Add/modify convenience methods in PBRevSpecifier

- NSCopying
    - change isEqualTo: to isEqual: so that it works well with NSArray's (containsObject: and removeObject: will use isEqual: instead of pointer equality)
    - add hash to go with isEqual:
    - pre-calculate the isSimpleRef value. The rangeOf... methods are very slow and have a major effect on the tight loop in reloadRefs.

PBGitRepository.m

@@ -397,7 +397,7 @@ NSString* PBGitRepositoryErrorDomain = @"GitXErrorDomain";
 
 	// First check if the branch doesn't exist already
 	for (PBGitRevSpecifier *rev in branches)
-		if ([branch isEqualTo: rev])
+		if ([branch isEqual: rev])
 			return rev;
 
 	NSIndexSet *newIndex = [NSIndexSet indexSetWithIndex:[branches count]];
@@ -412,7 +412,7 @@ NSString* PBGitRepositoryErrorDomain = @"GitXErrorDomain";
 - (BOOL) removeBranch:(PBGitRevSpecifier *)branch
 {
 	for (PBGitRevSpecifier *rev in branches) {
-		if ([branch isEqualTo:rev]) {
+		if ([branch isEqual:rev]) {
 			NSIndexSet *oldIndex = [NSIndexSet indexSetWithIndex:[branches indexOfObject:rev]];
 			[self willChange:NSKeyValueChangeRemoval valuesAtIndexes:oldIndex forKey:@"branches"];
 

PBGitRevSpecifier.h

@@ -9,23 +9,23 @@
 #import <Cocoa/Cocoa.h>
 #import <PBGitRef.h>
 
-@interface PBGitRevSpecifier : NSObject {
+@interface PBGitRevSpecifier : NSObject  <NSCopying> {
 	NSString *description;
 	NSArray *parameters;
 	NSURL *workingDirectory;
+	BOOL isSimpleRef;
 }
 
 - (id) initWithParameters:(NSArray*) params;
 - (id) initWithRef: (PBGitRef*) ref;
 
-- (BOOL) isSimpleRef;
 - (NSString*) simpleRef;
 - (PBGitRef *) ref;
 - (BOOL) hasPathLimiter;
 - (BOOL) hasLeftRight;
 - (NSString *) title;
 
-- (BOOL) isEqualTo: (PBGitRevSpecifier*) other;
+- (BOOL) isEqual: (PBGitRevSpecifier*) other;
 - (BOOL) isAllBranchesRev;
 - (BOOL) isLocalBranchesRev;
 
@@ -35,5 +35,6 @@
 @property(retain)   NSString *description;
 @property(readonly) NSArray *parameters;
 @property(retain)   NSURL *workingDirectory;
+@property(readonly) BOOL isSimpleRef;
 
 @end

PBGitRevSpecifier.m

@@ -12,54 +12,56 @@
 @implementation PBGitRevSpecifier
 
 @synthesize parameters, description, workingDirectory;
+@synthesize isSimpleRef;
 
-- (id) initWithParameters:(NSArray*) params
+
+// internal designated init
+- (id) initWithParameters:(NSArray *)params description:(NSString *)descrip
 {
 	parameters = params;
-	description = nil;
+	description = descrip;
+
+	if (([parameters count] > 1) || ([parameters count] == 0))
+		isSimpleRef =  NO;
+	else {
+		NSString *param = [parameters objectAtIndex:0];
+		if ([param hasPrefix:@"-"] ||
+			[param rangeOfCharacterFromSet:[NSCharacterSet characterSetWithCharactersInString:@"^@{}~:"]].location != NSNotFound ||
+			[param rangeOfString:@".."].location != NSNotFound)
+			isSimpleRef =  NO;
+		else
+			isSimpleRef =  YES;
+	}
+
 	return self;
 }
 
-- (id) initWithRef: (PBGitRef*) ref
+- (id) initWithParameters:(NSArray *)params
 {
-	parameters = [NSArray arrayWithObject: ref.ref];
-	description = ref.shortName;
+	[self initWithParameters:params description:nil];
+	return self;
+}
+
+- (id) initWithRef:(PBGitRef *)ref
+{
+	[self initWithParameters:[NSArray arrayWithObject:ref.ref] description:ref.shortName];
 	return self;
 }
 
 - (id) initWithCoder:(NSCoder *)coder
 {
-	parameters = [coder decodeObjectForKey:@"Parameters"];
-	description = [coder decodeObjectForKey:@"Description"];
+	[self initWithParameters:[coder decodeObjectForKey:@"Parameters"] description:[coder decodeObjectForKey:@"Description"]];
 	return self;
 }
 
