* ext/digest/lib/digest.rb (Digest): Try to auto-load non-standard

  digest modules when a specified digest class is missing.

* ext/digest/lib/digest.rb: Define Digest(name) for ease of
  dynamically selecting a hashing algorithm.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@11155 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 15 insertions, 3 deletions

diff --git a/ext/digest/lib/digest.rb b/ext/digest/lib/digest.rb
index c277a0eea5..dc91e9444e 100644
--- a/ext/digest/lib/digest.rb
+++ b/ext/digest/lib/digest.rb
@@ -1,13 +1,21 @@
 require 'digest.so'
 
 module Digest
-  autoload "MD5", "digest/md5"
-  autoload "RMD160", "digest/rmd160"
-  autoload "SHA1", "digest/sha1"
   autoload "SHA256", "digest/sha2"
   autoload "SHA384", "digest/sha2"
   autoload "SHA512", "digest/sha2"
 
+  def self.const_missing(name)
+    begin
+      require File.join('digest', name.downcase)
+
+      return Digest.const_get(name) if Digest.const_defined?(name)
+    rescue LoadError => e
+    end
+
+    raise NameError, "Digest class not found: Digest::#{name}"
+  end
+
   class Base
     # creates a digest object and read given file, _name_.
     # 
@@ -25,3 +33,7 @@ module Digest
     end
   end
 end
+
+def Digest(name)
+  Digest.const_get(name)
+end