gfile

package
v2.0.0 Latest Latest
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 Go to latest Published: Sep 13, 2024 License: MulanPSL-2.0 Imports: 20 Imported by: 0

Documentation

Overview

Package gfile provides easy-to-use operations for file system.

Index

Examples

Constants

View Source 
const (
	// Separator for file system.
	// It here defines the separator as variable
	// to allow it modified by developer if necessary.
	Separator = string(filepath.Separator)

	// DefaultPermOpen is the default perm for file opening.
	DefaultPermOpen = os.FileMode(0666)

	// DefaultPermCopy is the default perm for file/folder copy.
	DefaultPermCopy = os.FileMode(0755)
)

Variables

View Source 
var (
	// DefaultReadBuffer is the buffer size for reading file content.
	DefaultReadBuffer = 1024
)

Functions

func Abs 

func Abs(path string) string

Abs returns an absolute representation of path. If the path is not absolute it will be joined with the current working directory to turn it into an absolute path. The absolute path name for a given file is not guaranteed to be unique. Abs calls Clean on the result.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		path = gfile.Join(gfile.Temp("gfile_example_basic_dir"), "file1")
	)

	// Get an absolute representation of path.
	fmt.Println(gfile.Abs(path))

	// May Output:
	// /tmp/gfile_example_basic_dir/file1
}

Output:

func Basename 

func Basename(path string) string

Basename returns the last element of path, which contains file extension. Trailing path separators are removed before extracting the last element. If the path is empty, Base returns ".". If the path consists entirely of separators, Basename returns a single separator.

Example: Basename("/var/www/file.js") -> file.js Basename("file.js") -> file.js

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		path = gfile.Pwd() + gfile.Separator + "testdata/readline/file.log"
	)

	// Get the last element of path, which contains file extension.
	fmt.Println(gfile.Basename(path))

}

Output:

file.log

func Chdir 

func Chdir(dir string) (err error)

Chdir changes the current working directory to the named directory. If there is an error, it will be of type *PathError.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		path = gfile.Join(gfile.Temp("gfile_example_basic_dir"), "file1")
	)
	// Get current working directory
	fmt.Println(gfile.Pwd())

	// Changes the current working directory to the named directory.
	gfile.Chdir(path)

	// Get current working directory
	fmt.Println(gfile.Pwd())

	// May Output:
	// xxx/gf/os/gfile
	// /tmp/gfile_example_basic_dir/file1
}

Output:

func Chmod 

func Chmod(path string, mode os.FileMode) (err error)

Chmod is alias of os.Chmod. See os.Chmod.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		path = gfile.Join(gfile.Temp("gfile_example_basic_dir"), "file1")
	)

	// Get a FileInfo describing the named file.
	stat, err := gfile.Stat(path)
	if err != nil {
		fmt.Println(err.Error())
	}
	// Show original mode
	fmt.Println(stat.Mode())

	// Change file model
	gfile.Chmod(path, gfile.DefaultPermCopy)

	// Get a FileInfo describing the named file.
	stat, _ = gfile.Stat(path)
	// Show the modified mode
	fmt.Println(stat.Mode())

}

Output:

-rw-r--r--
-rwxr-xr-x

func Copy 

func Copy(src string, dst string, option ...CopyOption) error

Copy file/directory from `src` to `dst`.

If `src` is file, it calls CopyFile to implements copy feature, or else it calls CopyDir.

If `src` is file, but `dst` already exists and is a folder, it then creates a same name file of `src` in folder `dst`.

Eg: Copy("/tmp/file1", "/tmp/file2") => /tmp/file1 copied to /tmp/file2 Copy("/tmp/dir1", "/tmp/dir2") => /tmp/dir1 copied to /tmp/dir2 Copy("/tmp/file1", "/tmp/dir2") => /tmp/file1 copied to /tmp/dir2/file1 Copy("/tmp/dir1", "/tmp/file2") => error

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		srcFileName = "gfile_example.txt"
		srcTempDir  = gfile.Temp("gfile_example_copy_src")
		srcTempFile = gfile.Join(srcTempDir, srcFileName)

		// copy file
		dstFileName = "gfile_example_copy.txt"
		dstTempFile = gfile.Join(srcTempDir, dstFileName)

		// copy dir
		dstTempDir = gfile.Temp("gfile_example_copy_dst")
	)

	// write contents
	gfile.PutContents(srcTempFile, "goframe example copy")

	// copy file
	gfile.Copy(srcTempFile, dstTempFile)

	// read contents after copy file
	fmt.Println(gfile.GetContents(dstTempFile))

	// copy dir
	gfile.Copy(srcTempDir, dstTempDir)

	// list copy dir file
	fList, _ := gfile.ScanDir(dstTempDir, "*", false)
	for _, v := range fList {
		fmt.Println(gfile.Basename(v))
	}

}

Output:

goframe example copy
gfile_example.txt
gfile_example_copy.txt

func CopyDir 

func CopyDir(src string, dst string, option ...CopyOption) (err error)

CopyDir recursively copies a directory tree, attempting to preserve permissions.

