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undefer.go
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undefer.go
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package undefer
import (
"fmt"
"io"
"os"
"path/filepath"
"regexp"
"sort"
"strconv"
"time"
"github.com/pkg/errors"
)
var dateRE = regexp.MustCompile(`^(\d{4})-(\d\d)-(\d\d)`)
func newFiles(dir string, files []os.FileInfo, now time.Time) ([]string, error) {
ret := make([]string, 0, len(files))
for _, file := range files {
matches := dateRE.FindStringSubmatch(file.Name())
if len(matches) != 4 {
continue
}
year, err := strconv.Atoi(matches[1])
if err != nil {
return nil, errors.Wrap(err, "couldn't parse "+file.Name())
}
month, err := strconv.Atoi(matches[2])
if err != nil {
return nil, errors.Wrap(err, "couldn't parse "+file.Name())
}
day, err := strconv.Atoi(matches[3])
if err != nil {
return nil, errors.Wrap(err, "couldn't parse "+file.Name())
}
then := time.Date(year, time.Month(month), day, 0, 0, 0, 0, time.Local)
if then.After(now) {
continue
}
ret = append(ret, filepath.Join(dir, file.Name()))
}
sort.Strings(ret)
return ret, nil
}
func content(paths []string, stdout io.Writer) error {
for _, path := range paths {
file, err := os.Open(path)
if err != nil {
return errors.Wrap(err, "couldn't Open")
}
_, err = io.Copy(stdout, file)
if err != nil {
return errors.Wrap(err, "couldn't Copy")
}
err = file.Close()
if err != nil {
return errors.Wrap(err, "couldn't Close")
}
err = os.Remove(path)
if err != nil {
return errors.Wrap(err, "couldn't Remove")
}
}
return nil
}
// Run prints the contents of files in the passed directory that have a
// prefix of a date in the past, and then deletes the files.
func Run(args []string, _ io.Reader) error {
if len(args) > 2 {
fmt.Fprintf(os.Stderr, "Usage: %s $dir\n", args[0])
os.Exit(1)
}
dir, err := os.Open(args[1])
if err != nil {
return errors.Wrap(err, "Couldn't Open")
}
files, err := dir.Readdir(-1)
if err != nil {
return errors.Wrap(err, "Couldn't ReadDir")
}
paths, err := newFiles(args[1], files, time.Now())
if err != nil {
return errors.Wrap(err, "Couldn't get newFiles")
}
err = content(paths, os.Stdout)
if err != nil {
return errors.Wrap(err, "Couldn't write content")
}
return nil
}