Switch to Commander

Closes #1

Author: kylef

Podfile

@@ -3,6 +3,7 @@ platform :osx, '10.10'
 use_frameworks!
 plugin 'cocoapods-rome'
 
+pod 'Commander', :git => 'https://github.com/kylef/Commander'
 pod 'PathKit', '0.4.0-beta.1'
 pod 'Stencil', :git => 'https://github.com/kylef/Stencil', :branch => 'swift-2.0'
 

Podfile.lock

@@ -1,24 +1,32 @@
 PODS:
+  - Commander (0.1.0)
   - PathKit (0.4.0-beta.1)
   - Stencil (0.2.0):
     - PathKit (~> 0.4.0-beta.1)
 
 DEPENDENCIES:
+  - Commander (from `https://github.com/kylef/Commander`)
   - PathKit (= 0.4.0-beta.1)
   - Stencil (from `https://github.com/kylef/Stencil`, branch `swift-2.0`)
 
 EXTERNAL SOURCES:
+  Commander:
+    :git: https://github.com/kylef/Commander
   Stencil:
     :branch: swift-2.0
     :git: https://github.com/kylef/Stencil
 
 CHECKOUT OPTIONS:
+  Commander:
+    :commit: 12d1c1a104e2067f2cf7dc19a1106fbbfcc95e00
+    :git: https://github.com/kylef/Commander
   Stencil:
     :commit: dcf2611ac24829ffe80cf46894ebc98fdda62e0c
     :git: https://github.com/kylef/Stencil
 
 SPEC CHECKSUMS:
+  Commander: d67100926f8781c33b4cb82aa5d826bad78b4191
   PathKit: dd424f40892d4f60f279c8f2cd82503fc86e4dad
   Stencil: 4214b68cf5a5f24c74c8c6fbbb573e225c490f88
 
-COCOAPODS: 0.39.0.beta.4
+COCOAPODS: 0.38.2

bin/querykit.swift

@@ -1,6 +1,7 @@
 #!/usr/bin/env xcrun swift -F Rome
 
 import CoreData
+import Commander
 import PathKit
 import Stencil
 
@@ -201,26 +202,20 @@ func generate(modelPath:Path, outputPath:Path) {
   }
 }
 
-func usage() {
-  let processName = Process.arguments.first!
-  print("Usage: \(processName) <model> <output-directory>")
-}
-
-func run() {
-  let arguments = Process.arguments
-
-  if arguments.contains("--help") {
-    usage()
-  } else if arguments.contains("--version") {
-    print(version)
-  } else if arguments.count != 3 {
-    usage()
-  } else {
-    let modelPath = Path(arguments[1])
-    let outputPath = Path(arguments[2])
-    generate(modelPath, outputPath: outputPath)
+extension Path: ArgumentConvertible {
+  public init(parser: ArgumentParser) throws {
+    if let path = parser.shift() {
+      self.init(path)
+    } else {
+      throw ArgumentError.MissingValue(argument: nil)
+    }
   }
 }
 
-run()
+command(
+  Argument<Path>("model"),
+  Argument<Path>("output")
+) { model, output in
+  generate(model, outputPath: output)
+}.run(version)