add exporter offset

internal/cmd_export.go

@@ -9,8 +9,10 @@ import (
 )
 
 var (
-	channelID    int64
-	channelAlias string
+	channelID     int64
+	offsetID      int
+	channelAlias  string
+	downloadMedia bool
 )
 
 func ExportCmd() *cobra.Command {
@@ -35,12 +37,19 @@ func ExportCmd() *cobra.Command {
 					return err
 				}
 			}
-			return client.Channel(ctx, channel, 0)
+
+			if downloadMedia {
+				client.WithMedia()
+			}
+
+			return client.Channel(ctx, channel, offsetID)
 		}),
 	}
 
 	cmd.Flags().Int64Var(&channelID, "channel", 0, "channel id")
+	cmd.Flags().IntVar(&offsetID, "offset", 0, "offset id")
 	cmd.Flags().StringVar(&channelAlias, "alias", "", "channel alias")
+	cmd.Flags().BoolVar(&downloadMedia, "media", false, "download media")
 
 	return cmd
 }