return errors from helper function

cmd/root.go

@@ -37,27 +37,31 @@ func formatItem(item *gofeed.Item, tmpl *template.Template) (string, error) {
 	return html.UnescapeString(b.String()), err
 }
 
-func parseFeeds(urls []string) []*gofeed.Feed {
+func parseFeeds(urls []string) ([]*gofeed.Feed, []error) {
 	fp := gofeed.NewParser()
 	var feedChs []chan *gofeed.Feed
+	var errChs []chan error
+
 	for _, url := range urls {
-		ch := make(chan *gofeed.Feed)
+		feedCh := make(chan *gofeed.Feed)
+		errCh := make(chan error)
 		go func(url string) {
 			feed, err := fp.ParseURL(url)
-			if err != nil {
-				log.Fatal(err)
-			}
-			ch <- feed
+			feedCh <- feed
+			errCh <- err
 		}(url)
-		feedChs = append(feedChs, ch)
+		feedChs = append(feedChs, feedCh)
+		errChs = append(errChs, errCh)
 	}
 
 	var feeds []*gofeed.Feed
-	for _, feedCh := range feedChs {
-		feeds = append(feeds, <-feedCh)
+	var errs []error
+	for i := range feedChs {
+		feeds = append(feeds, <-feedChs[i])
+		errs = append(errs, <-errChs[i])
 	}
 
-	return feeds
+	return feeds, errs
 }
 
 func rssfetch(cmd *cobra.Command, urls []string) {
@@ -66,7 +70,13 @@ func rssfetch(cmd *cobra.Command, urls []string) {
 		log.Fatal(err)
 	}
 
-	feeds := parseFeeds(urls)
+	feeds, errs := parseFeeds(urls)
+	for _, err := range errs {
+		if err != nil {
+			log.Fatal(err)
+		}
+	}
+
 	for _, feed := range feeds {
 		for _, item := range feed.Items {
 			out, err := formatItem(item, tmpl)