cmd/leapsecsdb/main.go

   1 /*
   2 go.cypherpunks.ru/tai64n -- Pure Go TAI64/TAI64N implementation
   3 Copyright (C) 2020-2022 Sergey Matveev <stargrave@stargrave.org>
   4
   5 This program is free software: you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation, version 3 of the License.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18 package main
  19
  20 import (
  21         "bufio"
  22         "flag"
  23         "fmt"
  24         "log"
  25         "os"
  26         "time"
  27
  28         "go.cypherpunks.ru/tai64n/v2"
  29 )
  30
  31 func main() {
  32         log.SetFlags(0)
  33         flag.Usage = func() {
  34                 fmt.Fprintf(
  35                         flag.CommandLine.Output(),
  36                         `Convert YYYY-MM-DD dates to TAI64 timestamps.
  37 $ leapsecsdb > leapsecs.dat <<EOF
  38 1972-07-01
  39 1973-01-01
  40 EOF
  41 `,
  42                 )
  43                 flag.PrintDefaults()
  44         }
  45         flag.Parse()
  46
  47         scanner := bufio.NewScanner(os.Stdin)
  48         var err error
  49         var t time.Time
  50         tai := new(tai64n.TAI64)
  51         for {
  52                 if !scanner.Scan() {
  53                         if err = scanner.Err(); err != nil {
  54                                 log.Fatalln(err)
  55                         }
  56                         break
  57                 }
  58                 t, err = time.Parse("2006-01-02", scanner.Text())
  59                 if err != nil {
  60                         log.Fatalln(err)
  61                 }
  62                 tai.FromTime(t)
  63                 if _, err = os.Stdout.Write(tai[:]); err != nil {
  64                         log.Fatalln(err)
  65                 }
  66         }
  67 }