forked from golang/tools
/
fs.go
80 lines (66 loc) · 1.69 KB
/
fs.go
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// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build go1.16
// +build go1.16
package vfs
import (
"io/fs"
"os"
"path"
"strings"
)
// FromFS converts an fs.FS to the FileSystem interface.
func FromFS(fsys fs.FS) FileSystem {
return &fsysToFileSystem{fsys}
}
type fsysToFileSystem struct {
fsys fs.FS
}
func (f *fsysToFileSystem) fsPath(name string) string {
name = path.Clean(name)
if name == "/" {
return "."
}
return strings.TrimPrefix(name, "/")
}
func (f *fsysToFileSystem) Open(name string) (ReadSeekCloser, error) {
file, err := f.fsys.Open(f.fsPath(name))
if err != nil {
return nil, err
}
if rsc, ok := file.(ReadSeekCloser); ok {
return rsc, nil
}
return &noSeekFile{f.fsPath(name), file}, nil
}
func (f *fsysToFileSystem) Lstat(name string) (os.FileInfo, error) {
return fs.Stat(f.fsys, f.fsPath(name))
}
func (f *fsysToFileSystem) Stat(name string) (os.FileInfo, error) {
return fs.Stat(f.fsys, f.fsPath(name))
}
func (f *fsysToFileSystem) RootType(name string) RootType { return "" }
func (f *fsysToFileSystem) ReadDir(name string) ([]os.FileInfo, error) {
dirs, err := fs.ReadDir(f.fsys, f.fsPath(name))
var infos []os.FileInfo
for _, d := range dirs {
info, err1 := d.Info()
if err1 != nil {
if err == nil {
err = err1
}
continue
}
infos = append(infos, info)
}
return infos, err
}
func (f *fsysToFileSystem) String() string { return "io/fs" }
type noSeekFile struct {
path string
fs.File
}
func (f *noSeekFile) Seek(offset int64, whence int) (int64, error) {
return 0, &fs.PathError{Op: "seek", Path: f.path, Err: fs.ErrInvalid}
}