From 16370ea1a1c9fcdc81e80e1459d06a26116857fc Mon Sep 17 00:00:00 2001
From: johnste <john@johnste.se>
Date: Tue, 7 Jul 2015 23:42:11 +0200
Subject: [PATCH] Add path watcher and set it up to watch the config file

---
 Finicky/Finicky.xcodeproj/project.pbxproj |  4 ++
 Finicky/Finicky/FNConfigLoader.swift      | 12 +++++
 Finicky/Finicky/FNPathWatcher.swift       | 59 +++++++++++++++++++++++
 3 files changed, 75 insertions(+)
 create mode 100644 Finicky/Finicky/FNPathWatcher.swift

diff --git a/Finicky/Finicky.xcodeproj/project.pbxproj b/Finicky/Finicky.xcodeproj/project.pbxproj
index cb9b64c..5a1084d 100644
--- a/Finicky/Finicky.xcodeproj/project.pbxproj
+++ b/Finicky/Finicky.xcodeproj/project.pbxproj
@@ -19,6 +19,7 @@
 		548F11CE1B2A43F700FDDC3C /* FNAPI.swift in Sources */ = {isa = PBXBuildFile; fileRef = 548F11CD1B2A43F700FDDC3C /* FNAPI.swift */; };
 		54B0E7031B4678CE003F8AEE /* FNShortUrlResolver.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54B0E7021B4678CE003F8AEE /* FNShortUrlResolver.swift */; };
 		54E33FD71B24E27000998E13 /* FNConfigLoader.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54E33FD61B24E27000998E13 /* FNConfigLoader.swift */; };
+		54F2EEE41B4C68E300638DAE /* FNPathWatcher.swift in Sources */ = {isa = PBXBuildFile; fileRef = 54F2EEE31B4C68E300638DAE /* FNPathWatcher.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -48,6 +49,7 @@
 		548F11CD1B2A43F700FDDC3C /* FNAPI.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = FNAPI.swift; sourceTree = "<group>"; };
 		54B0E7021B4678CE003F8AEE /* FNShortUrlResolver.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = FNShortUrlResolver.swift; sourceTree = "<group>"; };
 		54E33FD61B24E27000998E13 /* FNConfigLoader.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = FNConfigLoader.swift; sourceTree = "<group>"; };
+		54F2EEE31B4C68E300638DAE /* FNPathWatcher.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = FNPathWatcher.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -102,6 +104,7 @@
 				54E33FD61B24E27000998E13 /* FNConfigLoader.swift */,
 				548F11CD1B2A43F700FDDC3C /* FNAPI.swift */,
 				54B0E7021B4678CE003F8AEE /* FNShortUrlResolver.swift */,
+				54F2EEE31B4C68E300638DAE /* FNPathWatcher.swift */,
 			);
 			path = Finicky;
 			sourceTree = "<group>";
@@ -244,6 +247,7 @@
 			files = (
 				54E33FD71B24E27000998E13 /* FNConfigLoader.swift in Sources */,
 				54899CD61B20D5BC00647101 /* AppDelegate.swift in Sources */,
+				54F2EEE41B4C68E300638DAE /* FNPathWatcher.swift in Sources */,
 				54B0E7031B4678CE003F8AEE /* FNShortUrlResolver.swift in Sources */,
 				548F11CE1B2A43F700FDDC3C /* FNAPI.swift in Sources */,
 			);
diff --git a/Finicky/Finicky/FNConfigLoader.swift b/Finicky/Finicky/FNConfigLoader.swift
index b86fa3e..cd7572f 100644
--- a/Finicky/Finicky/FNConfigLoader.swift
+++ b/Finicky/Finicky/FNConfigLoader.swift
@@ -14,6 +14,8 @@ var FNConfigPath: String = "~/.finicky.js"
 class FNConfigLoader {
     
     var configPaths: NSMutableSet;
+    var configWatcher: FNPathWatcher?;
+    var monitor : FNPathWatcher!;
     
     init() {
         self.configPaths = NSMutableSet()
@@ -25,6 +27,15 @@ class FNConfigLoader {
         configPaths.addObject(FNConfigPath)
     }
     
+    func setupConfigWatcher() {
+
+        let url = NSURL(fileURLWithPath: FNConfigPath.stringByExpandingTildeInPath)!
+        monitor = FNPathWatcher(url: url, handler: {
+            self.reload()
+        })
+        monitor.start()
+    }
+    
     func reload() {
         self.resetConfigPaths()
         var error:NSError?
@@ -49,6 +60,7 @@ class FNConfigLoader {
     
         self.setupAPI(ctx)
         ctx.evaluateScript(config!)
+        setupConfigWatcher()
     }
     
     func setupAPI(ctx: JSContext) {
diff --git a/Finicky/Finicky/FNPathWatcher.swift b/Finicky/Finicky/FNPathWatcher.swift
new file mode 100644
index 0000000..fc99407
--- /dev/null
+++ b/Finicky/Finicky/FNPathWatcher.swift
@@ -0,0 +1,59 @@
+//
+//  FNPathWatcher.swift
+//  Finicky
+//
+//  Created by John Sterling on 07/07/15.
+//  Copyright (c) 2015 John sterling. All rights reserved.
+//
+
+import Foundation
+
+public class FNPathWatcher {
+    
+    enum State {
+        case On, Off
+    }
+    
+    private let source: dispatch_source_t
+    private let descriptor: CInt
+    private var state: State = .Off
+    
+    /// Creates a folder monitor object with monitoring enabled.
+    public init(url: NSURL, handler: ()->Void) {
+        
+        state = .Off
+        descriptor = open(url.fileSystemRepresentation, O_EVTONLY)
+        let queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
+        source = dispatch_source_create(
+            DISPATCH_SOURCE_TYPE_VNODE,
+            UInt(descriptor),
+            DISPATCH_VNODE_DELETE | DISPATCH_VNODE_WRITE | DISPATCH_VNODE_EXTEND | DISPATCH_VNODE_ATTRIB | DISPATCH_VNODE_LINK | DISPATCH_VNODE_RENAME | DISPATCH_VNODE_REVOKE,
+            queue
+        )
+
+        dispatch_source_set_event_handler(source, handler)
+        //dispatch_source_set_cancel_handler({})
+        start()
+    }
+    
+    /// Starts sending notifications if currently stopped
+    public func start() {
+        if state == .Off {
+            state = .On
+            dispatch_resume(source)
+        }
+    }
+    
+    /// Stops sending notifications if currently enabled
+    public func stop() {
+        if state == .On {
+            state = .Off
+            dispatch_suspend(source)
+        }
+    }
+    
+    deinit {
+        close(descriptor)
+        dispatch_source_cancel(source)
+    }
+}
\ No newline at end of file