feat: download artist's top tracks with --limit flag

internal/downloader/client.go

@@ -57,6 +57,8 @@ func (c *Client) Run(ctx context.Context, opts Options, id string) error {
 		resource = &deezer.Album{}
 	case "playlist":
 		resource = &deezer.Playlist{}
+	case "artist":
+		resource = &deezer.Artist{}
 	default:
 		return fmt.Errorf("unsupported resource type: %s", c.resourceType)
 	}
@@ -69,6 +71,10 @@ func (c *Client) Run(ctx context.Context, opts Options, id string) error {
 	if len(songs) == 0 {
 		return fmt.Errorf("%s has no songs", c.resourceType)
 	}
+	if opts.Limit > 0 && len(songs) > opts.Limit {
+		songs = songs[:opts.Limit]
+		resource.SetSongs(songs)
+	}
 
 	rootOutputDir := c.appConfig.OutputDir
 	resourceOutputDir := resource.GetOutputDir(rootOutputDir)

internal/downloader/options.go

@@ -16,12 +16,16 @@ type Options struct {
 	Quality string
 	Timeout time.Duration
 	BPM     bool
+	Limit   int
 }
 
 func (o *Options) Validate() error {
 	if !validQualities[o.Quality] {
 		return fmt.Errorf("invalid quality option: %s", o.Quality)
 	}
+	if o.Limit < 0 {
+		return fmt.Errorf("limit must be a non-negative integer")
+	}
 
 	return nil
 }