package main

import (
  "fmt"
  "flag"
  "path/filepath"
  "regexp"
  "log"
  "io/fs"
)

type Opts struct {
	Name string
	Type string
	Print bool
}

func main() {
	var opts Opts

	flag.StringVar(&opts.Name, "name", "", "regex of file")
	flag.StringVar(&opts.Type, "type", "f", "type to find")
	flag.Parse()

	re, err := regexp.Compile(opts.Name)
	if err != nil { log.Fatal(err) }

	if flag.NArg() == 0 {
		log.Fatal("USAGE: find -name <regex> [-type d/f] <dir> [dir dir]")
	}

	for _, start := range flag.Args() {
		filepath.WalkDir(start, func (path string, d fs.DirEntry, err error) error {
			if re.MatchString(path) && opts.Print {
				if opts.Type == "" {
					fmt.Println(path)
				} else if d.IsDir() && opts.Type == "d" {
					fmt.Println(path)
				} else if !d.IsDir() && opts.Type == "f" {
					fmt.Println(path)
				}
			}

			return nil
		})
	}
}