From d3631840865ca4ce79d3e7acd33d137e6befef09 Mon Sep 17 00:00:00 2001
From: Jason Garber <jg@jasongarber.com>
Date: Tue, 17 Mar 2009 03:38:25 -0400
Subject: [PATCH] Added a NotCompiledError to give a friendlier message when
 people just unpack RedCloth into their projects. [#131 state:resolved]

---
 CHANGELOG       |  2 ++
 lib/redcloth.rb | 10 +++++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG b/CHANGELOG
index 043a2aa2..f99bf150 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,7 @@
 === Edge
 
+* Added a NotCompiledError to give a friendlier message when people just unpack RedCloth into their projects. [Jason Garber]
+
 * Added a pure-ruby version of the parser for times when you can't compile the C or Java extensions.  You should avoid using it if at all possible because it is 32 times slower (and has some other problems, too)! [Jason Garber]
 
 * Ignore spaces and tabs on blank lines between blocks. #120 [Jason Garber]
diff --git a/lib/redcloth.rb b/lib/redcloth.rb
index d4421039..fc224fc5 100644
--- a/lib/redcloth.rb
+++ b/lib/redcloth.rb
@@ -7,7 +7,15 @@
 # appears to be fixed in Edge Rails [51e4106].
 Object.send(:remove_const, :RedCloth) if Object.const_defined?(:RedCloth) && RedCloth.is_a?(Class)
 
-require 'redcloth_scan'
+module RedCloth
+  class NotCompiledError < LoadError; end
+end
+
+begin
+  require 'redcloth_scan'
+rescue LoadError
+  raise RedCloth::NotCompiledError, "RedCloth is extremely fast but must be compiled first. Installing the RedCloth gem is the easiest method."
+end
 require 'redcloth/version'
 require 'redcloth/textile_doc'
 require 'redcloth/formatters/base'