Free Software Foundation, either version 3 of the License, or (at your
- * option) any later version.
- *
- * Loop Habit Tracker is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-package org.isoron.platform.concurrency
-
-/**
- * A TaskRunner provides the ability of running tasks in different queues. The
- * class is also observable, and notifies listeners when new tasks are started
- * or finished.
- *
- * Two queues are available: a foreground queue and a background queue. These
- * two queues may run in parallel, depending on the hardware. Multiple tasks
- * submitted to the same queue, however, always run sequentially, in the order
- * they were enqueued.
- */
-interface TaskRunner {
-
-    val listeners: MutableList<Listener>
-
-    val activeTaskCount: Int
-
-    fun runInBackground(task: () -> Unit)
-
-    fun runInForeground(task: () -> Unit)
-
-    interface Listener {
-        fun onTaskStarted()
-        fun onTaskFinished()
-    }
-}
-
-/**
- * Sequential implementation of TaskRunner. Both background and foreground
- * queues run in the same thread, so they block each other.
- */
-class SequentialTaskRunner : TaskRunner {
-
-    override val listeners = mutableListOf<TaskRunner.Listener>()
-
-    override var activeTaskCount = 0
-
-    override fun runInBackground(task: () -> Unit) {
-        activeTaskCount += 1
-        for (l in listeners) l.onTaskStarted()
-        task()
-        activeTaskCount -= 1
-        for (l in listeners) l.onTaskFinished()
-    }
-
-    override fun runInForeground(task: () -> Unit) = runInBackground(task)
-}

core/src/commonMain/kotlin/org/isoron/platform/io/Database.kt

@@ -19,6 +19,8 @@
 
 package org.isoron.platform.io
 
+import org.isoron.uhabits.*
+
 interface PreparedStatement {
     fun step(): StepResult
     fun finalize()
@@ -80,7 +82,9 @@ fun Database.getVersion() = queryInt("pragma user_version")
 
 fun Database.setVersion(v: Int) = run("pragma user_version = $v")
 
-suspend fun Database.migrateTo(newVersion: Int, fileOpener: FileOpener, log: Log) {
+suspend fun Database.migrateTo(newVersion: Int,
+                               fileOpener: FileOpener,
+                               log: Log) {
     val currentVersion = getVersion()
     log.debug("Database", "Current database version: $currentVersion")
 

core/src/commonMain/kotlin/org/isoron/uhabits/backend/Backend.kt

@@ -19,86 +19,118 @@
 
 package org.isoron.uhabits.backend
 
+import kotlinx.coroutines.*
 import org.isoron.platform.concurrency.*
 import org.isoron.platform.io.*
 import org.isoron.uhabits.*
 import org.isoron.uhabits.components.*
 import org.isoron.uhabits.i18n.*
 import org.isoron.uhabits.models.*
+import kotlin.coroutines.*
 
-class Backend(databaseName: String,
+
-              databaseOpener: DatabaseOpener,
+open class BackendScope(private val ctx: CoroutineContext,
-              fileOpener: FileOpener,
+                        private val log: Log) : CoroutineScope {
-              localeHelper: LocaleHelper,
+
+    private val job = Job()
+
+    private val exceptionHandler = CoroutineExceptionHandler { _, throwable ->
+        log.info("Coroutine", throwable.toString())
+    }
+
+    override val coroutineContext: CoroutineContext
+        get() = ctx + job + exceptionHandler
+}
+
+class Backend(private val databaseName: String,
+              private val databaseOpener: DatabaseOpener,
+              private val fileOpener: FileOpener,
+              private val localeHelper: LocaleHelper,
               private val log: Log,
-              private val taskRunner: TaskRunner) {
+              private val crCtx: CoroutineContext
-
+             ) : CoroutineScope by BackendScope(crCtx, log) {
-//    private val database: Database
+
-//
+
-//    private val habitsRepository: HabitRepository
+    private lateinit var database: Database
-//
+    private lateinit var habitsRepository: HabitRepository
-//    private val checkmarkRepository: CheckmarkRepository
+    private lateinit var checkmarkRepository: CheckmarkRepository
-//
+    lateinit var preferences: Preferences
-//    private val habits = mutableMapOf<Int, Habit>()
+
-//
+    lateinit var mainScreenDataSource: MainScreenDataSource
-//    private val checkmarks = mutableMapOf<Habit, CheckmarkList>()
+
-//
+    private val habits = mutableMapOf<Int, Habit>()
-//    private val scores = mutableMapOf<Habit, ScoreList>()
+    private val checkmarks = mutableMapOf<Habit, CheckmarkList>()
-
+    private val scores = mutableMapOf<Habit, ScoreList>()
-    val mainScreenDataSource: MainScreenDataSource? = null
+
-    val strings = localeHelper.getStringsForCurrentLocale()
+    var strings = localeHelper.getStringsForCurrentLocale()
-    val preferences: Preferences? = null
     var theme: Theme = LightTheme()
 
