add script with some source options, as maia.usno.navy.mil is still down

.github/workflows/unit-tests.yml

@@ -10,7 +10,7 @@ jobs:
     name: Build
     strategy:
       matrix:
-        goVer: ["1.11.x", "1.12.x", "1.13.x"]
+        goVer: ["1.13.x", "1.17.x"]
         platform: [ubuntu-latest]
     runs-on: ${{ matrix.platform }}
     steps:

.gitignore

@@ -0,0 +1 @@
+/leaps.dat

tools/generate.go

@@ -106,12 +106,12 @@ func main() {
 		}
 
 		line = strings.TrimSpace(line)
-		if line == "" {
+		if line == "" || strings.HasPrefix(line, ";") {
 			continue
 		}
 
 		parts := strings.Fields(line)
-		t, err := time.Parse("2006 Jan 2", strings.Title(strings.Join(parts[0:3], " ")))
+		t, err := time.Parse("2006-1-2", strings.Title(strings.Join(parts[0:3], "-")))
 		if err != nil {
 			fmt.Println(err)
 			continue
@@ -121,7 +121,7 @@ func main() {
 			continue
 		}
 
-		s, err := strconv.ParseFloat(parts[6], 32)
+		s, err := strconv.ParseFloat(parts[3], 32)
 		if err != nil {
 			fmt.Println(err)
 			continue

tools/update-leaps.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+# sometimes sites go offline, so list a few options.
+# just use one.
+{
+    #curl -s 'http://maia.usno.navy.mil/ser7/tai-utc.dat'
+    #curl -s 'https://cdf.gsfc.nasa.gov/html/CDFLeapSeconds.txt'
+    #curl -s 'https://hpiers.obspm.fr/iers/bul/bulc/Leap_Second.dat'| grep -v '^#'| awk '{print $4" "$3" "$2" "$5}'
+} > leaps.dat
+
+go run ./tools/generate.go -input leaps.dat -output offsets.go -pkg tai64
+go fmt offsets.go