Use the new Decodable Swift protocol to handle options

Fixes #8

README.md

@@ -86,8 +86,8 @@ Number of frames per seconds.
 
 ##### cropArea
 
-Type: `Object` `string`<br>
-Default: `'none'`
+Type: `Object`<br>
+Default: `null`
 
 Record only an area of the screen. Accepts an object with `x`, `y`, `width`, `height` properties.
 
@@ -116,8 +116,8 @@ Display to record.
 
 ##### audioSourceId
 
-Type: `Object` `string`<br>
-Default: `'none'`
+Type: `string`<br>
+Default: `null`
 
 Audio source to include in the screen recording. Should be one of the `id`'s from `aperture.getAudioSources()`.
 

index.js

@@ -15,24 +15,24 @@ class Aperture {
 
   startRecording({
     fps = 30,
-    cropArea = 'none',
+    cropArea = undefined,
     showCursor = true,
     highlightClicks = false,
     displayId = 'main',
-    audioSourceId = 'none'
+    audioSourceId = undefined
   } = {}) {
     return new Promise((resolve, reject) => {
       if (this.recorder !== undefined) {
         reject(new Error('Call `.stopRecording()` first'));
         return;
       }
 
+      this.tmpPath = tempy.file({extension: 'mp4'});
+
       if (highlightClicks === true) {
         showCursor = true;
       }
 
-      this.tmpPath = tempy.file({extension: 'mp4'});
-
       if (typeof cropArea === 'object') {
         if (typeof cropArea.x !== 'number' ||
             typeof cropArea.y !== 'number' ||
@@ -41,21 +41,19 @@ class Aperture {
           reject(new Error('Invalid `cropArea` option object'));
           return;
         }
-
-        cropArea = `${cropArea.x}:${cropArea.y}:${cropArea.width}:${cropArea.height}`;
       }
 
-      const recorderOpts = [
-        this.tmpPath,
+      const recorderOpts = {
+        destination: this.tmpPath,
         fps,
         cropArea,
         showCursor,
         highlightClicks,
         displayId,
-        audioSourceId
-      ];
+        audioDeviceId: audioSourceId
+      };
 
-      this.recorder = execa(BIN, recorderOpts);
+      this.recorder = execa(BIN, [JSON.stringify(recorderOpts)]);
 
       const timeout = setTimeout(() => {
         // `.stopRecording()` was called already

swift/aperture/main.swift

@@ -2,37 +2,51 @@ import Foundation
 import AVFoundation
 
 var recorder: Recorder!
+let arguments = CommandLine.arguments.dropFirst()
 
 func quit(_: Int32) {
   recorder.stop()
 }
 
-func record() throws {
-  // TODO: Use JSON and `Codable` here when Swift 4 is out
+struct CropArea: Decodable {
+  let x: CGFloat
+  let y: CGFloat
+  let width: CGFloat
+  let height: CGFloat
+}
+
+struct Options: Decodable {
+  let destination: String // TODO: Figure out a way to make this decodable into an `URL`
+  let fps: Int
+  let cropArea: CropArea? // TODO: Figure out a way to make this decodable into a `CGRect`
+  let showCursor: Bool
+  let highlightClicks: Bool
+  let displayId: String
+  let audioDeviceId: String?
+}
 
-  let args = CommandLine.arguments
-  let destination = args[1]
-  let fps = args[2]
-  let cropArea = args[3]
-  let showCursor = args[4]
-  let highlightClicks = args[5]
-  let displayId = args[6]
-  let audioDeviceId = args[7]
+func record() throws {
+  let json = arguments.first!.data(using: .utf8)!
+  let options = try JSONDecoder().decode(Options.self, from: json)
 
   var cropRect: CGRect?
-  if cropArea != "none" {
-    let points = cropArea.components(separatedBy: ":").map { Double($0)! }
-    cropRect = CGRect(x: points[0], y: points[1], width: points[2], height: points[3])
+  if let cropArea = options.cropArea {
+    cropRect = CGRect(
+      x: cropArea.x,
+      y: cropArea.y,
+      width: cropArea.width,
+      height: cropArea.height
+    )
   }
 
   recorder = try Recorder(
-    destination: URL(fileURLWithPath: destination),
-    fps: Int(fps)!,
+    destination: URL(fileURLWithPath: options.destination),
+    fps: options.fps,
     cropRect: cropRect,
-    showCursor: showCursor == "true",
-    highlightClicks: highlightClicks == "true",
-    displayId: displayId == "main" ? CGMainDisplayID() : CGDirectDisplayID(displayId)!,
-    audioDevice: audioDeviceId == "none" ? nil : .default(for: .audio)
+    showCursor: options.showCursor,
+    highlightClicks: options.highlightClicks,
+    displayId: options.displayId == "main" ? CGMainDisplayID() : CGDirectDisplayID(options.displayId)!,
+    audioDevice: options.audioDeviceId != nil ? AVCaptureDevice(uniqueID: options.audioDeviceId!) : .default(for: .audio)
   )
 
   recorder.onStart = {
@@ -70,16 +84,14 @@ func usage() {
   )
 }
 
-let numberOfArgs = CommandLine.arguments.count
-
-if numberOfArgs == 8 {
-  try record()
+if arguments.first == "list-audio-devices" {
+  // Use stderr because of unrelated stuff being outputted on stdout
+  printErr(try toJson(DeviceList.audio()))
   exit(0)
 }
 
-if numberOfArgs == 2 && CommandLine.arguments[1] == "list-audio-devices" {
-  // Use stderr because of unrelated stuff being outputted on stdout
-  printErr(try toJson(DeviceList.audio()))
+if arguments.first != nil {
+  try record()
   exit(0)
 }