[File Tree] Significantly improve the watcher

- Switch to fine grained folder and file watching responses
- Navigate the PathNode tree using a fast dictionary of path components
- Quickly refresh the file tree by locating parent nodes to refresh

Signed-off-by: Christopher Snowhill <kode54@gmail.com>

FileTree/FileTreeDataSource.m

@@ -130,34 +130,40 @@ static NSURL *defaultMusicDirectory(void) {
 	                                                          withString:@""
 	                                                             options:NSAnchoredSearch
 	                                                               range:NSMakeRange(0, [path length])] stringByStandardizingPath];
+	if([relativePath isEqualToString:[[self rootURL] path]])
+		relativePath = @"";
 	PathNode *node = rootNode;
 	DLog(@"Root | Relative | Path: %@ | %@ | %@", [[self rootURL] path], relativePath, path);
 	for(NSString *c in [relativePath pathComponents]) {
 		DLog(@"COMPONENT: %@", c);
-		BOOL found = NO;
-		for(PathNode *subnode in [node subpaths]) {
-			if([[[[subnode URL] path] lastPathComponent] isEqualToString:c]) {
-				node = subnode;
-				found = YES;
-			}
-		}
-
-		if(!found) {
-			DLog(@"Not found!");
-			return nil;
-		}
+		PathNode *subnode = [[node subpathsLookup] objectForKey:c];
+		if(!subnode) return nil;
+		node = subnode;
 	}
 
 	return node;
 }
 
-- (void)pathDidChange:(NSString *)path {
+- (void)pathDidChange:(NSString *)path flags:(FSEventStreamEventFlags)flags {
 	DLog(@"PATH DID CHANGE: %@", path);
 	// Need to find the corresponding node...and call [node reloadPath], then [self reloadPathNode:node]
-	PathNode *node = [self nodeForPath:path];
-	DLog(@"NODE IS: %@", node);
-	[node updatePath];
-	[self reloadPathNode:node];
+	PathNode *node;
+	do {
+		node = [self nodeForPath:path];
+		path = [path stringByDeletingLastPathComponent];
+		if(!path || [path length] < 2) return;
+	} while(!node);
+
+	if(flags & kFSEventStreamEventFlagItemRemoved) {
+		DLog(@"Removing node: %@", node);
+		PathNode *parentNode = [self nodeForPath:path];
+		[parentNode updatePath];
+		[self reloadPathNode:parentNode];
+	} else {
+		DLog(@"NODE IS: %@", node);
+		[node updatePath];
+		[self reloadPathNode:node];
+	}
 }
 
 - (NSInteger)outlineView:(NSOutlineView *)outlineView numberOfChildrenOfItem:(id)item {

FileTree/PathNode.h

@@ -16,9 +16,13 @@
 	NSURL *url;
 	NSString *display; // The pretty path to display.
 
+	NSString *lastPathComponent;
+
 	NSImage *icon;
 
 	NSArray *subpaths;
+
+	NSMutableDictionary *subpathsLookup;
 }
 
 - (id)initWithDataSource:(FileTreeDataSource *)ds url:(NSURL *)u;
@@ -34,6 +38,12 @@
 - (NSString *)display;
 - (void)setDisplay:(NSString *)s;
 
+- (NSString *)lastPathComponent;
+- (void)setLastPathComponent:(NSString *)s;
+
+- (NSDictionary *)subpathsLookup;
+- (void)setSubpathsLookup:(NSMutableDictionary *)d;
+
 - (NSImage *)icon;
 
 - (BOOL)isLeaf;

FileTree/PathNode.m

@@ -60,6 +60,8 @@ NSURL *resolveAliases(NSURL *url) {
 
 	display = [[NSFileManager defaultManager] displayNameAtPath:[u path]];
 
+	lastPathComponent = [[u path] lastPathComponent];
+
 	icon = [[NSWorkspace sharedWorkspace] iconForFile:[url path]];
 
 	[icon setSize:NSMakeSize(16.0, 16.0)];
@@ -134,6 +136,19 @@ NSURL *resolveAliases(NSURL *url) {
 
 - (void)setSubpaths:(NSArray *)s {
 	subpaths = s;
+
+	subpathsLookup = [[NSMutableDictionary alloc] init];
+	for(PathNode *node in s) {
+		[subpathsLookup setObject:node forKey:node.lastPathComponent];
+	}
+}
+
+- (NSDictionary *)subpathsLookup {
+	return subpathsLookup;
+}
+
+- (void)setSubpathsLookup:(NSMutableDictionary *)d {
+	subpathsLookup = d;
 }
 
 - (BOOL)isLeaf {
@@ -152,4 +167,12 @@ NSURL *resolveAliases(NSURL *url) {
 	return icon;
 }
 
+- (NSString *)lastPathComponent {
+	return lastPathComponent;
+}
+
+- (void)setLastPathComponent:(NSString *)s {
+	lastPathComponent = s;
+}
+
 @end

FileTree/PathWatcher.h

@@ -25,6 +25,6 @@
 
 @protocol PathWatcherDelegate
 
-- (void)pathDidChange:(NSString *)path;
+- (void)pathDidChange:(NSString *)path flags:(FSEventStreamEventFlags)flags;
 
 @end

FileTree/PathWatcher.m

@@ -22,7 +22,7 @@ const FSEventStreamEventId eventIds[]) {
 	printf("Callback called\n");
 	for(i = 0; i < numEvents; i++) {
 		NSString *pathString = [[NSString alloc] initWithUTF8String:paths[i]];
-		[[pathWatcher delegate] pathDidChange:pathString];
+		[[pathWatcher delegate] pathDidChange:pathString flags:eventFlags[i]];
 	}
 }
 
@@ -62,7 +62,7 @@ const FSEventStreamEventId eventIds[]) {
 	                             (__bridge CFArrayRef)pathsToWatch,
 	                             kFSEventStreamEventIdSinceNow, // Or a previous event ID
 	                             1.0, // latency in seconds
-	                             kFSEventStreamCreateFlagNone // Watch this and all its subdirectories
+	                             kFSEventStreamCreateFlagFileEvents // Watch this and all its subdirectories
 	);
 
 	FSEventStreamScheduleWithRunLoop(stream, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);

FileTree/SmartFolderNode.m

@@ -41,6 +41,11 @@
 
 - (void)setSubpaths:(id)s {
 	subpaths = s;
+
+	subpathsLookup = [[NSMutableDictionary alloc] init];
+	for(PathNode *node in s) {
+		[subpathsLookup setObject:node forKey:node.lastPathComponent];
+	}
 }
 
 - (unsigned int)countOfSubpaths {