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@@ -1,9 +1,115 @@
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 #!/usr/bin/env ruby
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 PASSENGER_ROOT = File.expand_path(File.dirname(__FILE__) << "/..")
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-PASSENGER_WEBSITE = "http://passenger.phusion.nl/"
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-PHUSION_WEBSITE = "www.phusion.nl"
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 $LOAD_PATH.unshift("#{PASSENGER_ROOT}/lib")
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 require 'passenger/platform_info'
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+require 'passenger/dependencies'
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+require 'passenger/console_text_template'
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+include Passenger
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+include PlatformInfo
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+
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+class Installer
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+	REQUIRED_DEPENDENCIES = [
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+		Dependencies::Ruby_DevHeaders,
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+		Dependencies::RubyGems,
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+		Dependencies::Rake,
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+		Dependencies::Apache2,
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+		Dependencies::Apache2_DevHeaders,
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+		Dependencies::APR_DevHeaders
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+	]
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+	
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+	def start
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+		check_dependencies
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+	ensure
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+		reset_terminal_colors
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+	end
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+
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+	def init_terminal_colors
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+		STDOUT.write("\e[0m\e[37m\e[40m")
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+		STDOUT.flush
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+	end
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+	
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+	def reset_terminal_colors
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+		STDOUT.write("\e[0m")
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+		STDOUT.flush
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+	end
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+
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+	def check_dependencies
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+		missing_dependencies = []
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+		color_puts "<banner>Checking for required software...</banner>"
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+		puts
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+		REQUIRED_DEPENDENCIES.each do |dep|
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+			color_print " * #{dep.name}... "
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+			result = dep.check
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+			if result.found?
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+				if result.found_at
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+					color_puts "<green>found at #{result.found_at}</green>"
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+				else
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+					color_puts "<green>found</green>"
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+				end
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+			else
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+				color_puts "<red>not found</red>"
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+				missing_dependencies << dep
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+			end
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+		end
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+		
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+		missing_dependencies = REQUIRED_DEPENDENCIES
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+		if !missing_dependencies.empty?
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+			puts
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+			color_puts "<red>Some required software is not installed.</red>"
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+			color_puts "But don't worry, this installer will tell you how to install them.\n"
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+			color_puts "<b>Press Enter to continue, or Ctrl-C to abort.</b>"
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+			wait
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+			
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+			line
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+			color_puts "<banner>Installation instructions for required software</banner>"
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+			puts
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+			missing_dependencies.each do |dep|
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+				color_puts " * To install <yellow>#{dep.name}</yellow>:"
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+				if !dep.install_command.nil?
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+					color_puts "   Please run <b>#{dep.install_command}</b> as root."
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+				elsif !dep.install_instructions.nil?
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+					color_puts "   " << dep.install_instructions
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+				elsif !dep.website.nil?
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+					color_puts "   Please download it from <b>#{dep.website}</b>"
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+				else
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+					color_puts "   Search Google."
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+				end
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+				puts
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+			end
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+		end
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+	end
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+
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+private
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+	def color_print(text)
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+		STDOUT.write(ConsoleTextTemplate.new(:text => text).result)
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+		STDOUT.flush
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+	end
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+	
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+	def color_puts(text)
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+		color_print("#{text}\n")
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+	end
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+	
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+	def line
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+		puts "--------------------------------------------"
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+	end
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+	
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+	def wait
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+		begin
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+			STDIN.readline
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+		rescue Interrupt
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+			exit 2
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+		end
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+	end
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+end
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+
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+Installer.new.start
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+exit
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+
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+
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+PASSENGER_WEBSITE = "http://passenger.phusion.nl/"
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+PHUSION_WEBSITE = "www.phusion.nl"
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+
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+
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 Dir.chdir(PASSENGER_ROOT)
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 include PlatformInfo
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@@ -18,17 +18,6 @@ private
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   def self.env_defined?(name)
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     return !ENV[name].nil? && !ENV[name]
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   end
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-	
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-	def self.find_command(name)
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-		# system('which') is not compatible across Linux and BSD
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-		ENV['PATH'].split(File::PATH_SEPARATOR).detect do |directory|
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-			path = File.join(directory, name.to_s)
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-			if File.executable?(path)
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-				return path
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-			end
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-		end
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-		return nil
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-	end
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   def self.find_apxs2
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     if env_defined?("APXS2")
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@@ -80,6 +69,12 @@ private
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   def self.find_httpd
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     if APXS2.nil?
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+			["apache2", "httpd2", "apache", "httpd"].each do |name|
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+				command = find_command(name)
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+				if !command.nil?
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+					return command
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+				end
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+			end
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       return nil
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     else
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       return find_apache2_executable(`#{APXS2} -q TARGET`.strip)
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@@ -134,8 +129,53 @@ private
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       return "so"
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     end
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   end
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+	
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+	def self.read_file(filename)
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+		return File.read(filename)
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+	rescue
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+		return ""
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+	end
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+	
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+	def self.determine_linux_distro
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+		if RUBY_PLATFORM !~ /linux/
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+			return nil
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+		end
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+		lsb_release = read_file("/etc/lsb-release")
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+		if lsb_release =~ /Ubuntu/
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+			return :ubuntu
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+		elsif File.exist?("/etc/debian_version")
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+			return :debian
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+		elsif File.exist?("/etc/redhat-release")
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+			redhat_release = read_file("/etc/redhat-release")
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+			if redhat_release =~ /CentOS/
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+				return :centos
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+			elsif redhat_release =~ /Fedora/  # is this correct?
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+				return :fedora
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+			else
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+				return :rhel
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+			end
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+		elsif File.exist?("/etc/suse-release")
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+			return :suse
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+		elsif File.exist?("/etc/gentoo-release")
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+			return :gentoo
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+		else
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+			return :unknown
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+		end
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+		# TODO: Slackware, Mandrake/Mandriva
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+	end
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 public
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+	def self.find_command(name)
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+		# system('which') is not compatible across Linux and BSD
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+		ENV['PATH'].split(File::PATH_SEPARATOR).detect do |directory|
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+			path = File.join(directory, name.to_s)
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+			if File.executable?(path)
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+				return path
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+			end
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+		end
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+		return nil
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+	end
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+
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   # The absolute path to the current Ruby interpreter.
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   RUBY = Config::CONFIG['bindir'] + '/' + Config::CONFIG['RUBY_INSTALL_NAME']
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@@ -159,4 +199,6 @@ public
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   MULTI_ARCH_FLAGS = determine_multi_arch_flags
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   # The current platform's shared library extension ('so' on most Unices).
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   LIBEXT = determine_library_extension
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+	# An identifier for the current Linux distribution. nil if the operating system is not Linux.
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+	LINUX_DISTRO = determine_linux_distro
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 end