Added Rails::Info to catalog assorted information about a Rails application's environment

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2882 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

railties/CHANGELOG

 *SVN*
 
+* Added Rails::Info to catalog assorted information about a Rails application's environment [Sam Stephenson]
+
 * Tail the logfile when running script/lighttpd in the foreground [Sam Stephenson]
 
 * Try to guess the port number from config/lighttpd.conf in script/lighttpd [Sam Stephenson]

railties/lib/info.rb

+module Rails
+  module Info
+    mattr_accessor :properties
+    @@properties = []
+  
+    class << self #:nodoc:
+      def property(name, value = nil)
+        value ||= yield
+        properties << [name, value] if value 
+      rescue Exception
+      end
+
+      def components
+        %w(active_record action_pack action_web_service 
+           action_mailer active_support)
+      end
+      
+      def component_version(component)
+        require "#{component}/version"
+        "#{component.classify}::Version::STRING".constantize
+      end
+      
+      def edge_rails_revision
+        svn_info[/^Revision: (\d+)/, 1] || 'unknown'
+      end
+      
+    protected
+      def svn_info
+        Dir.chdir("#{RAILS_ROOT}/vendor/rails") do
+          IO.popen('svn info') { |f| f.read }
+        end
+      end
+    end
+
+    # The Ruby version and platform, e.g. "1.8.2 (powerpc-darwin8.2.0)".
+    property 'Ruby version', "#{RUBY_VERSION} (#{RUBY_PLATFORM})"
+
+    # The RubyGems version, if it's installed.
+    property 'RubyGems version' do
+      Gem::RubyGemsVersion
+    end
+  
+    # Versions of each Rails component (Active Record, Action Pack, 
+    # Action Web Service, Action Mailer, and Active Support).
+    components.each do |component|
+      property "#{component.titlecase} version" do 
+        component_version(component)
+      end
+    end
+  
+    # The Rails SVN revision, if it's checked out into vendor/rails.
+    property 'Edge Rails revision' do
+      edge_rails_revision
+    end
+  
+    # The current Rails environment (development, test, or production).
+    property 'Environment' do
+      RAILS_ENV
+    end
+    
+    # The name of the database adapter for the current environment.
+    property 'Database adapter' do
+      ActiveRecord::Base.configurations[RAILS_ENV]['adapter']
+    end
+  end
+end

railties/test/info_test.rb

+$:.unshift File.dirname(__FILE__) + "/../lib"
+$:.unshift File.dirname(__FILE__) + "/../../activesupport/lib"
+
+require 'test/unit'
+require 'active_support'
+require 'info'
+
+class << Rails::Info
+protected
+  def svn_info
+    <<-EOS
+Path: .
+URL: http://www.rubyonrails.com/svn/rails/trunk
+Repository UUID: 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
+Revision: 2881
+Node Kind: directory
+Schedule: normal
+Last Changed Author: sam
+Last Changed Rev: 2881
+Last Changed Date: 2005-11-04 21:04:41 -0600 (Fri, 04 Nov 2005)
+Properties Last Updated: 2005-10-28 19:30:00 -0500 (Fri, 28 Oct 2005)
+
+    EOS
+  end
+end
+
+class InfoTest < Test::Unit::TestCase
+  def test_edge_rails_revision_extracted_from_svn_info
+    assert_equal '2881', Rails::Info.edge_rails_revision
+  end
+  
+  def test_property_with_block_swallows_exceptions_and_ignores_property
+    assert_nothing_raised do
+      Rails::Info.module_eval do
+        property('Bogus') {raise}
+      end
+    end
+    assert !property_defined?('Bogus')
+  end
+  
+  def test_property_with_string
+    Rails::Info.module_eval do
+      property 'Hello', 'World'
+    end
+    assert_property 'Hello', 'World'
+  end
+  
+  def test_property_with_block
+    Rails::Info.module_eval do
+      property('Goodbye') {'World'}
+    end
+    assert_property 'Goodbye', 'World'
+  end
+  
+  def test_component_version
+    assert_property 'Active Support version', ActiveSupport::Version::STRING
+  end
+
+protected
+  def property_names
+    Rails::Info.properties.map {|(name, )| name}
+  end
+  
+  def property_value(property_name)
+    Rails::Info.properties.find {|(name, )| property_name == name}.last
+  end
+  
+  def property_defined?(property_name)
+    property_names.include? property_name
+  end
+  
+  def assert_property(property_name, value)
+    raise "Property #{property_name.inspect} not defined" unless 
+      property_defined? property_name
+    assert_equal value, property_value(property_name)
+  end
+end
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