-    init {
+    val observable = Observable<Listener>()
-//        val dbFile = fileOpener.openUserFile(databaseName)
+
-//        if (!dbFile.exists()) {
+    fun init() {
-//            val templateFile = fileOpener.openResourceFile("databases/template.db")
+        launch {
-//            templateFile.copyTo(dbFile)
+            initDatabase()
-//        }
+            initRepositories()
-//        database = databaseOpener.open(dbFile)
+            initDataSources()
-//        database.migrateTo(LOOP_DATABASE_VERSION, fileOpener, log)
+            observable.notifyListeners { it.onReady() }
-//        preferences = Preferences(PreferencesRepository(database))
+        }
-//        habitsRepository = HabitRepository(database)
+    }
-//        checkmarkRepository = CheckmarkRepository(database)
+
-//        taskRunner.runInBackground {
+    private fun initRepositories() {
-//            habits.putAll(habitsRepository.findAll())
+        preferences = Preferences(PreferencesRepository(database))
-//            for ((key, habit) in habits) {
+        habitsRepository = HabitRepository(database)
-//                val checks = checkmarkRepository.findAll(key)
+        checkmarkRepository = CheckmarkRepository(database)
-//                checkmarks[habit] = CheckmarkList(habit.frequency, habit.type)
+        habits.putAll(habitsRepository.findAll())
-//                checkmarks[habit]?.setManualCheckmarks(checks)
+        log.info("Backend", "${habits.size} habits loaded")
-//                scores[habit] = ScoreList(checkmarks[habit]!!)
+        for ((key, habit) in habits) {
-//            }
+            val checks = checkmarkRepository.findAll(key)
-//        }
+            checkmarks[habit] = CheckmarkList(habit.frequency, habit.type)
-//        mainScreenDataSource = MainScreenDataSource(preferences,
+            checkmarks[habit]?.setManualCheckmarks(checks)
-//                                                    habits,
+            scores[habit] = ScoreList(checkmarks[habit]!!)
-//                                                    checkmarks,
+        }
-//                                                    scores,
+    }
-//                                                    taskRunner)
+
+    private fun initDataSources() {
+        mainScreenDataSource =
+                MainScreenDataSource(preferences, habits, checkmarks, scores)
+    }
+
+    private suspend fun initDatabase() {
+        val dbFile = fileOpener.openUserFile(databaseName)
+        if (!dbFile.exists()) {
+            val templateFile = fileOpener.openResourceFile("databases/template.db")
+            templateFile.copyTo(dbFile)
+        }
+        database = databaseOpener.open(dbFile)
+        database.migrateTo(LOOP_DATABASE_VERSION, fileOpener, log)
     }
 
     fun createHabit(habit: Habit) {
-//        val id = habitsRepository.nextId()
+        val id = habitsRepository.nextId()
-//        habit.id = id
+        habit.id = id
-//        habit.position = habits.size
+        habit.position = habits.size
-//        habits[id] = habit
+        habits[id] = habit
-//        checkmarks[habit] = CheckmarkList(habit.frequency, habit.type)
+        checkmarks[habit] = CheckmarkList(habit.frequency, habit.type)
-//        habitsRepository.insert(habit)
+        habitsRepository.insert(habit)
-//        mainScreenDataSource.requestData()
+        mainScreenDataSource.requestData()
     }
 
     fun deleteHabit(id: Int) {
-//        habits[id]?.let { habit ->
+        habits[id]?.let { habit ->
-//            habitsRepository.delete(habit)
+            habitsRepository.delete(habit)
-//            habits.remove(id)
+            habits.remove(id)
-//            mainScreenDataSource.requestData()
+            mainScreenDataSource.requestData()
-//        }
+        }
     }
 
     fun updateHabit(modified: Habit) {
-//        habits[modified.id]?.let { existing ->
+        habits[modified.id]?.let { existing ->
-//            modified.position = existing.position
+            modified.position = existing.position
-//            habitsRepository.update(modified)
+            habitsRepository.update(modified)
-//        }
+        }
+    }
+
+    interface Listener {
+        fun onReady()
     }
 }

