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// Copyright 2018 The Bazel Authors. 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 walk provides an utility function to walk a directory tree collecting and deduping files.
package walk
import (
"fmt"
"os"
"path/filepath"
)
// Files traverses a list of paths and returns a list of all the seen files.
func Files(paths []string) ([]string, error) {
var files []string
seen := make(map[string]bool)
visitFunc := func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if seen[path] {
return nil
}
seen[path] = true
switch fType := info.Mode(); {
case fType.IsDir():
// Do nothing.
default:
files = append(files, path)
}
return nil
}
for _, p := range paths {
err := filepath.Walk(p, visitFunc)
if err != nil {
return nil, fmt.Errorf("got error while walking %s got: %v", p, err)
}
}
return files, nil
}
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