Walk in Go

Posted by GoDoc

Public (Editable by Users)

Walk walks the file tree rooted at root, calling walkFn for each file or directory in the tree, including root. All errors that arise visiting files and directories are filtered by walkFn. The files are walked in lexical order, which makes the output deterministic but means that for very large directories Walk can be inefficient. Walk does not follow symbolic links.

Language Go

Dependencies

import "fmt"

import "io/ioutil"

import "os"

import "path/filepath"

Edit

main.go

// +build !windows,!plan9

package main

import (
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
)

func prepareTestDirTree(tree string) (string, error) {
	tmpDir, err := ioutil.TempDir("", "")
	if err != nil {
		return "", fmt.Errorf("error creating temp directory: %v\n", err)
	}

	err = os.MkdirAll(filepath.Join(tmpDir, tree), 0755)
	if err != nil {
		os.RemoveAll(tmpDir)
		return "", err
	}

	return tmpDir, nil
}

func main() {
	tmpDir, err := prepareTestDirTree("dir/to/walk/skip")
	if err != nil {
		fmt.Printf("unable to create test dir tree: %v\n", err)
		return
	}
	defer os.RemoveAll(tmpDir)
	os.Chdir(tmpDir)

	subDirToSkip := "skip"

	fmt.Println("On Unix:")
	err = filepath.Walk(".", func(path string, info os.FileInfo, err error) error {
		if err != nil {
			fmt.Printf("prevent panic by handling failure accessing a path %q: %v\n", path, err)
			return err
		}
		if info.IsDir() && info.Name() == subDirToSkip {
			fmt.Printf("skipping a dir without errors: %+v \n", info.Name())
			return filepath.SkipDir
		}
		fmt.Printf("visited file or dir: %q\n", path)
		return nil
	})
	if err != nil {
		fmt.Printf("error walking the path %q: %v\n", tmpDir, err)
		return
	}
}

Stdout
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