core/src/commonMain/kotlin/org/isoron/uhabits/backend/MainScreenDataSource.kt

@@ -27,8 +27,7 @@ import org.isoron.uhabits.models.Checkmark.Companion.UNCHECKED
 class MainScreenDataSource(val preferences: Preferences,
                            val habits: MutableMap<Int, Habit>,
                            val checkmarks: MutableMap<Habit, CheckmarkList>,
-                           val scores: MutableMap<Habit, ScoreList>,
+                           val scores: MutableMap<Habit, ScoreList>) {
-                           val taskRunner: TaskRunner) {
 
     val maxNumberOfButtons = 60
     private val today = LocalDate(2019, 3, 30) /* TODO */
@@ -44,7 +43,6 @@ class MainScreenDataSource(val preferences: Preferences,
     }
 
     fun requestData() {
-        taskRunner.runInBackground {
         var filtered = habits.values.toList()
 
         if (!preferences.showArchived) {
@@ -68,12 +66,9 @@ class MainScreenDataSource(val preferences: Preferences,
             habit to scores[habit]!!.getAt(today)
         }
 
-            taskRunner.runInForeground {
         observable.notifyListeners { listener ->
             val data = Data(filtered, scores, checkmarks)
             listener.onDataChanged(data)
         }
     }
 }
-    }
-}

core/src/commonTest/kotlin/org/isoron/DependencyResolver.kt

@@ -1,30 +0,0 @@
-/*
- * Copyright (C) 2016-2019 Álinson Santos Xavier <isoron@gmail.com>
- *
- * This file is part of Loop Habit Tracker.
- *
- * Loop Habit Tracker is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by the
- * Free Software Foundation, either version 3 of the License, or (at your
- * option) any later version.
- *
- * Loop Habit Tracker is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-package org.isoron
-
-import org.isoron.platform.gui.*
-import org.isoron.platform.io.*
-
-expect class DependencyResolver() {
-    suspend fun getFileOpener(): FileOpener
-    suspend fun getDatabase(): Database
-    fun createCanvas(width: Int, height: Int): Canvas
-    fun exportCanvas(canvas: Canvas, filename: String)
-}

core/src/commonTest/kotlin/org/isoron/platform/gui/CanvasTest.kt

@@ -19,14 +19,9 @@
 
 package org.isoron.platform.gui
 
-import org.isoron.*
+class CanvasTest(val platform: Platform) {
-import kotlin.test.*
+    fun run() {
-
+        val canvas = platform.createCanvas(500, 400)
-class CanvasTest() : BaseTest() {
-
-    @Test
-    fun testDrawing() {
-        val canvas = resolver.createCanvas(500, 400)
 
         canvas.setColor(Color(0x303030))
         canvas.fillRect(0.0, 0.0, 500.0, 400.0)
@@ -66,6 +61,11 @@ class CanvasTest() : BaseTest() {
         canvas.setFont(Font.FONT_AWESOME)
         canvas.drawText(FontAwesome.CHECK, 250.0, 300.0)
 
-        resolver.exportCanvas(canvas, "CanvasTest.png")
+        platform.exportCanvas(canvas, "CanvasTest.png")
+    }
+
+    interface Platform {
+        fun createCanvas(width: Int, height: Int): Canvas
+        fun exportCanvas(canvas: Canvas, filename: String)
     }
 }

core/src/commonTest/kotlin/org/isoron/platform/io/DatabaseTest.kt

@@ -19,12 +19,10 @@
 
 package org.isoron.platform.io
 
-import org.isoron.*
 import kotlin.test.*
 
-class DatabaseTest() : BaseTest() {
+class DatabaseTest(val db: Database)  {
-    suspend fun testUsage() {
+    fun testUsage() {
-        val db = resolver.getDatabase()
         db.setVersion(0)
         assertEquals(0, db.getVersion())
 

core/src/commonTest/kotlin/org/isoron/platform/io/FilesTest.kt

@@ -22,10 +22,8 @@ package org.isoron.platform.io
 import org.isoron.*
 import kotlin.test.*
 
