77 lines
2 KiB
Go
77 lines
2 KiB
Go
// Copyright 2016-2018, Pulumi Corporation.
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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 fsutil
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import (
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"io/ioutil"
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"os"
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"path/filepath"
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)
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// WalkUp walks each file in path, passing the full path to `walkFn`. If walkFn returns true,
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// this method returns the path that was passed to walkFn. Before visiting the parent directory,
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// visitParentFn is called, if that returns false, WalkUp stops its search
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func WalkUp(path string, walkFn func(string) bool, visitParentFn func(string) bool) (string, error) {
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if visitParentFn == nil {
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visitParentFn = func(dir string) bool { return true }
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}
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curr := pathDir(path)
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for {
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// visit each file
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files, err := ioutil.ReadDir(curr)
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if err != nil {
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return "", err
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}
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for _, file := range files {
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name := file.Name()
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path := filepath.Join(curr, name)
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if walkFn(path) {
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return path, nil
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}
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}
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// If we are at the root, stop walking
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if isTop(curr) {
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break
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}
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if !visitParentFn(curr) {
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break
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}
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// visit the parent
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curr = filepath.Dir(curr)
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}
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return "", nil
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}
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// pathDir returns the nearest directory to the given path (identity if a directory; parent otherwise).
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func pathDir(path string) string {
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// If the path is a file, we want the directory it is in
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info, err := os.Stat(path)
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if err != nil || info.IsDir() {
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return path
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}
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return filepath.Dir(path)
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}
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// isTop returns true if the path represents the top of the filesystem.
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func isTop(path string) bool {
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return os.IsPathSeparator(path[len(path)-1])
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}
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