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FileWatcherExample/Classes/FileWatcher.h

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+//
+//  FileWatcher.h
+//  GitSync
+//
+//  Abstract: FileWatcher watches for changes on a set of files and calls fileDidChangeAtPath.
+//
+//  Created by Peter Sugihara on 1/4/11.
+//  Copyright 2011 Peter Sugihara. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+@protocol FileWatcherDelegate;
+@interface FileWatcher : NSObject <NSCoding> {
+@private
+    NSMutableDictionary *fileModificationDates; // Keys are bookmarks being watched.
+    id <FileWatcherDelegate> delegate;
+    NSRunLoop *runLoop;
+    NSFileManager *fm;
+}
+
+- (void)watchFileAtURL:(NSURL *)path; 
+- (void)stopWatchingFileAtURL:(NSURL *)path;
+
+@property (nonatomic, assign) id <FileWatcherDelegate> delegate;
+@property (nonatomic, retain) NSMutableDictionary *fileModificationDates;
+
+@end
+
+
+@protocol FileWatcherDelegate <NSObject>
+- (void)fileDidChangeAtURL:(NSURL *)notification;
+@end

FileWatcherExample/Classes/FileWatcher.m

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+//
+//  FileWatcher.m
+//  GitSync
+//
+//  Created by Peter Sugihara on 1/4/11.
+//  Copyright 2011 Peter Sugihara. All rights reserved.
+//
+
+#import "FileWatcher.h"
+
+@interface FileWatcher()
+- (void)startWatching;
+- (void)checkForUpdates;
+- (NSDate *)modificationDateForURL:(NSURL *)url;
+- (NSURL *)urlFromBookmark:(NSData *)bookmark;
+- (NSData *)bookmarkFromURL:(NSURL *)url;
+
+@end
+
+
+@implementation FileWatcher
+@synthesize delegate;
+@synthesize fileModificationDates;
+
+- (id)init {
+    if ((self = [super init])) {
+        fm = [[NSFileManager alloc] init];
+        fileModificationDates = [[NSMutableDictionary alloc] init];
+        [self startWatching];
+    }
+
+    return self;
+}
+
+- (void)watchFileAtURL:(NSURL *)url {
+    NSData *bookmark = [self bookmarkFromURL:url];
+    NSDate *modDate = [self modificationDateForURL:url];
+
+    [fileModificationDates setObject:modDate forKey:bookmark];
+}
+
+- (void)stopWatchingFileAtURL:(NSURL *)url {
+    for (NSURL *watchedURL in [fileModificationDates allKeys]) {
+        if ([watchedURL isEqual:url])
+            [fileModificationDates removeObjectForKey:url];
+    }
+}
+
+- (NSDate *)modificationDateForURL:(NSURL *)URL {
+    NSDictionary *fileAttributes = [fm attributesOfItemAtPath:[URL path] error:NULL];
+    NSDate *modDate = [fileAttributes fileModificationDate];
+    return modDate;
+}
+
+- (void)startWatching {
+    int latency = 3;
+	NSTimer *timer = [NSTimer timerWithTimeInterval:latency
+                                             target:self 
+                                           selector:@selector(checkForUpdates) 
+                                           userInfo:nil 
+                                            repeats:YES];
+	runLoop = [NSRunLoop currentRunLoop];
+	[runLoop addTimer:timer forMode:NSDefaultRunLoopMode];
+}
+
+- (void)checkForUpdates {
+    for (NSData *bookmark in [fileModificationDates allKeys]) {
+        NSURL *watchedURL = [self urlFromBookmark:bookmark];
+        NSDate *modDate = [self modificationDateForURL:watchedURL];
+        // Fires YES the first time it's called after the program turns on.
+        // Not sure why, don't really care right now. [Sorry !];
+        if ([modDate compare:[fileModificationDates objectForKey:bookmark
+                              ]] == NSOrderedDescending) {
+            [fileModificationDates setObject:modDate forKey:bookmark]; // update modDate
+            [delegate fileDidChangeAtURL:watchedURL]; // callback
+        }
+    }
+}
+
+- (NSData *)bookmarkFromURL:(NSURL *)url {
+    NSData *bookmark = [url bookmarkDataWithOptions:NSURLBookmarkCreationMinimalBookmark
+                     includingResourceValuesForKeys:NULL
+                                      relativeToURL:NULL
+                                              error:NULL];
+    return bookmark;
+}
+
+- (NSURL *)urlFromBookmark:(NSData *)bookmark {
+    NSURL *url = [NSURL URLByResolvingBookmarkData:bookmark
+                                           options:NSURLBookmarkResolutionWithoutUI
+                                     relativeToURL:NULL
+                               bookmarkDataIsStale:NO
+                                             error:NULL];
+    return url;
+}
+
+- (void)dealloc {
+    // Clean-up code here.
+    [super dealloc];
+}
+
+#pragma mark -
+#pragma mark NSCoding
+
+- (id)initWithCoder:(NSCoder *)decoder {
+    if ((self = [self init])) {
+        NSDictionary *decoded = [decoder decodeObjectForKey:@"fileModificationDates"];
+        [fileModificationDates setDictionary:decoded];
+    }
+
+    return self;
+}
+
+- (void)encodeWithCoder:(NSCoder *)encoder {
+    [encoder encodeObject:fileModificationDates forKey:@"fileModificationDates"];
+}
+
+@end