-class FilesTest() : BaseTest() {
+class FilesTest(val fileOpener: FileOpener) {
     suspend fun testLines() {
-        val fileOpener = resolver.getFileOpener()
-
         assertFalse(fileOpener.openUserFile("non-existing-usr.txt").exists(),
                     "non-existing-usr.txt shouldn't exist")
 

core/src/commonTest/kotlin/org/isoron/uhabits/models/CheckmarkRepositoryTest.kt

@@ -20,13 +20,13 @@
 package org.isoron.uhabits.models
 
 import org.isoron.*
+import org.isoron.platform.io.*
 import org.isoron.platform.time.*
 import kotlin.test.*
 
 
-class CheckmarkRepositoryTest : BaseTest() {
+class CheckmarkRepositoryTest(val db: Database) {
-    suspend fun testCRUD() {
+    fun testCRUD() {
-        val db = resolver.getDatabase()
         val habitA = 10
         var checkmarksA = listOf(Checkmark(LocalDate(2019, 1, 15), 100),
                                  Checkmark(LocalDate(2019, 1, 7), 500),

core/src/commonTest/kotlin/org/isoron/uhabits/models/HabitRepositoryTest.kt

@@ -24,9 +24,8 @@ import org.isoron.platform.gui.*
 import org.isoron.platform.io.*
 import kotlin.test.*
 
-class HabitRepositoryTest() : BaseTest() {
+class HabitRepositoryTest(val db: Database) {
-    suspend fun testCRUD() {
+    fun testCRUD() {
-        val db = resolver.getDatabase()
         val original0 = Habit(id = 0,
                               name = "Wake up early",
                               description = "Did you wake up before 6am?",

core/src/commonTest/kotlin/org/isoron/uhabits/models/PreferencesRepositoryTest.kt

@@ -19,14 +19,12 @@
 
 package org.isoron.uhabits.models
 
-import org.isoron.*
+import org.isoron.platform.io.*
 import kotlin.test.*
 
-class PreferencesRepositoryTest : BaseTest() {
+class PreferencesRepositoryTest(val db: Database) {
-    suspend fun testUsage() {
+    fun testUsage() {
-        val db = resolver.getDatabase()
         val prefs = PreferencesRepository(db)
-
         assertEquals("default", prefs.getString("non_existing_key", "default"))
         prefs.putString("ringtone_path", "/tmp")
         assertEquals("/tmp", prefs.getString("ringtone_path", "none"))

core/src/iosMain/kotlin/org/isoron/platform/concurrency/UIDispatcher.kt

@@ -17,8 +17,17 @@
  * with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-package org.isoron
+package org.isoron.platform.concurrency
 
-val resolver = DependencyResolver()
+import kotlinx.coroutines.*
+import platform.darwin.*
+import kotlin.coroutines.*
 
-open class BaseTest
+class UIDispatcher : CoroutineDispatcher() {
+    override fun dispatch(context: CoroutineContext, block: Runnable) {
+        val queue = dispatch_get_main_queue()
+        dispatch_async(queue) {
+            block.run()
+        }
+    }
+}

core/src/iosTest/kotlin/org/isoron/DependencyResolver.kt

@@ -1,50 +0,0 @@
-/*
- * Copyright (C) 2016-2019 Álinson Santos Xavier <isoron@gmail.com>
- *
- * This file is part of Loop Habit Tracker.
- *
- * Loop Habit Tracker is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by the
- * Free Software Foundation, either version 3 of the License, or (at your
- * option) any later version.
- *
- * Loop Habit Tracker is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-@file:Suppress("UNCHECKED_CAST")
-
-package org.isoron
-
-import org.isoron.platform.gui.*
-import org.isoron.platform.io.*
-import platform.CoreGraphics.*
-import platform.Foundation.*
-import platform.UIKit.*
-
-actual class DependencyResolver {
-    actual suspend fun getFileOpener(): FileOpener {
-        return IosFileOpener()
-    }
-
-    actual suspend fun getDatabase(): Database = TODO()
-
-    actual fun createCanvas(width: Int, height: Int): Canvas {
-        UIGraphicsBeginImageContext(CGSizeMake(width=500.0, height=600.0))
-        return IosCanvas()
-    }
-
-    actual fun exportCanvas(canvas: Canvas, filename: String): Unit {
-        val image = UIGraphicsGetImageFromCurrentImageContext()!!
-        val manager = NSFileManager.defaultManager
-        val paths = manager.URLsForDirectory(NSDocumentDirectory, NSUserDomainMask) as List<NSURL>
-        val filePath = paths.first().URLByAppendingPathComponent("IosCanvasTest.png")!!.path!!
-        val data = UIImagePNGRepresentation(image)!!
-        data.writeToFile(filePath, false)
-    }
-}

