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#!/usr/local/bin/ruby require 'rubygems' require 'mongrel' # Add the request handler directory to the load path. # Files in the 'app/controllers' dir will be mapped against the first segment # of a URL $LOAD_PATH.unshift( File.join( File.dirname( __FILE__ ) , 'app/controllers' ) ) PORT = 4000 # If true, controller source files are 'load'ed rather than 'require'd # so you can tweak code and reload a page. ALLOW_RELOADING = true class String def import ALLOW_RELOADING ? load( self + '.rb' ) : require( self ) end def controller_class_name self.capitalize end end class MerberHandler < Mongrel::HttpHandler def instantiate_controller(controller_name) controller_name.import begin return Object.const_get( controller_name.controller_class_name ).new rescue Exception # If life is sad, then print the error and re-raise the exception: warn "Error getting instance of '#{controller_name.controller_class_name}': #{$!}" raise $! end end # Grab the request URL and break it up to get the parts that map to the # code request. There's a simple assumption that the first part defines a # class holding the desired code. def handle(request) path = request.params["PATH_INFO"] puts request.inspect puts '='*50 # Might want to consider returning a default object if we have a bare URL. return [nil, nil, nil ] if path =~ /^\/$/ c, m, args = path.to_s.gsub( /^\//, '' ).split( '/' , 3) args = args.to_s.strip.empty? ? nil : args.split( '/' ) # STDERR.puts( "handler_details returning #{h}, #{m}, #{args.inspect} ") # Return an array with our object instance, the method name, and any args. [ instantiate_controller(c), m, args ] end def process(request, response) response.start(200) do |head,out| head["Content-Type"] = "text/html" begin # Looks at the URL and breaks it up into # chunks that map to a class, a method call, # and arguments. # Basically, # /foo/bar/baz/baz # ends up becoming # Foo.new.bar( baz, baz ) controller, method, args = handle(request) if controller # No allowance for default methods. # Worth considering, maybe default to 'index' or 'to_s' out << ( args ? controller.send( method, *args ) : controller.send( method ) ) else out << "<html><body>Error: no merb controller found for this url.</body></html>" end rescue Exception out << "<html>Error! #{$!}</html>" end end end end h = Mongrel::HttpServer.new("0.0.0.0", PORT) h.register("/", MerberHandler.new) h.register("/", Mongrel::DirHandler.new("assets")) h.run.join --merb.rb--- require 'erb' class Merb # Define a class variable to track the default location of the template # files. @@template_dir = File.expand_path( ( File.dirname( __FILE__ ) + "/../views/merb" ) ) def hello(*names) # Assign the parameter to an instance variable @name = names.join(', ') template = ERB.new( IO.read( @@template_dir + '/hello.rhtml' ) ) template.result( binding ) end end --hello.rhtml-- <html> <head> <title>Hello, <%= @name %></title> </head> <body> <h1>Hello, <%= @name %>!</h1> </body> </html>

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