You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: command_s3_bucket_list.go
    path of file: ./repos/seaweedfs/weed/shell
    
    the code of the file until where you have to start completion: package shell

import (
	"context"
	"flag"
	"fmt"
	"io"
	"math"

	"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
)

func init() {
	Commands = append(Commands, &commandS3BucketList{})
}

type commandS3BucketList struct {
}

func (c *commandS3BucketList) Name() string {
	return "s3.bucket.list"
}

func (c *commandS3BucketList) Help() string {
	return `list all buckets

`
}


    
func readFilerBucketsPath(filerClient filer_pb.FilerClient) (filerBucketsPath string, err error) {
	err = filerClient.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {

		resp, err := client.GetFilerConfiguration(context.Background(), &filer_pb.GetFilerConfigurationRequest{})
		if err != nil {
			return fmt.Errorf("get filer configuration: %v", err)
		}
		filerBucketsPath = resp.DirBuckets

		return nil

	})

	return filerBucketsPath, err
}