Note that, the Source directory must exist and symlinks are ignored and skipped.

func CopyFile 

func CopyFile(src, dst string, option ...CopyOption) (err error)

CopyFile copies the contents of the file named `src` to the file named by `dst`. The file will be created if it does not exist. If the destination file exists, all it's contents will be replaced by the contents of the source file. The file mode will be copied from the source and the copied data is synced/flushed to stable storage. Thanks: https://gist.github.com/r0l1/92462b38df26839a3ca324697c8cba04

func Create 

func Create(path string) (*os.File, error)

Create creates a file with given `path` recursively. The parameter `path` is suggested to be absolute path.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		path     = gfile.Join(gfile.Temp("gfile_example_basic_dir"), "file1")
		dataByte = make([]byte, 50)
	)
	// Check whether the file exists
	isFile := gfile.IsFile(path)

	fmt.Println(isFile)

	// Creates file with given `path` recursively
	fileHandle, _ := gfile.Create(path)
	defer fileHandle.Close()

	// Write some content to file
	n, _ := fileHandle.WriteString("hello goframe")

	// Check whether the file exists
	isFile = gfile.IsFile(path)

	fmt.Println(isFile)

	// Reads len(b) bytes from the File
	fileHandle.ReadAt(dataByte, 0)

	fmt.Println(string(dataByte[:n]))

}

Output:

false
true
hello goframe

func Dir 

func Dir(path string) string

Dir returns all but the last element of path, typically the path's directory. After dropping the final element, Dir calls Clean on the path and trailing slashes are removed. If the `path` is empty, Dir returns ".". If the `path` is ".", Dir treats the path as current working directory. If the `path` consists entirely of separators, Dir returns a single separator. The returned path does not end in a separator unless it is the root directory.

Example: Dir("/var/www/file.js") -> "/var/www" Dir("file.js") -> "."

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		path = gfile.Join(gfile.Temp("gfile_example_basic_dir"), "file1")
	)

	// Get all but the last element of path, typically the path's directory.
	fmt.Println(gfile.Dir(path))

	// May Output:
	// /tmp/gfile_example_basic_dir
}

Output:

func DirNames 

func DirNames(path string) ([]string, error)

DirNames returns sub-file names of given directory `path`. Note that the returned names are NOT absolute paths.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		path = gfile.Temp("gfile_example_basic_dir")
	)
	// Get sub-file names of given directory `path`.
	dirNames, _ := gfile.DirNames(path)

	fmt.Println(dirNames)

	// May Output:
	// [file1]
}

Output:

func Exists 

func Exists(path string) bool

Exists checks whether given `path` exist.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		path = gfile.Join(gfile.Temp("gfile_example_basic_dir"), "file1")
	)
	// Checks whether given `path` exist.
	joinString := gfile.Exists(path)

	fmt.Println(joinString)

}

Output:

true

func Ext 

func Ext(path string) string

Ext returns the file name extension used by path. The extension is the suffix beginning at the final dot in the final element of path; it is empty if there is no dot. Note: the result contains symbol '.'.

Example: Ext("main.go") => .go Ext("api.json") => .json

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		path = gfile.Pwd() + gfile.Separator + "testdata/readline/file.log"
	)

	// Get the file name extension used by path.
	fmt.Println(gfile.Ext(path))

}

Output:

.log

func ExtName 

func ExtName(path string) string

ExtName is like function Ext, which returns the file name extension used by path, but the result does not contain symbol '.'.

Example: ExtName("main.go") => go ExtName("api.json") => json

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		path = gfile.Pwd() + gfile.Separator + "testdata/readline/file.log"
	)

	// Get the file name extension used by path but the result does not contains symbol '.'.
	fmt.Println(gfile.ExtName(path))

}

Output:

log

func FormatSize 

func FormatSize(raw int64) string

FormatSize formats size `raw` for more manually readable.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	sizeStr := gfile.FormatSize(104857600)
	fmt.Println(sizeStr)
	sizeStr0 := gfile.FormatSize(1024)
	fmt.Println(sizeStr0)
	sizeStr1 := gfile.FormatSize(999999999999999999)
	fmt.Println(sizeStr1)

}

Output:

100.00M
1.00K
888.18P

func GetBytes 

func GetBytes(path string) []byte

GetBytes returns the file content of `path` as []byte. It returns nil if it fails reading.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		fileName = "gfile_example.txt"
		tempDir  = gfile.Temp("gfile_example_content")
		tempFile = gfile.Join(tempDir, fileName)
	)

	// write contents
	gfile.PutContents(tempFile, "goframe example content")

	// It reads and returns the file content as []byte.
	// It returns nil if it fails reading, for example, with permission or IO error.
	fmt.Println(gfile.GetBytes(tempFile))

}

Output:

[103 111 102 114 97 109 101 32 101 120 97 109 112 108 101 32 99 111 110 116 101 110 116]

func GetBytesByTwoOffsets 

func GetBytesByTwoOffsets(reader io.ReaderAt, start int64, end int64) []byte

GetBytesByTwoOffsets returns the binary content as []byte from `start` to `end`. Note: Returned value does not contain the character of the last position, which means it returns content range as [start, end).

func GetBytesByTwoOffsetsByPath 

func GetBytesByTwoOffsetsByPath(path string, start int64, end int64) []byte

GetBytesByTwoOffsetsByPath returns the binary content as []byte from `start` to `end`. Note: Returned value does not contain the character of the last position, which means it returns content range as [start, end). It opens file of `path` for reading with os.O_RDONLY flag and default perm.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		fileName = "gfile_example.txt"
		tempDir  = gfile.Temp("gfile_example_content")
		tempFile = gfile.Join(tempDir, fileName)
	)

	// write contents
	gfile.PutContents(tempFile, "goframe example content")

	// read contents
	fmt.Println(gfile.GetBytesByTwoOffsetsByPath(tempFile, 0, 7))

}

Output:

[103 111 102 114 97 109 101]

func GetBytesTilChar 

func GetBytesTilChar(reader io.ReaderAt, char byte, start int64) ([]byte, int64)

GetBytesTilChar returns the contents of the file as []byte until the next specified byte `char` position.

