Add script to update top-level domains

This adds a simple shell script to update the tld.go constant with the
latest contents of https://data.iana.org/TLD/tlds-alpha-by-domain.txt

Author: wfscheper

tld.go

@@ -9,7 +9,7 @@ package rapid
 import "strings"
 
 // sourced from https://data.iana.org/TLD/tlds-alpha-by-domain.txt
-// Version 2020103100, Last Updated Sat Oct 31 07:07:01 2020 UTC
+// Version 2021090100, Last Updated Thu Sep  2 02:57:25 UTC 2021
 const tldsByAlpha = `
 AAA
 AARP
@@ -224,7 +224,6 @@ CAREERS
 CARS
 CASA
 CASE
-CASEIH
 CASH
 CASINO
 CAT
@@ -236,7 +235,6 @@ CBRE
 CBS
 CC
 CD
-CEB
 CENTER
 CEO
 CERN
@@ -474,7 +472,6 @@ FRONTDOOR
 FRONTIER
 FTR
 FUJITSU
-FUJIXEROX
 FUN
 FUND
 FURNITURE
@@ -640,11 +637,9 @@ ISTANBUL
 IT
 ITAU
 ITV
-IVECO
 JAGUAR
 JAVA
 JCB
-JCP
 JE
 JEEP
 JETZT
@@ -760,7 +755,6 @@ LTD
 LTDA
 LU
 LUNDBECK
-LUPIN
 LUXE
 LUXURY
 LV
@@ -849,7 +843,6 @@ NA
 NAB
 NAGOYA
 NAME
-NATIONWIDE
 NATURA
 NAVY
 NBA
@@ -862,7 +855,6 @@ NETFLIX
 NETWORK
 NEUSTAR
 NEW
-NEWHOLLAND
 NEWS
 NEXT
 NEXTDIRECT
@@ -910,7 +902,6 @@ ONE
 ONG
 ONL
 ONLINE
-ONYOURSIDE
 OOO
 OPEN
 ORACLE
@@ -1110,7 +1101,6 @@ SHOPPING
 SHOUJI
 SHOW
 SHOWTIME
-SHRIRAM
 SI
 SILK
 SINA
@@ -1144,7 +1134,6 @@ SPA
 SPACE
 SPORT
 SPOT
-SPREADBETTING
 SR
 SRL
 SS
@@ -1358,6 +1347,7 @@ XN--42C2D9A
 XN--45BR5CYL
 XN--45BRJ9C
 XN--45Q11C
+XN--4DBRK0CE
 XN--4GBRIM
 XN--54B7FTA0CC
 XN--55QW42G

update_tld.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+
+set -eu
+
+TLD_URL=https://data.iana.org/TLD/tlds-alpha-by-domain.txt
+TLD="$(curl -fsSL https://data.iana.org/TLD/tlds-alpha-by-domain.txt | grep -v '^#')"
+
+cat > tld.go << EOF
+// Copyright 2020 Walter Scheper <walter.scheper@gmail.com>
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+package rapid
+
+import "strings"
+
+// sourced from https://data.iana.org/TLD/tlds-alpha-by-domain.txt
+// Version $(date +%Y%m%d00), Last Updated $(date --utc)
+const tldsByAlpha = \`
+${TLD}
+\`
+
+var tlds = strings.Split(strings.TrimSpace(tldsByAlpha), "\n")
+EOF