Class: RCL::Shell

Inherits:
Base show all
Defined in:
lib/rcl/shell.rb

Defined Under Namespace

Classes: Command

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Base

#access, #create, #dump, #modify, #update_access, #update_modify

Constructor Details

#initialize(processor, banner, prompt = DefaultPrompt) ⇒ Shell

Returns a new instance of Shell.

Raises:

  • (ArgumentError) 


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# File 'lib/rcl/shell.rb', line 15

def initialize(processor, banner, prompt=DefaultPrompt)
  raise ArgumentError, 'nil processor' if processor.nil?
  raise ArgumentError, 'invalid processor class' \
    if processor.class != Symbol
  if !banner.nil?
    raise ArgumentError, 'invalid banner class' if banner.class != Symbol
  end
  raise ArgumentError, 'nil prompt' if prompt.nil?
  raise ArgumentError, 'invalid prompt class' if prompt.class != String

  @banner = banner
  @process = processor
  @commands = {}
  @prompt = (prompt[prompt.length-1].chr != ' ') ? "#{prompt} " : prompt
  @history = []

  nil
end

Instance Attribute Details

#history ⇒ Object (readonly)

Returns the value of attribute history.



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# File 'lib/rcl/shell.rb', line 11

def history
  @history
end

#prompt ⇒ Object

Returns the value of attribute prompt.



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# File 'lib/rcl/shell.rb', line 10

def prompt
  @prompt
end

Instance Method Details

#register(command, *args) ⇒ Object

TODO: Shell#register needs love

Raises:

  • (ArgumentError) 


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# File 'lib/rcl/shell.rb', line 35

def register(command, *args)
  raise ArgumentError, 'nil command' if command.nil?
  raise ArgumentError, 'invalid command class' if command.class != String
  raise ArgumentError, 'empty command' if command.empty?
  if !args.nil?
    raise ArgumentError, 'invalid args class' if args.class != Array
    raise ArgumentError, 'empty args' if args.empty?
    args.each do |arg|
      raise ArgumentError, 'nil arg' if arg.nil?
      raise ArgumentError, 'invalid arg class' if arg.class != String
      raise ArgumentError, 'empty arg' if arg.empty?
    end
  end

  @commands[command] = args

  nil
end

#run(*args) ⇒ Object 



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# File 'lib/rcl/shell.rb', line 67

def run(*args)
  if !@banner.nil?
    send(@banner)
    puts
  end

  loop do
    buffer = Readline::readline(@prompt, true)
    break if buffer.nil?
    buffer.chomp!
    next if buffer.nil?
    buffer.strip!

    # double bang repeatsw last command
    if buffer =~ /^!!$/
      if !@history.last.nil?
        @history << Command.new(@history.last.command, Time.now)
        exec(@history.last.command)
      else
        puts '!!: event not found'
      end
      next
    end

    # repeat specified command from history buffer
    if buffer =~ /^!(\-)?(\d*)$/
      if $1.nil?
        # forward bang history
        pos = $2.to_i-1
        if pos < 0 || pos > @history.size-1
          puts "#{buffer}: event not found"
          next
        else
          if !@history[pos].command.nil?
            @history << Command.new(@history[pos].command, Time.now)
            exec(@history[pos].command)
          end
        end
      else
        # reverse bang history
        pos = $2.to_i-1
        if pos < 0 || pos > @history.size-1
          puts "#{buffer}: event not found"
          next
        else
          if !@history[pos].command.nil?
            @history << Command.new(@history[-pos].command, Time.now)
            exec(@history[-(pos+1)].command)
          end
        end
      end
      next
    end

    next if buffer.empty?

    @history << Command.new(buffer, Time.now)
    exec(buffer)
  end

  puts
end

#unregister(command) ⇒ Object

TODO: Shell#unregister needs love

Raises:

  • (ArgumentError) 


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# File 'lib/rcl/shell.rb', line 55

def unregister(command)
  raise ArgumentError, 'nil command' if command.nil?
  raise ArgumentError, 'invalid command class' if command.class != String
  raise ArgumentError, 'empty command' if command.empty?

  if @commands.has_key?(command)
    return @commands.delete(command)
  end

  nil
end