package main

import (

"fmt"

"regexp"

"strconv"

"time"

)

func duration(s string) (time.Duration, error) {

re := regexp.MustCompile(`^(\d+)([HhDdMmYy])$`)

if m := re.FindStringSubmatch(s); m != nil {

v, err := strconv.ParseUint(m[1], 10, 0)

if err != nil {

return 0, err

}

switch m[2] {

case "H", "h":

return time.Hour * time.Duration(v), nil

case "D", "d":

return time.Hour * time.Duration(24*v), nil

case "M", "m":

return time.Hour * time.Duration(24*30*v), nil

case "Y", "y":

return time.Hour * time.Duration(24*365*v), nil

}

}

return 0, fmt.Errorf("unrecognized time spec '%s'", s)

}

func uniq(l []string) []string {

seen := make(map[string] bool)

u := make([]string, 0)

for _, s := range l {

if !seen[s] {

u = append(u, s)

}

seen[s] = true

}

return u

}