From 01392a2c20ef072cac7c12a1472ccc8feb7d20ba Mon Sep 17 00:00:00 2001
From: Amaury Joly <joly.amaury@hotmail.fr>
Date: Mon, 8 Mar 2021 09:26:38 +0100
Subject: [PATCH] add newEntries event

---
 src/listener-rss.ts | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/listener-rss.ts b/src/listener-rss.ts
index 23f1c07..d2c1bca 100644
--- a/src/listener-rss.ts
+++ b/src/listener-rss.ts
@@ -17,6 +17,7 @@ export class ListenerRss extends EventEmitter {
   // private fields
   parser: Parser;
   loopRunning: boolean = false;
+  lastEntriesLinks: string[] = [];
 
   /**
    * @brief constructor
@@ -66,7 +67,22 @@ export class ListenerRss extends EventEmitter {
 
     const fun: () => void = () => {
       this.fetchRSS()
-        .then((obj: { [key: string]: any }) => this.emit("update", obj))
+        .then((obj: { [key: string]: any }) => {
+          this.emit("update", obj);
+          const updatedEntriesLinks = obj.items.map(
+            (item: { link: string }) => item.link
+          );
+
+          const newEntries = obj.items.filter(
+            (item: { link: string }) =>
+              !this.lastEntriesLinks.includes(item.link)
+          );
+
+          if (this.lastEntriesLinks.length !== 0 && newEntries.length !== 0) {
+            this.emit("newEntries", newEntries);
+          }
+          this.lastEntriesLinks = updatedEntriesLinks;
+        })
         .catch((err) => this.emit("error", err));
     };