class Opal::Environment::FS

runtime.
writing, etc. FS plays an intermediate role betweeen opal and the ruby
Server side opal aims to offer much of what Ruby offers.. reading and
access/dir access simply to support require(), Dir.glob() and File.join().
File system access. The browser build of opal has simple methods of FS

def getwd 

def getwd
  proc do
    Dir.getwd
  end
end

def glob 

def glob
  proc do |glob|
    Dir.glob(glob)
  end
end

def initialize(env) 

def initialize(env)
  super
  # a hash of required files - filename => true????? er,, why not array?
  @required_files = {}
  self['require'] = require
  self['getwd'] = getwd
  
  setup_load_paths
end

def require

Require function from opal 
def require        
  proc do |path|
    # no extension? add .rb
    path = "#{path}.rb" unless /.*\.(rb|js)$/.match(path)
    # puts "need to require: #{path}"
    file_path = nil
    @load_paths.each do |load_path|
      proposed = File.join load_path, path
      # puts "trying: #{propos/ed}"
      if File.exist? proposed
        file_path = proposed
        unless @required_files[file_path]
          @required_files[file_path] = true
          @environment.load_required_file file_path
        end
        break
      end
    end
    return true if file_path
    false
  end
end

def setup_load_paths

Set up load paths.. basically add all our opals into the load path 
def setup_load_paths
  @load_paths = []
  %w{spec}.each do |opal|
    @load_paths << File.join(OPALS_PATH, 'opal', opal, 'lib')
  end
  # current dir is also in the load path..
  @load_paths << Dir.getwd
  @load_paths << ""
end