From cbacc0ce3040f942a6f000e522018de8fc1a9d62 Mon Sep 17 00:00:00 2001
From: Eric Davis <edavis@littlestreamsoftware.com>
Date: Sun, 31 Oct 2010 23:56:31 +0000
Subject: [PATCH] Merged r4293 from trunk.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/branches/1.0-stable@4331 e93f8b46-1217-0410-a6f0-8f06a7374b81
---
 lib/redmine/plugin.rb | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/redmine/plugin.rb b/lib/redmine/plugin.rb
index 11255e02d..f30277ad1 100644
--- a/lib/redmine/plugin.rb
+++ b/lib/redmine/plugin.rb
@@ -89,6 +89,13 @@ module Redmine #:nodoc:
     def self.clear
       @registered_plugins = {}
     end
+
+    # Checks if a plugin is installed
+    #
+    # @param [String] id name of the plugin
+    def self.installed?(id)
+      registered_plugins[id.to_sym].present?
+    end
     
     def initialize(id)
       @id = id.to_sym