Module: SpinalTap::ClientHelpers

Defined in:
lib/spinal_tap/client_helpers.rb

Instance Method Summary collapse

Instance Method Details

#bell ⇒ Object 



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# File 'lib/spinal_tap/client_helpers.rb', line 134

def bell
  write([7].pack('C'))
end

#exception_to_s(e) ⇒ Object 



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# File 'lib/spinal_tap/client_helpers.rb', line 180

def exception_to_s(e)
  "#{e.message}\r\n#{e.backtrace.join("\r\n")}"
end

#exec_counts ⇒ Object 



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# File 'lib/spinal_tap/client_helpers.rb', line 165

def exec_counts
  GC.start

  results = {}

  ObjectSpace.each_object() do |o|
    results[o.class] ||= 0
    results[o.class] += 1
  end

  results = results.sort { |a, b|  a[1] <=> b[1] }

  results.each { |e| write("#{e[0]}: #{e[1]}\r\n") }
end

#exec_eval(code) ⇒ Object 



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# File 'lib/spinal_tap/client_helpers.rb', line 156

def exec_eval(code)
  begin
    result = eval(code, @binding)
    write("=> #{result.to_s}\r\n")
  rescue Exception => e
    write(exception_to_s(e))
  end
end

#exec_help ⇒ Object 



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# File 'lib/spinal_tap/client_helpers.rb', line 142

def exec_help
  write("Commands:\r\n")
  write("  help   - display help information.\r\n")
  write("  quit   - quit this session.\r\n")
  write("  eval   - execute ruby code.\r\n")
  write("  counts - display object counts.\r\n")
end

#exec_history ⇒ Object 



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# File 'lib/spinal_tap/client_helpers.rb', line 150

def exec_history
  @history.all.each_with_index do |entry, index|
    write("#{index.to_s.ljust(4, ' ')} #{entry}\r\n")
  end
end

#process_loop ⇒ Object 



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# File 'lib/spinal_tap/client_helpers.rb', line 27

def process_loop
  while (line = read_parsed_line)
    command = line[:command]
    args = line[:args]

    case command
    when 'help' then exec_help
    when 'history' then exec_history
    when 'eval' then exec_eval(args.join(' '))
    when 'counts' then exec_counts
    when 'quit'
      close
      break
    else
      write("Unknown command\r\n")
    end
  end
ensure
  close unless closed?
  @server.unregister(Thread.current)
end

#read_parsed_line ⇒ Object 



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# File 'lib/spinal_tap/client_helpers.rb', line 54

def read_parsed_line
  reset_cmd_line
  redraw_cmd_line

  while byte = getbyte
    byte_s = '' << byte

    # Delete Char.
    if byte == 127
      if @buffer.length > 0 && @cursor_pos > 1
        @cursor_pos -= 1
        @buffer.slice!(@cursor_pos - 1)
      else
        bell
      end

    # Null Char.
    elsif byte == 0
      next

    # Escape Char.
    elsif byte == 27
      if (byte = getbyte) == 91 # [ Char.
        case getbyte
        when 65 # A Char - Up Arrow.
          if (result = @history.previous)
            @buffer = result
            @cursor_pos = @buffer.length + 1
          else
            bell
          end
        when 66 # B Char - Down Arrow.
          if (result = @history.next)
            @buffer = result
            @cursor_pos = @buffer.length + 1
          else
            bell
          end
        when 67 # C Char - Right Arrow.
          if @cursor_pos < @buffer.length + 1
            @cursor_pos += 1
          else
            bell
          end
        when 68 # D Char - Left Arrow.
          if @cursor_pos > 0 + 1
            @cursor_pos -= 1
          else
            bell
          end
        end
      end

    # Carriage Return Char.
    elsif byte == 13
      write("\r\n")

      tokens = @buffer.split(' ')
      command = tokens.first
      args = tokens[1..-1]

      if @buffer.length > 0
        @history.append(@buffer)
      end

      return {:command => command, :args => args}

    # Normal (letters, numbers, punctuation, etc) Chars.
    elsif byte >= 32 && byte <= 126
      @buffer.insert(@cursor_pos - 1, byte_s)
      @cursor_pos += 1

    # Ignore all other special characters.
    else
    end

    redraw_cmd_line
  end
end

#redraw_cmd_line ⇒ Object 



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# File 'lib/spinal_tap/client_helpers.rb', line 138

def redraw_cmd_line
  write("\e[2K\r>\e[s #{@buffer}\e[u\e[#{@cursor_pos}C")
end

#reset_cmd_line ⇒ Object 



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# File 'lib/spinal_tap/client_helpers.rb', line 49

def reset_cmd_line
  @buffer = @history.current
  @cursor_pos = 1
end

#setup(server) ⇒ Object 



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# File 'lib/spinal_tap/client_helpers.rb', line 9

def setup(server)
  @server = server
  @history = SpinalTap::History.new
  @binding = SpinalTap::BindingWrapper.new.binding

  reset_cmd_line

  setsockopt(Socket::IPPROTO_TCP, Socket::TCP_NODELAY, 1)

  suppress_go_ahead = [255, 251, 3].pack('C3')
  write(suppress_go_ahead)

  echo = [255, 251, 1].pack('C3')
  write(echo)

  6.times { getc }
end