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: run.go
    path of file: ./repos/up/internal/cli/run
    
    the code of the file until where you have to start completion: package run

import (
	"github.com/apex/up/internal/cli/root"
	"github.com/apex/up/internal/stats"
	"github.com/apex/up/internal/util"
	"github.com/pkg/errors"
	"github.com/tj/kingpin"
)

func init() {
	cmd := root.Command("run", "Run a hook.")
	cmd.Example(`up run build`, "Run build hook.")
	cmd.Example(`up run clean`, "Run clean hook.")

	hook := cmd.Arg("hook", 
    
func init() {
	cmd := root.Command("run", "Run a hook.")
	cmd.Example(`up run build`, "Run build hook.")
	cmd.Example(`up run clean`, "Run clean hook.")

	hook := cmd.Arg("hook", "Name of the hook to run.").Required().String()
	stage := cmd.Flag("stage", "Target stage name.").Short('s').Default("staging").String()

	cmd.Action(func(_ *kingpin.ParseContext) error {
		_, p, err := root.Init()
		if err != nil {
			return errors.Wrap(err, "initializing")
		}

		defer util.Pad()()

		stats.Track("Hook", map[string]interface{}{
			"name": *hook,
		})

		if err := p.Init(*stage); err != nil {
			return errors.Wrap(err, "initializing")
		}

		return p.RunHook(*hook)
	})
}