Add a method to enumerate a repository's references.

Author: tiennou

Classes/GTRepository.h

@@ -187,6 +187,17 @@ extern NSString *const GTRepositoryCloneOptionsCredentialProvider;
 // returns nil if an error occurred and fills the error parameter
 - (NSArray *)referenceNamesWithError:(NSError **)error;
 
+// Enumerate over all references is the repository.
+//
+// error - If not NULL, this pointer will be set to the actual error that occurred.
+// block - A block which will be called for each reference. You will be passed
+//         the reference object in `ref`, `error` will be set to something if `ref`
+//         is nil, and `stop` will stop the enumeration if it's set to YES.
+//
+// Returns YES if enumeration was successful, NO otherwise (and the `error`
+// parameter will be set to the actual error that occurred).
+- (BOOL)enumerateReferencesWithError:(NSError **)error usingBlock:(void (^)(GTReference *reference, NSError *error, BOOL *stop))block;
+
 - (GTReference *)headReferenceWithError:(NSError **)error;
 
 // Convenience methods to return branches in the repository

Classes/GTRepository.m

@@ -479,6 +479,23 @@ - (NSArray *)referenceNamesWithError:(NSError **)error {
 	return referenceNames;
 }
 
+- (BOOL)enumerateReferencesWithError:(NSError **)error usingBlock:(void (^)(GTReference *reference, NSError *error, BOOL *stop))block {
+	NSArray *references = [self referenceNamesWithError:error];
+	if (!references) return NO;
+
+	for (NSString *refName in references) {
+		NSError *refError;
+		BOOL stop = NO;
+
+		GTReference *ref = [GTReference referenceByLookingUpReferencedNamed:refName inRepository:self error:&refError];
+
+		block(ref, refError, &stop);
+
+		if (stop == YES) break;
+	}
+	return YES;
+}
+
 - (NSURL *)fileURL {
 	const char *path = git_repository_workdir(self.git_repository);
 	// bare repository, you may be looking for gitDirectoryURL