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dist/rss-feed-emitter.js

 'use strict';
 
+// TinyEmitter is a really nice Event Emitter. We will extend
+// our main class from it.
+
 Object.defineProperty(exports, "__esModule", {
@@ -39,11 +42,48 @@ value: true
 
+// Lodash is an utility library and makes life easy to work
+// and iterate over arrays, objects and manipulate values.
+
+
+// Request is one of the most popular modules there is to
+// make http requests.
+
+
+// Feedparser is the main choice if you want to parse
+// rss feeds in XML.
+
+
+// Bluebird empowers the default Promise with new
+// and amazing methods.
+
+
+// MAIN CLASS
+// This is where we extend from TinyEmitter and absorve
+// the #emit and #on methods to emit 'new-item' events
+// when we have new feed items.
+
 var RssFeedEmitter = function (_TinyEmitter) {
   _inherits(RssFeedEmitter, _TinyEmitter);
 
+  // The constructor special method is called everytime
+  // we create a new instance of this "Class".
+
   function RssFeedEmitter() {
     _classCallCheck(this, RssFeedEmitter);
 
+    // Also, we are creating a blank array to keep all
+    // our feed objects.
+
     var _this = _possibleConstructorReturn(this, Object.getPrototypeOf(RssFeedEmitter).call(this));
 
+    // Since this is a "Class", you have to call #super method
+    // for the parent class initialize it's internals.
+
+
     _this._feedList = [];
+
+    // This module manages automatically how many feed items
+    // it will keep in memory, and basically it will have a
+    // maximum history which is how many items the feed has
+    // multiplied by this number below. So, if the feed have
+    // 10 items, we will keep 30 items max in the history.
     _this._historyLengthMultiplier = 3;
@@ -55,3 +95,16 @@
   // PUBLIC METHODS
+  // Now we are creating the public methods, these are the
+  // ones developers will use in their softwares.
+  // Remember: if you change a method signature in a way
+  // it's not backwards compatible, you created a breaking
+  // change, so design them very well.
 
+  // ADD
+  // The #add method is one of the main ones. Basically it
+  // receives one parameter with the feed options, for example:
+  // {
+  //   url: 'http://www.nintendolife.com/feeds/news',
+  //   refresh: 2000
+  // }
+
   _createClass(RssFeedEmitter, [{
@@ -61,4 +114,10 @@ key: 'add',
 
+      // We are going to use a private method to validate
+      // the feed object. If it's valid, everything is ok,
+      // otherwise it will throw an exception.
       this._validateFeedObject(userFeedConfig);
 
+      // The developer doesn't need to specify the "refresh"
+      // property, for example, so this object have the default
+      // value.
       var defaultFeedConfig = {
@@ -68,7 +127,19 @@ refresh: 60000
 
+      // With the #defaults method of Lodash, we can merge the user defined
+      // values with the default value we defined before.
       var finalFeedConfig = _.defaults(userFeedConfig, defaultFeedConfig);
 
+      // This is a cool private method which will add this new feed if
+      // it doesn't exist in our feedList or if it does exist,
+      // we will update it.
       this._addOrUpdateFeedList(finalFeedConfig);
+
+      // In the end, return the feedList to the developer.
       return this._feedList;
     }
+
+    // REMOVE
+    // This is a very simple method and its functionality is
+    // remove a feed from the feedList.
+
   }, {
@@ -78,2 +149,4 @@ key: 'remove',
 
+      // Check if the "url" parameter is a string,
+      // otherwise throw.
       if (typeof url !== 'string') {
@@ -87,2 +160,4 @@
 
+      // Try to find the feed object using the
+      // private method #_findFeed
       var feed = this._findFeed({
@@ -92,4 +167,10 @@ url: url
 
+      // And then remove the feed object from
+      // the feedList.
       return this._removeFromFeedList(feed);
     }
+
+    // LIST
+    // Just return the feedList array.
+
   }, {
@@ -101,2 +182,6 @@ key: 'list',
     }
+
+    // DESTROY
+    // Remove all feeds from feedList.
+
   }, {
@@ -106,2 +191,6 @@ key: 'destroy',
 
+      // There's a gotcha here since we are iterating over an array
+      // while removing its properties. To do this, we have to use
+      // a little trick where you iterate backwards to not scramble
+      // the index while you're removing the properties.
       for (var i = this._feedList.length - 1; i >= 0; i--) {
@@ -116,3 +205,11 @@
     // PRIVATE METHODS
+    // These methods are not suposed to be used by the developer
+    // and you can change them without worrying about compatibilities
+    // of the public methods.
 
