scribe-org#292 fix UILexicon not loading into keyboard

Keyboards/KeyboardsBase/LanguageDBManager.swift

@@ -23,17 +23,33 @@ import SwiftyJSON
 
 class LanguageDBManager {
   static let shared = LanguageDBManager()
-  private lazy var languageDB = openDBQueue()
+  private var languageDB: DatabaseQueue?
 
-  private init() {}
+  private init() {
+    languageDB = openDBQueue()
+  }
 
   /// Makes a connection to the language database given the value for controllerLanguage.
   private func openDBQueue() -> DatabaseQueue {
     let dbName = "\(String(describing: get_iso_code(keyboardLanguage: controllerLanguage).uppercased()))LanguageData"
-    let dbPath = Bundle.main.path(forResource: dbName, ofType: "sqlite")!
-    let dbQueue = try! DatabaseQueue(path: dbPath)
-
-    return dbQueue
+    let dbResourcePath = Bundle.main.path(forResource: dbName, ofType: "sqlite")!
+    let fileManager = FileManager.default
+    do {
+      let dbPath = try fileManager
+        .url(for: .applicationSupportDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
+        .appendingPathComponent("\(dbName).sqlite")
+        .path
+      if fileManager.fileExists(atPath: dbPath) {
+        try fileManager.removeItem(atPath: dbPath)
+      }
+      try fileManager.copyItem(atPath: dbResourcePath, toPath: dbPath)
+      let dbQueue = try DatabaseQueue(path: dbPath)
+      return dbQueue
+    } catch {
+      print("An error occurred: UILexicon not available")
+      let dbQueue = try! DatabaseQueue(path: dbResourcePath)
+      return dbQueue
+    }
   }
 
   /// Loads a JSON file that contains grammatical information into a dictionary.
@@ -56,7 +72,7 @@ class LanguageDBManager {
   private func queryDBRow(query: String, outputCols: [String], args: StatementArguments) -> [String] {
     var outputValues = [String]()
     do {
-      try languageDB.read { db in
+      try languageDB?.read { db in
         if let row = try Row.fetchOne(db, sql: query, arguments: args) {
           for col in outputCols {
             outputValues.append(row[col])
@@ -89,6 +105,7 @@ class LanguageDBManager {
   private func queryDBRows(query: String, outputCols _: [String], args: StatementArguments) -> [String] {
     var outputValues = [String]()
     do {
+      guard let languageDB = languageDB else { return [] }
       let rows = try languageDB.read { db in
         try Row.fetchAll(db, sql: query, arguments: args)
       }
@@ -119,7 +136,7 @@ class LanguageDBManager {
   ///   - args: arguments to pass to `query`.
   private func writeDBRow(query: String, args: StatementArguments) {
     do {
-      try languageDB.write { db in
+      try languageDB?.write { db in
         try db.execute(sql: query, arguments: args)
       }
     } catch let error as DatabaseError {
@@ -139,7 +156,7 @@ class LanguageDBManager {
   ///   - args: arguments to pass to `query`.
   private func deleteDBRow(query: String, args: StatementArguments? = nil) {
     do {
-      try languageDB.write { db in
+      try languageDB?.write { db in
         guard let args = args else {
           try db.execute(sql: query)
           return