recursive folder scans

folder_map.go

package main

import (
	"fmt"
	"io/ioutil"
	"path"
	"path/filepath"
	"strings"
	"sync"
)

var wg sync.WaitGroup

func main() {
	wg.Add(1)

	go ScanDir(".", ".xlsx", 0, func(name string) {
		fmt.Println(name)
		// file, _ := os.Open(name)
		// b := make([]byte, 50)
		// file.Read(b)
		// fmt.Printf("%s: %s\n", name, string(b))

	})

	wg.Wait()
}

func ScanDir(dir, ext string, indent int, fn func(string)) {
	defer wg.Done()
	d, err := ioutil.ReadDir(dir)
	if err != nil {
		fmt.Println(err)
	}

	for _, f := range d {
		fname := f.Name()
		if f.IsDir() {
			// fmt.Printf("%s%s\t%s (DIR)\n", strings.Repeat("\t", indent), dir, fname)
			wg.Add(1)
			go ScanDir(path.Join(dir, fname), ext, indent+1, fn)
		} else {
			if ext == "" {
				fmt.Printf("%s%s\n", strings.Repeat("\t", indent), filepath.Join(dir, fname))
			} else if path.Ext(fname) == ext {
				// fmt.Printf("%s%s\n", strings.Repeat("\t", indent), name)
				name := filepath.Join(dir, fname)
				go fn(name)
			}
		}
	}
}