+    // This is used by the public method #add and will receive
+    // a feed object and check if all its properties are valid.
+    // If the validation you wan't to make is more complex, I
+    // recommend you to use a validation library.
+
   }, {
@@ -146,2 +243,7 @@ key: '_validateFeedObject',
     }
+
+    // This is also used by the public method #add and will
+    // add a new feed to feedList or update it if it's
+    // already in the list.
+
   }, {
@@ -151,4 +253,7 @@ key: '_addOrUpdateFeedList',
 
+      // First, try to find the feed in the feedList.
       var feedInList = this._findFeed(feed);
 
+      // If there's a feed, remove it from the list,
+      // since we will add it later again.
       if (feedInList) {
@@ -159,4 +264,9 @@
 
+      // Now add the feed in the list.
       return this._addToFeedList(feed);
     }
+
+    // Very simple private method: given a feed object
+    // try to find it in the feedList using its "url".
+
   }, {
@@ -170,2 +280,9 @@ key: '_findFeed',
     }
+
+    // Given a feed and item, try to find
+    // it inside the feed item list. We will use
+    // this to see if there's already an item inside
+    // the feed item list. If there is, we know it's
+    // not a new item.
+
   }, {
@@ -180,2 +297,6 @@ key: '_findItem',
     }
+
+    // This is where we create the feed itself and
+    // add it to the feedList
+
   }, {
@@ -185,18 +306,25 @@ key: '_addToFeedList',
 
+      // First, we add a blank array called "items"
+      // to the feed object. This is where we will keep the
+      // items history.
       feed.items = [];
+
+      // After this, we will create a setInterval and
+      // keep a copy of its reference to be able
+      // to clean it later when we remove it.
+      // This interval will keep fetching the feed's
+      // url for new contents.
       feed.setInterval = this._createSetInterval(feed);
+
+      // In the end, we need to push this object
+      // to the feedList array.
       this._feedList.push(feed);
     }
-  }, {
-    key: '_removeFromFeedList',
-    value: function _removeFromFeedList(feed) {
 
-      if (!feed) {
+    // This method is a little bit complex
+    // but also the most important one. It is
+    // responsible to keep fetching the RSS
+    // for content and emitting events
+    // when new items are found.
 
-        return;
-      }
-
-      clearInterval(feed.setInterval);
-      _.remove(this._feedList, { url: feed.url });
-    }
   }, {
@@ -206,4 +334,24 @@ key: '_createSetInterval',
 
+      // First, lets keep the "this" reference.
       var instance = this;
 
+      // The getContent function will:
+      //
+      // 1. call the _fetchFeed to get the content
+      //    from the RSS feed.
+      //
+      // 2. Locate the feed object inside the feedList.
+      //
+      // 3. Redefine the feed history length (using
+      //    the _historyLengthMultiplier variable.
+      //
+      // 4. Sort the received items by date so we always
+      //    work with the items in ascending order
+      //
+      // 5. Given the items received from the last fetch
+      //    and the current items in the feed item list,
+      //    select only the new ones.
+      //
+      // 6. Now take the new ones, push them to the
+      //    feed item list and emit while emitting events.
       function getContent() {
@@ -213,2 +361,6 @@
 
+          // If this chain is iterating over a recently
+          // deleted feed, it will not be found in the
+          // feedList. If this happens, just ignore
+          // silently.
           if (error.type === 'feed_not_found') {
@@ -219,7 +371,14 @@
 
+          // Otherwise, emit an "error" event
           instance.emit('error', error);
         });
 
+        // 2. This happens after we got the results from
+        // the private method _fetchFeed. Basically we
+        // are going to receive a "data" object with
+        // the feed URL and the feed content.
         function findFeed(data) {
 
+          // Try to find the feed object inside this instance
+          // using the feed url from the fetch.
           var foundFeed = instance._findFeed({
@@ -229,2 +388,6 @@ url: data.feedUrl
 
