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handle.go
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handle.go
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package zfile
import (
"bufio"
"io"
"io/ioutil"
"os"
"path/filepath"
)
// CopyDir copies the source directory to the dest directory.
func CopyDir(source string, dest string, filterFn ...func(srcFilePath, destFilePath string) bool) (err error) {
info, err := os.Stat(source)
if err != nil {
return err
}
err = os.MkdirAll(dest, info.Mode())
if err != nil {
return err
}
directory, err := os.Open(source)
if err != nil {
return err
}
defer directory.Close()
objects, err := directory.Readdir(-1)
if err != nil {
return err
}
var filter func(srcFilePath, destFilePath string) bool
if len(filterFn) > 0 {
filter = filterFn[0]
}
copySum := len(objects)
for _, obj := range objects {
srcFilePath := filepath.Join(source, obj.Name())
destFilePath := filepath.Join(dest, obj.Name())
if obj.IsDir() {
_ = CopyDir(srcFilePath, destFilePath, filterFn...)
} else if filter == nil || filter(srcFilePath, destFilePath) {
_ = CopyFile(srcFilePath, destFilePath)
} else {
copySum--
}
}
if copySum < 1 {
Rmdir(dest)
}
return nil
}
// ReadFile ReadFile
func ReadFile(path string) ([]byte, error) {
path = RealPath(path)
return ioutil.ReadFile(path)
}
// ReadLineFile ReadLineFile
func ReadLineFile(path string, handle func(line int,
data []byte) error) (err error) {
var f *os.File
f, err = os.Open(RealPath(path))
if err != nil {
return
}
defer f.Close()
rd := bufio.NewReader(f)
i := 0
for {
i++
line, lerr := rd.ReadBytes('\n')
if lerr != nil || io.EOF == lerr {
break
}
if err = handle(i, line); err != nil {
break
}
}
return
}
// WriteFile WriteFile
func WriteFile(path string, b []byte, isAppend ...bool) (err error) {
var file *os.File
path = RealPath(path)
if FileExist(path) {
if len(isAppend) > 0 && isAppend[0] {
file, err = os.OpenFile(path, os.O_APPEND|os.O_WRONLY, os.ModeAppend)
} else {
file, err = os.OpenFile(path, os.O_WRONLY|os.O_TRUNC, os.ModeExclusive)
}
} else {
_ = RealPathMkdir(filepath.Dir(path))
file, err = os.Create(path)
}
if err != nil {
return err
}
defer file.Close()
_, err = file.Write(b)
return err
}
// PutOffset open the specified file and write data from the specified location
func PutOffset(path string, b []byte, offset int64) (err error) {
var file *os.File
path = RealPath(path)
if FileExist(path) {
file, err = os.OpenFile(path, os.O_WRONLY, os.ModeAppend)
} else {
file, err = os.Create(path)
}
if err != nil {
return err
}
defer file.Close()
_, err = file.WriteAt(b, offset)
return err
}
// PutAppend open the specified file and write data at the end of the file
func PutAppend(path string, b []byte) (err error) {
var file *os.File
path = RealPath(path)
if FileExist(path) {
file, err = os.OpenFile(path, os.O_APPEND|os.O_WRONLY, os.ModeAppend)
} else {
_ = RealPathMkdir(filepath.Dir(path))
file, err = os.Create(path)
}
if err != nil {
return err
}
defer file.Close()
_, err = file.Write(b)
return err
}