core/src/iosTest/kotlin/org/isoron/IosAsyncTests.kt

@@ -21,22 +21,11 @@ package org.isoron
 
 import kotlinx.coroutines.*
 import org.isoron.platform.io.*
-import org.isoron.uhabits.models.*
 import kotlin.test.*
 
 class IosAsyncTests {
     @Test
-    fun testFiles() = runBlocking { FilesTest().testLines() }
+    fun testFiles() = runBlocking {
-
+        FilesTest(IosFileOpener()).testLines()
-//    @Test
+    }
-//    fun testDatabase() = runBlocking { DatabaseTest().testUsage() }
-//
-//    @Test
-//    fun testCheckmarkRepository() = runBlocking { CheckmarkRepositoryTest().testCRUD() }
-//
-//    @Test
-//    fun testHabitRepository() = runBlocking { HabitRepositoryTest().testCRUD() }
-//
-//    @Test
-//    fun testPreferencesRepository() = runBlocking { PreferencesRepositoryTest().testUsage() }
 }

core/src/jsTest/kotlin/org/isoron/JsAsyncTests.kt

@@ -1,42 +0,0 @@
-/*
- * Copyright (C) 2016-2019 Álinson Santos Xavier <isoron@gmail.com>
- *
- * This file is part of Loop Habit Tracker.
- *
- * Loop Habit Tracker is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by the
- * Free Software Foundation, either version 3 of the License, or (at your
- * option) any later version.
- *
- * Loop Habit Tracker is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-package org.isoron
-
-import kotlinx.coroutines.*
-import org.isoron.platform.io.*
-import org.isoron.uhabits.models.*
-import kotlin.test.*
-
-class JsAsyncTests {
-    @Test
-    fun testFiles() = GlobalScope.promise { FilesTest().testLines() }
-
-    @Test
-    fun testDatabase() = GlobalScope.promise { DatabaseTest().testUsage() }
-
-    @Test
-    fun testCheckmarkRepository() = GlobalScope.promise { CheckmarkRepositoryTest().testCRUD() }
-
-    @Test
-    fun testHabitRepository() = GlobalScope.promise { HabitRepositoryTest().testCRUD() }
-
-    @Test
-    fun testPreferencesRepository() = GlobalScope.promise { PreferencesRepositoryTest().testUsage() }
-}

core/src/jsTest/kotlin/org/isoron/platform/JsAsyncTests.kt

@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2016-2019 Álinson Santos Xavier <isoron@gmail.com>
+ *
+ * This file is part of Loop Habit Tracker.
+ *
+ * Loop Habit Tracker is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * Loop Habit Tracker is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.isoron
+
+import kotlinx.coroutines.*
+import org.isoron.platform.io.*
+import org.isoron.uhabits.*
+import org.isoron.uhabits.models.*
+import kotlin.test.*
+
+class JsAsyncTests {
+    var fs: JsFileStorage? = null
+
+    suspend fun getFileOpener(): FileOpener {
+        if (fs == null) {
+            fs = JsFileStorage()
+            fs?.init()
+        }
+        return JsFileOpener(fs!!)
+    }
+
+    suspend fun getDatabase(): Database {
+        val nativeDB = eval("new SQL.Database()")
+        val db = JsDatabase(nativeDB)
+        db.migrateTo(LOOP_DATABASE_VERSION, getFileOpener(), StandardLog())
+        return db
+    }
+
+    @Test
+    fun testFiles() = GlobalScope.promise {
+        FilesTest(getFileOpener()).testLines()
+    }
+
+    @Test
+    fun testDatabase() = GlobalScope.promise {
+        DatabaseTest(getDatabase()).testUsage()
+    }
+
+    @Test
+    fun testCheckmarkRepository() = GlobalScope.promise {
+        CheckmarkRepositoryTest(getDatabase()).testCRUD()
+    }
+
+    @Test
+    fun testHabitRepository() = GlobalScope.promise {
+        HabitRepositoryTest(getDatabase()).testCRUD()
+    }
+
+    @Test
+    fun testPreferencesRepository() = GlobalScope.promise {
+        PreferencesRepositoryTest(getDatabase()).testUsage()
+    }
+}

core/src/jsTest/kotlin/org/isoron/platform/JsCanvasTest.kt

@@ -17,41 +17,25 @@
  * with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-package org.isoron
+package org.isoron.platform
 
 import org.isoron.platform.gui.*
-import org.isoron.platform.io.*
-import org.isoron.uhabits.*
 import org.w3c.dom.*
 import kotlin.browser.*
+import kotlin.test.*
 
