#!/usr/bin/env ruby

Thread.abort_on_exception = true

class Starter
  attr_accessor :handler

  def start
    @server = TCPServer.new(4254)
    loop do
      Thread.start(@server.accept) do |socket|
        puts "Got connection"
        while line = socket.gets.chomp
          @handler.dup.handle(socket, line) # I have to dup it, because it changes some
                                            # instance variables for use in the block
        end
      end
    end
  end
end

class Handler
  def initialize(&block)
    @procedure = block
  end

  def handle(socket, line)
    @line = line
    @socket = socket
    instance_eval(&@procedure) # This seems a bit hackish. I just want the method
                               # `write` to be directly available in the block
  end

  def write(line) # This is the method called from within the block
    @socket.write line.to_s + "\n"
  end
end

s = Starter.new
s.handler = Handler.new do # The syntax here is the only thing set I'm actively aiming for. I don't want to write stuff  like Handler.new do |socket,line| socket.write line + "\n" end. I'd prefer passing the line as an argument, though
  puts "Got: #{@line}"
  write "Hi, #@line. Wanna race?\n"
  sleep 5
  write "You're still here intact, #@line! :D\n"
end

puts "Starting server ..."
s.start

## What I want
s = Starter.new
s.handler = Handler.new do |line| # or some other way to get the line (this will be broken up into keywords and arguments)
  if line == "foobar"
    write "You wrote foobar! I love you <3"
  else
    write "Don't you love me anymore ... ?"
  end
end