platform support (#9)

- fix build errors for swift 5.6
- support tvos and watchos

Package.swift

@@ -1,11 +1,11 @@
-// swift-tools-version:5.5
+// swift-tools-version:5.6
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription
 
 let package = Package(
     name: "SwiftFileStore",
-    platforms: [.iOS(.v14), .macOS(.v12)],
+    platforms: [.iOS(.v14), .macOS(.v12), .tvOS(.v14), .watchOS(.v8)],
     products: [
         .library(
             name: "SwiftFileStore",

Sources/SwiftFileStore/PersistenceLog.swift

@@ -23,12 +23,21 @@ public actor PersistenceLogImpl<ElementType>: PersistenceLog where ElementType:
     private let dirURL: URL
     private let fileHandle: FileHandle
 
+    #if swift(>=5.7)
     public init(name: String) throws {
         let applicationSupportDir = try FileManager.default.url(for: .applicationSupportDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
         let rootDir = applicationSupportDir.appendingPathComponent("persistence-log", isDirectory: true)
         try FileManager.default.createDirIfNotExist(url: rootDir)
         try self.init(name: name, rootDir: rootDir)
     }
+    #else
+    public convenience init(name: String) throws {
+        let applicationSupportDir = try FileManager.default.url(for: .applicationSupportDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
+        let rootDir = applicationSupportDir.appendingPathComponent("persistence-log", isDirectory: true)
+        try FileManager.default.createDirIfNotExist(url: rootDir)
+        try self.init(name: name, rootDir: rootDir)
+    }
+    #endif
 
     init(name: String, rootDir: URL) throws {
         self.name = name

Tests/SwiftFileStoreTests/PersistenceLogTests.swift

@@ -6,7 +6,7 @@
 import XCTest
 
 final class PersistenceLogTests: XCTestCase {
-    var log: (any TestObjectLog)!
+    var log: PersistenceLogImpl<TestObject>!
 
     func test_append_flush() async throws {
         log = try! PersistenceLogImpl<TestObject>(name: "test-queue")
@@ -18,7 +18,3 @@ final class PersistenceLogTests: XCTestCase {
         XCTAssertEqual(result, [object1, object2])
     }
 }
-
-protocol TestObjectLog: PersistenceLog where Element == TestObject {}
-
-extension PersistenceLogImpl<TestObject>: TestObjectLog {}