[swcomp] Add FileHandle closeCompat() extension

This is the same one used in tests.

Sources/swcomp/Containers/TarCommand.swift

@@ -101,7 +101,7 @@ class TarCommand: Command {
                         return false
                     }
                 }
-                try handle.closeHandleCompat()
+                try handle.closeCompat()
             }
         } else if let outputPath = self.extract {
             guard try isValidOutputDirectory(outputPath, create: true) else {
@@ -153,7 +153,7 @@ class TarCommand: Command {
                         return false
                     }
                 }
-                try handle.closeHandleCompat()
+                try handle.closeCompat()
 
                 for tuple in directoryAttributes {
                     try fileManager.setAttributes(tuple.attributes, ofItemAtPath: tuple.path)
@@ -213,32 +213,16 @@ class TarCommand: Command {
                 var writer = TarWriter(fileHandle: handle, force: self.useFormat ?? .pax)
                 try TarEntry.generateEntries(&writer, inputPath, verbose)
                 try writer.finalize()
-                try handle.closeHandleCompat()
+                try handle.closeCompat()
             }
         }
     }
 
 }
 
-fileprivate extension FileHandle {
-
-    func closeHandleCompat() throws {
-        #if compiler(<5.2)
-            self.closeFile()
-        #else
-            if #available(macOS 10.15.4, iOS 13.4, watchOS 6.2, tvOS 13.4, *) {
-                try self.close()
-            } else {
-                self.closeFile()
-            }
-        #endif
-    }
-
-}
-
 #if os(Linux) || os(Windows)
-@discardableResult
-fileprivate func autoreleasepool<T>(_ block: () throws -> T) rethrows -> T {
-    return try block()
-}
+    @discardableResult
+    fileprivate func autoreleasepool<T>(_ block: () throws -> T) rethrows -> T {
+        return try block()
+    }
 #endif

Sources/swcomp/Extensions/FileHandle+CloseCompat.swift

@@ -0,0 +1,22 @@
+// Copyright (c) 2022 Timofey Solomko
+// Licensed under MIT License
+//
+// See LICENSE for license informations
+
+import Foundation
+
+extension FileHandle {
+
+    func closeCompat() throws {
+        #if compiler(<5.2)
+            self.closeFile()
+        #else
+            if #available(macOS 10.15.4, iOS 13.4, watchOS 6.2, tvOS 13.4, *) {
+                try self.close()
+            } else {
+                self.closeFile()
+            }
+        #endif
+    }
+
+}