Note: Returned value contains the character of the last position.

func GetBytesTilCharByPath 

func GetBytesTilCharByPath(path string, char byte, start int64) ([]byte, int64)

GetBytesTilCharByPath returns the contents of the file given by `path` as []byte until the next specified byte `char` position. It opens file of `path` for reading with os.O_RDONLY flag and default perm.

Note: Returned value contains the character of the last position.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		fileName = "gfile_example.txt"
		tempDir  = gfile.Temp("gfile_example_content")
		tempFile = gfile.Join(tempDir, fileName)
	)

	// write contents
	gfile.PutContents(tempFile, "goframe example content")

	// read contents
	fmt.Println(gfile.GetBytesTilCharByPath(tempFile, 'f', 0))

}

Output:

[103 111 102] 2

func GetContents 

func GetContents(path string) string

GetContents returns the file content of `path` as string. It returns en empty string if it fails reading.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		fileName = "gfile_example.txt"
		tempDir  = gfile.Temp("gfile_example_content")
		tempFile = gfile.Join(tempDir, fileName)
	)

	// write contents
	gfile.PutContents(tempFile, "goframe example content")

	// It reads and returns the file content as string.
	// It returns empty string if it fails reading, for example, with permission or IO error.
	fmt.Println(gfile.GetContents(tempFile))

}

Output:

goframe example content

func GetNextCharOffset 

func GetNextCharOffset(reader io.ReaderAt, char byte, start int64) int64

GetNextCharOffset returns the file offset for given `char` starting from `start`.

func GetNextCharOffsetByPath 

func GetNextCharOffsetByPath(path string, char byte, start int64) int64

GetNextCharOffsetByPath returns the file offset for given `char` starting from `start`. It opens file of `path` for reading with os.O_RDONLY flag and default perm.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		fileName = "gfile_example.txt"
		tempDir  = gfile.Temp("gfile_example_content")
		tempFile = gfile.Join(tempDir, fileName)
	)

	// write contents
	gfile.PutContents(tempFile, "goframe example content")

	// read contents
	index := gfile.GetNextCharOffsetByPath(tempFile, 'f', 0)
	fmt.Println(index)

}

Output:

2

func Glob 

func Glob(pattern string, onlyNames ...bool) ([]string, error)

Glob returns the names of all files matching pattern or nil if there is no matching file. The syntax of patterns is the same as in Match. The pattern may describe hierarchical names such as /usr/*/bin/ed (assuming the Separator is '/').

Glob ignores file system errors such as I/O errors reading directories. The only possible returned error is ErrBadPattern, when pattern is malformed.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		path = gfile.Pwd() + gfile.Separator + "*_example_basic_test.go"
	)
	// Get sub-file names of given directory `path`.
	// Only show file name
	matchNames, _ := gfile.Glob(path, true)

	fmt.Println(matchNames)

	// Show full path of the file
	matchNames, _ = gfile.Glob(path, false)

	fmt.Println(matchNames)

	// May Output:
	// [gfile_z_example_basic_test.go]
	// [xxx/gf/os/gfile/gfile_z_example_basic_test.go]
}

Output:

func Home 

func Home(names ...string) (string, error)

Home returns absolute path of current user's home directory. The optional parameter `names` specifies the sub-folders/sub-files, which will be joined with current system separator and returned with the path.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// user's home directory
	homePath, _ := gfile.Home()
	fmt.Println(homePath)

	// May Output:
	// C:\Users\hailaz
}

Output:

func IsDir 

func IsDir(path string) bool

IsDir checks whether given `path` a directory. Note that it returns false if the `path` does not exist.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		path     = gfile.Temp("gfile_example_basic_dir")
		filePath = gfile.Join(gfile.Temp("gfile_example_basic_dir"), "file1")
	)
	// Checks whether given `path` a directory.
	fmt.Println(gfile.IsDir(path))
	fmt.Println(gfile.IsDir(filePath))

}

Output:

true
false

func IsEmpty 

func IsEmpty(path string) bool

IsEmpty checks whether the given `path` is empty. If `path` is a folder, it checks if there's any file under it. If `path` is a file, it checks if the file size is zero.

Note that it returns true if `path` does not exist.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		path = gfile.Join(gfile.Temp("gfile_example_basic_dir"), "file1")
	)

	// Check whether the `path` is empty
	fmt.Println(gfile.IsEmpty(path))

	// Truncate file
	gfile.Truncate(path, 0)

	// Check whether the `path` is empty
	fmt.Println(gfile.IsEmpty(path))

}

Output:

false
true

func IsFile 

func IsFile(path string) bool

IsFile checks whether given `path` a file, which means it's not a directory. Note that it returns false if the `path` does not exist.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		filePath = gfile.Join(gfile.Temp("gfile_example_basic_dir"), "file1")
		dirPath  = gfile.Temp("gfile_example_basic_dir")
	)
	// Checks whether given `path` a file, which means it's not a directory.
	fmt.Println(gfile.IsFile(filePath))
	fmt.Println(gfile.IsFile(dirPath))

}

Output:

true
false

func IsReadable 

func IsReadable(path string) bool

IsReadable checks whether given `path` is readable.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		path = gfile.Pwd() + gfile.Separator + "testdata/readline/file.log"
	)

	// Checks whether given `path` is readable.
	fmt.Println(gfile.IsReadable(path))

}

Output:

true

func IsWritable 

func IsWritable(path string) bool

IsWritable checks whether given `path` is writable.

