Add a factory method for convenience (benski#5)

* Add factory method
* Chaining
* Fix typo

Author: taichino

.gitignore

@@ -16,6 +16,8 @@ DerivedData
 *.hmap
 *.ipa
 *.xcuserstate
+.DS_Store
+Podfile.lock
 
 # CocoaPods
 #

BAPromise.xcodeproj/project.pbxproj

@@ -0,0 +1,45 @@
+//
+//  HelperTests.swift
+//  BAPromise
+//
+//  Created by Taichi Matsumoto on 12/28/16.
+//  Copyright © 2016 Ben Allison. All rights reserved.
+//
+
+import XCTest
+import BAPromise
+
+class HelperTests: XCTestCase {
+    
+    override func setUp() {
+        super.setUp()
+    }
+    
+    override func tearDown() {
+        super.tearDown()
+    }
+    
+    func testFulfillWithFactoryMethod() {
+        let expectation = XCTestExpectation()
+        
+        BAPromiseClient<NSString>.promise({fulfill, reject in
+            fulfill("Success" as NSString)
+        }).then { value in
+            expectation.fulfill()
+        }.rejected { error in
+            XCTFail("the promise should never be rejected")
+        }
+    }
+    
+    func testRejectWithFactoryMethod() {
+        let expectation = XCTestExpectation()
+        
+        BAPromiseClient<NSString>.promise({fulfill, reject in
+            reject(NSError(domain: "promise test", code: 0, userInfo: nil))
+        }).then { value in
+            XCTFail("the promise should never be fulfilled")
+        }.rejected { error in
+            expectation.fulfill()
+        }
+    }
+}

BAPromiseTests/HelperTests.swift

@@ -87,6 +87,10 @@ typedef dispatch_block_t BAPromiseFinallyBlock;
 +(instancetype)fulfilledPromise:(T)obj;
 +(instancetype)rejectedPromise:(NSError *)error;
 
+// Unfortunate signature thanks to objc fukcing block syntax.
+// This method takes one block "resolver" as a parameter, which takes two blocks "fulfill" and "reject".
++(nonnull instancetype)promiseWithResolver:(void (^ __nonnull)(void (^ __nonnull fulfill)(__nonnull T), void (^ __nonnull reject)(NSError * __nonnull)))resolver NS_SWIFT_NAME(promise(_:));
+
 /* helper methods to streamline syntax for nil objects*/
 -(void)fulfill;
 -(void)reject;

Classes/BAPromise.h

@@ -520,6 +520,18 @@ +(BAPromiseClient *)rejectedPromise:(NSError *)error
     return promise;
 }
 
++(instancetype)promiseWithResolver:(void (^)(void (^fulfill)(id), void (^reject)(NSError *)))resolver
+{
+    BAPromiseClient *promise = [[BAPromiseClient alloc] init];
+    resolver(^(id obj) {
+                 [promise fulfillWithObject:obj];
+             },
+             ^(NSError *error) {
+                 [promise rejectWithError:error];
+             });
+    return promise;
+}
+
 -(void)fulfillWithObject:(id)obj
 {
     if ([obj isKindOfClass:[BAPromise class]]) {

Classes/BAPromise.m

@@ -0,0 +1,4 @@
+//
+//  Use this file to import your target's public headers that you would like to expose to Swift.
+//
+

OS XTests-Bridging-Header.h

@@ -1,10 +1,12 @@
 xcodeproj 'BAPromise'
+use_frameworks!
 
 target 'iOS' do
-	platform :ios, '8.0'
-	target 'iOSTests' do
-		pod "OCMock"
-	end
+  platform :ios, '8.0'
+  pod "BAPromise"  , :path => "."
+  target 'iOSTests' do
+	pod "OCMock"
+  end
 end
 
 target 'OS X' do