Class: Shell

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

Overview

Shell

Constant Summary collapse 

<<~ENDBANNER
  ___________________________

   OverTheWire wargame Natas
  ___________________________
ENDBANNER
CONFIG_FILE = 
"#{Dir.home}/.natas.yml"
PROMPT = 
'Natas> '

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Shell

Returns a new instance of Shell.



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# File 'lib/shell.rb', line 20

def initialize
  @console = Console.new
  @natas = Natas.new(self)
  @commands = []
  ObjectSpace.each_object(Class).select { |c| c < CmdBase }.each { |c| @commands << c.new(self) }
  @commands.sort! { |a, b| a.name <=> b.name }

  return unless File.exist?(CONFIG_FILE)

  config = YAML.safe_load(File.read(CONFIG_FILE))
  @natas.levels.each do |level|
    level.password = config.fetch(level.level, nil)
  end
end

Instance Attribute Details

#commands ⇒ Object (readonly)

Returns the value of attribute commands.



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# File 'lib/shell.rb', line 18

def commands
  @commands
end

#console ⇒ Object (readonly)

Returns the value of attribute console.



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# File 'lib/shell.rb', line 18

def console
  @console
end

#natas ⇒ Object (readonly)

Returns the value of attribute natas.



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# File 'lib/shell.rb', line 18

def natas
  @natas
end

Instance Method Details

#run ⇒ Object 



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

def run
  Signal.trap('INT') { exit }

  puts @console.cyan.bold(BANNER)
  cmd_help = @commands.detect { |c| c.instance_of?(CmdHelp) }
  puts @console.yellow("Type #{cmd_help.name} or #{cmd_help.aliases.first} for list of commands")

  loop do
    line = Readline.readline(@console.green.bold(PROMPT), true)
    exit if line.nil?
    line.strip!
    next if line.empty?

    Readline::HISTORY.pop if Readline::HISTORY.length > 1 && Readline::HISTORY[-2] == line
    words = line.split(/\s+/)
    cmd = words.first.downcase
    command = @commands.detect { |c| c.name == cmd || c.aliases.include?(cmd) }
    if command.nil?
      puts @console.red('Unrecognized command ') + @console.magenta.bold(cmd)
      next
    end
    command.exec(words[1..-1])
  end
end