RBridge was created to make it possible to run Erlang code within the Ruby environment.
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README.txt

rbridge
ruby-mnesia.rubyforge.com
by Toshiyuki Hirooka, Chuck Vose

== DESCRIPTION:

RBridge allows the use of Erlang code within a Ruby program. Optionally allowing
asynchronous access and ruby-like syntax or by using Erlang code directly when
more expressive or complex code is needed.

== FEATURES/PROBLEMS:

* Allows use of Erlang code within Ruby
* Doesn't yet allow Ruby code within Erlang

== SYNOPSIS:

  1. Start an instance of the rulang server by using bin/rulang

  2. Execute your ruby code by connecting (as shown below) to either the RBridge class if you want
  asynchronous access and ruby style code access, or by connecting to the Erlang
  class if you need more complicated code evaluation.

  # load the library
  require 'rbridge'

  # Connect to localhost on port 9900 and using only the erlang module。
  r_erlang = RBridge.new("erlang", "localhost", 9900)

  # This is equivalent to erlang:length([1,2,3,4,5,6,7,8,9]).
  p r_erlang.length([1,2,3,4,5,6,7,8,9])
  # => 9

  # Run Erlang code directly
  a = RBridge.new(nil, "localhost", 9900)
  p a.erl("10*10.")
  # => 100

== REQUIREMENTS:

* Erlang (erlang.org) -
  There are current windows binaries as well as source for other oses. Installing
  on OS X should just need: ./configure --prefix=/opt/local && make && sudo make install.

* Ruby (ruby-lang.org) -
  On the downloads page if you skip past the source downloads there are a lot
  of one-click installers for various oses. If you go with source you at least
  need to install rubygems from rubygems.org.

== INSTALL:

* sudo gem install rbridge

== LICENSE:

RBridge - A Ruby to Erlang bridge allowing the use of Erlang commands within 
normal Ruby code.
Copyright (C) 2008 Toshiyuki Hirooka <toshi.hirooka@gmail.com>, Chuck Vose <vosechu@gmail.com>

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.