From 9d1b71736ad13e498537d1c7b3b45d94f078c696 Mon Sep 17 00:00:00 2001
From: Shrikant Sharat <shrikantsharat.k@gmail.com>
Date: Sat, 11 Aug 2012 15:24:21 +0530
Subject: [PATCH] Detect repeated arguments and report them.

---
 antigen.zsh        | 10 ++++++++++
 tests/arg-parser.t | 10 ++++++++++
 2 files changed, 20 insertions(+)

diff --git a/antigen.zsh b/antigen.zsh
index 214ce95..af8c80e 100644
--- a/antigen.zsh
+++ b/antigen.zsh
@@ -391,6 +391,11 @@ antigen () {
         local name="${${name_spec%\?}%:}"
         local value="$1"
 
+        if echo "$code" | grep -qm1 "^local $name="; then
+            echo "Argument '$name' repeated with the value '$value'". >&2
+            return
+        fi
+
         --add-var $name "$value"
 
         shift
@@ -418,6 +423,11 @@ antigen () {
             local value="${arg#*=}"
         fi
 
+        if echo "$code" | grep -qm1 "^local $name="; then
+            echo "Argument '$name' repeated with the value '$value'". >&2
+            return
+        fi
+
         # The specification for this argument, used for validations.
         local arg_line="$(echo "$keyword_args" | grep -m1 "^$name:\??\?")"
 
diff --git a/tests/arg-parser.t b/tests/arg-parser.t
index 2b225ab..b1f58e5 100644
--- a/tests/arg-parser.t
+++ b/tests/arg-parser.t
@@ -52,3 +52,13 @@ Positional argument as a keyword argument.
 
   $ parse --url=some-url
   local url='some-url'
+
+Repeated keyword arguments.
+
+  $ parse --url=url1 --url=url2
+  Argument 'url' repeated with the value 'url2'.
+
+Repeated, once as positional and once more as keyword.
+
+  $ parse url1 --url=url2
+  Argument 'url' repeated with the value 'url2'.
-- 
2.0.0