Add support for watch options and windows recursive watch

Author: garyjN7

README.md

@@ -20,19 +20,25 @@ npm install pathwatcher
 PathWatcher = require 'pathwatcher'
 ```
 
-### PathWatcher.watch(filename, [listener])
+### PathWatcher.watch(filename, [options], [listener])
 
 Watch for changes on `filename`, where `filename` is either a file or a
 directory. The returned object is a `PathWatcher`.
 
+The options argument is a javascript object:
+`{ recursive: true }` will allow pathWatcher to watch a Windows directory
+recursively for any changes to files or directories under it.  This option has
+no effect on non-Windows operating systems.
+
 The listener callback gets two arguments `(event, path)`. `event` can be `rename`,
 `delete` or `change`, and `path` is the path of the file which triggered the
 event.
 
 For directories, the `change` event is emitted when a file or directory under
-the watched directory got created or deleted. And the `PathWatcher.watch` is
-not recursive, so changes of subdirectories under the watched directory would
-not be detected.
+the watched directory got created or deleted. And if the `PathWatcher.watch` is
+not recursive i.e. non-Windows operating systems or if the option has not
+been enabled on Windows, changes of subdirectories under the watched directory
+would not be detected.
 
 ### PathWatcher.close()
 

spec/pathwatcher-spec.coffee

@@ -7,6 +7,7 @@ temp.track()
 
 describe 'PathWatcher', ->
   tempDir = temp.mkdirSync('node-pathwatcher-directory')
+  baseDir = path.dirname(tempDir)
   tempFile = path.join(tempDir, 'file')
 
   beforeEach ->
@@ -165,3 +166,55 @@ describe 'PathWatcher', ->
       fs.unlinkSync(nested3)
       fs.rmdirSync(nested2)
       fs.rmdirSync(nested1)
+
+  describe 'when a file is added under a recursively watched directory #win32', ->
+    it 'fires the callback with the event type and file path', ->
+      eventType = null
+      eventPath = null
+      newFile = path.join(tempDir, 'newfile')
+
+      watcher = pathWatcher.watch baseDir,  { recursive: true }, (type, path) ->
+        eventType = type
+        eventPath = path
+
+      fs.writeFileSync(newFile, 'added')
+
+      waitsFor -> eventType?
+      runs ->
+        expect(eventType).toBe 'change'
+        expect(eventPath).toBe newFile
+
+  describe 'when a file is renamed under a recursively watched directory #win32', ->
+    it 'fires the callback with the event type and file path', ->
+      eventType = null
+      eventPath = null
+      newFile = path.join(tempDir, 'newfile')
+      renamedFile = path.join(tempDir, 'renamedfile')
+
+      watcher = pathWatcher.watch baseDir,  { recursive: true }, (type, path) ->
+        eventType = type
+        eventPath = path
+
+      fs.renameSync(newFile, renamedFile)
+
+      waitsFor -> eventType?
+      runs ->
+        expect(eventType).toBe 'change'
+        expect(eventPath).toBe renamedFile
+
+  describe 'when a file is removed under a recursively watched directory #win32', ->
+    it 'fires the callback with the event type and file path', ->
+      eventType = null
+      eventPath = null
+      renamedFile = path.join(tempDir, 'renamedfile')
+
+      watcher = pathWatcher.watch baseDir,  { recursive: true }, (type, path) ->
+        eventType = type
+        eventPath = path
+
+      fs.unlinkSync(renamedFile)
+
+      waitsFor -> eventType?
