1 files changed, 104 insertions, 0 deletions
diff --git a/src/cmd/godoc/filesystem.go b/src/cmd/godoc/filesystem.go
new file mode 100644
index 000000000..a68c08592
--- /dev/null
+++ b/src/cmd/godoc/filesystem.go
@@ -0,0 +1,104 @@
+// 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)
+}