Add PromiseKit dependency

- Added PromiseKit dependency

Carthage/Checkouts/PromiseKit/Extensions/UIKit/Sources/UIViewController+AnyPromise.m

@@ -0,0 +1,140 @@
+#import <UIKit/UINavigationController.h>
+#import "UIViewController+AnyPromise.h"
+#import <PromiseKit/PromiseKit.h>
+
+#if PMKImagePickerController
+#import <UIKit/UIImagePickerController.h>
+#endif
+
+@interface PMKGenericDelegate : NSObject <UINavigationControllerDelegate> {
+@public
+    PMKResolver resolve;
+}
++ (instancetype)delegateWithPromise:(AnyPromise **)promise;
+@end
+
+@interface UIViewController ()
+- (AnyPromise*) promise;
+@end
+
+@implementation UIViewController (PromiseKit)
+
+- (AnyPromise *)promiseViewController:(UIViewController *)vc animated:(BOOL)animated completion:(void (^)(void))block {
+    __kindof UIViewController *vc2present = vc;
+    AnyPromise *promise = nil;
+
+    if ([vc isKindOfClass:NSClassFromString(@"MFMailComposeViewController")]) {
+        PMKGenericDelegate *delegate = [PMKGenericDelegate delegateWithPromise:&promise];
+        [vc setValue:delegate forKey:@"mailComposeDelegate"];
+    }
+    else if ([vc isKindOfClass:NSClassFromString(@"MFMessageComposeViewController")]) {
+        PMKGenericDelegate *delegate = [PMKGenericDelegate delegateWithPromise:&promise];
+        [vc setValue:delegate forKey:@"messageComposeDelegate"];
+    }
+#ifdef PMKImagePickerController
+    else if ([vc isKindOfClass:[UIImagePickerController class]]) {
+        PMKGenericDelegate *delegate = [PMKGenericDelegate delegateWithPromise:&promise];
+        [vc setValue:delegate forKey:@"delegate"];
+    }
+#endif
+    else if ([vc isKindOfClass:NSClassFromString(@"SLComposeViewController")]) {
+        PMKResolver resolve;
+        promise = [[AnyPromise alloc] initWithResolver:&resolve];
+        [vc setValue:^(NSInteger result){
+            if (result == 0) {
+                resolve([NSError errorWithDomain:NSCocoaErrorDomain code:NSUserCancelledError userInfo:nil]);
+            } else {
+                resolve(@(result));
+            }
+        } forKey:@"completionHandler"];
+    }
+    else if ([vc isKindOfClass:[UINavigationController class]])
+        vc = [(id)vc viewControllers].firstObject;
+
+    if (!vc) {
+        id userInfo = @{NSLocalizedDescriptionKey: @"nil or effective nil passed to promiseViewController"};
+        id err = [NSError errorWithDomain:PMKErrorDomain code:PMKInvalidUsageError userInfo:userInfo];
+        return [AnyPromise promiseWithValue:err];
+    }
+
+    if (!promise) {
+        if (![vc respondsToSelector:@selector(promise)]) {
+            id userInfo = @{NSLocalizedDescriptionKey: @"ViewController is not promisable"};
+            id err = [NSError errorWithDomain:PMKErrorDomain code:PMKInvalidUsageError userInfo:userInfo];
+            return [AnyPromise promiseWithValue:err];
+        }
+
+        promise = [vc valueForKey:@"promise"];
+
+        if (![promise isKindOfClass:[AnyPromise class]]) {
+            id userInfo = @{NSLocalizedDescriptionKey: @"The promise property is nil or not of type AnyPromise"};
+            id err = [NSError errorWithDomain:PMKErrorDomain code:PMKInvalidUsageError userInfo:userInfo];
+            return [AnyPromise promiseWithValue:err];
+        }
+    }
+
+    if (!promise.pending)
+        return promise;
+
+    [self presentViewController:vc2present animated:animated completion:block];
+
+    promise.ensure(^{
+        [vc2present.presentingViewController dismissViewControllerAnimated:animated completion:nil];
+    });
+
+    return promise;
+}
+
+@end
+
+
+
+@implementation PMKGenericDelegate {
+    id retainCycle;
+}
+
++ (instancetype)delegateWithPromise:(AnyPromise **)promise; {
+    PMKGenericDelegate *d = [PMKGenericDelegate new];
+    d->retainCycle = d;
+    *promise = [[AnyPromise alloc] initWithResolver:&d->resolve];
+    return d;
+}
+
+- (void)mailComposeController:(id)controller didFinishWithResult:(int)result error:(NSError *)error {
+    if (error != nil) {
+        resolve(error);
+    } else if (result == 0) {
+        resolve([NSError errorWithDomain:NSCocoaErrorDomain code:NSUserCancelledError userInfo:nil]);
+    } else {
+        resolve(@(result));
+    }
+    retainCycle = nil;
+}
+
+- (void)messageComposeViewController:(id)controller didFinishWithResult:(int)result {
+    if (result == 2) {
+        id userInfo = @{NSLocalizedDescriptionKey: @"The attempt to save or send the message was unsuccessful."};
+        id error = [NSError errorWithDomain:PMKErrorDomain code:PMKOperationFailed userInfo:userInfo];
+        resolve(error);
+    } else {
+        resolve(@(result));
+    }
+    retainCycle = nil;
+}
+
+#ifdef PMKImagePickerController
+
+- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
+    id img = info[UIImagePickerControllerEditedImage] ?: info[UIImagePickerControllerOriginalImage];
+    resolve(PMKManifold(img, info));
+    retainCycle = nil;
+}
+
+- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
+    resolve([NSError errorWithDomain:NSCocoaErrorDomain code:NSUserCancelledError userInfo:nil]);
+    retainCycle = nil;
+}
+
+#endif
+
+@end