From 95a5aa61f38487d11a089ae2e9cadb5240201685 Mon Sep 17 00:00:00 2001
From: Christian Helbling
Date: Mon, 29 Oct 2018 13:52:51 +0100
Subject: warn when using the same short option twice

---
 it.class | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/it.class b/it.class
index 0a3fc18..f9c5846 100644
--- a/it.class
+++ b/it.class
@@ -839,7 +839,11 @@ static function getopt($usage, $p = array())
 		if ($longoptname || $shortoptname)
 		{
 			if ($longoptname && ($shortoptname || $shortoptname === "0"))
+			{
+				if ($alias[$shortoptname])
+					it::error("getopt: short option -$shortoptname is used twice: --{$alias[$shortoptname]} and --$longoptname!");
 				$alias[$shortoptname] = $longoptname;
+			}
 
 			$witharg[$longoptname ? $longoptname : $shortoptname] = $longoptarg || $shortoptarg;
 		}
-- 
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