-actual class DependencyResolver {
+class JsCanvasTest : CanvasTest.Platform {
-
+    override fun createCanvas(width: Int, height: Int): Canvas {
-    var fs: JsFileStorage? = null
-
-    actual suspend fun getFileOpener(): FileOpener {
-        if (fs == null) {
-            fs = JsFileStorage()
-            fs?.init()
-        }
-        return JsFileOpener(fs!!)
-    }
-
-    actual suspend fun getDatabase(): Database {
-        val nativeDB = eval("new SQL.Database()")
-        val db = JsDatabase(nativeDB)
-        db.migrateTo(LOOP_DATABASE_VERSION, getFileOpener(), StandardLog())
-        return db
-    }
-
-    actual fun createCanvas(width: Int, height: Int): Canvas {
         val canvasElement = document.getElementById("canvas") as HTMLCanvasElement
         canvasElement.style.width = "${width}px"
         canvasElement.style.height = "${height}px"
         return HtmlCanvas(canvasElement)
     }
 
-    actual fun exportCanvas(canvas: Canvas, filename: String) {
+    override fun exportCanvas(canvas: Canvas, filename: String) {
         // do nothing
     }
+
+    @Test
+    fun testDrawing() = CanvasTest(this).run()
 }

core/src/jvmMain/kotlin/org/isoron/platform/io/JavaDatabase.kt

@@ -92,7 +92,7 @@ class JavaDatabase(private var conn: Connection,
     }
 }
 
-class JavaDatabaseOpener(private val log: Log) : DatabaseOpener {
+class JavaDatabaseOpener(val log: Log) : DatabaseOpener {
     override fun open(file: UserFile): Database {
         val platformFile = file as JavaUserFile
         val conn = DriverManager.getConnection("jdbc:sqlite:${platformFile.path}")

core/src/jvmTest/kotlin/org/isoron/JavaAsyncTests.kt

@@ -21,22 +21,46 @@ package org.isoron
 
 import kotlinx.coroutines.*
 import org.isoron.platform.io.*
+import org.isoron.uhabits.*
 import org.isoron.uhabits.models.*
 import org.junit.*
 
 class JavaAsyncTests {
+
+    val log = StandardLog()
+    val fileOpener = JavaFileOpener()
+    val databaseOpener = JavaDatabaseOpener(log)
+
+    suspend fun getDatabase(): Database {
+        val dbFile = fileOpener.openUserFile("test.sqlite3")
+        if (dbFile.exists()) dbFile.delete()
+        val db = databaseOpener.open(dbFile)
+        db.migrateTo(LOOP_DATABASE_VERSION, fileOpener, log)
+        return db
+    }
+
     @Test
-    fun testFiles() = runBlocking { FilesTest().testLines() }
+    fun testFiles() = runBlocking {
+        FilesTest(fileOpener).testLines()
+    }
 
     @Test
-    fun testDatabase() = runBlocking { DatabaseTest().testUsage() }
+    fun testDatabase() = runBlocking {
+        DatabaseTest(getDatabase()).testUsage()
+    }
 
     @Test
-    fun testCheckmarkRepository() = runBlocking { CheckmarkRepositoryTest().testCRUD() }
+    fun testCheckmarkRepository() = runBlocking {
+        CheckmarkRepositoryTest(getDatabase()).testCRUD()
+    }
 
     @Test
-    fun testHabitRepository() = runBlocking { HabitRepositoryTest().testCRUD() }
+    fun testHabitRepository() = runBlocking {
+        HabitRepositoryTest(getDatabase()).testCRUD()
+    }
 
     @Test
-    fun testPreferencesRepository() = runBlocking { PreferencesRepositoryTest().testUsage() }
+    fun testPreferencesRepository() = runBlocking {
+        PreferencesRepositoryTest(getDatabase()).testUsage()
+    }
 }

core/src/jvmTest/kotlin/org/isoron/platform/JavaCanvasTest.kt

@@ -17,39 +17,25 @@
  * with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-package org.isoron
+package org.isoron.platform
 
-import kotlinx.coroutines.*
 import org.isoron.platform.gui.*
-import org.isoron.platform.io.*
+import org.junit.*
-import org.isoron.uhabits.*
 import java.awt.image.*
 import java.io.*
 import javax.imageio.*
 
