Class: Rubic::Rubic

Inherits:
Object
  • Object
show all
Defined in:
lib/rubic.rb

Overview

The REPL itself

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Rubic

Returns a new instance of Rubic.



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# File 'lib/rubic.rb', line 82

def initialize
  @workspace = IRB::WorkSpace.new(TOPLEVEL_BINDING.dup)
  @lines = LineGroup.new
end

Instance Method Details

#eval_forever ⇒ Object 



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# File 'lib/rubic.rb', line 87

def eval_forever
  # so we can reset settings after
  # todo need to put more in here (maybe? IRB doesn't...)
  history_len = Reline::HISTORY.size
  og_completion_proc = Reline.completion_proc
  og_autocompletion = Reline.autocompletion

  Reline.completion_proc = lambda { |target, preposting, postposting|
    completion(target, preposting, postposting)
  }

  Reline.autocompletion = true
  Reline.completer_quote_characters = ""
  Reline.output_modifier_proc = proc do |input, complete:|
    output_modifier(input, complete)
  end

  loop do
    line = Reline.readline("> ")
    break if line.nil?

    Reline::HISTORY.push(line) if line.strip != ""

    cmd, args = line.split(" ", 2)
    case cmd
    when "list"
      @lines.lines.each do |line_num, line|
        puts output_modifier("#{line_num} #{line}", false)
      end
    when "run"
      run(@lines.stringify(false))
    when "clear"
      @lines.clear
    when "load"
      if args.nil? || args.empty?
        puts "Usage: load filename.rub"
      else
        @lines.load(args, true)
      end
    when "save"
      if args.nil? || args.empty?
        puts "Usage: save filename.rub"
      else
        @lines.save(args, true)
      end
    when "import"
      if args.nil? || args.empty?
        puts "Usage: import filename.rb"
      else
        @lines.load(args, false)
      end
    when "export"
      if args.nil? || args.empty?
        puts "Usage: export filename.rb"
      else
        @lines.save(args, false)
      end
    when "squish"
      @lines.resize(1)
    when "widen"
      @lines.resize(10)
    when "help"
      print_help
    when "exit", "bye"
      break
    else
      line_num, expr = line.split(" ", 2)
      line_num = begin
        Integer(line_num)
      rescue StandardError
        nil
      end

      if line_num.nil?
        run(line) if line != ""
      else
        @lines.update(line_num, expr)
      end
    end
  rescue Interrupt
    puts "^C"
  end

  # so that the shell is put on a new line
  # if we exit with ctrl+d
  puts
ensure
  # reset history
  delta = Reline::HISTORY.size - history_len
  (0...delta).each do
    Reline::HISTORY.pop
  end

  Reline.completion_proc = og_completion_proc
  Reline.autocompletion = og_autocompletion
end