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: helpers.go
    path of file: ./repos/sliver/client/command/sessions
    
    the code of the file until where you have to start completion: package sessions

/*
	Sliver Implant Framework
	Copyright (C) 2021  Bishop Fox

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"sort"
	"strings"
	"text/tabwriter"

	"github.com/AlecAivazis/survey/v2"
	"github.com/bishopfox/sliver/client/console"
	"github.com/bishopfox/sliver/protobuf/clientpb"
	"github.com/bishopfox/sliver/protobuf/com
    
func SelectSession(onlyAlive bool, con *console.SliverClient) (*clientpb.Session, error) {
	sessions, err := con.Rpc.GetSessions(context.Background(), &commonpb.Empty{})
	if err != nil {
		return nil, err
	}
	if len(sessions.Sessions) == 0 {
		return nil, ErrNoSessions
	}

	sessionsMap := map[string]*clientpb.Session{}
	for _, session := range sessions.GetSessions() {
		sessionsMap[session.ID] = session
	}

	// Sort the keys because maps have a randomized order, these keys must be ordered for the selection
	// to work properly since we rely on the index of the user's selection to find the session in the map
	var keys []string
	for _, session := range sessions.Sessions {
		keys = append(keys, session.ID)
	}
	sort.Strings(keys)

	outputBuf := bytes.NewBufferString("")
	table := tabwriter.NewWriter(outputBuf, 0, 2, 2, ' ', 0)

	// Column Headers
	for _, key := range keys {
		session := sessionsMap[key]
		if onlyAlive && session.IsDead {
			continue
		}
		fmt.Fprintf(table, "%s\t%s\t%s\t%s\t%s\t%s\n",
			session.ID,
			session.Name,
			session.RemoteAddress,
			session.Hostname,
			session.Username,
			fmt.Sprintf("%s/%s", session.OS, session.Arch),
		)
	}
	table.Flush()

	options := strings.Split(outputBuf.String(), "\n")
	options = options[:len(options)-1] // Remove the last empty option
	prompt := &survey.Select{
		Message: "Select a session:",
		Options: options,
	}
	selected := ""
	survey.AskOne(prompt, &selected)
	if selected == "" {
		return nil, ErrNoSelection
	}

	// Go from the selected option -> index -> session
	for index, option := range options {
		if option == selected {
			return sessionsMap[keys[index]], nil
		}
	}
	return nil, ErrNoSelection
}