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// Copyright 2018 The etcd Authors
//
// 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 fileutil
import (
"os"
"path/filepath"
"sort"
)
// ReadDirOp represents an read-directory operation.
type ReadDirOp struct {
ext string
}
// ReadDirOption configures archiver operations.
type ReadDirOption func(*ReadDirOp)
// WithExt filters file names by their extensions.
// (e.g. WithExt(".wal") to list only WAL files)
func WithExt(ext string) ReadDirOption {
return func(op *ReadDirOp) { op.ext = ext }
}
func (op *ReadDirOp) applyOpts(opts []ReadDirOption) {
for _, opt := range opts {
opt(op)
}
}
// ReadDir returns the filenames in the given directory in sorted order.
func ReadDir(d string, opts ...ReadDirOption) ([]string, error) {
op := &ReadDirOp{}
op.applyOpts(opts)
dir, err := os.Open(d)
if err != nil {
return nil, err
}
defer dir.Close()
names, err := dir.Readdirnames(-1)
if err != nil {
return nil, err
}
sort.Strings(names)
if op.ext != "" {
tss := make([]string, 0)
for _, v := range names {
if filepath.Ext(v) == op.ext {
tss = append(tss, v)
}
}
names = tss
}
return names, nil
}
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