FileWatcherExample/Classes/FileWatcherExampleAppDelegate.h

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+//
+//  FileWatcherExampleAppDelegate.h
+//  FileWatcherExample
+//
+//  Created by Peter Sugihara on 2/8/11.
+//  Copyright 2011 Bard College. All rights reserved.
+//
+
+#import <Cocoa/Cocoa.h>
+#import "FileWatcher.h"
+
+@interface FileWatcherExampleAppDelegate : NSObject <NSApplicationDelegate, FileWatcherDelegate> {
+    FileWatcher *watcher;
+}
+
+- (void)fileDidChangeAtURL:(NSURL *)url;
+- (void)watchFileAtURL:(NSURL *)url;
+- (void)stopWatchingFileAtURL:(NSURL *)url;
+
+@end

FileWatcherExample/Classes/FileWatcherExampleAppDelegate.m

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+//
+//  FileWatcherExampleAppDelegate.m
+//  FileWatcherExample
+//
+//  Created by Peter Sugihara on 2/8/11.
+//  Copyright 2011 Bard College. All rights reserved.
+//
+
+#import "FileWatcherExampleAppDelegate.h"
+
+@implementation FileWatcherExampleAppDelegate
+
+- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
+	watcher = [[FileWatcher alloc] init];
+    watcher.delegate = self;
+
+    // A test watch:
+    // [self watchFileAtURL:[NSURL URLWithString:@"path/to/file"]];
+}
+
+- (void)fileDidChangeAtURL:(NSURL *)url {
+    NSLog(@"i saw that, %@!", url);
+}
+
+- (void)watchFileAtURL:(NSURL *)url {
+    [watcher watchFileAtURL:url];
+}
+
+- (void)stopWatchingFileAtURL:(NSURL *)url {
+    [watcher stopWatchingFileAtURL:url];
+}
+
+
+@end

FileWatcherExample/FileWatcherExample-Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+
+    <key>CFBundleIdentifier</key>
+    <string>edu.pys.${PRODUCT_NAME:rfc1034identifier}</string>
+    <key>CFBundleDevelopmentRegion</key>
+    <string>en</string>
+    <key>CFBundleExecutable</key>
+    <string>${EXECUTABLE_NAME}</string>
+    <key>CFBundleIconFile</key>
+    <string></string>
+    <key>CFBundleInfoDictionaryVersion</key>
+    <string>6.0</string>
+    <key>CFBundleName</key>
+    <string>${PRODUCT_NAME}</string>
+    <key>CFBundlePackageType</key>
+    <string>APPL</string>
+    <key>CFBundleSignature</key>
+    <string>????</string>
+    <key>CFBundleShortVersionString</key>
+    <string>1.0</string>
+    <key>LSMinimumSystemVersion</key>
+    <string>${MACOSX_DEPLOYMENT_TARGET}</string>
+    <key>CFBundleVersion</key>
+    <string>1</string>
+    <key>NSMainNibFile</key>
+    <string>MainMenu</string>
+    <key>NSPrincipalClass</key>
+    <string>NSApplication</string>
+</dict>
+</plist>
+

FileWatcherExample/FileWatcherExample-Prefix.pch

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+//
+// Prefix header for all source files of the 'FileWatcherExample' target in the 'FileWatcherExample' project
+//
+
+#ifdef __OBJC__
+    #import <Cocoa/Cocoa.h>
+#endif

FileWatcherExample/FileWatcherExample-main.m

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+//
+//  FileWatcherExample-main.m
+//  FileWatcherExample
+//
+//  Created by Peter Sugihara on 2/8/11.
+//  Copyright 2011 Bard College. All rights reserved.
+//
+
+#import <Cocoa/Cocoa.h>
+
+int main(int argc, char *argv[]) {
+    return NSApplicationMain(argc,  (const char **) argv);
+}