Contents

# ==========================================================================
# Project:   Spade - CommonJS Runtime
# Copyright: ©2010 Strobe Inc. All rights reserved.
# License:   Licened under MIT license (see LICENSE)
# ==========================================================================

require 'readline'
require 'fileutils'

# Global object used for the shell.
module Spade
  class Shell

    METHODS = [:to_s, :exit, :quit, :help, :evalrb, :inspectjs]

    def initialize
      @history_path = File.expand_path("~/.spadehistory")
      load_history
    end

    def inject(ctx)
      @ctx = ctx
      METHODS.each{|meth| @ctx[meth.to_s] = method(meth) }
      true
    end

    def to_s
      "[object Shell]"
    end

    def exit(status=0)
      save_history
    ensure
      @ctx.reactor.exit(status)
    end

    alias_method :quit, :exit

    def help(*args)
      <<-HELP
      print(msg)
      print msg to STDOUT

      exit(status = 0)
      exit the shell
      also: quit()

      evalrb(source)
      evaluate some ruby source
      HELP
    end

    def evalrb(str)
      Kernel.eval str, binding
    end

    def inspectjs(obj)
      # check for exact class match so we don't match things like arrays
      spacer = (obj.class == V8::Object) ? 2 : nil
      # the self[] uses the JS version of JSON
      json = @ctx['JSON'].stringify(obj, nil, spacer)
      # Some things can't be converted into json
      json || obj.inspect
    end

    private

      def load_history
        return unless File.exist?(@history_path)
        File.readlines(@history_path).each{|l| Readline::HISTORY << l.chomp }
      end

      def save_history
        FileUtils.mkdir_p(File.dirname(@history_path))
        File.open(@history_path, 'w') do |f|
          Readline::HISTORY.to_a.last(100).each do |l|
            l.chomp!
            next if l.empty?
            next if l =~ /^(exit|quit)\(/
            f.puts l
          end
        end
      end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
spade-0.1.1.1	lib/spade/shell.rb