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file.go
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file.go
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package file
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strings"
"github.com/pkg/errors"
)
func FileEqual(filename1, filename2 string) error {
file1, err := ioutil.ReadFile(filename1)
if err != nil {
return err
}
file2, err := ioutil.ReadFile(filename2)
if err != nil {
return err
}
if len(file1) != len(file2) {
return errors.Errorf("different len, len(%s) = %d, len(%s) = %d", filename1, len(file1), filename2, len(file2))
}
ret := bytes.Equal(file1, file2)
if !ret {
for i := 0; i < len(file1); i++ {
if file1[i] != file2[i] {
return errors.Errorf("first diffrent char is %d at position %d", file1[i], i)
}
}
}
return nil
}
func ReplaceFileSuffix(filename, newSuffix string) string {
return fmt.Sprintf("%s.%s", RemoveFileSuffix(filename), newSuffix)
}
func RemoveFileSuffix(filename string) string {
base := filepath.Base(filename)
ext := filepath.Ext(base)
return strings.TrimSuffix(filename, ext)
}
func Ext(path string) string {
for i := len(path) - 1; i >= 0 && !os.IsPathSeparator(path[i]); i-- {
if path[i] == '.' {
return path[i:]
}
}
return ""
}
func GetCurrentPath() string {
s, _ := exec.LookPath(os.Args[0])
i := strings.LastIndex(s, "\\")
path := string(s[0 : i+1])
return path
}
func RemoveExistFiles(filenames []string) error {
for i := 0; i < len(filenames); i++ {
err := RemoveExistFile(filenames[i])
if err != nil {
return err
}
}
return nil
}
func RemoveExistFile(filename string) error {
ok, _ := PathOrFileIsExist(filename)
if ok {
err := os.Remove(filename)
if err != nil {
return err
}
}
return nil
}
func PathOrFileIsExist(pathOrFile string) (bool, error) {
_, err := os.Stat(pathOrFile)
if err == nil {
return true, nil
}
if os.IsNotExist(err) {
return false, nil
}
return false, err
}
func AppendFile(filename string, data []byte, perm os.FileMode) error {
f, err := os.OpenFile(filename, os.O_WRONLY|os.O_APPEND, perm)
if err != nil {
return err
}
n, err := f.Write(data)
if err == nil && n < len(data) {
err = io.ErrShortWrite
}
if err1 := f.Close(); err == nil {
err = err1
}
return err
}
func CopyFile(dstFileName, srcFileName string) (int64, error) {
src, err := os.Open(srcFileName)
if err != nil {
return 0, err
}
defer src.Close()
dst, err := os.OpenFile(dstFileName, os.O_WRONLY|os.O_CREATE, 0x777)
if err != nil {
return 0, err
}
defer dst.Close()
return io.Copy(dst, src)
}