 + (PBGitRevSpecifier *)allBranchesRevSpec
 {
-	id revspec = [[PBGitRevSpecifier alloc] initWithParameters:[NSArray arrayWithObject:@"--all"]];
-	[revspec setDescription:@"All branches"];
-	return revspec;
+	return [[PBGitRevSpecifier alloc] initWithParameters:[NSArray arrayWithObject:@"--all"] description:@"All branches"];
 }
 
 + (PBGitRevSpecifier *)localBranchesRevSpec
 {
-	id revspec = [[PBGitRevSpecifier alloc] initWithParameters:[NSArray arrayWithObject:@"--branches"]];
-	[revspec setDescription:@"Local branches"];
-	return revspec;
-}
-
-- (BOOL) isSimpleRef
-{
-	if ([parameters count] > 1)
-		return NO;
-
-	NSString *param = [parameters objectAtIndex:0];
-	if ([param hasPrefix:@"-"] ||
-		[param rangeOfCharacterFromSet:[NSCharacterSet characterSetWithCharactersInString:@"^@{}~:"]].location != NSNotFound ||
-		[param rangeOfString:@".."].location != NSNotFound)
-		return NO;
-
-	return YES;
+	return [[PBGitRevSpecifier alloc] initWithParameters:[NSArray arrayWithObject:@"--branches"] description:@"Local branches"];
 }
 
 - (NSString*) simpleRef
@@ -77,12 +79,12 @@
 	return [PBGitRef refFromString:[self simpleRef]];
 }
 
-- (NSString*) description
+- (NSString *) description
 {
-	if (description)
-		return description;
-	
-	return [parameters componentsJoinedByString:@" "];
+	if (!description)
+		description = [parameters componentsJoinedByString:@" "];
+
+	return description;
 }
 
 - (NSString *) title
@@ -122,27 +124,34 @@
 			return YES;
 	return NO;
 }
-	
-- (BOOL) isEqualTo: (PBGitRevSpecifier*) other
+
+- (BOOL) isEqual:(PBGitRevSpecifier *)other
 {
 	if ([self isSimpleRef] ^ [other isSimpleRef])
 		return NO;
 	
 	if ([self isSimpleRef])
-		return [[[self parameters] objectAtIndex: 0] isEqualToString: [other.parameters objectAtIndex: 0]];
+		return [[[self parameters] objectAtIndex:0] isEqualToString:[other.parameters objectAtIndex:0]];
 
-	return ([[parameters componentsJoinedByString:@" "] isEqualToString: [other.parameters componentsJoinedByString:@" "]] &&
-			 (!description  || [description isEqualToString:other.description]));
+	return [self.description isEqualToString:other.description];
+}
+
+- (NSUInteger) hash
+{
+	if ([self isSimpleRef])
+		return [[[self parameters] objectAtIndex:0] hash];
+
+	return [self.description hash];
 }
 
 - (BOOL) isAllBranchesRev
 {
-	return [self isEqualTo:[PBGitRevSpecifier allBranchesRevSpec]];
+	return [self isEqual:[PBGitRevSpecifier allBranchesRevSpec]];
 }
 
 - (BOOL) isLocalBranchesRev
 {
-	return [self isEqualTo:[PBGitRevSpecifier localBranchesRevSpec]];
+	return [self isEqual:[PBGitRevSpecifier localBranchesRevSpec]];
 }
 
 - (void) encodeWithCoder:(NSCoder *)coder
@@ -150,4 +159,14 @@
 	[coder encodeObject:description forKey:@"Description"];
 	[coder encodeObject:parameters forKey:@"Parameters"];
 }
+
+- (id)copyWithZone:(NSZone *)zone
+{
+    PBGitRevSpecifier *copy = [[[self class] allocWithZone:zone] initWithParameters:[self.parameters copy]];
+    copy.description = [self.description copy];
+	copy.workingDirectory = [self.workingDirectory copy];
+
+    return copy;
+}
+
 @end

PBGitSidebarController.m

@@ -200,7 +200,7 @@
 
 - (void)outlineView:(NSOutlineView *)outlineView willDisplayCell:(PBSourceViewCell *)cell forTableColumn:(NSTableColumn *)tableColumn item:(PBSourceViewItem *)item
 {
-	cell.isCheckedOut = [item.revSpecifier isEqualTo:[repository headRef]];
+	cell.isCheckedOut = [item.revSpecifier isEqual:[repository headRef]];
 
 	[cell setImage:[item icon]];
 }