TODO improve performance; use golang.org/x/sys to cross-plat-form

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		path = gfile.Pwd() + gfile.Separator + "testdata/readline/"
		file = "file.log"
	)

	// Checks whether given `path` is writable.
	fmt.Println(gfile.IsWritable(path))
	fmt.Println(gfile.IsWritable(path + file))

}

Output:

true
true

func Join 

func Join(paths ...string) string

Join joins string array paths with file separator of current system.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		dirPath  = gfile.Temp("gfile_example_basic_dir")
		filePath = "file1"
	)

	// Joins string array paths with file separator of current system.
	joinString := gfile.Join(dirPath, filePath)

	fmt.Println(joinString)

	// May Output:
	// /tmp/gfile_example_basic_dir/file1
}

Output:

func MTime 

func MTime(path string) time.Time

MTime returns the modification time of file given by `path` in second.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	t := gfile.MTime(gfile.Temp())
	fmt.Println(t)

	// May Output:
	// 2021-11-02 15:18:43.901141 +0800 CST
}

Output:

func MTimestamp 

func MTimestamp(path string) int64

MTimestamp returns the modification time of file given by `path` in second.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	t := gfile.MTimestamp(gfile.Temp())
	fmt.Println(t)

	// May Output:
	// 1635838398
}

Output:

func MTimestampMilli 

func MTimestampMilli(path string) int64

MTimestampMilli returns the modification time of file given by `path` in millisecond.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	t := gfile.MTimestampMilli(gfile.Temp())
	fmt.Println(t)

	// May Output:
	// 1635838529330
}

Output:

func MainPkgPath 

func MainPkgPath() string

MainPkgPath returns absolute file path of package main, which contains the entrance function main.

It's only available in develop environment.

Note1: Only valid for source development environments, IE only valid for systems that generate this executable.

Note2: When the method is called for the first time, if it is in an asynchronous goroutine, the method may not get the main package path.

func Mkdir 

func Mkdir(path string) (err error)

Mkdir creates directories recursively with given `path`. The parameter `path` is suggested to be an absolute path instead of relative one.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		path = gfile.Temp("gfile_example_basic_dir")
	)

	// Creates directory
	gfile.Mkdir(path)

	// Check if directory exists
	fmt.Println(gfile.IsDir(path))

}

Output:

true

func Move 

func Move(src string, dst string) (err error)

Move renames (moves) `src` to `dst` path. If `dst` already exists and is not a directory, it'll be replaced.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		srcPath = gfile.Join(gfile.Temp("gfile_example_basic_dir"), "file1")
		dstPath = gfile.Join(gfile.Temp("gfile_example_basic_dir"), "file2")
	)
	// Check is file
	fmt.Println(gfile.IsFile(dstPath))

	//  Moves `src` to `dst` path.
	// If `dst` already exists and is not a directory, it'll be replaced.
	gfile.Move(srcPath, dstPath)

	fmt.Println(gfile.IsFile(srcPath))
	fmt.Println(gfile.IsFile(dstPath))

}

Output:

false
false
true

func Name 

func Name(path string) string

Name returns the last element of path without file extension.

Example: Name("/var/www/file.js") -> file Name("file.js") -> file

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		path = gfile.Pwd() + gfile.Separator + "testdata/readline/file.log"
	)

	// Get the last element of path without file extension.
	fmt.Println(gfile.Name(path))

}

Output:

file

func Open 

func Open(path string) (*os.File, error)

Open opens file/directory READONLY.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		path     = gfile.Join(gfile.Temp("gfile_example_basic_dir"), "file1")
		dataByte = make([]byte, 4096)
	)
	// Open file or directory with READONLY model
	file, _ := gfile.Open(path)
	defer file.Close()

	// Read data
	n, _ := file.Read(dataByte)

	fmt.Println(string(dataByte[:n]))

}

Output:

hello goframe

func OpenFile 

func OpenFile(path string, flag int, perm os.FileMode) (*os.File, error)

OpenFile opens file/directory with custom `flag` and `perm`. The parameter `flag` is like: O_RDONLY, O_RDWR, O_RDWR|O_CREATE|O_TRUNC, etc.

Example 
package main

import (
	"fmt"
	"os"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		path     = gfile.Join(gfile.Temp("gfile_example_basic_dir"), "file1")
		dataByte = make([]byte, 4096)
	)
	// Opens file/directory with custom `flag` and `perm`
	// Create if file does not exist,it is created in a readable and writable mode,prem 0777
	openFile, _ := gfile.OpenFile(path, os.O_CREATE|os.O_RDWR, gfile.DefaultPermCopy)
	defer openFile.Close()

	// Write some content to file
	writeLength, _ := openFile.WriteString("hello goframe test open file")

	fmt.Println(writeLength)

	// Read data
	n, _ := openFile.ReadAt(dataByte, 0)

	fmt.Println(string(dataByte[:n]))

}

Output:

28
hello goframe test open file

func OpenWithFlag 

func OpenWithFlag(path string, flag int) (*os.File, error)

OpenWithFlag opens file/directory with default perm and custom `flag`. The default `perm` is 0666. The parameter `flag` is like: O_RDONLY, O_RDWR, O_RDWR|O_CREATE|O_TRUNC, etc.

