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// Copyright 2011 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.
// This file defines types for abstract file system access and
// provides an implementation accessing the file system of the
// underlying OS.
package main
import (
"fmt"
"io"
"io/ioutil"
"os"
)
// The FileInfo interface provides access to file information.
type FileInfo interface {
Name() string
Size() int64
Mtime_ns() int64
IsRegular() bool
IsDirectory() bool
}
// The FileSystem interface specifies the methods godoc is using
// to access the file system for which it serves documentation.
type FileSystem interface {
Open(path string) (io.ReadCloser, os.Error)
Lstat(path string) (FileInfo, os.Error)
Stat(path string) (FileInfo, os.Error)
ReadDir(path string) ([]FileInfo, os.Error)
ReadFile(path string) ([]byte, os.Error)
}
// ----------------------------------------------------------------------------
// OS-specific FileSystem implementation
var OS FileSystem = osFS{}
// osFI is the OS-specific implementation of FileInfo.
type osFI struct {
*os.FileInfo
}
func (fi osFI) Name() string {
return fi.FileInfo.Name
}
func (fi osFI) Size() int64 {
if fi.IsDirectory() {
return 0
}
return fi.FileInfo.Size
}
func (fi osFI) Mtime_ns() int64 {
return fi.FileInfo.Mtime_ns
}
// osFS is the OS-specific implementation of FileSystem
type osFS struct{}
func (osFS) Open(path string) (io.ReadCloser, os.Error) {
f, err := os.Open(path)
if err != nil {
return nil, err
}
fi, err := f.Stat()
if err != nil {
return nil, err
}
if fi.IsDirectory() {
return nil, fmt.Errorf("Open: %s is a directory", path)
}
return f, nil
}
func (osFS) Lstat(path string) (FileInfo, os.Error) {
fi, err := os.Lstat(path)
return osFI{fi}, err
}
func (osFS) Stat(path string) (FileInfo, os.Error) {
fi, err := os.Stat(path)
return osFI{fi}, err
}
func (osFS) ReadDir(path string) ([]FileInfo, os.Error) {
l0, err := ioutil.ReadDir(path) // l0 is sorted
if err != nil {
return nil, err
}
l1 := make([]FileInfo, len(l0))
for i, e := range l0 {
l1[i] = osFI{e}
}
return l1, nil
}
func (osFS) ReadFile(path string) ([]byte, os.Error) {
return ioutil.ReadFile(path)
}
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