From a23dc6b753a9f092a9818a4410128c35a9597098 Mon Sep 17 00:00:00 2001
From: Jeremy Ashkenas <jashkenas@gmail.com>
Date: Thu, 25 Feb 2010 18:54:08 -0500
Subject: [PATCH] raising an error on unrecognized options

---
 lib/optparse.js     | 7 ++++++-
 src/optparse.coffee | 3 +++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/lib/optparse.js b/lib/optparse.js
index 14d4027d..f7af671e 100755
--- a/lib/optparse.js
+++ b/lib/optparse.js
@@ -12,7 +12,7 @@
   // specified options, and returning it. options.arguments will be an array
   // containing the remaning non-option arguments.
   op.prototype.parse = function parse(args) {
-    var _a, _b, arg, is_option, options, rule;
+    var _a, _b, arg, is_option, matched_rule, options, rule;
     arguments = Array.prototype.slice.call(arguments, 0);
     options = {
       arguments: []
@@ -20,14 +20,19 @@
     args = args.slice(0);
     while (arg = args.shift()) {
       is_option = !!(arg.match(LONG_FLAG) || arg.match(SHORT_FLAG));
+      matched_rule = false;
       _a = this.rules;
       for (_b = 0; _b < _a.length; _b++) {
         rule = _a[_b];
         if (rule.letter === arg || rule.flag === arg) {
           options[rule.name] = rule.has_argument ? args.shift() : true;
+          matched_rule = true;
           break;
         }
       }
+      if (is_option && !matched_rule) {
+        throw new Error("unrecognized option: " + arg);
+      }
       if (!(is_option)) {
         options.arguments.push(arg);
       }
diff --git a/src/optparse.coffee b/src/optparse.coffee
index 3e2c588e..46f09ec9 100644
--- a/src/optparse.coffee
+++ b/src/optparse.coffee
@@ -14,10 +14,13 @@ op::parse: (args) ->
   args: args.slice 0
   while arg: args.shift()
     is_option: !!(arg.match(LONG_FLAG) or arg.match(SHORT_FLAG))
+    matched_rule: no
     for rule in @rules
       if rule.letter is arg or rule.flag is arg
         options[rule.name]: if rule.has_argument then args.shift() else true
+        matched_rule: yes
         break
+    throw new Error "unrecognized option: " + arg if is_option and not matched_rule
     options.arguments.push arg unless is_option
   options