diff --git a/PBCLIProxy.mm b/PBCLIProxy.mm
index aed7967..6c66cd0 100644
--- a/PBCLIProxy.mm
+++ b/PBCLIProxy.mm
@@ -31,7 +31,8 @@
 	// work around an apparent bug with GC and Distributed Objects
 	// I am not familiar with GC though, so perhaps I was doing something wrong.
 	NSURL* url = [NSURL fileURLWithPath:[repositoryPath path]];
-	if (id document = [[PBRepositoryDocumentController sharedDocumentController] openDocumentWithContentsOfURL:url display:YES error:nil]) {
+	NSArray* arguments = [NSArray arrayWithArray:args];
+	if (id document = [[PBRepositoryDocumentController sharedDocumentController] openRepositoryAtLocation: url RevParseArgs: arguments]) {
 		[NSApp activateIgnoringOtherApps:YES];
 		return YES;
 	}
diff --git a/PBGitRepository.h b/PBGitRepository.h
index 98fe88e..5063a3d 100644
--- a/PBGitRepository.h
+++ b/PBGitRepository.h
@@ -32,6 +32,8 @@ extern NSString* PBGitRepositoryErrorDomain;
 + (NSURL*)gitDirForURL:(NSURL*)repositoryURL;
 + (NSURL*)baseDirForURL:(NSURL*)repositoryURL;
 
+- (id) initWithURL: (NSURL*) path andArguments:(NSArray*) array;
+
 @property (readonly) PBGitRevList* revisionList;
 @property (assign) NSArray* branches;
 @property (assign) NSString* currentBranch;
diff --git a/PBGitRepository.m b/PBGitRepository.m
index 43ada1c..b58c660 100644
--- a/PBGitRepository.m
+++ b/PBGitRepository.m
@@ -125,6 +125,16 @@ static NSString* gitPath;
 	return success;
 }
 
+- (id) initWithURL: (NSURL*) path andArguments:(NSArray*) array
+{
+	self = [self init];
+	NSURL* gitDirURL = [PBGitRepository gitDirForURL:path];
+	[self setFileURL: gitDirURL];
+	[self readRefs];
+	[self readCurrentBranch];
+	revisionList = [[PBGitRevList alloc] initWithRepository:self andRevListParameters:array];
+	return self;
+}
 // The fileURL the document keeps is to the .git dir, but that’s pretty
 // useless for display in the window title bar, so we show the directory above
 - (NSString*)displayName
diff --git a/PBRepositoryDocumentController.h b/PBRepositoryDocumentController.h
index 8c9c040..b6d0afd 100644
--- a/PBRepositoryDocumentController.h
+++ b/PBRepositoryDocumentController.h
@@ -14,4 +14,5 @@
 
 }
 
+- (id) openRepositoryAtLocation:(NSURL*) url RevParseArgs:(NSArray*)args;
 @end
diff --git a/PBRepositoryDocumentController.m b/PBRepositoryDocumentController.m
index 0d255ad..11e908c 100644
--- a/PBRepositoryDocumentController.m
+++ b/PBRepositoryDocumentController.m
@@ -29,4 +29,18 @@
 {
 	[super noteNewRecentDocumentURL:[PBGitRepository baseDirForURL:url]];
 }
+
+- (id) openRepositoryAtLocation:(NSURL*) url RevParseArgs:(NSArray*)args
+{
+	id document = [self documentForURL:url];
+	if (!document) {
+		document = [[PBGitRepository alloc] initWithURL:url	andArguments:args];
+		[self addDocument:document];
+		[document makeWindowControllers];
+	} else {
+		// TODO: Add another revwalk specifier and show that.
+	}
+	[document showWindows];
+	return document;
+}
 @end