95 lines
1.8 KiB
Go
95 lines
1.8 KiB
Go
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package main
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import (
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"fmt"
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"os"
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)
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// Формирует файл /var/result/data.txt так,
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// что каждая строка файла - количество символов в именах файлов из каталога /var/data.
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const INPUT = "/var/data"
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const OUTPUT = "/data/result"
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func GetListFilesInDirectory(directory string) ([]string, error) {
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f, err := os.Open(directory)
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if err != nil {
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fmt.Println(err)
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return nil, err
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}
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files, err := f.Readdir(0)
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if err != nil {
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fmt.Println(err)
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return nil, err
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}
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var fileNames []string
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for _, file := range files {
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fileName := file.Name()
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fileNames = append(fileNames, fileName)
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}
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return fileNames, nil
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}
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func Exists(name string) (bool, error) {
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_, err := os.Stat(name)
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if os.IsNotExist(err) {
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return false, nil
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}
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return err != nil, err
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}
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func CreateFileOrOpenIfExist(name string) (*os.File, error) {
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exists, err := Exists(name)
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if err != nil {
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return nil, err
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}
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if exists {
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return os.OpenFile(name, os.O_WRONLY|os.O_CREATE, 0664)
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}
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return os.Create(name)
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}
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func CreateFileAndWriteData(filename string, lines []string) error {
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file, err := CreateFileOrOpenIfExist(filename)
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if err != nil {
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return err
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}
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for _, line := range lines {
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_, err = fmt.Fprintf(file, line)
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if err != nil {
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return err
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}
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}
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err = file.Close()
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if err != nil {
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return err
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}
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return nil
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}
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func main() {
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filenames, err := GetListFilesInDirectory(INPUT)
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if err != nil {
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fmt.Println(err)
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return
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}
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var lenghtOfFilenames []string
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for _, filename := range filenames {
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fmt.Println(filename)
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lenghtOfFilenames = append(lenghtOfFilenames, fmt.Sprintf("%d", len(filename)))
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}
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err = CreateFileAndWriteData(OUTPUT+"/data.txt", filenames)
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if err != nil {
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return
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}
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fmt.Println("First Service is end.")
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}
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