Example 
package main

import (
	"fmt"
	"os"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		path     = gfile.Join(gfile.Temp("gfile_example_basic_dir"), "file1")
		dataByte = make([]byte, 4096)
	)

	// Opens file/directory with custom `flag`
	// Create if file does not exist,it is created in a readable and writable mode with default `perm` is 0666
	openFile, _ := gfile.OpenWithFlag(path, os.O_CREATE|os.O_RDWR)
	defer openFile.Close()

	// Write some content to file
	writeLength, _ := openFile.WriteString("hello goframe test open file with flag")

	fmt.Println(writeLength)

	// Read data
	n, _ := openFile.ReadAt(dataByte, 0)

	fmt.Println(string(dataByte[:n]))

}

Output:

38
hello goframe test open file with flag

func OpenWithFlagPerm 

func OpenWithFlagPerm(path string, flag int, perm os.FileMode) (*os.File, error)

OpenWithFlagPerm opens file/directory with custom `flag` and `perm`. The parameter `flag` is like: O_RDONLY, O_RDWR, O_RDWR|O_CREATE|O_TRUNC, etc. The parameter `perm` is like: 0600, 0666, 0777, etc.

func PutBytes 

func PutBytes(path string, content []byte) error

PutBytes puts binary `content` to file of `path`. It creates file of `path` recursively if it does not exist.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		fileName = "gfile_example.txt"
		tempDir  = gfile.Temp("gfile_example_content")
		tempFile = gfile.Join(tempDir, fileName)
	)

	// write contents
	gfile.PutBytes(tempFile, []byte("goframe example content"))

	// read contents
	fmt.Println(gfile.GetContents(tempFile))

}

Output:

goframe example content

func PutBytesAppend 

func PutBytesAppend(path string, content []byte) error

PutBytesAppend appends binary `content` to file of `path`. It creates file of `path` recursively if it does not exist.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		fileName = "gfile_example.txt"
		tempDir  = gfile.Temp("gfile_example_content")
		tempFile = gfile.Join(tempDir, fileName)
	)

	// write contents
	gfile.PutContents(tempFile, "goframe example content")

	// read contents
	fmt.Println(gfile.GetContents(tempFile))

	// write contents
	gfile.PutBytesAppend(tempFile, []byte(" append"))

	// read contents
	fmt.Println(gfile.GetContents(tempFile))

}

Output:

goframe example content
goframe example content append

func PutContents 

func PutContents(path string, content string) error

PutContents puts string `content` to file of `path`. It creates file of `path` recursively if it does not exist.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		fileName = "gfile_example.txt"
		tempDir  = gfile.Temp("gfile_example_content")
		tempFile = gfile.Join(tempDir, fileName)
	)

	// It creates and puts content string into specifies file path.
	// It automatically creates directory recursively if it does not exist.
	gfile.PutContents(tempFile, "goframe example content")

	// read contents
	fmt.Println(gfile.GetContents(tempFile))

}

Output:

goframe example content

func PutContentsAppend 

func PutContentsAppend(path string, content string) error

PutContentsAppend appends string `content` to file of `path`. It creates file of `path` recursively if it does not exist.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		fileName = "gfile_example.txt"
		tempDir  = gfile.Temp("gfile_example_content")
		tempFile = gfile.Join(tempDir, fileName)
	)

	// write contents
	gfile.PutContents(tempFile, "goframe example content")

	// read contents
	fmt.Println(gfile.GetContents(tempFile))

	// It creates and append content string into specifies file path.
	// It automatically creates directory recursively if it does not exist.
	gfile.PutContentsAppend(tempFile, " append content")

	// read contents
	fmt.Println(gfile.GetContents(tempFile))

}

Output:

goframe example content
goframe example content append content

func Pwd 

func Pwd() string

Pwd returns absolute path of current working directory. Note that it returns an empty string if retrieving current working directory failed.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// Get absolute path of current working directory.
	fmt.Println(gfile.Pwd())

	// May Output:
	// xxx/gf/os/gfile
}

Output:

func ReadLines 

func ReadLines(file string, callback func(line string) error) error

ReadLines reads file content line by line, which is passed to the callback function `callback` as string. It matches each line of text, separated by chars '\r' or '\n', stripped any trailing end-of-line marker.

Note that the parameter passed to callback function might be an empty value, and the last non-empty line will be passed to callback function `callback` even if it has no newline marker.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		fileName = "gfile_example.txt"
		tempDir  = gfile.Temp("gfile_example_content")
		tempFile = gfile.Join(tempDir, fileName)
	)

	// write contents
	gfile.PutContents(tempFile, "L1 goframe example content\nL2 goframe example content")

	// read contents
	gfile.ReadLines(tempFile, func(text string) error {
		// Process each line
		fmt.Println(text)
		return nil
	})

}

Output:

L1 goframe example content
L2 goframe example content

func ReadLinesBytes 

func ReadLinesBytes(file string, callback func(bytes []byte) error) error

ReadLinesBytes reads file content line by line, which is passed to the callback function `callback` as []byte. It matches each line of text, separated by chars '\r' or '\n', stripped any trailing end-of-line marker.

