[PATCH] 26.0.50.3, add $TTL directove to dns-mode.el

[Alexander Kuleshov <kuleshovmail@gmail.com>]

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Hello everyone,

This simple patch adds `$TTL` directive to dns-mode-font-lock-keywords
from the lisp/text-modes/dns-mode.el.

The global `$TTL` directive (time-to-live) specifies the duration in seconds
that the record may be cached by any resolver. In general it should looks:

$TTL amount-of-ttl (in seconds)

Additionally d/D/h/H/w/W/m/M/s/S maybe added to amount-of-ttl where d/D -
days, h/H - hours and etc..

Thank you.

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From 2209894bc51367570c38a3428be6f4f1e2bc25a2 Mon Sep 17 00:00:00 2001
From: Alexander Kuleshov <kuleshovmail@gmail.com>
Date: Thu, 12 Jan 2017 15:26:02 +0600
Subject: [PATCH] Add support for $TTL dns directive

* lisp/text-modes/dns-mode.el (dns-mode-font-lock-keywords): Add $TTL
directive.
---
 lisp/textmodes/dns-mode.el | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lisp/textmodes/dns-mode.el b/lisp/textmodes/dns-mode.el
index 02cb2a2..6a3cfcb 100644
--- a/lisp/textmodes/dns-mode.el
+++ b/lisp/textmodes/dns-mode.el
@@ -79,6 +79,7 @@ dns-mode-class-face
 (defcustom dns-mode-font-lock-keywords
   `(("^$ORIGIN" 0 ,dns-mode-control-entity-face)
     ("^$INCLUDE" 0 ,dns-mode-control-entity-face)
+    ("^$TTL\s+[0-9]+[WwDdHhMmSs]?" 0 ,dns-mode-control-entity-face)
     ("^$[a-z0-9A-Z]+" 0 ,dns-mode-bad-control-entity-face)
     (,(regexp-opt dns-mode-classes) 0 ,dns-mode-class-face)
     (,(regexp-opt dns-mode-types) 0 ,dns-mode-type-face))
-- 
2.8.0.rc3.1353.gea9bdc0