Implement database access (with migrations)

ios/uhabitsTest/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>BNDL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+</dict>
+</plist>

ios/uhabitsTest/IosFilesTest.swift

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+/*
+ * 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/>.
+ */
+
+import XCTest
+@testable import uhabits
+
+class IosFilesTest: XCTestCase {
+  func testResourceFiles() {
+    let fileOpener = IosFileOpener()
+    let file = fileOpener.openResourceFile(filename: "migrations/010.sql")
+    let lines = file.readLines()
+    XCTAssertEqual(lines[0], "delete from Score")
+  }
+  
+  func testUserFiles() throws {
+    let fm = FileManager.default
+    let root = try fm.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false).path
+    let path = "\(root)/test.txt"
+    fm.createFile(atPath: path, contents: "Hello world\nThis is line 2".data(using: .utf8), attributes: nil)
+    
+    let fileOpener = IosFileOpener()
+    let file = fileOpener.openUserFile(filename: "test.txt")
+    XCTAssertTrue(file.exists())
+    
+    file.delete()
+    XCTAssertFalse(file.exists())
+  }
+}

ios/uhabitsTest/IosSqlDatabaseTest.swift

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+/*
+ * 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/>.
+ */
+
+import XCTest
+@testable import uhabits
+
+class IosDatabaseTest: XCTestCase {
+    func testUsage() {
+      let databaseOpener = IosDatabaseOpener()
+      let fileOpener = IosFileOpener()
+      
+      let dbFile = fileOpener.openUserFile(filename: "test.sqlite3")
+      if dbFile.exists() {
+        dbFile.delete()
+      }
+      let db = databaseOpener.open(file: dbFile)
+      
+      var stmt = db.prepareStatement(sql: "drop table if exists demo")
+      stmt.step()
+      stmt.finalize()
+      
+      stmt = db.prepareStatement(sql: "begin")
+      stmt.step()
+      stmt.finalize()
+      
+      stmt = db.prepareStatement(sql: "create table if not exists demo(key int, value text)")
+      stmt.step()
+      stmt.finalize()
+      
+      stmt = db.prepareStatement(sql: "insert into demo(key, value) values (?1, ?2)")
+      stmt.bindInt(index: 1, value: 42)
+      stmt.bindText(index: 2, value: "Hello World")
+      stmt.step()
+      stmt.finalize()
+      
+      stmt = db.prepareStatement(sql: "select * from demo where key > ?1")
+      stmt.bindInt(index: 1, value: 10)
+      var result = stmt.step()
+      XCTAssertEqual(result, StepResult.row)
+      XCTAssertEqual(stmt.getInt(index: 0), 42)
+      XCTAssertEqual(stmt.getText(index: 1), "Hello World")
+      result = stmt.step()
+      XCTAssertEqual(result, StepResult.done)
+      stmt.finalize()
+      
+      stmt = db.prepareStatement(sql: "drop table demo")
+      stmt.step()
+      stmt.finalize()
+      
+      stmt = db.prepareStatement(sql: "commit")
+      stmt.step()
+      stmt.finalize()
+      
+      db.close()
+      dbFile.delete()
+    }
+}