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//usr/bin/env go run $0 $@; exit $?
package main

import (
    "fmt"
    "io/ioutil"
     "log"
    "os"
)

// =============================================================================
// Functions
// =============================================================================

func Usage(progname, mesg string) {
        log.Print ("Usage: " + progname + " directory")
        log.Fatal (mesg)
}

func traverse(s string) {
        curdir, err :=  os.Getwd()
        if err := os.Chdir(s); err != nil {
                log.Fatal(err)
        }
        if err != nil {
                log.Fatal(err)
        }
        curdir2, err := os.Getwd()
        files, err := ioutil.ReadDir(curdir2)
        if err != nil {
                log.Fatal(err)
        }
        for _, f := range files {
                fmt.Println (curdir2 + "/" + f.Name())
                //fmt.Println(f.Name())
                fi, err := os.Stat(f.Name())
                if err != nil {
                        log.Fatal(err)
                }
                mode := fi.Mode();
                if mode.IsDir() {
                        traverse(fi.Name())
                }
        }
        os.Chdir(curdir)
}

func start_traverse(s string) {
        fmt.Println(s)
        traverse(s)
}

// =============================================================================
// MAIN
// =============================================================================

func main() {
        progname := os.Args[0]
        if len(os.Args) < 2 {
                Usage(progname, "ERROR: 1 argument expected")
        }
        directory := os.Args[1]
        fi, err := os.Stat(directory)
        if err != nil  {
                _ = err // ugly hack to allow not using the err variable
                Usage(progname, "ERROR: Not a directory : " + directory)
        }
        if fi.IsDir() {
                start_traverse(directory)
        } else {
                Usage(progname, "ERROR: Not a directory : " + directory)
        }

}