gistfile1.rb

class WhatsGoingOn
	def initialize(io)
		@io = io
	end
	
	def analyze
		require 'rbconfig'
		require 'rubygems'
		print('Ruby exe', ruby_exe)
		print('Ruby version', RUBY_VERSION)
		print('Ruby platform', RUBY_PLATFORM)
		print('Ruby engine', ruby_engine)
		print('RubyGems version', Gem::VERSION)
		print('uname -a', `uname -a`.strip)
		print('UID', Process.uid)
		print('GID', Process.gid)
		print_env('PATH')
		print_env('LD_LIBRARY_PATH')
		print_env('RUBYOPT')
		print_hash('Config', RbConfig::CONFIG)
		print_hash('Environment', ENV)
		print_list('$LOAD_PATH', $LOAD_PATH)
		print_list('$LOADED_FEATURES', $LOADED_FEATURES)
		return self
	end
	
	def flush
		@io.flush
	end

private
	def print(name, value)
		@io.printf "%-18s %s\n", name, value.nil? ? "nil" : value
	end
	
	def print_env(env)
		print(env, ENV[env])
	end
	
	def print_list(name, list)
		@io.puts("#{name} (#{list.size} items)")
		list.each do |item|
			@io.puts "   #{item}"
		end
	end
	
	def print_hash(name, hash)
		@io.puts("#{name} (#{hash.size} items)")
		hash.sort.each do |key, value|
			@io.printf "   %-20s => %s\n", key.inspect, value.inspect
		end
	end
	
	def ruby_exe
		return RbConfig::CONFIG['bindir'] + '/' +
			RbConfig::CONFIG['RUBY_INSTALL_NAME'] +
			RbConfig::CONFIG['EXEEXT']
	end
	
	def ruby_engine
		if defined?(RUBY_ENGINE)
			return RUBY_ENGINE
		else
			return "ruby"
		end
	end
end

require 'stringio'
WhatsGoingOn.new(STDERR).analyze.flush