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sysPath.dirname(path) : path; var watchContainer; var parentPath = sysPath.dirname(watchPath); // If we've accumulated a substantial number of paths that // could have been consolidated by watching one directory // above the current one, create a watcher on the parent // path instead, so that we do consolidate going forward. if (couldConsolidate(parentPath)) { watchPath = parentPath; } var resolvedPath = sysPath.resolve(path); var hasSymlink = resolvedPath !== realPath; function filteredListener(fullPath, flags, info) { if (hasSymlink) fullPath = fullPath.replace(realPath, resolvedPath); if ( fullPath === resolvedPath || !fullPath.indexOf(resolvedPath + sysPath.sep) ) listener(fullPath, flags, info); } // check if there is already a watcher on a parent path // modifies `watchPath` to the parent path when it finds a match function watchedParent() { return Object.keys(FSEventsWatchers).some(function(watchedPath) { // condition is met when indexOf returns 0 if (!realPath.indexOf(sysPath.resolve(watchedPath) + sysPath.sep)) { watchPath = watchedPath; return true; } }); } if (watchPath in FSEventsWatchers || watchedParent()) { watchContainer = FSEventsWatchers[watchPath]; watchContainer.listeners.push(filteredListener); } else { watchContainer = FSEventsWatchers[watchPath] = { listeners: [filteredListener], rawEmitters: [rawEmitter], watcher: createFSEventsInstance(watchPath, function(fullPath, flags) { var info = fsevents.getInfo(fullPath, flags); watchContainer.listeners.forEach(function(listener) { listener(fullPath, flags, info); }); watchContainer.rawEmitters.forEach(function(emitter) { emitter(info.event, fullPath, info); }); }) }; } var listenerIndex = watchContainer.listeners.length - 1; // removes this instance's listeners and closes the underlying fsevents // instance if there are no more listeners left return function close() { delete watchContainer.listeners[listenerIndex]; delete watchContainer.rawEmitters[listenerIndex]; if (!Object.keys(watchContainer.listeners).length) { watchContainer.watcher.stop(); delete FSEventsWatchers[watchPath]; } }; } // Decide whether or not we should start a new higher-level // parent watcher function couldConsolidate(path) { var keys = Object.keys(FSEventsWatchers); var count = 0; for (var i = 0, len = keys.length; i < len; ++i) { var watchPath = keys[i]; if (watchPath.indexOf(path) === 0) { count++; if (count >= consolidateThreshhold) { return true; } } } return false; } function isConstructor(obj) { return obj.prototype !== undefined && obj.prototype.constructor !== undefined; } // returns boolean indicating whether fsevents can be used function canUse() { return fsevents && Object.keys(FSEventsWatchers).length < 128 && isConstructor(fsevents); } // determines subdirectory traversal levels from root to path function depth(path, root) { var i = 0; while (!path.indexOf(root) && (path = sysPath.dirname(path)) !== root) i++; return i; } // fake constructor for attaching fsevents-specific prototype methods that // will be copied to FSWatcher's prototype function FsEventsHandler() {} // Private method: Handle symlinks encountered during directory scan // * watchPath - string, file/dir path to be watched with fsevents // * realPath - string, real path (in case of symlinks) // * transform - function, path transformer // * globFilter - function, path filter in case a glob pattern was provided // Returns close function for the watcher instance FsEventsHandler.prototype._watchWithFsEvents = function(watchPath, realPath, transform, globFilter) { if (this._isIgnored(watchPath)) return; var watchCallback = function(fullPath, flags, info) { if ( this.options.depth !== undefined && depth(fullPath, realPath) > this.options.depth ) return; var path = transform(sysPath.join( watchPath, sysPath.relative(watchPath, fullPath) )); if (globFilter && !globFilter(path)) return; // ensure directories are tracked var parent = sysPath.dirname(path); var item = sysPath.basename(path); var watchedDir = this._getWatchedDir( info.type === 'directory' ? path : parent ); var checkIgnored = function(stats) { if (this._isIgnored(path, stats)) { this._ignoredPaths[path] = true; if (stats && stats.isDirectory()) { this._ignoredPaths[path + '/**/*'] = true; } return true; } else { delete this._ignoredPaths[path]; delete this._ignoredPaths[path + '/**/*']; } }.bind(this); var handleEvent = function(event) { if (checkIgnored()) return; if (event === 'unlink') { // suppress unlink events on never before seen files if (info.type === 'directory' || watchedDir.has(item)) { this._remove(parent, item); } } else { if (event === 'add') { // track new directories if (info.type === 'directory') this._getWatchedDir(path); if (info.type === 'symlink' && this.options.followSymlinks) { // push symlinks back to the top of the stack to get handled var curDepth = this.options.depth === undefined ? undefined : depth(fullPath, realPath) + 1; return this._addToFsEvents(path, false, true, curDepth); } else { // track new paths // (other than symlinks being followed, which will be tracked soon) this._getWatchedDir(parent).add(item); } } var eventName = info.type === 'directory' ? event + 'Dir' : event; this._emit(eventName, path); if (eventName === 'addDir') this._addToFsEvents(path, false, true); } }.bind(this); function addOrChange() { handleEvent(watchedDir.has(item) ? 