Note that the parameter passed to callback function might be an empty value, and the last non-empty line will be passed to callback function `callback` even if it has no newline marker.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		fileName = "gfile_example.txt"
		tempDir  = gfile.Temp("gfile_example_content")
		tempFile = gfile.Join(tempDir, fileName)
	)

	// write contents
	gfile.PutContents(tempFile, "L1 goframe example content\nL2 goframe example content")

	// read contents
	gfile.ReadLinesBytes(tempFile, func(bytes []byte) error {
		// Process each line
		fmt.Println(bytes)
		return nil
	})

}

Output:

[76 49 32 103 111 102 114 97 109 101 32 101 120 97 109 112 108 101 32 99 111 110 116 101 110 116]
[76 50 32 103 111 102 114 97 109 101 32 101 120 97 109 112 108 101 32 99 111 110 116 101 110 116]

func ReadableSize 

func ReadableSize(path string) string

ReadableSize formats size of file given by `path`, for more human readable.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		fileName = "gfile_example.txt"
		tempDir  = gfile.Temp("gfile_example_size")
		tempFile = gfile.Join(tempDir, fileName)
	)

	// write contents
	gfile.PutContents(tempFile, "01234567899876543210")
	fmt.Println(gfile.ReadableSize(tempFile))

}

Output:

20.00B

func RealPath 

func RealPath(path string) string

RealPath converts the given `path` to its absolute path and checks if the file path exists. If the file does not exist, return an empty string.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		realPath  = gfile.Join(gfile.Temp("gfile_example_basic_dir"), "file1")
		worryPath = gfile.Join(gfile.Temp("gfile_example_basic_dir"), "worryFile")
	)

	// fetch an absolute representation of path.
	fmt.Println(gfile.RealPath(realPath))
	fmt.Println(gfile.RealPath(worryPath))

	// May Output:
	// /tmp/gfile_example_basic_dir/file1
}

Output:

func Remove 

func Remove(path string) (err error)

Remove deletes all file/directory with `path` parameter. If parameter `path` is directory, it deletes it recursively.

It does nothing if given `path` does not exist or is empty.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		path = gfile.Join(gfile.Temp("gfile_example_basic_dir"), "file1")
	)

	// Checks whether given `path` a file, which means it's not a directory.
	fmt.Println(gfile.IsFile(path))

	// deletes all file/directory with `path` parameter.
	gfile.Remove(path)

	// Check again
	fmt.Println(gfile.IsFile(path))

}

Output:

true
false

func Rename 

func Rename(src string, dst string) error

Rename is alias of Move. See Move.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		srcPath = gfile.Join(gfile.Temp("gfile_example_basic_dir"), "file2")
		dstPath = gfile.Join(gfile.Temp("gfile_example_basic_dir"), "file1")
	)
	// Check is file
	fmt.Println(gfile.IsFile(dstPath))

	//  renames (moves) `src` to `dst` path.
	// If `dst` already exists and is not a directory, it'll be replaced.
	gfile.Rename(srcPath, dstPath)

	fmt.Println(gfile.IsFile(srcPath))
	fmt.Println(gfile.IsFile(dstPath))

}

Output:

false
false
true

func ReplaceDir 

func ReplaceDir(search, replace, path, pattern string, recursive ...bool) error

ReplaceDir replaces content for files under `path`. The parameter `pattern` specifies the file pattern which matches to be replaced. It does replacement recursively if given parameter `recursive` is true.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		fileName = "gfile_example.txt"
		tempDir  = gfile.Temp("gfile_example_replace")
		tempFile = gfile.Join(tempDir, fileName)
	)

	// write contents
	gfile.PutContents(tempFile, "goframe example content")

	// read contents
	fmt.Println(gfile.GetContents(tempFile))

	// It replaces content of all files under specified directory recursively.
	gfile.ReplaceDir("content", "replace word", tempDir, "gfile_example.txt", true)

	// read contents
	fmt.Println(gfile.GetContents(tempFile))

}

Output:

goframe example content
goframe example replace word

func ReplaceDirFunc 

func ReplaceDirFunc(f func(path, content string) string, path, pattern string, recursive ...bool) error

ReplaceDirFunc replaces content for files under `path` with callback function `f`. The parameter `pattern` specifies the file pattern which matches to be replaced. It does replacement recursively if given parameter `recursive` is true.

Example 
package main

import (
	"fmt"
	"regexp"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		fileName = "gfile_example.txt"
		tempDir  = gfile.Temp("gfile_example_replace")
		tempFile = gfile.Join(tempDir, fileName)
	)

	// write contents
	gfile.PutContents(tempFile, "goframe example 123")

	// read contents
	fmt.Println(gfile.GetContents(tempFile))

	// It replaces content of all files under specified directory with custom callback function recursively.
	gfile.ReplaceDirFunc(func(path, content string) string {
		// Replace with regular match
		reg, _ := regexp.Compile(`\d{3}`)
		return reg.ReplaceAllString(content, "[num]")
	}, tempDir, "gfile_example.txt", true)

	fmt.Println(gfile.GetContents(tempFile))

}

Output:

goframe example 123
goframe example [num]

func ReplaceFile 

func ReplaceFile(search, replace, path string) error

ReplaceFile replaces content for file `path`.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		fileName = "gfile_example.txt"
		tempDir  = gfile.Temp("gfile_example_replace")
		tempFile = gfile.Join(tempDir, fileName)
	)

	// write contents
	gfile.PutContents(tempFile, "goframe example content")

	// read contents
	fmt.Println(gfile.GetContents(tempFile))

	// It replaces content directly by file path.
	gfile.ReplaceFile("content", "replace word", tempFile)

	fmt.Println(gfile.GetContents(tempFile))

}

Output:

goframe example content
goframe example replace word

func ReplaceFileFunc 

func ReplaceFileFunc(f func(path, content string) string, path string) error

ReplaceFileFunc replaces content for file `path` with callback function `f`.