+          // If nothing is found, probably we destroyed
+          // it in the middle of a fetch. Let's throw an
+          // error to get out of this Promise chain, since
+          // we can't keep going further.
           if (!foundFeed) {
@@ -238,5 +401,15 @@
 
+          // If we found the feed, everything is ok and
+          // lets add it to the "data" object.
           data.feed = foundFeed;
         }
 
+        // Since we are managing the max history length,
+        // this is a good time to get the items length
+        // from the fetched feed, multiply it by the
+        // _historyLengthMultiplier and update the
+        // feed maxHistoryLength value. This is cool
+        // because if the source feed starts to increase
+        // or decrese its items quantity, we will ajust
+        // automatically how many items we keep in memory.
         function redefineItemHistoryMaxLength(data) {
@@ -249,2 +422,4 @@
 
+        // Sort all received items since we want to
+        // emit them in ascending order.
         function sortItemsByDate(data) {
@@ -255,8 +430,16 @@
 
+        // Put all new items inside a "newItems" property
         function identifyOnlyNewItems(data) {
 
+          // We can do this using the "filter" method of the array.
+          // The logic behind this is, if you return a "false" value,
+          // that item will be skipped, but if you return a "true"
+          // value, it will be added to the final array.
           data.newItems = data.items.filter(function (fetchedItem) {
 
+            // So, try to find the suposed new item inside the current feed item list.
             var foundItemInsideFeed = instance._findItem(data.feed, fetchedItem);
 
+            // If you found it, that item is not new, so skip it
+            // returning a false value.
             if (foundItemInsideFeed) {
@@ -267,2 +450,4 @@
 
+            // But if we couldn't find it, this means it is a new item and we need
+            // to add it to the newItems array. To do this, just return a truthy value.
             return fetchedItem;
@@ -272,2 +457,4 @@ });
 
+        // Now that we have all the new items, add them to the
+        // feed item list.
         function populateNewItemsInFeed(data) {
@@ -282,15 +469,46 @@
 
+      // Call the getContent function to already start getting
+      // content, otherwise you will have to wait for a
+      // setInterval cicle.
       getContent();
 
+      // Create and return the setInterval itself.
       return setInterval(getContent, feed.refresh);
     }
+
+    // This is the inverse of the _addToFeedList method
+    // and we will destroy the setInterval and remove
+    // the feed from the feedList.
+
   }, {
+    key: '_removeFromFeedList',
+    value: function _removeFromFeedList(feed) {
+
+      if (!feed) {
+
+        return;
+      }
+
+      clearInterval(feed.setInterval);
+      _.remove(this._feedList, { url: feed.url });
+    }
+
+    // Add a feed item to its item list.
+
+  }, {
     key: '_addItemToItemList',
     value: function _addItemToItemList(feed, item) {
 
+      // Push them to the items array.
       feed.items.push(item);
+
+      // Keep the max history length in control.
       feed.items = _.takeRight(feed.items, feed.maxHistoryLength);
 
+      // And emit the "new-item" event of this item.
       this.emit('new-item', item);
     }
+
+    // This is where the http request happens.
+
   }, {
@@ -300,6 +518,11 @@ key: '_fetchFeed',
 
+      // Remember the above Promise chain? Everything starts here.
       return new _bluebird2.default(function (resolve, reject) {
 
+        // Create a FeedParser instance.
         var feedparser = new _feedparser2.default();
 
+        // Create that "data" object we used over and over inside
+        // the getContent Promise chain. It starts with a feed url
+        // property and a blank item array.
         var data = {
@@ -310,2 +533,4 @@ feedUrl: feedUrl,
 
+        // Now let's request that feed URL sending a very nice header
+        // because some servers doesn't like requests without it.
         _request2.default.get({
@@ -317,4 +542,15 @@ url: feedUrl,
           }
-        }).on('response', requestOnResponse).on('error', requestOnError).pipe(feedparser).on('end', finish);
+        })
+        // Run this once we get a response from the server.
+        .on('response', requestOnResponse)
+        // If the request is rejected, call this function.
+        .on('error', requestOnError)
+        // If everything is ok, let's parse the feed.
+        .pipe(feedparser)
+        // and in the end, let's call the finish function.
+        .on('end', finish);
 
