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: checkout.go
    path of file: ./repos/gitbatch/internal/command
    
    the code of the file until where you have to start completion: package command

import (
	"os/exec"

	"github.com/isacikgoz/gitbatch/internal/git"
)

// CheckoutOptions defines the rules of checkout command
type CheckoutOptions struct {
	TargetRef      string
	CreateIfAbsent bool
	CommandMode    Mode
}

// Checkout is a wrapper function for "git checkout" command.
func Checkout(r *git.Repository, o *CheckoutOptions) error {
	var branch *git.Branch
	for _, b := range r.Branches {
		if b.Name == o.TargetRef {
			branch = b
			break
		}
	}
	msg := "checkout in progress"
	if branch != nil {
		if err := r.Checkout(branch); err != nil {
			r.SetWorkStatus(git.Fail)
			msg = err.Error()
		} else {
			r.SetWorkStatus(git.Success)
			msg = "switched to 
    
func Checkout(r *git.Repository, o *CheckoutOptions) error {
	var branch *git.Branch
	for _, b := range r.Branches {
		if b.Name == o.TargetRef {
			branch = b
			break
		}
	}
	msg := "checkout in progress"
	if branch != nil {
		if err := r.Checkout(branch); err != nil {
			r.SetWorkStatus(git.Fail)
			msg = err.Error()
		} else {
			r.SetWorkStatus(git.Success)
			msg = "switched to " + o.TargetRef
		}
	} else if o.CreateIfAbsent {
		args := []string{"checkout", "-b", o.TargetRef}
		cmd := exec.Command("git", args...)
		cmd.Dir = r.AbsPath
		_, err := cmd.CombinedOutput()
		if err != nil {
			r.SetWorkStatus(git.Fail)
			msg = err.Error()
		} else {
			r.SetWorkStatus(git.Success)
			msg = "switched to " + o.TargetRef
		}
	}
	r.State.Message = msg
	return r.Refresh()
}