Added a file helper

Author: kpgalligan

sqliter-driver/src/appleMain/kotlin/co/touchlab/sqliter/internal/File.kt

@@ -23,6 +23,9 @@ internal actual class File(dirPath:String?=null, name:String){
 
     actual val path:String
 
+    actual val exists: Boolean
+        get() = exists()
+
     init {
         if (dirPath == null || dirPath.isEmpty()) {
             this.path = fixSlashes(name)

sqliter-driver/src/linuxX64Main/kotlin/co/touchlab/sqliter/internal/File.kt

@@ -23,6 +23,9 @@ internal actual class File(dirPath: String? = null, name: String) {
 
     actual val path: String
 
+    actual val exists: Boolean
+        get() = exists()
+
     init {
         if (dirPath == null || dirPath.isEmpty()) {
             this.path = fixSlashes(name)

sqliter-driver/src/mingwMain/kotlin/co/touchlab/sqliter/internal/File.kt

@@ -24,6 +24,9 @@ internal actual class File(dirPath:String? = null, name:String) {
 
     actual val path: String
 
+    actual val exists: Boolean
+        get() = exists()
+
     init {
         if (dirPath == null || dirPath.isEmpty()) {
             this.path = fixSlashes(name)

sqliter-driver/src/nativeCommonMain/kotlin/co/touchlab/sqliter/DatabaseFileContext.kt

@@ -18,14 +18,16 @@ package co.touchlab.sqliter
 
 import co.touchlab.sqliter.internal.File
 
-expect object DatabaseFileContext{
-    fun deleteDatabase(name: String, basePath:String? = null)
-    fun databasePath(databaseName:String, datapathPath:String?):String
-    internal fun databaseFile(databaseName:String, datapathPath:String?): File
+expect object DatabaseFileContext {
+    fun deleteDatabase(name: String, basePath: String? = null)
+    fun databasePath(databaseName: String, datapathPath: String?): String
+    internal fun databaseFile(databaseName: String, datapathPath: String?): File
 }
 
 
-fun DatabaseFileContext.deleteDatabase(configuration: DatabaseConfiguration){
-    if(configuration.name != null)
+fun DatabaseFileContext.deleteDatabase(configuration: DatabaseConfiguration) {
+    if (configuration.name != null)
         deleteDatabase(configuration.name, configuration.extendedConfig.basePath)
-}
+}
+
+fun DatabaseFileContext.databaseFileExists(name: String, basePath: String? = null): Boolean =  databaseFile(name, basePath).exists

sqliter-driver/src/nativeCommonMain/kotlin/co/touchlab/sqliter/internal/File.kt

@@ -2,4 +2,5 @@ package co.touchlab.sqliter.internal
 
 internal expect class File {
     val path: String
+    val exists: Boolean
 }