+      runs ->
+        expect(eventType).toBe 'change'
+        expect(eventPath).toBe renamedFile

src/common.cc

@@ -122,7 +122,11 @@ NAN_METHOD(Watch) {
     return Nan::ThrowTypeError("String required");
 
   Handle<String> path = info[0]->ToString();
-  WatcherHandle handle = PlatformWatch(*String::Utf8Value(path));
+  unsigned int flags = 0;
+
+  if (info[1]->IsTrue())
+    flags |= FLAG_RECURSIVE;
+  WatcherHandle handle = PlatformWatch(*String::Utf8Value(path), flags);
   if (!PlatformIsHandleValid(handle)) {
     int error_number = PlatformInvalidHandleToErrorNumber(handle);
     v8::Local<v8::Value> err =

src/common.h

@@ -24,7 +24,7 @@ typedef int32_t WatcherHandle;
 
 void PlatformInit();
 void PlatformThread();
-WatcherHandle PlatformWatch(const char* path);
+WatcherHandle PlatformWatch(const char* path, unsigned int flags_uint);
 void PlatformUnwatch(WatcherHandle handle);
 bool PlatformIsHandleValid(WatcherHandle handle);
 int PlatformInvalidHandleToErrorNumber(WatcherHandle handle);
@@ -40,6 +40,10 @@ enum EVENT_TYPE {
   EVENT_CHILD_CREATE,
 };
 
+enum WATCH_FLAGS {
+  FLAG_RECURSIVE = 1
+};
+
 void WaitForMainThread();
 void WakeupNewThread();
 void PostEventAndWait(EVENT_TYPE type,

src/directory.coffee

@@ -307,10 +307,11 @@ class Directory
   ###
 
   subscribeToNativeChangeEvents: ->
-    @watchSubscription ?= PathWatcher.watch @path, (eventType) =>
-      if eventType is 'change'
-        @emit 'contents-changed' if Grim.includeDeprecatedAPIs
-        @emitter.emit 'did-change'
+    if not PathWatcher.isWatchedByParent @path
+      @watchSubscription ?= PathWatcher.watch @path, (eventType) =>
+        if eventType is 'change'
+          @emit 'contents-changed' if Grim.includeDeprecatedAPIs
+          @emitter.emit 'did-change'
 
   unsubscribeFromNativeChangeEvents: ->
     if @watchSubscription?

src/file.coffee

@@ -471,8 +471,9 @@ class File
         @emitter.emit 'did-delete'
 
   subscribeToNativeChangeEvents: ->
-    @watchSubscription ?= PathWatcher.watch @path, (args...) =>
-      @handleNativeChangeEvent(args...)
+    if not PathWatcher.isWatchedByParent @path
+      @watchSubscription ?= PathWatcher.watch @path, (args...) =>
+        @handleNativeChangeEvent(args...)
 
   unsubscribeFromNativeChangeEvents: ->
     if @watchSubscription?

src/main.coffee

@@ -10,7 +10,7 @@ binding.setCallback (event, handle, filePath, oldFilePath) ->
   handleWatchers.get(handle).onEvent(event, filePath, oldFilePath) if handleWatchers.has(handle)
 
 class HandleWatcher extends EventEmitter
-  constructor: (@path) ->
+  constructor: (@path, @options) ->
     @setMaxListeners(Infinity)
     @start()
 
@@ -46,7 +46,7 @@ class HandleWatcher extends EventEmitter
         @emit('change', event, filePath, oldFilePath)
 
   start: ->
-    @handle = binding.watch(@path)
+    @handle = binding.watch(@path, @options.recursive)
     if handleWatchers.has(@handle)
       troubleWatcher = handleWatchers.get(@handle)
       troubleWatcher.close()
@@ -66,21 +66,25 @@ class PathWatcher extends EventEmitter
   path: null
   handleWatcher: null
 
-  constructor: (filePath, callback) ->
+  constructor: (filePath, options, callback) ->
     @path = filePath
+    @isRecursive = false
 
