scan_for_large_files.go

package main

import (
	"os"
	"path/filepath"
	"strconv"
)

func main() {
	var dir string
	var size int64

	if len(os.Args) == 3 {
		dir = os.Args[1]

		sizeInt, err := strconv.Atoi(os.Args[2])
		if err != nil {
			panic(err)
		}

		size = int64(sizeInt)
	}

	scnnr := FindBySize{
		Directory: dir,
		Size:      size,
	}

	err := scnnr.Scan()
	if err != nil {
		panic(err)
	}
}

// FindBySize holds cli args
type FindBySize struct {
	Directory string
	Size      int64
	Found     []string
}

// Scan walks the given directory tree
func (f *FindBySize) Scan() error {
	err := filepath.Walk(f.Directory, f.scan)
	if err != nil {
		return err
	}

	return nil
}

func (f *FindBySize) scan(path string, info os.FileInfo, err error) error {
	if err != nil {
		return err
	}

	if !info.IsDir() {
		if info.Size() > f.Size {
			f.Found = append(f.Found, path)
		}
	}

	return nil
}