Import RubyGems trunk revision 1493.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@13862 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rubygems/commands/list_command.rb

@@ -0,0 +1,35 @@
+require 'rubygems/command'
+require 'rubygems/commands/query_command'
+
+module Gem
+  module Commands
+    class ListCommand < QueryCommand
+
+      def initialize
+        super(
+          'list',
+          'Display all gems whose name starts with STRING'
+        )
+        remove_option('--name-matches')
+      end
+
+      def arguments # :nodoc:
+        "STRING        start of gem name to look for"
+      end
+
+      def defaults_str # :nodoc:
+        "--local --no-details"
+      end
+
+      def usage # :nodoc:
+        "#{program_name} [STRING]"
+      end
+
+      def execute
+        string = get_one_optional_argument || ''
+        options[:name] = /^#{string}/i
+        super
+      end
+    end
+  end
+end