'change' : 'add'); } function checkFd() { fs.open(path, 'r', function(error, fd) { if (error) { error.code !== 'EACCES' ? handleEvent('unlink') : addOrChange(); } else { fs.close(fd, function(err) { err && err.code !== 'EACCES' ? handleEvent('unlink') : addOrChange(); }); } }); } // correct for wrong events emitted var wrongEventFlags = [ 69888, 70400, 71424, 72704, 73472, 131328, 131840, 262912 ]; if (wrongEventFlags.indexOf(flags) !== -1 || info.event === 'unknown') { if (typeof this.options.ignored === 'function') { fs.stat(path, function(error, stats) { if (checkIgnored(stats)) return; stats ? addOrChange() : handleEvent('unlink'); }); } else { checkFd(); } } else { switch (info.event) { case 'created': case 'modified': return addOrChange(); case 'deleted': case 'moved': return checkFd(); } } }.bind(this); var closer = setFSEventsListener( watchPath, realPath, watchCallback, this.emit.bind(this, 'raw') ); this._emitReady(); return closer; }; // Private method: Handle symlinks encountered during directory scan // * linkPath - string, path to symlink // * fullPath - string, absolute path to the symlink // * transform - function, pre-existing path transformer // * curDepth - int, level of subdirectories traversed to where symlink is // Returns nothing FsEventsHandler.prototype._handleFsEventsSymlink = function(linkPath, fullPath, transform, curDepth) { // don't follow the same symlink more than once if (this._symlinkPaths[fullPath]) return; else this._symlinkPaths[fullPath] = true; this._readyCount++; fs.realpath(linkPath, function(error, linkTarget) { if (this._handleError(error) || this._isIgnored(linkTarget)) { return this._emitReady(); } this._readyCount++; // add the linkTarget for watching with a wrapper for transform // that causes emitted paths to incorporate the link's path this._addToFsEvents(linkTarget || linkPath, function(path) { var dotSlash = '.' + sysPath.sep; var aliasedPath = linkPath; if (linkTarget && linkTarget !== dotSlash) { aliasedPath = path.replace(linkTarget, linkPath); } else if (path !== dotSlash) { aliasedPath = sysPath.join(linkPath, path); } return transform(aliasedPath); }, false, curDepth); }.bind(this)); }; // Private method: Handle added path with fsevents // * path - string, file/directory path or glob pattern // * transform - function, converts working path to what the user expects // * forceAdd - boolean, ensure add is emitted // * priorDepth - int, level of subdirectories already traversed // Returns nothing FsEventsHandler.prototype._addToFsEvents = function(path, transform, forceAdd, priorDepth) { // applies transform if provided, otherwise returns same value var processPath = typeof transform === 'function' ? transform : function(val) { return val; }; var emitAdd = function(newPath, stats) { var pp = processPath(newPath); var isDir = stats.isDirectory(); var dirObj = this._getWatchedDir(sysPath.dirname(pp)); var base = sysPath.basename(pp); // ensure empty dirs get tracked if (isDir) this._getWatchedDir(pp); if (dirObj.has(base)) return; dirObj.add(base); if (!this.options.ignoreInitial || forceAdd === true) { this._emit(isDir ? 'addDir' : 'add', pp, stats); } }.bind(this); var wh = this._getWatchHelpers(path); // evaluate what is at the path we're being asked to watch fs[wh.statMethod](wh.watchPath, function(error, stats) { if (this._handleError(error) || this._isIgnored(wh.watchPath, stats)) { this._emitReady(); return this._emitReady(); } if (stats.isDirectory()) { // emit addDir unless this is a glob parent if (!wh.globFilter) emitAdd(processPath(path), stats); // don't recurse further if it would exceed depth setting if (priorDepth && priorDepth > this.options.depth) return; // scan the contents of the dir readdirp({ root: wh.watchPath, entryType: 'all', fileFilter: wh.filterPath, directoryFilter: wh.filterDir, lstat: true, depth: this.options.depth - (priorDepth || 0) }).on('data', function(entry) { // need to check filterPath on dirs b/c filterDir is less restrictive if (entry.stat.isDirectory() && !wh.filterPath(entry)) return; var joinedPath = sysPath.join(wh.watchPath, entry.path); var fullPath = entry.fullPath; if (wh.followSymlinks && entry.stat.isSymbolicLink()) { // preserve the current depth here since it can't be derived from // real paths past the symlink var curDepth = this.options.depth === undefined ? undefined : depth(joinedPath, sysPath.resolve(wh.watchPath)) + 1; this._handleFsEventsSymlink(joinedPath, fullPath, processPath, curDepth); } else { emitAdd(joinedPath, entry.stat); } }.bind(this)).on('error', function() { // Ignore readdirp errors }).on('end', this._emitReady); } else { emitAdd(wh.watchPath, stats); this._emitReady(); } }.bind(this)); if (this.options.persistent && forceAdd !== true) { var initWatch = function(error, realPath) { if (this.closed) return; var closer = this._watchWithFsEvents( wh.watchPath, sysPath.resolve(realPath || wh.watchPath), processPath, wh.globFilter ); if (closer) { this._closers[path] = this._closers[path] || []; this._closers[path].push(closer); } }.bind(this); if (typeof transform === 'function') { // realpath has already been resolved initWatch(); } else { fs.realpath(wh.watchPath, initWatch); } } }; module.exports = FsEventsHandler; module.exports.canUse = canUse;