Add news feed module.

modules/newsfeed/newsfeed.js

@@ -0,0 +1,150 @@
+/* global Module */
+
+/* Magic Mirror
+ * Module: NewsFeed
+ *
+ * By Michael Teeuw http://michaelteeuw.nl
+ * MIT Licensed.
+ */
+
+Module.create({
+
+	// Default module config.
+	defaults: {
+		feedUrl: 'http://www.nytimes.com/services/xml/rss/nyt/HomePage.xml',
+		showPublishDate: true,
+		reloadInterval:  10 * 60 * 1000, // every 10 minutes
+	    updateInterval: 7.5 * 1000, 
+        animationSpeed: 2.5 * 1000, 
+
+
+		proxyUrl: 'http://localhost:8080/?url=',
+		initialLoadDelay: 0, // 5 seconds delay. This delay is used to keep the OpenWeather API happy.
+		retryDelay: 2500,
+	},
+
+	// Define required scripts.
+	getScripts: function() {
+		return ['moment.js'];
+	},
+
+	// Define start sequence.
+	start: function() {
+		Log.info('Starting module: ' + this.name);
+
+		// Set locale.
+		moment.locale(config.language);
+		
+		this.newsItems = [];
+		this.loaded = false;
+		this.scheduleFetch(this.config.initialLoadDelay);
+
+		this.fetchTimer = null;
+		this.activeItem = 0;
+	},
+
+	// Override dom generator.
+	getDom: function() {
+		var wrapper = document.createElement("div");
+
+		if (this.activeItem >= this.newsItems.length) {
+			this.activeItem = 0;
+		}
+
+		if (this.newsItems.length > 0) {
+			
+			if (this.config.showPublishDate) {
+				var timestamp = document.createElement("div");
+				timestamp.className = "light small dimmed";
+				timestamp.innerHTML = this.capitalizeFirstLetter(moment(new Date(this.newsItems[this.activeItem].pubdate)).fromNow() + ':');
+				wrapper.appendChild(timestamp);
+			}
+
+			var title = document.createElement("div");
+			title.className = "bright medium light";
+			title.innerHTML = this.newsItems[this.activeItem].title;
+			wrapper.appendChild(title);
+
+		} else {
+			wrapper.innerHTML = "Loading news ...";
+			wrapper.className = "small dimmed";
+		}
+
+		return wrapper;
+	},
+
+	/* fetchNews(compliments)
+	 * Requests new data from news proxy.
+	 */
+	fetchNews: function() {
+		var url = this.config.proxyUrl + encodeURIComponent(this.config.feedUrl);
+		var self = this;	
+
+		var newsRequest = new XMLHttpRequest();
+		newsRequest.open("GET", url, true);
+		newsRequest.onreadystatechange = function() {
+		  if(this.readyState === 4) {
+			if(this.status === 200) {
+				self.newsItems = JSON.parse(this.response);
+
+				if (!self.loaded) {
+					self.scheduleUpdateInterval();
+				}
+
+				self.loaded = true;
+			} else {
+				Log.error(self.name + ": Could not load news.");
+			}
+
+			self.scheduleFetch((self.loaded) ? -1 : self.config.retryDelay);
+			
+		  }
+		};
+		newsRequest.send();
+	},
+
+	/* scheduleUpdateInterval()
+	 * Schedule visual update.
+	 */
+	scheduleUpdateInterval: function() {
+		var self = this;
+
+		self.updateDom(self.config.animationSpeed);
+
+		setInterval(function() {
+			self.activeItem++;
+			self.updateDom(self.config.animationSpeed);
+		}, this.config.updateInterval);
+	},
+
+	/* scheduleFetch()
+	 * Schedule next news fetch.
+	 *
+	 * argument delay number - Milliseconds before next update. If empty, this.config.reloadInterval is used.
+	 */
+	scheduleFetch: function(delay) {
+		var nextLoad = this.config.reloadInterval;
+		if (typeof delay !== 'undefined' && delay >= 0) {
+			nextLoad = delay;
+		} 
+
+		var self = this;
+		clearTimeout(this.fetchTimer);
+		this.fetchTimer = setTimeout(function() {
+			self.fetchNews();
+		}, nextLoad);
+	},
+
+	/* capitalizeFirstLetter(string)
+	 * Capitalizes the first character of a string.
+	 *
+	 * argument string string - Input string.
+	 *
+	 * return string - Capitalized output string.
+	 */
+	capitalizeFirstLetter: function(string) {
+	    return string.charAt(0).toUpperCase() + string.slice(1);
+	}
+});
+
+