Iterate over all files and folders for a path in Go (Golang)

‘Walk’ function of ‘filepath’ package can be used to recursively iterate over all files/folder in a directory tree.

https://golang.org/pkg/path/filepath/

‘Walk’ function will walk the entire tree rooted at the root path include all subdirectories.  Below is the signature of the function

type WalkFunc func(path string, info os.FileInfo, err error) error

The WalkFunc will be called for with the path of the file/folder and fileInfo or the error if any error occurred while walking that file/folder.

Some things to note about Walk function

• All errors are filtered. An error might arise while opening/visiting the file
• The function does not follow symbolic links
• The files are walked in lexical order

Let’s see an example:

package main

import (
    "fmt"
    "log"
    "os"
    "path/filepath"
)

func main() {
    currentDirectory, err := os.Getwd()
    if err != nil {
        log.Fatal(err)
    }
    iterate(currentDirectory)
}

func iterate(path string) {
    filepath.Walk(path, func(path string, info os.FileInfo, err error) error {
        if err != nil {
            log.Fatalf(err.Error())
        }
        fmt.Printf("File Name: %s\n", info.Name())
        return nil
    })
}