+        // Basically what we do here is, if we doesn't get a "200" status
+        // code from the request, reject the promise because probably we
+        // received something like a "404" or "500" error.
         function requestOnResponse(res) {
@@ -336,2 +572,4 @@
 
+        // This will happen when Node.js itself couldn't connet
+        // to the host to get something from it.
         function requestOnError(responseError) {
@@ -352,16 +590,23 @@
 
-        function finish() {
-
-          resolve(data);
-        }
-
+        // Everytime the Feedparser emits a "readable" event
+        // we have a new feed item, so we need to add it to the
+        // data.item list.
         feedparser.on('readable', function () {
 
+          // Read the item itself.
           var item = feedparser.read();
 
-          // Force the feed URL inside the feed item
+          // Force the feed URL inside the feed item because
+          // some times the RSS doesn't have the feed url inside
+          // every item.
           item.meta.link = feedUrl;
+
+          // Add to the data.items.
           data.items.push(item);
         });
 
+        // Feedparser will also emit an "error" event
+        // if it's not able to parse the XML. If this
+        // happens, we need to interrupt the Promise chain
+        // since we can't keep going further.
         feedparser.on('error', function () {
@@ -378,2 +623,9 @@
         });
+
+        // Once finished, let's resolve the Promise
+        // with the "data" object.
+        function finish() {
+
+          resolve(data);
+        }
       });
@@ -386,3 +638,6 @@ }
 
+// In the end, just export the RssFeedEmitter class.
+
+
 exports.default = RssFeedEmitter;
 module.exports = exports['default'];

package.json

 {
   "name": "rss-feed-emitter",
-  "version": "1.0.3",
+  "version": "1.0.4",
   "description": "Super RSS News Feed aggregator written in Node.js and ES6",
@@ -5,0 +5,0 @@ "main": "dist/rss-feed-emitter.js",

README.md

@@ -15,5 +15,2 @@ <p align="center">
   <a href="https://www.npmjs.com/package/rss-feed-emitter">
-    <img src="https://david-dm.org/filipedeschamps/rss-feed-emitter.svg">
-  </a>
-  <a href="https://www.npmjs.com/package/rss-feed-emitter">
     <img src="https://badge.fury.io/js/rss-feed-emitter.svg">
@@ -28,3 +25,22 @@ </a>
 
+## Tutorial
 
+This is a fully functional module, but its source code and repository are also a **super complete tutorial**, covering:
+
+ 1. What to do first when creating a module from scratch
+ 2. How to manage your module in Github and npm
+ 3. How to transpile your ES6 code into ES5
+ 4. How to create automated unit and integration tests
+ 5. How to integrate them with Travis CI and make the build break if tests didn't pass
+ 6. How to automatically test your module against various versions of Node.js
+ 7. How to setup a code coverage tool and keep 100% coverage
+ 8. How to integrate the coverage results with Code Climate
+ 9. How to configure linting tools to make your code base consistent
+ 10. How to deploy to Github and npm with tags and releases
+
+If you're afraid to read the source code of the modules you use or to create your first module, this is the best chance you have to break this barrier :)
+
+**[Start here](https://github.com/filipedeschamps/rss-feed-emitter/issues/119)**
+
+
 ## Features
@@ -38,4 +54,6 @@
 
+
 ## Usage
 
+
 ### Install
@@ -47,2 +65,3 @@
 
+
 ### Creating an instance
@@ -55,2 +74,3 @@
 
+
 ### Adding feeds
@@ -67,2 +87,3 @@
 
+
 ### Listening to new items
@@ -76,2 +97,3 @@
 
+
 ### Listing all feeds in the instance
@@ -82,2 +104,3 @@ ``` js
 
+
 ### Removing a single feed
@@ -89,2 +112,3 @@
 
+
 ### Destroying feed instance
@@ -91,0 +115,0 @@

No alert changes

Improved metrics

Number of lines in readme file

111

increased by27.59%

Worsened metrics

Total package byte prevSize

83384

decreased by-25.59%

Number of package files

14

decreased by-17.65%

Lines of code

870

decreased by-0.23%

No dependency changes