Example 
package main

import (
	"fmt"
	"regexp"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		fileName = "gfile_example.txt"
		tempDir  = gfile.Temp("gfile_example_replace")
		tempFile = gfile.Join(tempDir, fileName)
	)

	// write contents
	gfile.PutContents(tempFile, "goframe example 123")

	// read contents
	fmt.Println(gfile.GetContents(tempFile))

	// It replaces content directly by file path and callback function.
	gfile.ReplaceFileFunc(func(path, content string) string {
		// Replace with regular match
		reg, _ := regexp.Compile(`\d{3}`)
		return reg.ReplaceAllString(content, "[num]")
	}, tempFile)

	fmt.Println(gfile.GetContents(tempFile))

}

Output:

goframe example 123
goframe example [num]

func ScanDir 

func ScanDir(path string, pattern string, recursive ...bool) ([]string, error)

ScanDir returns all sub-files with absolute paths of given `path`, It scans directory recursively if given parameter `recursive` is true.

The pattern parameter `pattern` supports multiple file name patterns, using the ',' symbol to separate multiple patterns.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		fileName = "gfile_example.txt"
		tempDir  = gfile.Temp("gfile_example_scan_dir")
		tempFile = gfile.Join(tempDir, fileName)

		tempSubDir  = gfile.Join(tempDir, "sub_dir")
		tempSubFile = gfile.Join(tempSubDir, fileName)
	)

	// write contents
	gfile.PutContents(tempFile, "goframe example content")
	gfile.PutContents(tempSubFile, "goframe example content")

	// scans directory recursively
	list, _ := gfile.ScanDir(tempDir, "*", true)
	for _, v := range list {
		fmt.Println(gfile.Basename(v))
	}

}

Output:

gfile_example.txt
sub_dir
gfile_example.txt

func ScanDirFile 

func ScanDirFile(path string, pattern string, recursive ...bool) ([]string, error)

ScanDirFile returns all sub-files with absolute paths of given `path`, It scans directory recursively if given parameter `recursive` is true.

The pattern parameter `pattern` supports multiple file name patterns, using the ',' symbol to separate multiple patterns.

Note that it returns only files, exclusive of directories.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		fileName = "gfile_example.txt"
		tempDir  = gfile.Temp("gfile_example_scan_dir_file")
		tempFile = gfile.Join(tempDir, fileName)

		tempSubDir  = gfile.Join(tempDir, "sub_dir")
		tempSubFile = gfile.Join(tempSubDir, fileName)
	)

	// write contents
	gfile.PutContents(tempFile, "goframe example content")
	gfile.PutContents(tempSubFile, "goframe example content")

	// scans directory recursively exclusive of directories
	list, _ := gfile.ScanDirFile(tempDir, "*.txt", true)
	for _, v := range list {
		fmt.Println(gfile.Basename(v))
	}

}

Output:

gfile_example.txt
gfile_example.txt

func ScanDirFileFunc 

func ScanDirFileFunc(path string, pattern string, recursive bool, handler func(path string) string) ([]string, error)

ScanDirFileFunc returns all sub-files with absolute paths of given `path`, It scans directory recursively if given parameter `recursive` is true.

The pattern parameter `pattern` supports multiple file name patterns, using the ',' symbol to separate multiple patterns.

The parameter `recursive` specifies whether scanning the `path` recursively, which means it scans its sub-files and appends the file paths to result array if the sub-file is also a folder. It is false in default.

The parameter `handler` specifies the callback function handling each sub-file path of the `path` and its sub-folders. It ignores the sub-file path if `handler` returns an empty string, or else it appends the sub-file path to result slice.

Note that the parameter `path` for `handler` is not a directory but a file. It returns only files, exclusive of directories.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		fileName = "gfile_example.txt"
		tempDir  = gfile.Temp("gfile_example_scan_dir_file_func")
		tempFile = gfile.Join(tempDir, fileName)

		fileName1 = "gfile_example_ignores.txt"
		tempFile1 = gfile.Join(tempDir, fileName1)

		tempSubDir  = gfile.Join(tempDir, "sub_dir")
		tempSubFile = gfile.Join(tempSubDir, fileName)
	)

	// write contents
	gfile.PutContents(tempFile, "goframe example content")
	gfile.PutContents(tempFile1, "goframe example content")
	gfile.PutContents(tempSubFile, "goframe example content")

	// scans directory recursively exclusive of directories
	list, _ := gfile.ScanDirFileFunc(tempDir, "*.txt", true, func(path string) string {
		// ignores some files
		if gfile.Basename(path) == "gfile_example_ignores.txt" {
			return ""
		}
		return path
	})
	for _, v := range list {
		fmt.Println(gfile.Basename(v))
	}

}

Output:

gfile_example.txt
gfile_example.txt

func ScanDirFunc 

func ScanDirFunc(path string, pattern string, recursive bool, handler func(path string) string) ([]string, error)

ScanDirFunc returns all sub-files with absolute paths of given `path`, It scans directory recursively if given parameter `recursive` is true.

The pattern parameter `pattern` supports multiple file name patterns, using the ',' symbol to separate multiple patterns.

The parameter `recursive` specifies whether scanning the `path` recursively, which means it scans its sub-files and appends the files path to result array if the sub-file is also a folder. It is false in default.

