Leapsecs and TAI64 support

[gotai64n.git] / cmd / leapsecsdb / main.go

diff --git a/cmd/leapsecsdb/main.go b/cmd/leapsecsdb/main.go
new file mode 100644 (file)
index 0000000..82c5295
--- /dev/null
+++ b/cmd/leapsecsdb/main.go
@@ -0,0 +1,67 @@
+/*
+go.cypherpunks.ru/tai64n -- Pure Go TAI64/TAI64N implementation
+Copyright (C) 2020-2021 Sergey Matveev <stargrave@stargrave.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, version 3 of the License.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package main
+
+import (
+       "bufio"
+       "flag"
+       "fmt"
+       "log"
+       "os"
+       "time"
+
+       "go.cypherpunks.ru/tai64n/v2"
+)
+
+func main() {
+       log.SetFlags(0)
+       flag.Usage = func() {
+               fmt.Fprintf(
+                       flag.CommandLine.Output(),
+                       `Convert YYYY-MM-DD dates to TAI64 timestamps.
+$ leapsecsdb > leapsecs.dat <<EOF
+1972-07-01
+1973-01-01
+EOF
+`,
+               )
+               flag.PrintDefaults()
+       }
+       flag.Parse()
+
+       scanner := bufio.NewScanner(os.Stdin)
+       var err error
+       var t time.Time
+       tai := new(tai64n.TAI64)
+       for {
+               if !scanner.Scan() {
+                       if err = scanner.Err(); err != nil {
+                               log.Fatalln(err)
+                       }
+                       break
+               }
+               t, err = time.Parse("2006-01-02", scanner.Text())
+               if err != nil {
+                       log.Fatalln(err)
+               }
+               tai.FromTime(t)
+               if _, err = os.Stdout.Write(tai[:]); err != nil {
+                       log.Fatalln(err)
+               }
+       }
+}