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minio/pkg/ioutils/ioutils.go

65 lines
1.7 KiB

/*
* Minio Cloud Storage, (C) 2016 Minio, Inc.
*
* 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 ioutils
import (
"os"
"sort"
)
// byName implements sort.Interface for sorting os.FileInfo list.
type byName []os.FileInfo
func (f byName) Len() int { return len(f) }
func (f byName) Less(i, j int) bool { return f[i].Name() < f[j].Name() }
func (f byName) Swap(i, j int) { f[i], f[j] = f[j], f[i] }
// ReadDirN reads the directory named by dirname and returns
// a list of sorted directory entries of size 'n'.
func ReadDirN(dirname string, n int) ([]os.FileInfo, error) {
f, err := os.Open(dirname)
if err != nil {
return nil, err
}
list, err := f.Readdir(n)
if err != nil {
return nil, err
}
if err = f.Close(); err != nil {
return nil, err
}
sort.Sort(byName(list))
return list, nil
}
// ReadDirNamesN reads the directory named by dirname and returns
// a list of sorted directory names of size 'n'.
func ReadDirNamesN(dirname string, n int) ([]string, error) {
f, err := os.Open(dirname)
if err != nil {
return nil, err
}
names, err := f.Readdirnames(n)
if err != nil {
return nil, err
}
if err = f.Close(); err != nil {
return nil, err
}
sort.Strings(names)
return names, nil
}