Merge pull request #13 from jarxorg/some-codes-moves-to-fs2

Some code moves to fs2 package

README.md

@@ -4,46 +4,9 @@
 [![Report Card](https://goreportcard.com/badge/github.com/jarxorg/io2)](https://goreportcard.com/report/github.com/jarxorg/io2)
 [![Coverage Status](https://coveralls.io/repos/github/jarxorg/io2/badge.svg?branch=main)](https://coveralls.io/github/jarxorg/io2?branch=main)
 
-Go "io" and "io/fs" package utilities.
+Go "io" package utilities.
 
-## Writable io/fs.FS implementations
-
-- [osfs](https://github.com/jarxorg/io2/tree/main/osfs)
-- [memfs](https://github.com/jarxorg/io2/tree/main/memfs)
-- [s3fs](https://github.com/jarxorg/s3fs)
-
-```go
-package main
-
-import (
-  "fmt"
-  "io/fs"
-  "log"
-
-  "github.com/jarxorg/io2"
-  "github.com/jarxorg/io2/memfs"
-  "github.com/jarxorg/io2/osfs"
-)
-
-func main() {
-  osFsys := osfs.DirFS(".")
-  memFsys := memfs.New()
-
-  err := io2.CopyFS(memFsys, osFsys, "osfs/testdata")
-  if err != nil {
-    log.Fatal(err)
-  }
-
-  names, err := fs.Glob(memFsys, "osfs/testdata/dir0/*.txt")
-  if err != nil {
-    log.Fatal(err)
-  }
-
-  fmt.Printf("%v\n", names)
-
-  // Output: [osfs/testdata/dir0/file01.txt osfs/testdata/dir0/file02.txt]
-}
-```
+NOTE: some codes moves to [fs2](https://github.com/jarxorg/fs2).
 
 ## Delegator
 
@@ -81,6 +44,12 @@ func main() {
 ### No-op Closer using Delegator
 
 ```go
+// NopReadCloser returns a ReadCloser with a no-op Close method wrapping the provided interface.
+// This function like io.NopCloser(io.Reader).
+func NopReadCloser(r io.Reader) io.ReadCloser {
+	return DelegateReader(r)
+}
+
 // NopReadWriteCloser returns a ReadWriteCloser with a no-op Close method wrapping the provided interface.
 func NopReadWriteCloser(rw io.ReadWriter) io.ReadWriteCloser {
   return DelegateReadWriter(rw)
@@ -97,37 +66,6 @@ func NopWriteCloser(w io.Writer) io.WriteCloser {
 }
 ```
 
-## FSDelegator and FileDelegator
-
-FSDelegator implements FS, ReadDirFS, ReadFileFS, StatFS, SubFS of [io/fs](https://github.com/golang/go/tree/master/src/io/fs) package.
-FSDelegator can override the FS functions that is useful for unit tests.
-
-```go
-package main
-
-import (
-  "errors"
-  "fmt"
-  "io/fs"
-  "os"
-
-  "github.com/jarxorg/io2"
-)
-
-func main() {
-  fsys := io2.DelegateFS(os.DirFS("."))
-  fsys.ReadDirFunc = func(name string) ([]fs.DirEntry, error) {
-    return nil, errors.New("custom")
-  }
-
-  var err error
-  _, err = fs.ReadDir(fsys, ".")
-  fmt.Printf("Error: %v\n", err)
-
-  // Output: Error: custom
-}
-```
-
 ## WriteSeekBuffer
 
 WriteSeekBuffer implements io.Writer, io.Seeker and io.Closer.

example_test.go

@@ -5,41 +5,11 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/fs"
 	"io/ioutil"
-	"log"
-	"os"
 
 	"github.com/jarxorg/io2"
-	"github.com/jarxorg/io2/osfs"
 )
 
-func ExampleWriteFile() {
-	tmpDir, err := ioutil.TempDir("", "example")
-	if err != nil {
-		log.Fatal(err)
-	}
-	defer os.RemoveAll(tmpDir)
-
-	name := "example.txt"
-	content := []byte(`Hello`)
-
-	fsys := osfs.DirFS(tmpDir)
-	_, err = io2.WriteFile(fsys, name, content, fs.ModePerm)
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	wrote, err := ioutil.ReadFile(tmpDir + "/" + name)
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	fmt.Printf("%s\n", string(wrote))
-
-	// Output: Hello
-}
-
 func ExampleDelegateReader() {
 	org := bytes.NewReader([]byte(`original`))
 
@@ -55,37 +25,6 @@ func ExampleDelegateReader() {
 	// Output: Error: custom
 }
 
-func ExampleDelegateFS() {
-	fsys := io2.DelegateFS(os.DirFS("."))
-	fsys.ReadDirFunc = func(name string) ([]fs.DirEntry, error) {
-		return nil, errors.New("custom")
-	}
-
-	var err error
-	_, err = fs.ReadDir(fsys, ".")
-	fmt.Printf("Error: %v\n", err)
-
-	// Output: Error: custom
-}
-
-func ExampleDelegateFile() {
-	fsys := io2.DelegateFS(os.DirFS("."))
-	fsys.OpenFunc = func(name string) (fs.File, error) {
-		return &io2.FileDelegator{
-			StatFunc: func() (fs.FileInfo, error) {
-				return nil, errors.New("custom")
-			},
-		}, nil
-	}
-
-	file, _ := fsys.Open("anyfile")
-	var err error
-	_, err = file.Stat()
-	fmt.Printf("Error: %v\n", err)
-
-	// Output: Error: custom
-}
-
 func ExampleNewWriteSeekerBuffer() {
 	o := io2.NewWriteSeekBuffer(0)
 	o.Write([]byte(`Hello!`))