1// Copyright 2018 The Bazel Authors. All rights reserved. 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14 15// Package walk provides an utility function to walk a directory tree collecting and deduping files. 16package walk 17 18import ( 19 "fmt" 20 "os" 21 "path/filepath" 22) 23 24// Files traverses a list of paths and returns a list of all the seen files. 25func Files(paths []string) ([]string, error) { 26 var files []string 27 seen := make(map[string]bool) 28 visitFunc := func(path string, info os.FileInfo, err error) error { 29 if err != nil { 30 return err 31 } 32 if seen[path] { 33 return nil 34 } 35 seen[path] = true 36 switch fType := info.Mode(); { 37 case fType.IsDir(): 38 // Do nothing. 39 default: 40 files = append(files, path) 41 } 42 return nil 43 } 44 for _, p := range paths { 45 err := filepath.Walk(p, visitFunc) 46 if err != nil { 47 return nil, fmt.Errorf("got error while walking %s got: %v", p, err) 48 } 49 } 50 return files, nil 51} 52