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// Copyright 2014 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package fs
import (
"bytes"
"io"
"net/http"
"path"
"path/filepath"
)
// Walk walks the file tree rooted at root,
// calling walkFn for each file or directory in the tree, including root.
// All errors that arise visiting files and directories are filtered by walkFn.
//
// As with filepath.Walk, if the walkFn returns filepath.SkipDir, then the directory is skipped.
func Walk(hfs http.FileSystem, root string, walkFn filepath.WalkFunc) error {
dh, err := hfs.Open(root)
if err != nil {
return err
}
di, err := dh.Stat()
if err != nil {
return err
}
fis, err := dh.Readdir(-1)
dh.Close()
if err = walkFn(root, di, err); err != nil {
if err == filepath.SkipDir {
return nil
}
return err
}
for _, fi := range fis {
fn := path.Join(root, fi.Name())
if fi.IsDir() {
if err = Walk(hfs, fn, walkFn); err != nil {
if err == filepath.SkipDir {
continue
}
return err
}
continue
}
if err = walkFn(fn, fi, nil); err != nil {
if err == filepath.SkipDir {
continue
}
return err
}
}
return nil
}
// ReadFile reads the contents of the file of hfs specified by name.
// Just as ioutil.ReadFile does.
func ReadFile(hfs http.FileSystem, name string) ([]byte, error) {
fh, err := hfs.Open(name)
if err != nil {
return nil, err
}
var buf bytes.Buffer
_, err = io.Copy(&buf, fh)
fh.Close()
return buf.Bytes(), err
}
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