add friendly error message when giving argless plugins args

diff --git a/lib/MooseX/Runnable/Invocation.pm b/lib/MooseX/Runnable/Invocation.pm
index 644d246..2fb34b7 100644 (file)
--- a/lib/MooseX/Runnable/Invocation.pm
+++ b/lib/MooseX/Runnable/Invocation.pm
@@ -45,8 +45,11 @@ sub BUILD {
 
         Class::MOP::load_class( $plugin );
 
+        my $does_cmdline = $plugin->meta->
+          does_role('MooseX::Runnable::Invocation::Plugin::Role::CmdlineArgs');
+
         my $args;
-        if($plugin->meta->does_role('MooseX::Runnable::Invocation::Plugin::Role::CmdlineArgs')){
+        if($does_cmdline){
             $args = eval {
                 $plugin->_build_initargs_from_cmdline(
                     @{$self->plugins->{$orig}},
@@ -57,6 +60,13 @@ sub BUILD {
                 confess "Error building initargs for $plugin: $@";
             }
         }
+        elsif(!$does_cmdline && scalar @{$self->plugins->{$orig}} > 0){
+            confess "You supplied arguments to the $orig plugin, but it".
+              " does not know how to accept them.  Perhaps the plugin".
+              " should consume the".
+              " 'MooseX::Runnable::Invocation::Plugin::Role::CmdlineArgs'".
+              " role?";
+        }
 
         $plugin->meta->apply(
             $self,

diff --git a/t/invocation-plugin-initargs.t b/t/invocation-plugin-initargs.t
index 376335d..e8f5996 100644 (file)
--- a/t/invocation-plugin-initargs.t
+++ b/t/invocation-plugin-initargs.t
@@ -1,7 +1,7 @@
 use strict;
 use warnings;
 use Test::Exception;
-use Test::More tests => 4;
+use Test::More tests => 6;
 
 use MooseX::Runnable::Invocation;
 
@@ -26,6 +26,10 @@ my $initargs;
   }
 }
 
+{ package Argless;
+  use Moose::Role;
+}
+
 my $i;
 lives_ok {
     $i = MooseX::Runnable::Invocation->new(
@@ -40,5 +44,20 @@ ok $i, 'created invocation ok';
 ok $i->run, 'ran ok';
 is $initargs, 'foo,bar,baz', 'got initargs';
 
+throws_ok {
+    MooseX::Runnable::Invocation->new(
+        class => 'Class',
+        plugins => {
+            '+Argless' => ['args go here'],
+        },
+    );
+} qr/Perhaps/, 'argless + args = error';
 
-
+lives_ok {
+    MooseX::Runnable::Invocation->new(
+        class => 'Class',
+        plugins => {
+            '+Argless' => [],
+        },
+    );
+} 'argless + no args = ok';