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file.go
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file.go
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// Copyright 2013 com authors
//
// Licensed under the Apache License, Version 2.0 (the "License"): you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.
package com
import (
"archive/tar"
"archive/zip"
"compress/gzip"
"io"
"io/ioutil"
"os"
"path"
)
// get filepath base name
func Basename(file string) string {
return path.Base(file)
}
// get filepath dir name
func Dirname(file string) string {
return path.Dir(file)
}
// get absolute filepath, based on built executable file
func RealPath(file string) (string, error) {
if path.IsAbs(file) {
return file, nil
}
wd, err := os.Getwd()
return path.Join(wd, file), err
}
// get file modified time
func FileMTime(file string) (int64, error) {
f, e := os.Stat(file)
if e != nil {
return 0, e
}
return f.ModTime().Unix(), nil
}
// get file size as how many bytes
func FileSize(file string) (int64, error) {
f, e := os.Stat(file)
if e != nil {
return 0, e
}
return f.Size(), nil
}
// Copy copies file from source to target path.
// It returns false and error when error occurs in underlying functions.
func Copy(file string, to string) (bool, error) {
sf, e := os.Open(file)
if e != nil {
return false, e
}
defer sf.Close()
df, e2 := os.Create(to)
if e2 != nil {
return false, e2
}
defer df.Close()
// buffer reader, do chunk transfer
buf := make([]byte, 1024)
for {
// read a chunk
n, err := sf.Read(buf)
if err != nil && err != io.EOF {
return false, err
}
if n == 0 {
break
}
// write a chunk
if _, err := df.Write(buf[:n]); err != nil {
return false, err
}
}
return true, nil
}
// move file to new path
func Move(file string, to string) (bool, error) {
// copy
r, e := Copy(file, to)
if e != nil {
return r, e
}
// then remove
e = os.Remove(file)
if e != nil {
r = false
}
return r, e
}
// delete file
func Unlink(file string) error {
return os.Remove(file)
}
// rename file name
func Rename(file string, to string) error {
return os.Rename(file, to)
}
// IsFile checks whether the path is a file,
// it returns false when it's a directory or does not exist.
func IsFile(filePath string) bool {
f, e := os.Stat(filePath)
if e != nil {
return false
}
return !f.IsDir()
}
// IsExist checks whether a file or directory exists.
// It returns false when the file or directory does not exist.
func IsExist(path string) bool {
_, err := os.Stat(path)
return err == nil || os.IsExist(err)
}
// SaveFile saves content type '[]byte' to file by given path.
// It returns error when fail to finish operation.
func SaveFile(filePath string, b []byte) (int, error) {
os.MkdirAll(path.Dir(filePath), os.ModePerm)
fw, err := os.Create(filePath)
if err != nil {
return 0, err
}
defer fw.Close()
return fw.Write(b)
}
// SaveFileS saves content type 'string' to file by given path.
// It returns error when fail to finish operation.
func SaveFileS(filePath string, s string) (int, error) {
return SaveFile(filePath, []byte(s))
}
// ReadFile reads data type '[]byte' from file by given path.
// It returns error when fail to finish operation.
func ReadFile(filePath string) ([]byte, error) {
b, err := ioutil.ReadFile(filePath)
if err != nil {
return []byte(""), err
}
return b, nil
}
// ReadFileS reads data type 'string' from file by given path.
// It returns error when fail to finish operation.
func ReadFileS(filePath string) (string, error) {
b, err := ReadFile(filePath)
return string(b), err
}
// Unzip unzips .zip file to 'destPath' and returns sub-directories.
// It returns error when fail to finish operation.
func Unzip(srcPath, destPath string) ([]string, error) {
// Open a zip archive for reading
r, err := zip.OpenReader(srcPath)
if err != nil {
return nil, err
}
defer r.Close()
dirs := make([]string, 0, 5)
// Iterate through the files in the archive
for _, f := range r.File {
// Get files from archive
rc, err := f.Open()
if err != nil {
return nil, err
}
dir := path.Dir(f.Name)
// Create directory before create file
os.MkdirAll(destPath+"/"+dir, os.ModePerm)
dirs = AppendStr(dirs, dir)
if f.FileInfo().IsDir() {
continue
}
// Write data to file
fw, _ := os.Create(path.Join(destPath, f.Name))
if err != nil {
return nil, err
}
_, err = io.Copy(fw, rc)
if fw != nil {
fw.Close()
}
if err != nil {
return nil, err
}
}
return dirs, nil
}
// UnTarGz ungzips and untars .tar.gz file to 'destPath' and returns sub-directories.
// It returns error when fail to finish operation.
func UnTarGz(srcFilePath string, destDirPath string) ([]string, error) {
// Create destination directory
os.Mkdir(destDirPath, os.ModePerm)
fr, err := os.Open(srcFilePath)
if err != nil {
return nil, err
}
defer fr.Close()
// Gzip reader
gr, err := gzip.NewReader(fr)
if err != nil {
return nil, err
}
defer gr.Close()
// Tar reader
tr := tar.NewReader(gr)
dirs := make([]string, 0, 5)
for {
hdr, err := tr.Next()
if err == io.EOF {
// End of tar archive
break
}
// Check if it is directory or file
if hdr.Typeflag != tar.TypeDir {
// Get files from archive
// Create directory before create file
dir := path.Dir(hdr.Name)
os.MkdirAll(destDirPath+"/"+dir, os.ModePerm)
dirs = AppendStr(dirs, dir)
// Write data to file
fw, _ := os.Create(destDirPath + "/" + hdr.Name)
if err != nil {
return nil, err
}
_, err = io.Copy(fw, tr)
if err != nil {
return nil, err
}
}
}
return dirs, nil
}