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/environment_command.rb

@@ -0,0 +1,80 @@
+require 'rubygems/command'
+
+class Gem::Commands::EnvironmentCommand < Gem::Command
+
+  def initialize
+    super 'environment', 'Display information about the RubyGems environment'
+  end
+
+  def arguments # :nodoc:
+    args = <<-EOF
+          packageversion  display the package version
+          gemdir          display the path where gems are installed
+          gempath         display path used to search for gems
+          version         display the gem format version
+          remotesources   display the remote gem servers
+          <omitted>       display everything
+    EOF
+    return args.gsub(/^\s+/, '')
+  end
+
+  def usage # :nodoc:
+    "#{program_name} [arg]"
+  end
+
+  def execute
+    out = ''
+    arg = options[:args][0]
+    if begins?("packageversion", arg) then
+      out << Gem::RubyGemsPackageVersion
+    elsif begins?("version", arg) then
+      out << Gem::RubyGemsVersion
+    elsif begins?("gemdir", arg) then
+      out << Gem.dir
+    elsif begins?("gempath", arg) then
+      out << Gem.path.join("\n")
+    elsif begins?("remotesources", arg) then
+      out << Gem.sources.join("\n")
+    elsif arg then
+      fail Gem::CommandLineError, "Unknown enviroment option [#{arg}]"
+    else
+      out = "RubyGems Environment:\n"
+
+      out << "  - RUBYGEMS VERSION: #{Gem::RubyGemsVersion} (#{Gem::RubyGemsPackageVersion})\n"
+
+      out << "  - RUBY VERSION: #{RUBY_VERSION} (#{RUBY_RELEASE_DATE}"
+      out << " patchlevel #{RUBY_PATCHLEVEL}" if defined? RUBY_PATCHLEVEL
+      out << ") [#{RUBY_PLATFORM}]\n"
+
+      out << "  - INSTALLATION DIRECTORY: #{Gem.dir}\n"
+
+      out << "  - RUBYGEMS PREFIX: #{Gem.prefix}\n" unless Gem.prefix.nil?
+
+      out << "  - RUBY EXECUTABLE: #{Gem.ruby}\n"
+
+      out << "  - RUBYGEMS PLATFORMS:\n"
+      Gem.platforms.each do |platform|
+        out << "    - #{platform}\n"
+      end
+
+      out << "  - GEM PATHS:\n"
+      Gem.path.each do |p|
+        out << "     - #{p}\n"
+      end
+
+      out << "  - GEM CONFIGURATION:\n"
+      Gem.configuration.each do |name, value|
+        out << "     - #{name.inspect} => #{value.inspect}\n"
+      end
+
+      out << "  - REMOTE SOURCES:\n"
+      Gem.sources.each do |s|
+        out << "     - #{s}\n"
+      end
+    end
+    say out
+    true
+  end
+
+end
+