-actual class DependencyResolver actual constructor() {
+class JavaCanvasTest : CanvasTest.Platform {
-
+    override fun createCanvas(width: Int, height: Int): Canvas {
-    val log = StandardLog()
-    val fileOpener = JavaFileOpener()
-    val databaseOpener = JavaDatabaseOpener(log)
-
-    actual suspend fun getFileOpener(): FileOpener = fileOpener
-
-    actual suspend fun getDatabase(): Database {
-        val dbFile = fileOpener.openUserFile("test.sqlite3")
-        if (dbFile.exists()) dbFile.delete()
-        val db = databaseOpener.open(dbFile)
-        db.migrateTo(LOOP_DATABASE_VERSION, fileOpener, log)
-        return db
-    }
-
-    actual fun createCanvas(width: Int, height: Int): Canvas {
         val image = BufferedImage(width, height, BufferedImage.TYPE_INT_RGB)
         return JavaCanvas(image, pixelScale = 1.0)
     }
 
-    actual fun exportCanvas(canvas: Canvas, filename: String) {
+    override fun exportCanvas(canvas: Canvas, filename: String) {
         val javaCanvas = canvas as JavaCanvas
         ImageIO.write(javaCanvas.image, "png", File("/tmp/$filename"))
     }
+
+    @Test
+    fun testDrawing() = CanvasTest(this).run()
 }

ios/Application/AppDelegate.swift

@@ -19,27 +19,36 @@
 
 import UIKit
 
-@UIApplicationMain class AppDelegate: UIResponder, UIApplicationDelegate {
+@UIApplicationMain class AppDelegate: UIResponder, UIApplicationDelegate, BackendListener {
    
     var window: UIWindow?
-    var backend = Backend(databaseName: "dev.db",
+    var nav: UINavigationController?
-                          databaseOpener: IosDatabaseOpener(withLog: StandardLog()),
+    let log = StandardLog()
-                          fileOpener: IosFileOpener(),
+    var backend: Backend?
-                          localeHelper: IosLocaleHelper(NSLocale.preferredLanguages),
-                          log: StandardLog(),
-                          taskRunner: SequentialTaskRunner())
     
     func application(_ application: UIApplication,
                      didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
         
+        backend = Backend(databaseName: "uhabits.db",
+                          databaseOpener: IosDatabaseOpener(withLog: log),
+                          fileOpener: IosFileOpener(),
+                          localeHelper: IosLocaleHelper(NSLocale.preferredLanguages),
+                          log: log,
+                          crCtx: UIDispatcher())
+        
+        backend?.observable.addListener(listener: self)
+        backend?.doInit()
+        
         window = UIWindow(frame: UIScreen.main.bounds)
-        if let window = window {
+        nav = UINavigationController()
-            let nav = UINavigationController()
+        window?.backgroundColor = UIColor.white
-            nav.viewControllers = [MainScreenController(withBackend: backend)]
+        window?.rootViewController = nav
-            window.backgroundColor = UIColor.white
+        window?.makeKeyAndVisible()
-            window.rootViewController = nav
+        
-            window.makeKeyAndVisible()
-        }
         return true
     }
+    
+    func onReady() {
+        nav?.viewControllers = [MainScreenController(withBackend: backend!)]
+    }
 }

ios/Application/Frontend/MainScreenController.swift

@@ -100,7 +100,7 @@ class MainScreenController: UITableViewController, MainScreenDataSourceListener
     var preferences: Preferences
     var theme: Theme
     var nButtons = 3
-    var strings: Strings
+    var strings = Strings()
     
     required init?(coder aDecoder: NSCoder) {
         fatalError()
@@ -109,9 +109,9 @@ class MainScreenController: UITableViewController, MainScreenDataSourceListener
     init(withBackend backend:Backend) {
         self.backend = backend
         self.strings = backend.strings
-        self.dataSource = backend.mainScreenDataSource!
+        self.dataSource = backend.mainScreenDataSource
         self.theme = backend.theme
-        self.preferences = backend.preferences!
+        self.preferences = backend.preferences
         super.init(nibName: nil, bundle: nil)
         self.dataSource.observable.addListener(listener: self)
         self.dataSource.requestData()

