Added a NotCompiledError to give a friendlier message when people jus…

…t unpack RedCloth into their projects. [#131 state:resolved]

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]

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'