#!/usr/bin/env ruby
# scripts/Makefiles can read and eval the output of this script and
# use it as RUBYLIB
require 'rubygems'
require 'isolate'
fp = File.open(__FILE__, "rb")
fp.flock(File::LOCK_EX)

ruby_engine = defined?(RUBY_ENGINE) ? RUBY_ENGINE : 'ruby'
opts = {
  :system => false,
  # we want "ruby-1.8.7" and not "ruby-1.8", so disable :multiruby
  :multiruby => false,
  :path => "tmp/isolate/#{ruby_engine}-#{RUBY_VERSION}",
}

pid = fork do
  Isolate.now!(opts) do
    gem 'sqlite3-ruby', '1.2.5'
    gem 'kgio', '2.0.0'
    gem 'rack', '1.1.0'
  end
end
_, status = Process.waitpid2(pid)
status.success? or abort status.inspect
lib_paths = Dir["#{opts[:path]}/gems/*-*/lib"].map { |x| File.expand_path(x) }
dst = "tmp/isolate/#{ruby_engine}-#{RUBY_VERSION}.mk"
File.open("#{dst}.#$$", "w") do |fp|
  fp.puts "ISOLATE_LIBS=#{lib_paths.join(':')}"
end
File.rename("#{dst}.#$$", dst)

# pure Ruby gems can be shared across all Rubies
%w(3.0.0).each do |rails_ver|
  opts[:path] = "tmp/isolate/rails-#{rails_ver}"
  pid = fork do
    Isolate.now!(opts) do
      gem 'rails', rails_ver
    end
  end
  _, status = Process.waitpid2(pid)
  status.success? or abort status.inspect
  more = Dir["#{opts[:path]}/gems/*-*/lib"].map { |x| File.expand_path(x) }
  lib_paths.concat(more)
end