gistfile1.go

package main

import "fmt"
import "os"

func main() {
    source_dir_path      := "/some/dir"
    destination_dir_path := "/some/other/dir"

    ensure_source_directory_exists(source_dir_path)
    ensure_destination_directory_exists(destination_dir_path)

    file.walk(source_dir_path, handle_file) 

    fmt.Printf("Done.\n")
    os.Exit(0)
}

func handle_file(path string, f os.FileInfo, err Error) (error) {
    copy_file(path, destination_dir_path)
    return nil
}

func ensure_source_directory_exists(source_dir_path string) (bool) {
    result, _ := path_exists(source_dir_path)
    if !result {
      fmt.Printf("Source dir doesn't exist.\n")
      os.Exit(1)
    }
    return result
}

func ensure_destination_directory_exists(destination_dir_path string) (bool) {
    result, _ := path_exists(destination_dir_path)
    if !result {
      fmt.Printf("Destination dir doesn't exist.\n")
      os.Exit(1)
    }
    return result
}

func path_exists(path string) (bool, error) {
    _, err := os.Stat(path)
    if err == nil { return true, nil }
    if os.IsNotExist(err) { return false, nil }
    return false, err
}