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: tree.go
    path of file: ./repos/glide/action
    
    the code of the file until where you have to start completion: package action

import (
	"container/list"
	"os"

	"github.com/Masterminds/glide/msg"
	"github.com/Masterminds/glide/tree"
	"github.com/Masterminds/glide/util"
)

// Tree prints a tree repr
    
func Tree(basedir string, showcore bool) {
	msg.Warn("The tree command is deprecated and will be removed in a future version")
	buildContext, err := util.GetBuildContext()
	if err != nil {
		msg.Die("Failed to get a build context: %s", err)
	}
	myName := buildContext.PackageName(basedir)

	if basedir == "." {
		var err error
		basedir, err = os.Getwd()
		if err != nil {
			msg.Die("Could not get working directory")
		}
	}

	msg.Puts(myName)
	l := list.New()
	l.PushBack(myName)
	tree.Display(buildContext, basedir, myName, 1, showcore, l)
}