Update to latest swift syntax

Icns Composer/DragDropImageView.swift

@@ -72,12 +72,12 @@ class DragDropImageView: NSImageView, NSDraggingSource {
   }
 
   // Track mouse down events and safe the to the poperty.
-  override func mouseDown(_ theEvent: NSEvent) {
+  override func mouseDown(with theEvent: NSEvent) {
     self.mouseDownEvent = theEvent
   }
 
   // Track mouse dragged events to handle dragging sessions.
-  override func mouseDragged(_ theEvent: NSEvent) {
+  override func mouseDragged(with theEvent: NSEvent) {
     // Calculate the drag distance...
     let mouseDown    = self.mouseDownEvent!.locationInWindow
     let dragPoint    = theEvent.locationInWindow

Icns Composer/IconImage.swift

@@ -71,7 +71,7 @@ struct IconImage {
   /// - parameter url: The url where to save the image.
   func writeToURL(_ url: URL) throws {
     // Define the image name.
-    let imgURL = try url.appendingPathComponent(filename, isDirectory: false)
+    let imgURL = url.appendingPathComponent(filename, isDirectory: false)
 
     // Get the png representation of the image and write it to the supplied url.
     if let png = image?.PNGRepresentation() {

Icns Composer/Iconset.swift

@@ -29,7 +29,7 @@
 import Cocoa
 
 
-enum IconsetError: ErrorProtocol {
+enum IconsetError: Error {
   case missingURL
 }
 
@@ -60,18 +60,18 @@ struct Iconset {
     // Create the .icns file.
     try runIconUtilWithInput(tmpURL, andOutputURL: url)
     // Open the working directory.
-    NSWorkspace.shared().open(try url.deletingLastPathComponent())
+    NSWorkspace.shared().open(url.deletingLastPathComponent())
   }
 
   /// Create a new iconset within the user's temporary directory.
   ///
   /// - returns: The URL where the iconset were written to.
-  private func writeToTemporaryDir() throws -> URL {
+  fileprivate func writeToTemporaryDir() throws -> URL {
     // Create a randomly named dictionary.
     let icnSet = "\(Int(arc4random_uniform(99999) + 10000)).iconset/"
     let tmpURL = URL(fileURLWithPath: NSTemporaryDirectory() + icnSet, isDirectory: true)
     // Create the temporary directory.
-    print(tmpURL.path!)
+    print(tmpURL.path)
     try FileManager.default.createDirectory(at: tmpURL, withIntermediateDirectories: true, attributes: nil)
     // Save every single associated image.
     for image in images {
@@ -92,12 +92,12 @@ struct Iconset {
       throw IconsetError.missingURL
     }
     if output.pathExtension != "icns" {
-      output = try output.appendingPathExtension("icns")
+      output = output.appendingPathExtension("icns")
     }
-    let iconUtil = Task()
+    let iconUtil = Process()
     // Configure and launch the Task.
     iconUtil.launchPath = "/usr/bin/iconutil"
-    iconUtil.arguments  = ["-c", "icns", "-o", output.path!, input.path!]
+    iconUtil.arguments  = ["-c", "icns", "-o", output.path, input.path]
     iconUtil.launch()
     iconUtil.waitUntilExit()
     // Delete the temporary iconset