Added time sort option for list command

lib/rubygems/commands/list_command.rb

@@ -9,6 +9,10 @@ class Gem::Commands::ListCommand < Gem::Commands::QueryCommand
 
   def initialize
     super 'list', 'Display gems whose name starts with STRING'
+
+    add_option('-t', '--time', 'Sort gem(s) according to latest version release') do |value, options|
+      options[:time] = value
+    end
 
     remove_option('--name-matches')
   end

lib/rubygems/commands/query_command.rb

@@ -162,9 +162,12 @@ def output_query_results(spec_tuples)
     spec_tuples.each do |spec_tuple, source|
       versions[spec_tuple.name] << [spec_tuple, source]
     end
-
-    versions = versions.sort_by do |(n,_),_|
-      n.downcase
+    versions = versions.sort_by do |(n,_), tuples|
+      if options[:time]
+        [tuples.first[1].date, n.downcase]
+      else
+        n.downcase
+      end
     end
 
     output_versions output, versions
@@ -210,6 +213,7 @@ def entry_details entry, detail_tuple, specs, platforms
     spec_authors     entry, spec
     spec_homepage    entry, spec
     spec_license     entry, spec
+    spec_date        entry, spec
     spec_loaded_from entry, spec, specs
     spec_summary     entry, spec
   end
@@ -261,6 +265,12 @@ def spec_homepage entry, spec
 
     entry << "\n" << format_text("Homepage: #{spec.homepage}", 68, 4)
   end
+
+  def spec_date entry, spec
+    return if spec.date.nil?
+
+    entry << "\n" << format_text("Date: #{spec.date.strftime('%b %d, %Y')}", 68, 4)
+  end
 
   def spec_license entry, spec
     return if spec.license.nil? or spec.license.empty?