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71 lines
1.6 KiB
71 lines
1.6 KiB
// Copyright 2018 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package fileutil
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import (
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"os"
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"path/filepath"
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"sort"
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)
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// ReadDirOp represents an read-directory operation.
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type ReadDirOp struct {
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ext string
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}
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// ReadDirOption configures archiver operations.
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type ReadDirOption func(*ReadDirOp)
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// WithExt filters file names by their extensions.
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// (e.g. WithExt(".wal") to list only WAL files)
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func WithExt(ext string) ReadDirOption {
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return func(op *ReadDirOp) { op.ext = ext }
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}
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func (op *ReadDirOp) applyOpts(opts []ReadDirOption) {
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for _, opt := range opts {
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opt(op)
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}
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}
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// ReadDir returns the filenames in the given directory in sorted order.
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func ReadDir(d string, opts ...ReadDirOption) ([]string, error) {
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op := &ReadDirOp{}
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op.applyOpts(opts)
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dir, err := os.Open(d)
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if err != nil {
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return nil, err
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}
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defer dir.Close()
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names, err := dir.Readdirnames(-1)
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if err != nil {
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return nil, err
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}
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sort.Strings(names)
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if op.ext != "" {
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tss := make([]string, 0)
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for _, v := range names {
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if filepath.Ext(v) == op.ext {
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tss = append(tss, v)
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}
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}
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names = tss
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}
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return names, nil
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}
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