implemented fetch call

internal/cli/shell.go

@@ -65,6 +65,7 @@ func Shell() {
 	fmt.Println("== MusicKraken Shell ==")
 	fmt.Println()
 
+	currentMusicObjects := []data.MusicObject{}
 	for {
 		fmt.Print("> ")
 
@@ -75,13 +76,35 @@ func Shell() {
 			return
 		}
 
-		searchResults, err := plugin.Search(line, plugin.SearchConfig{IgnoreErrors: false})
-		if err != nil {
-			fmt.Println(err)
-			fmt.Println()
+		line = strings.TrimSpace(line)
+
+		if index, err := strconv.Atoi(line); err == nil {
+			if index >= len(currentMusicObjects) {
+				fmt.Println("\n" + line + " is out of bounds")
+				continue
+			}
+
+			current := currentMusicObjects[index]
+
+			if len(current.GetSources()) <= 0 {
+				fmt.Println("\nselected has no sources to download")
+				continue
+			}
+
+			currentMusicObjects, err = plugin.FetchList(current.GetSources()[0])
+			if err != nil {
+				fmt.Println(err)
+				fmt.Println()
+			}
+		} else {
+			currentMusicObjects, err = plugin.Search(line, plugin.SearchConfig{IgnoreErrors: false})
+			if err != nil {
+				fmt.Println(err)
+				fmt.Println()
+			}
 		}
 
 		fmt.Println()
-		printResults(searchResults)
+		printResults(currentMusicObjects)
 	}
 }