Module: Mixlib::CLI

Defined in:
lib/mixlib/cli.rb

Defined Under Namespace

Modules: ClassMethods

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

Returns the value of attribute banner.



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# File 'lib/mixlib/cli.rb', line 76

def banner
  @banner
end

#config ⇒ Object

Returns the value of attribute config.



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# File 'lib/mixlib/cli.rb', line 76

def config
  @config
end

#opt_parser ⇒ Object

Returns the value of attribute opt_parser.



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# File 'lib/mixlib/cli.rb', line 76

def opt_parser
  @opt_parser
end

#options ⇒ Object

Returns the value of attribute options.



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# File 'lib/mixlib/cli.rb', line 76

def options
  @options
end

Class Method Details

.included(receiver) ⇒ Object 



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# File 'lib/mixlib/cli.rb', line 192

def self.included(receiver)
  receiver.extend(Mixlib::CLI::ClassMethods)
end

Instance Method Details

#build_option_arguments(opt_setting) ⇒ Object 



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# File 'lib/mixlib/cli.rb', line 177

def build_option_arguments(opt_setting)      
  arguments = Array.new
  
  arguments << opt_setting[:short] if opt_setting.has_key?(:short)
  arguments << opt_setting[:long] if opt_setting.has_key?(:long)
  
  if opt_setting.has_key?(:description)
    description = opt_setting[:description]
    description << " (required)" if opt_setting[:required]
    arguments << description
  end
      
  arguments
end

#initialize(*args) ⇒ Object

Create a new Mixlib::CLI class. If you override this, make sure you call super!

Parameters

*args<Array>

The array of arguments passed to the initializer

Returns

object<Mixlib::Config>

Returns an instance of whatever you wanted :)



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# File 'lib/mixlib/cli.rb', line 85

def initialize(*args)
  @options = Hash.new
  @config  = Hash.new
  
  # Set the banner
  @banner  = self.class.banner
  
  # Dupe the class options for this instance
  klass_options = self.class.options
  klass_options.keys.inject(@options) { |memo, key| memo[key] = klass_options[key].dup; memo }
  
  # Set the default configuration values for this instance
  @options.each do |config_key, config_opts|
    config_opts[:on] ||= :on
    config_opts[:boolean] ||= false
    config_opts[:required] ||= false
    config_opts[:proc] ||= nil
    config_opts[:show_options] ||= false
    config_opts[:exit] ||= nil
    
    if config_opts.has_key?(:default)
      @config[config_key] = config_opts[:default]
    end
  end
  
  super(*args)
end

#parse_options(argv = ARGV) ⇒ Object

Parses an array, by default ARGV, for command line options (as configured at the class level).

Parameters

argv<Array>

The array of arguments to parse; defaults to ARGV

Returns

argv<Array>

Returns any un-parsed elements.



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# File 'lib/mixlib/cli.rb', line 120

def parse_options(argv=ARGV)
  argv = argv.dup
  @opt_parser = OptionParser.new do |opts|  
    # Set the banner
    opts.banner = banner        
    
    # Create new options
    options.sort { |a, b| a[0].to_s <=> b[0].to_s }.each do |opt_key, opt_val|          
      opt_args = build_option_arguments(opt_val)
      
      opt_method = case opt_val[:on]
        when :on
          :on
        when :tail
          :on_tail
        when :head
          :on_head
        else
          raise ArgumentError, "You must pass :on, :tail, or :head to :on"
        end
                  
      parse_block = case opt_val[:boolean]
        when true
          Proc.new() do
            config[opt_key] = (opt_val[:proc] && opt_val[:proc].call(true)) || true
            puts opts if opt_val[:show_options]
            exit opt_val[:exit] if opt_val[:exit]
          end
        when false
          Proc.new() do |c|
            config[opt_key] = (opt_val[:proc] && opt_val[:proc].call(c)) || c
            puts opts if opt_val[:show_options]
            exit opt_val[:exit] if opt_val[:exit]
          end
        end
                
      full_opt = [ opt_method ]
      opt_args.inject(full_opt) { |memo, arg| memo << arg; memo }
      full_opt << parse_block
      opts.send(*full_opt)
    end
  end
  @opt_parser.parse!(argv)
  
  # Deal with any required values
  options.each do |opt_key, opt_value|
    if opt_value[:required]
      reqarg = opt_value[:short] || opt_value[:long]
      puts "You must supply #{reqarg}!"
      puts @opt_parser
      exit 2
    end
  end
  
  argv
end