var EventEmitter = require('../lib/eventemitter.js'); var Path = require('./path.js'); var Intercom = require('../lib/intercom.js'); /** * FSWatcher based on node.js' FSWatcher * see https://github.com/joyent/node/blob/master/lib/fs.js */ function FSWatcher() { EventEmitter.call(this); var self = this; var recursive = false; var recursivePathPrefix; var filename; function onchange(path) { // Watch for exact filename, or parent path when recursive is true. if(filename === path || (recursive && path.indexOf(recursivePathPrefix) === 0)) { self.trigger('change', 'change', path); } } // We support, but ignore the second arg, which node.js uses. self.start = function(filename_, persistent_, recursive_) { // Bail if we've already started (and therefore have a filename); if(filename) { return; } if(Path.isNull(filename_)) { throw new Error('Path must be a string without null bytes.'); } // TODO: get realpath for symlinks on filename... // Filer's Path.normalize strips trailing slashes, which we use here. // See https://github.com/js-platform/filer/issues/105 filename = Path.normalize(filename_); // Whether to watch beneath this path or not recursive = recursive_ === true; // If recursive, construct a path prefix portion for comparisons later // (i.e., '/path' becomes '/path/' so we can search within a filename for the // prefix). We also take care to allow for '/' on its own. if(recursive) { recursivePathPrefix = filename === '/' ? '/' : filename + '/'; } var intercom = Intercom.getInstance(); intercom.on('change', onchange); }; self.close = function() { var intercom = Intercom.getInstance(); intercom.off('change', onchange); self.removeAllListeners('change'); }; } FSWatcher.prototype = new EventEmitter(); FSWatcher.prototype.constructor = FSWatcher; module.exports = FSWatcher;