The parameter `handler` specifies the callback function handling each sub-file path of the `path` and its sub-folders. It ignores the sub-file path if `handler` returns an empty string, or else it appends the sub-file path to result slice.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		fileName = "gfile_example.txt"
		tempDir  = gfile.Temp("gfile_example_scan_dir_func")
		tempFile = gfile.Join(tempDir, fileName)

		tempSubDir  = gfile.Join(tempDir, "sub_dir")
		tempSubFile = gfile.Join(tempSubDir, fileName)
	)

	// write contents
	gfile.PutContents(tempFile, "goframe example content")
	gfile.PutContents(tempSubFile, "goframe example content")

	// scans directory recursively
	list, _ := gfile.ScanDirFunc(tempDir, "*", true, func(path string) string {
		// ignores some files
		if gfile.Basename(path) == "gfile_example.txt" {
			return ""
		}
		return path
	})
	for _, v := range list {
		fmt.Println(gfile.Basename(v))
	}

}

Output:

sub_dir

func Search(name string, prioritySearchPaths ...string) (realPath string, err error)

Search searches file by name `name` in following paths with priority: prioritySearchPaths, Pwd()、SelfDir()、MainPkgPath(). It returns the absolute file path of `name` if found, or en empty string if not found.

func SelfDir 

func SelfDir() string

SelfDir returns absolute directory path of current running process(binary).

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {

	// Get absolute directory path of current running process
	fmt.Println(gfile.SelfDir())

	// May Output:
	// /private/var/folders/p6/gc_9mm3j229c0mjrjp01gqn80000gn/T
}

Output:

func SelfName 

func SelfName() string

SelfName returns file name of current running process(binary).

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {

	// Get file name of current running process
	fmt.Println(gfile.SelfName())

	// May Output:
	// ___github_com_gogf_gf_v2_os_gfile__ExampleSelfName
}

Output:

func SelfPath 

func SelfPath() string

SelfPath returns absolute file path of current running process(binary).

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {

	// Get absolute file path of current running process
	fmt.Println(gfile.SelfPath())

	// May Output:
	// xxx/___github_com_gogf_gf_v2_os_gfile__ExampleSelfPath
}

Output:

func Size 

func Size(path string) int64

Size returns the size of file specified by `path` in byte.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		fileName = "gfile_example.txt"
		tempDir  = gfile.Temp("gfile_example_size")
		tempFile = gfile.Join(tempDir, fileName)
	)

	// write contents
	gfile.PutContents(tempFile, "0123456789")
	fmt.Println(gfile.Size(tempFile))

}

Output:

10

func SizeFormat 

func SizeFormat(path string) string

SizeFormat returns the size of file specified by `path` in format string.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		fileName = "gfile_example.txt"
		tempDir  = gfile.Temp("gfile_example_size")
		tempFile = gfile.Join(tempDir, fileName)
	)

	// write contents
	gfile.PutContents(tempFile, "0123456789")
	fmt.Println(gfile.SizeFormat(tempFile))

}

Output:

10.00B

func SortFiles 

func SortFiles(files []string) []string

SortFiles sorts the `files` in order of: directory -> file. Note that the item of `files` should be absolute path.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	files := []string{
		"/aaa/bbb/ccc.txt",
		"/aaa/bbb/",
		"/aaa/",
		"/aaa",
		"/aaa/ccc/ddd.txt",
		"/bbb",
		"/0123",
		"/ddd",
		"/ccc",
	}
	sortOut := gfile.SortFiles(files)
	fmt.Println(sortOut)

}

Output:

[/0123 /aaa /aaa/ /aaa/bbb/ /aaa/bbb/ccc.txt /aaa/ccc/ddd.txt /bbb /ccc /ddd]

func Stat 

func Stat(path string) (os.FileInfo, error)

Stat returns a FileInfo describing the named file. If there is an error, it will be of type *PathError.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	// init
	var (
		path = gfile.Join(gfile.Temp("gfile_example_basic_dir"), "file1")
	)
	// Get a FileInfo describing the named file.
	stat, _ := gfile.Stat(path)

	fmt.Println(stat.Name())
	fmt.Println(stat.IsDir())
	fmt.Println(stat.Mode())
	fmt.Println(stat.ModTime())
	fmt.Println(stat.Size())
	fmt.Println(stat.Sys())

	// May Output:
	// file1
	// false
	// -rwxr-xr-x
	// 2021-12-02 11:01:27.261441694 +0800 CST
	// &{16777220 33261 1 8597857090 501 20 0 [0 0 0 0] {1638414088 192363490} {1638414087 261441694} {1638414087 261441694} {1638413480 485068275} 38 8 4096 0 0 0 [0 0]}
}

Output:

func StrToSize 

func StrToSize(sizeStr string) int64

StrToSize converts formatted size string to its size in bytes.

Example 
package main

import (
	"fmt"

	"gitee.com/iceinto/gfutil/v2/os/gfile"
)

func main() {
	size := gfile.StrToSize("100MB")
	fmt.Println(size)

}

Output:

104857600

func Temp 

func Temp(names ...string) string

Temp retrieves and returns the temporary directory of current system.

The optional parameter `names` specifies the sub-folders/sub-files, which will be joined with current system separator and returned with the path.

func Truncate 

func Truncate(path string, size int) (err error)

Truncate truncates file of `path` to given size by `size`.

Types

type CopyOption 

type CopyOption struct {
	// Auto call file sync after source file content copied to target file.
	Sync bool

	// Preserve the mode of the original file to the target file.
	// If true, the Mode attribute will make no sense.
	PreserveMode bool

	// Destination created file mode.
	// The default file mode is DefaultPermCopy if PreserveMode is false.
	Mode os.FileMode
}

CopyOption is the option for Copy* functions.

Source Files

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