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: runner.go
    path of file: ./repos/kubeedge/vendor/k8s.io/kubernetes/cmd/kubeadm/app/cmd/phases/workflow
    
    the code of the file until where you have to start completion: /*
Copyright 2018 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package workflow

import (
	"fmt"
	"strings"

	"github.com/pkg/errors"
	"github.com/spf13/cobra"
	"github.com/spf13/pflag"
)

// phaseSeparator defines the separator to be used when concatenating nested
// phase names
const phaseSeparator = "/"

// RunnerOptions defines the options supported during the execution of a
// kubeadm composable workflows
type RunnerOptions struct {
	// FilterPhases defines the list of phases to be executed (if empty, all).
	FilterPhases []string

	// SkipPhases defi
    
func (e *Runner) Help(cmdUse string) string {
	e.prepareForExecution()

	// computes the max length of for each phase use line
	maxLength := 0
	e.visitAll(func(p *phaseRunner) error {
		if !p.Hidden && !p.RunAllSiblings {
			length := len(p.use)
			if maxLength < length {
				maxLength = length
			}
		}
		return nil
	})

	// prints the list of phases indented by level and formatted using the maxlength
	// the list is enclosed in a mardown code block for ensuring better readability in the public web site
	line := fmt.Sprintf("The %q command executes the following phases:\n", cmdUse)
	line += "```\n"
	offset := 2
	e.visitAll(func(p *phaseRunner) error {
		if !p.Hidden && !p.RunAllSiblings {
			padding := maxLength - len(p.use) + offset
			line += strings.Repeat(" ", offset*p.level) // indentation
			line += p.use                               // name + aliases
			line += strings.Repeat(" ", padding)        // padding right up to max length (+ offset for spacing)
			line += p.Short                             // phase short description
			line += "\n"
		}

		return nil
	})
	line += "```"
	return line
}