What egven
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169
fs.go
169
fs.go
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package nasin
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import "io"
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import "os"
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import "io/fs"
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import "strings"
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import "path/filepath"
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// FS is an io.FS with extended capabilities that include writing to the
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// underlying filesystem.
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type FS interface {
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fs.FS
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fs.ReadDirFS
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fs.ReadFileFS
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// OpenFile is like os.OpenFile.
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OpenFile (name string, flag int, perm os.FileMode) (FileWriter, error)
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// Remove removes the named file or (empty) directory.
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Remove (name string) error
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// RemoveAll removes name and any children it contains.
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RemoveAll (name string) error
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// Rename renames (moves) oldname to newname.
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Rename (oldname, newname string) error
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}
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// FileWriter is a writable version of fs.File.
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type FileWriter interface {
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fs.File
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io.Writer
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}
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type writeFs struct {
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path string
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}
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func pathErr (op, path string, err error) error {
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return &fs.PathError {
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Op: op,
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Path: path,
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Err: err,
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}
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}
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func (this writeFs) subPath (name string) (string, error) {
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if !fs.ValidPath(name) { return "", fs.ErrInvalid }
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if strings.Contains(name, "/") { return "", fs.ErrInvalid }
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return filepath.Join(this.path, name), nil
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}
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// Open opens the named file.
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func (this writeFs) Open (name string) (fs.File, error) {
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path, err := this.subPath(name)
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if err != nil {
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return nil, pathErr("open", name, err)
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}
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return os.Open(path)
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}
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// Create creates or truncates the named file.
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func (this writeFs) Create (name string) (FileWriter, error) {
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path, err := this.subPath(name)
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if err != nil {
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return nil, pathErr("create", name, err)
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}
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return os.Create(path)
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}
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// OpenFile is the generalized open call; most users will use Open or Create
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// instead.
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func (this writeFs) OpenFile (
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name string,
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flag int,
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perm os.FileMode,
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) (
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FileWriter,
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error,
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) {
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path, err := this.subPath(name)
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if err != nil {
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return nil, pathErr("open", name, err)
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}
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return os.OpenFile(path, flag, perm)
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}
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// ReadDir reads the named directory and returns a list of directory entries
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// sorted by filename.
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func (this writeFs) ReadDir (name string) ([]fs.DirEntry, error) {
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path, err := this.subPath(name)
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if err != nil {
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return nil, pathErr("readdir", name, err)
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}
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return os.ReadDir(path)
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}
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// ReadFile reads the named file and returns its contents.
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// A successful call returns a nil error, not io.EOF.
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// (Because ReadFile reads the whole file, the expected EOF
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// from the final Read is not treated as an error to be reported.)
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//
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// The caller is permitted to modify the returned byte slice.
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func (this writeFs) ReadFile (name string) ([]byte, error) {
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path, err := this.subPath(name)
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if err != nil {
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return nil, pathErr("readfile", name, err)
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}
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return os.ReadFile(path)
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}
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// WriteFile writes data to the named file, creating it if necessary.
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func (this writeFs) WriteFile (name string, data []byte, perm os.FileMode) error {
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path, err := this.subPath(name)
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if err != nil {
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return pathErr("writefile", name, err)
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}
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return os.WriteFile(path, data, perm)
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}
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// Stat returns a FileInfo describing the file.
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func (this writeFs) Stat (name string) (fs.FileInfo, error) {
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path, err := this.subPath(name)
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if err != nil {
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return nil, pathErr("stat", name, err)
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}
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return os.Stat(path)
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}
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// Remove removes the named file or (empty) directory.
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func (this writeFs) Remove (name string) error {
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path, err := this.subPath(name)
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if err != nil {
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return pathErr("remove", name, err)
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}
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return os.Remove(path)
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}
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// RemoveAll removes name and any children it contains.
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func (this writeFs) RemoveAll (name string) error {
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path, err := this.subPath(name)
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if err != nil {
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return pathErr("removeall", name, err)
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}
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return os.RemoveAll(path)
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}
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// Rename renames (moves) oldname to newname.
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func (this writeFs) Rename (oldname, newname string) error {
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oldpath, err := this.subPath(oldname)
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if err != nil {
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return pathErr("rename", oldname, err)
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}
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newpath, err := this.subPath(newname)
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if err != nil {
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return pathErr("rename", newname, err)
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}
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return os.Rename(oldpath, newpath)
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}
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