learngo/17-project-empty-file-finder/exercises/2-sort-to-a-file-2/solution/main.go

// Copyright © 2018 Inanc Gumus
// Learn Go Programming Course
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
//
// For more tutorials  : https://learngoprogramming.com
// In-person training  : https://www.linkedin.com/in/inancgumus/
// Follow me on twitter: https://twitter.com/inancgumus

package main

import (
	"fmt"
	"io/ioutil"
	"os"
	"sort"
	"strconv"
)

func main() {
	items := os.Args[1:]
	if len(items) == 0 {
		fmt.Println("Send me some items and I will sort them")
		return
	}

	sort.Strings(items)

	var data []byte
	for i, s := range items {
		data = strconv.AppendInt(data, int64(i+1), 10)
		data = append(data, '.', ' ')
		data = append(data, s...)
		data = append(data, '\n')
	}

	err := ioutil.WriteFile("sorted.txt", data, 0644)
	if err != nil {
		fmt.Println(err)
		return
	}
}