ios/Application/Platform/IosDatabase.swift

@@ -124,7 +124,7 @@ class IosDatabaseOpener : NSObject, DatabaseOpener {
   }
   
   func open(file: UserFile) -> Database {
-    let dbPath = (file as! IosUserFile).path
+    let dbPath = (file as! IosFile).path
     
     let version = String(cString: sqlite3_libversion())
     log.info(tag: "IosDatabaseOpener", msg: "SQLite \(version)")

ios/Tests/Platform/IosDatabaseTest.swift

@@ -26,9 +26,6 @@ class IosDatabaseTest: XCTestCase {
         let fileOpener = IosFileOpener()
 
         let dbFile = fileOpener.openUserFile(path: "test.sqlite3")
-        if dbFile.exists() {
-            dbFile.delete()
-        }
         let db = databaseOpener.open(file: dbFile)
 
         var stmt = db.prepareStatement(sql: "drop table if exists demo")
@@ -68,6 +65,5 @@ class IosDatabaseTest: XCTestCase {
         stmt.finalize()
 
         db.close()
-        dbFile.delete()
     }
 }

ios/uhabits.xcodeproj/project.pbxproj

@@ -7,6 +7,7 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		001592642260AE0F00D2814F /* main.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 00C0C6C92246E543003D8AF0 /* main.framework */; };
 		006EFE4E2252EA2B008464E0 /* IosLocale.swift in Sources */ = {isa = PBXBuildFile; fileRef = 006EFE4D2252EA2B008464E0 /* IosLocale.swift */; };
 		006EFE50225432B8008464E0 /* AboutScreenController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 006EFE4F225432B8008464E0 /* AboutScreenController.swift */; };
 		00A5B42822009F590024E00C /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 00A5B42722009F590024E00C /* AppDelegate.swift */; };
@@ -18,7 +19,6 @@
 		00C0C6BE22465F65003D8AF0 /* databases in Resources */ = {isa = PBXBuildFile; fileRef = 00C0C6BB22465F65003D8AF0 /* databases */; };
 		00C0C6BF22465F65003D8AF0 /* migrations in Resources */ = {isa = PBXBuildFile; fileRef = 00C0C6BC22465F65003D8AF0 /* migrations */; };
 		00C0C6CA2246E543003D8AF0 /* main.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 00C0C6C92246E543003D8AF0 /* main.framework */; };
-		00C0C6CB2246E543003D8AF0 /* main.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 00C0C6C92246E543003D8AF0 /* main.framework */; };
 		00C0C6CC2246E550003D8AF0 /* main.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 00C0C6C92246E543003D8AF0 /* main.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
 		00C0C6CE2246EFB3003D8AF0 /* IosExtensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 00C0C6CD2246EFB3003D8AF0 /* IosExtensions.swift */; };
 		00C0C6D122470705003D8AF0 /* IosCanvas.swift in Sources */ = {isa = PBXBuildFile; fileRef = 00C0C6D022470705003D8AF0 /* IosCanvas.swift */; };
@@ -94,7 +94,7 @@
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				00C0C6CB2246E543003D8AF0 /* main.framework in Frameworks */,
+				001592642260AE0F00D2814F /* main.framework in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -498,6 +498,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
 				SWIFT_OBJC_BRIDGING_HEADER = Application/BridgingHeader.h;
+				SWIFT_PRECOMPILE_BRIDGING_HEADER = NO;
 				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
@@ -525,6 +526,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
 				SWIFT_OBJC_BRIDGING_HEADER = Application/BridgingHeader.h;
+				SWIFT_PRECOMPILE_BRIDGING_HEADER = NO;
 				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
@@ -547,6 +549,8 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = org.isoron.uhabitsTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_OBJC_BRIDGING_HEADER = "";
+				SWIFT_PRECOMPILE_BRIDGING_HEADER = NO;
 				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/uhabits.app/uhabits";
@@ -570,6 +574,8 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = org.isoron.uhabitsTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_OBJC_BRIDGING_HEADER = "";
+				SWIFT_PRECOMPILE_BRIDGING_HEADER = NO;
 				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/uhabits.app/uhabits";

web/src/test/index.html

@@ -12,8 +12,8 @@
     </style>
   </head>
   <body>
+    <canvas id="canvas" width=500 height=400 style="display: none"></canvas>
     <div id="mocha"></div>
-    <canvas id="canvas" style="width: 500px; height: 400px; display: none;"></canvas>
     <script src="../lib/mocha.js"></script>
     <script>mocha.setup('bdd')</script>
     <script src="../test.js"></script>