     # On Windows watching a file is emulated by watching its parent folder.
     if process.platform is 'win32'
       stats = fs.statSync(filePath)
       @isWatchingParent = not stats.isDirectory()
+      @isRecursive = not @isWatchingParent and options.recursive or false
+    else
+      options.recursive = false
 
     filePath = path.dirname(filePath) if @isWatchingParent
     for watcher in handleWatchers.values()
       if watcher.path is filePath
         @handleWatcher = watcher
         break
 
-    @handleWatcher ?= new HandleWatcher(filePath)
+    @handleWatcher ?= new HandleWatcher(filePath, options)
 
     @onChange = (event, newFilePath, oldFilePath) =>
       switch event
@@ -91,27 +95,38 @@ class PathWatcher extends EventEmitter
         when 'child-rename'
           if @isWatchingParent
             @onChange('rename', newFilePath) if @path is oldFilePath
+          else if @isRecursive
+            @onChange('change', newFilePath)
           else
             @onChange('change', '')
         when 'child-delete'
           if @isWatchingParent
             @onChange('delete', null) if @path is newFilePath
+          else if @isRecursive
+            @onChange('change', newFilePath)
           else
             @onChange('change', '')
         when 'child-change'
           @onChange('change', '') if @isWatchingParent and @path is newFilePath
         when 'child-create'
-          @onChange('change', '') unless @isWatchingParent
+          if @isRecursive
+            @onChange('change', newFilePath)
+          else
+            @onChange('change', '') unless @isWatchingParent
 
     @handleWatcher.on('change', @onChange)
 
   close: ->
     @handleWatcher.removeListener('change', @onChange)
     @handleWatcher.closeIfNoListener()
 
-exports.watch = (path, callback) ->
+exports.watch = (path, options, callback) ->
   path = require('path').resolve(path)
-  new PathWatcher(path, callback)
+  options = options or {}
+  if (typeof options is 'function')
+    callback = options
+    options = {}
+  new PathWatcher(path, options, callback)
 
 exports.closeAllWatchers = ->
   watcher.close() for watcher in handleWatchers.values()
@@ -122,5 +137,12 @@ exports.getWatchedPaths = ->
   paths.push(watcher.path) for watcher in handleWatchers.values()
   paths
 
+exports.isWatchedByParent = (path) ->
+  for watcher in handleWatchers.values()
+    watcherPath = watcher.path
+    if path.startsWith(watcherPath) and watcherPath.options.recursive
+      return true
+  false
+
 exports.File = require './file'
 exports.Directory = require './directory'

src/pathwatcher_linux.cc

@@ -62,7 +62,7 @@ void PlatformThread() {
   }
 }
 
-WatcherHandle PlatformWatch(const char* path) {
+WatcherHandle PlatformWatch(const char* path, unsigned int flags_uint) {
   if (g_inotify == -1) {
     return -g_init_errno;
   }

src/pathwatcher_unix.cc

@@ -72,7 +72,7 @@ void PlatformThread() {
   }
 }
 
-WatcherHandle PlatformWatch(const char* path) {
+WatcherHandle PlatformWatch(const char* path, unsigned int flags_uint) {
   if (g_kqueue == -1) {
     return -g_init_errno;
   }

src/pathwatcher_win.cc

@@ -29,10 +29,11 @@ struct ScopedLocker {
 };
 
 struct HandleWrapper {
-  HandleWrapper(WatcherHandle handle, const char* path_str)
+  HandleWrapper(WatcherHandle handle, const char* path_str, unsigned int flags_uint)
       : dir_handle(handle),
         path(strlen(path_str)),
-        canceled(false) {
+        canceled(false),
+        flags(flags_uint) {
     memset(&overlapped, 0, sizeof(overlapped));
     overlapped.hEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
     g_events.push_back(overlapped.hEvent);
@@ -61,6 +62,7 @@ struct HandleWrapper {
   WatcherHandle dir_handle;
   std::vector<char> path;
   bool canceled;
+  unsigned int flags;
   OVERLAPPED overlapped;
   char buffer[kDirectoryWatcherBufferSize];
 
@@ -82,7 +84,7 @@ static bool QueueReaddirchanges(HandleWrapper* handle) {
   return ReadDirectoryChangesW(handle->dir_handle,
                                handle->buffer,
                                kDirectoryWatcherBufferSize,
-                               FALSE,
+                               (handle->flags & FLAG_RECURSIVE) ? TRUE : FALSE,
                                FILE_NOTIFY_CHANGE_FILE_NAME      |
                                  FILE_NOTIFY_CHANGE_DIR_NAME     |
                                  FILE_NOTIFY_CHANGE_ATTRIBUTES   |
@@ -246,7 +248,7 @@ void PlatformThread() {
   }
 }
 
-WatcherHandle PlatformWatch(const char* path) {
+WatcherHandle PlatformWatch(const char* path, unsigned int flags_uint) {
   wchar_t wpath[MAX_PATH] = { 0 };
   MultiByteToWideChar(CP_UTF8, 0, path, -1, wpath, MAX_PATH);
 
@@ -272,7 +274,7 @@ WatcherHandle PlatformWatch(const char* path) {
   std::unique_ptr<HandleWrapper> handle;
   {
     ScopedLocker locker(g_handle_wrap_map_mutex);
-    handle.reset(new HandleWrapper(dir_handle, path));
+    handle.reset(new HandleWrapper(dir_handle, path, flags_uint));
   }
 
   if (!QueueReaddirchanges(handle.get())) {