Add capabilities for detecting app extensions and host targets

CHANGELOG.md

@@ -4,6 +4,11 @@
 
 ##### Enhancements
 
+* Add helpers to `Project` for finding an extension target's host targets
+  and a host target's extension targets.  
+  [Ben Asher](https://github.com/benasher44)
+  [#382](https://github.com/CocoaPods/Xcodeproj/pull/382)
+
 * Add accessors for working with skipped tests inside TestAction  in `.xcscheme` files.  
   [Eduard Panasiuk](https://github.com/somedev)
   [#380](https://github.com/CocoaPods/Xcodeproj/pull/380)

lib/xcodeproj/project.rb

@@ -526,6 +526,40 @@ def native_targets
       root_object.targets.grep(PBXNativeTarget)
     end
 
+    # Checks the native target for any targets in the project that are
+    # extensions of that target
+    #
+    # @param  [PBXNativeTarget] native target to check for extensions
+    #
+    #
+    # @return [Array<PBXNativeTarget>] A list of all targets that are
+    #         extensions of the passed in target.
+    #
+    def extensions_for_native_target(native_target)
+      return [] if native_target.extension_target_type?
+      native_targets.select do |target|
+        next unless target.extension_target_type?
+        host_targets_for_extension_target(target).map(&:uuid).include? native_target.uuid
+      end
+    end
+
+    # Returns the native targets, in which the extension target are embedded.
+    # This works by traversing the targets to find those where the extension
+    # target is a dependency.
+    #
+    # @param  [PBXNativeTarget] native target where target.extension_target_type?
+    #                           is true
+    #
+    # @return [Array<PBXNativeTarget>] the native targets that host the extension
+    #
+    def host_targets_for_extension_target(extension_target)
+      raise ArgumentError, "#{extension_target} is not an extension" unless extension_target.extension_target_type?
+      native_targets.select do |native_target|
+        ((extension_target.uuid != native_target.uuid) &&
+         (native_target.dependencies.map(&:target).map(&:uuid).include? extension_target.uuid))
+      end
+    end
+
     # @return [PBXGroup] The group which holds the product file references.
     #
     def products_group

spec/fixtures/Sample Project/Extensions/Extensions WatchKit 1 App/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,62 @@
+{
+  "images" : [
+    {
+      "size" : "24x24",
+      "idiom" : "watch",
+      "scale" : "2x",
+      "role" : "notificationCenter",
+      "subtype" : "38mm"
+    },
+    {
+      "size" : "27.5x27.5",
+      "idiom" : "watch",
+      "scale" : "2x",
+      "role" : "notificationCenter",
+      "subtype" : "42mm"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "watch",
+      "role" : "companionSettings",
+      "scale" : "2x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "watch",
+      "role" : "companionSettings",
+      "scale" : "3x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "watch",
+      "scale" : "2x",
+      "role" : "appLauncher",
+      "subtype" : "38mm"
+    },
+    {
+      "size" : "44x44",
+      "idiom" : "watch",
+      "scale" : "2x",
+      "role" : "longLook",
+      "subtype" : "42mm"
+    },
+    {
+      "size" : "86x86",
+      "idiom" : "watch",
+      "scale" : "2x",
+      "role" : "quickLook",
+      "subtype" : "38mm"
+    },
+    {
+      "size" : "98x98",
+      "idiom" : "watch",
+      "scale" : "2x",
+      "role" : "quickLook",
+      "subtype" : "42mm"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

spec/fixtures/Sample Project/Extensions/Extensions WatchKit 1 App/Base.lproj/Interface.storyboard

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder.WatchKit.Storyboard" version="3.0" toolsVersion="6221" systemVersion="13E28" targetRuntime="watchKit" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="AgC-eL-Hgc">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6213"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBWatchKitPlugin" version="3733"/>
+    </dependencies>
+    <scenes>
+        <!--Interface Controller-->
+        <scene sceneID="aou-V4-d1y">
+            <objects>
+                <controller id="AgC-eL-Hgc" customClass="InterfaceController" customModuleProvider="target"/>
+            </objects>
+        </scene>
+    </scenes>
+</document>

spec/fixtures/Sample Project/Extensions/Extensions WatchKit 1 App/Info.plist

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleDisplayName</key>
+	<string>Extensions</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+	</array>
+	<key>WKCompanionAppBundleIdentifier</key>
+	<string>cocoapods.Extensions</string>
+	<key>WKWatchKitApp</key>
+	<true/>
+</dict>
+</plist>

spec/fixtures/Sample Project/Extensions/Extensions WatchKit 1 Extension/Assets.xcassets/README__ignoredByTemplate__

@@ -0,0 +1 @@
+Did you know that git does not support storing empty directories?

spec/fixtures/Sample Project/Extensions/Extensions WatchKit 1 Extension/Info.plist

@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleDisplayName</key>
+	<string>Extensions WatchKit 1 Extension</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>XPC!</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>NSExtension</key>
+	<dict>
+		<key>NSExtensionAttributes</key>
+		<dict>
+			<key>WKAppBundleIdentifier</key>
+			<string>cocoapods.Extensions.watchkitapp</string>
+		</dict>
+		<key>NSExtensionPointIdentifier</key>
+		<string>com.apple.watchkit</string>
+	</dict>
+</dict>
+</plist>

spec/fixtures/Sample Project/Extensions/Extensions WatchKit 1 Extension/InterfaceController.swift

@@ -0,0 +1,31 @@
+//
+//  InterfaceController.swift
+//  Extensions WatchKit 1 Extension
+//
+//  Created by Benjamin Asher on 4/9/16.
+//  Copyright © 2016 CocoaPods. All rights reserved.
+//
+
+import WatchKit
+import Foundation
+
+
+class InterfaceController: WKInterfaceController {
+
+    override func awakeWithContext(context: AnyObject?) {
+        super.awakeWithContext(context)
+
+        // Configure interface objects here.
+    }
+
+    override func willActivate() {
+        // This method is called when watch view controller is about to be visible to user
+        super.willActivate()
+    }
+
+    override func didDeactivate() {
+        // This method is called when watch view controller is no longer visible
+        super.didDeactivate()
+    }
+
+}