working prototype

server.rb

@@ -0,0 +1,79 @@
+#!/usr/bin/env ruby
+
+require 'socket'
+
+PORT = 6789
+ROWS = 24
+COLS = 40
+VERSION = 0.01
+
+server = TCPServer.new(PORT)
+sockets = [server]
+
+puts "PORT: #{PORT}"
+puts 'Listening...'
+
+buffer = ' '*ROWS*COLS
+cont = 0
+
+def new_buf_cont_out(buf, count, newtext)
+  buf = buf.dup
+  out = ''
+  nti = 0 # New Text Index
+  while nti < newtext.length
+    out << "#{VERSION}|"
+    out << ((count/COLS)+1).to_s + '|'
+    out << ((count%COLS)+1).to_s + '|'
+    loop do
+      out << newtext[nti]
+      buf[count] = newtext[nti]
+      count += 1
+      nti += 1
+      break if nti >= newtext.length
+      break if count%COLS == 0
+    end
+    count = 0 if count >= (ROWS*COLS)
+    out << "\n"
+  end
+  return [buf, count, out]
+end
+
+loop do
+  ready, = IO.select(sockets)
+  newtext = ''
+
+  ready.each do |sck|
+    if sck == server
+      client = server.accept
+      sockets << client
+      puts "Connection: #{client.peeraddr}"
+      client.puts new_buf_cont_out(buffer,0,buffer)[2]
+      client.puts new_buf_cont_out(buffer,cont-1,'')[2]
+      next
+    end
+    begin
+
+      msg = sck.gets
+      unless msg
+        puts "Disconnect: #{sck.peeraddr}"
+        sck.close
+        sockets.delete(sck)
+        next
+      end
+      ver, msg = msg.chomp.split('|',2)
+      next unless ver.to_f <= VERSION
+      next unless msg != nil
+      newtext << msg
+    rescue Errno::ECONNRESET, Errno::EPIPE
+      puts "Disconnect (err): #{sck.peeraddr}"
+      sck.close
+      sockets.delete(sck)
+    end
+    buffer, cont, out = new_buf_cont_out(buffer,cont,newtext)
+    clients = sockets - [server]
+    clients.each { |c| c.puts out }
+    #if out != ''
+    #  puts "#{cont}: (#{(cont/COLS)+1},#{(cont%COLS)+1})"
+    #end
+  end
+end