46: find

This exercise is pending. Quick notes about this exercise:

• My implemention is at https://lcthw.dev/go/go-coreutils
• https://www.gnu.org/software/findutils/manual/html_mono/find.html
• os -- https://pkg.go.dev/os@go1.25.3
• path -- probably all of them use it
• regex -- https://pkg.go.dev/regexp@go1.25.3
• slices -- https://pkg.go.dev/slices@go1.25.3
• strings -- https://pkg.go.dev/strings@go1.25.3

The Code

View Source file go-coreutils/find/main.go Only

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
        })
    }
}