Add rename

Sources/Path+FileManager.swift

@@ -174,6 +174,13 @@ public extension Path {
         }
         return self
     }
+
+    @discardableResult
+    func rename(_ newname: String) throws -> Path {
+        let newpath = parent/newname
+        try FileManager.default.moveItem(atPath: string, toPath: newpath.string)
+        return newpath
+    }
 }
 
 /// Options for `Path.mkdir(_:)`

Tests/PathTests/PathTests.swift

@@ -165,12 +165,42 @@ class PathTests: XCTestCase {
     }
 
     func testCopyInto() throws {
+        try Path.mktemp { root1 in
+            let bar1 = try root1.join("bar").touch()
+            try Path.mktemp { root2 in
+                let bar2 = try root2.join("bar").touch()
+                XCTAssertThrowsError(try bar1.copy(into: root2))
+                try bar1.copy(into: root2, overwrite: true)
+                XCTAssertTrue(bar1.exists)
+                XCTAssertTrue(bar2.exists)
+            }
+        }
+    }
+
+    func testMoveInto() throws {
+        try Path.mktemp { root1 in
+            let bar1 = try root1.join("bar").touch()
+            try Path.mktemp { root2 in
+                let bar2 = try root2.join("bar").touch()
+                XCTAssertThrowsError(try bar1.move(into: root2))
+                try bar1.move(into: root2, overwrite: true)
+                XCTAssertFalse(bar1.exists)
+                XCTAssertTrue(bar2.exists)
+            }
+        }
+    }
+
+    func testRename() throws {
         try Path.mktemp { root in
-            let bar = try root.join("bar").touch()
-            try Path.mktemp { root in
-                try root.join("bar").touch()
-                XCTAssertThrowsError(try bar.copy(into: root))
-                try bar.copy(into: root, overwrite: true)
+            do {
+                let file = try root.bar.touch()
+                let foo = try file.rename("foo")
+                XCTAssertFalse(file.exists)
+                XCTAssertTrue(foo.isFile)
+            }
+            do {
+                let file = try root.bar.touch()
+                XCTAssertThrowsError(try file.rename("foo"))
             }
         }
     }

Tests/PathTests/XCTestManifests.swift

@@ -15,8 +15,10 @@ extension PathTests {
         ("testJoin", testJoin),
         ("testMkpathIfExists", testMkpathIfExists),
         ("testMktemp", testMktemp),
+        ("testMoveInto", testMoveInto),
         ("testRelativePathCodable", testRelativePathCodable),
         ("testRelativeTo", testRelativeTo),
+        ("testRename", testRename),
     ]
 }