Class: Slop::Options

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/slop/options.rb

Constant Summary collapse

DEFAULT_CONFIG = 
{
  suppress_errors:  false,
  type:             "null",
  banner:           true,
  underscore_flags: true,
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(**config) {|_self| ... } ⇒ Options

Returns a new instance of Options.

Yields:

  • (_self)

Yield Parameters:

  • _self (Slop::Options) —

    the object that the method was called on


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# File 'lib/slop/options.rb', line 27

def initialize(**config, &block)
  @options    = []
  @separators = []
  @banner     = config[:banner].is_a?(String) ? config[:banner] : config.fetch(:banner, "usage: #{$0} [options]")
  @config     = DEFAULT_CONFIG.merge(config)
  @parser     = Parser.new(self, **@config)

  yield self if block_given?
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args, **config, &block) ⇒ Object

Handle custom option types. Will fall back to raising an exception if an option is not defined.


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# File 'lib/slop/options.rb', line 82

def method_missing(name, *args, **config, &block)
  if respond_to_missing?(name)
    config[:type] = name
    on(*args, **config, &block)
  else
    super
  end
end

Instance Attribute Details

The String banner prefixed to the help string.


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# File 'lib/slop/options.rb', line 25

def banner
  @banner
end

#config ⇒ Object (readonly)

A Hash of configuration options.


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# File 'lib/slop/options.rb', line 22

def config
  @config
end

#options ⇒ Object (readonly)

The Array of Option instances we've created.


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# File 'lib/slop/options.rb', line 13

def options
  @options
end

#parser ⇒ Object (readonly)

Our Parser instance.


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# File 'lib/slop/options.rb', line 19

def parser
  @parser
end

#separators ⇒ Object (readonly)

An Array of separators used for the help text.


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# File 'lib/slop/options.rb', line 16

def separators
  @separators
end

Instance Method Details

#each(&block) ⇒ Object

Implements the Enumerable interface.


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# File 'lib/slop/options.rb', line 76

def each(&block)
  options.each(&block)
end

#on(*flags, **config, &block) ⇒ Object

Add a new option. This method is an alias for adding a NullOption (i.e an option with an ignored return value).

Example:

opts = Slop.parse do |o|
  o.on '--version' do
    puts Slop::VERSION
  end
end

opts.to_hash #=> {}

Returns the newly created Option subclass.


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# File 'lib/slop/options.rb', line 51

def on(*flags, **config, &block)
  desc   = flags.pop unless flags.last.start_with?('-')
  config = self.config.merge(config)
  klass  = Slop.string_to_option_class(config[:type].to_s)
  option = klass.new(flags, desc, **config, &block)

  add_option option
end

#parse(strings) ⇒ Object

Sugar to avoid `options.parser.parse(x)`.


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# File 'lib/slop/options.rb', line 71

def parse(strings)
  parser.parse(strings)
end

#respond_to_missing?(name, include_private = false) ⇒ Boolean

Returns:

  • (Boolean) 

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# File 'lib/slop/options.rb', line 91

def respond_to_missing?(name, include_private = false)
  Slop.option_defined?(name) || super
end

#separator(string = "") ⇒ Object

Add a separator between options. Used when displaying the help text.


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# File 'lib/slop/options.rb', line 62

def separator(string = "")
  if separators[options.size]
    separators[-1] += "\n#{string}"
  else
    separators[options.size] = string
  end
end

#to_a ⇒ Object

Return a copy of our options Array.


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# File 'lib/slop/options.rb', line 96

def to_a
  options.dup
end

#to_s(prefix: " " * 4) ⇒ Object

Returns the help text for this options. Used by Result#to_s.


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# File 'lib/slop/options.rb', line 101

def to_s(prefix: " " * 4)
  str = config[:banner] ? "#{banner}\n" : ""
  len = longest_flag_length

  options.select.each_with_index.sort_by{ |o,i| [o.tail, i] }.each do |opt, i|
    # use the index to fetch an associated separator
    if sep = separators[i]
      str += "#{sep}\n"
    end

    str += "#{prefix}#{opt.to_s(offset: len)}\n" if opt.help?
  end

  if sep = separators[options.size]
    str += "#{sep}\n"
  end

  str
end