Class: MimickIRB

Inherits:
RubyLex
  • Object
show all
Defined in:
lib/shoes/shoes_irb.rb

Defined Under Namespace

Classes: Continue, Empty

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ MimickIRB

Returns a new instance of MimickIRB.



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# File 'lib/shoes/shoes_irb.rb', line 10

def initialize
  super
  $stdout = StringIO.new
  set_input(StringIO.new)
  @started = Time.now
  @history = []
  @echo = true
end

Instance Attribute Details

#echo ⇒ Object

Returns the value of attribute echo.



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# File 'lib/shoes/shoes_irb.rb', line 5

def echo
  @echo
end

#history ⇒ Object

Returns the value of attribute history.



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# File 'lib/shoes/shoes_irb.rb', line 5

def history
  @history
end

#started ⇒ Object

Returns the value of attribute started.



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# File 'lib/shoes/shoes_irb.rb', line 5

def started
  @started
end

Instance Method Details

#run(str) ⇒ Object 



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# File 'lib/shoes/shoes_irb.rb', line 19

def run(str)
  obj = nil
  @io << str
  @io.rewind
  unless l = lex
    raise Empty if @line == ''
  else
    case l.strip
    when "reset"
      @line = ""
    when "time"
      @line = "puts %{This IRB session started #{Time.at(Time.now.getutc - @started.getutc.to_f).strftime('%H:%M:%S')} ago.}"
    when /^echo( (.*))?/
      case $2
      when "on"
         @echo = true
         @line = "puts %{echo is toggled on}"
      when "off"
         @echo = false
         @line = "puts %{echo is toggled off}"
      else
         @line = "puts %{echo is toggled #{@echo ? "on" : "off"}}"
      end
    when "history"
      @line = "puts %{#{@history.join("\n")}}"
    when "save"
      filename = ask_save_file
      if filename
         File.open(filename, "w") { |f| f.write(@history.join("\n")) }
         @line = "puts %{Command history saved to #{filename.inspect}...}"
      else
        @line = ""
      end
    when "help"
      message = <<-END.gsub(/^ {12}/, '')
          help\tdisplay this help.
          echo\techo, echo on and echo off to toggle object output. 
          time\tdisplay time since the IRB session started.
          history\tlist command history.
          save\tsave command history to a file.
          reset\treset terminal.
      END
      @line = "puts \"#{message}\""
    else
      @line << l << "\n"
      if @ltype or @continue or @indent > 0
        raise Continue
      end
    end
  end
  unless @line.empty?
    obj = eval @line, TOPLEVEL_BINDING, "(irb)", @line_no
  end
  @line_no += @line.scan(/\n/).length
  @line = ''
  @exp_line_no = @line_no

  @indent = 0
  @indent_stack = []

  $stdout.rewind
  output = $stdout.read
  $stdout.truncate(0)
  $stdout.rewind
  [output, obj]
rescue Object => e
  case e when Empty, Continue
  else @line = ""
  end
  raise e
ensure
  set_input(StringIO.new)
end