Class: Epi::Slop::Option

Inherits:
Object show all
Defined in:
lib/epitools/slop/option.rb

Constant Summary collapse

DEFAULT_OPTIONS =

The default Hash of configuration options this class uses.

{
  argument: false,
  optional_argument: false,
  tail: false,
  default: nil,
  callback: nil,
  delimiter: ',',
  limit: 0,
  match: nil,
  optional: true,
  required: false,
  as: String,
  autocreated: false
}.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(slop, short, long, description, config = {}, &block) ⇒ Option

Incapsulate internal option information, mainly used to store option specific configuration data, most of the meat of this class is found in the #value method.

slop - The instance of Slop tied to this Option. short - The String or Symbol short flag. long - The String or Symbol long flag. description - The String description text. config - A Hash of configuration options. block - An optional block used as a callback.


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# File 'lib/epitools/slop/option.rb', line 35

def initialize(slop, short, long, description, config = {}, &block)
  @slop = slop
  @short = short
  @long = long
  @description = description
  @config = DEFAULT_OPTIONS.merge(config)
  @count = 0
  @callback = block_given? ? block : config[:callback]
  @value = nil

  @types = {
    string: proc { |v| v.to_s },
    symbol: proc { |v| v.to_sym },
    integer: proc { |v| value_to_integer(v) },
    float: proc { |v| value_to_float(v) },
    range: proc { |v| value_to_range(v) },
    count: proc { @count }
  }

  if long && long.size > @slop.config[:longest_flag]
    @slop.config[:longest_flag] = long.size
  end

  @config.each_key do |key|
    predicate = :"#{key}?"
    unless self.class.method_defined?(predicate)
      self.class.__send__(:define_method, predicate) { !@config.key?(key) }
    end
  end
end

Instance Attribute Details

#argument_in_valueObject

Returns the value of attribute argument_in_value


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# File 'lib/epitools/slop/option.rb', line 23

def argument_in_value
  @argument_in_value
end

#configObject (readonly)

Returns the value of attribute config


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# File 'lib/epitools/slop/option.rb', line 22

def config
  @config
end

#countObject

Returns the value of attribute count


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# File 'lib/epitools/slop/option.rb', line 23

def count
  @count
end

#descriptionObject (readonly)

Returns the value of attribute description


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# File 'lib/epitools/slop/option.rb', line 22

def description
  @description
end

#longObject (readonly)

Returns the value of attribute long


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# File 'lib/epitools/slop/option.rb', line 22

def long
  @long
end

#shortObject (readonly)

Returns the value of attribute short


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# File 'lib/epitools/slop/option.rb', line 22

def short
  @short
end

#typesObject (readonly)

Returns the value of attribute types


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# File 'lib/epitools/slop/option.rb', line 22

def types
  @types
end

Instance Method Details

#accepts_optional_argument?Boolean

Returns true if this option accepts an optional argument.


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# File 'lib/epitools/slop/option.rb', line 72

def accepts_optional_argument?
  config[:optional_argument] || config[:argument] == :optional
end

#call(*objects) ⇒ Object

Call this options callback if one exists, and it responds to call().

Returns nothing.


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# File 'lib/epitools/slop/option.rb', line 84

def call(*objects)
  @callback.call(*objects) if @callback.respond_to?(:call)
end

#expects_argument?Boolean

Returns true if this option expects an argument.


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# File 'lib/epitools/slop/option.rb', line 67

def expects_argument?
  config[:argument] && config[:argument] != :optional
end

#inspectObject

Returns the String inspection text.


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# File 'lib/epitools/slop/option.rb', line 143

def inspect
  "#<Slop::Option [-#{short} | --#{long}" \
  "#{'=' if expects_argument?}#{'=?' if accepts_optional_argument?}]" \
  " (#{description}) #{config.inspect}"
end

#keyObject

Returns the String flag of this option. Preferring the long flag.


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# File 'lib/epitools/slop/option.rb', line 77

def key
  long || short
end

#to_sObject Also known as: help

Returns the help String for this option.


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# File 'lib/epitools/slop/option.rb', line 124

def to_s
  return config[:help] if config[:help].respond_to?(:to_str)

  out = "    #{short ? "-#{short}, " : ' ' * 4}"

  if long
    out += "--#{long}"
    size = long.size
    diff = @slop.config[:longest_flag] - size
    out += (' ' * (diff + 6))
  else
    out += (' ' * (@slop.config[:longest_flag] + 8))
  end

  "#{out}#{description}"
end

#valueObject

Fetch the argument value for this option.

Returns the Object once any type conversions have taken place.


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# File 'lib/epitools/slop/option.rb', line 108

def value
  value = @value.nil? ? config[:default] : @value

  return value if [true, false, nil].include?(value) && config[:as].to_s != 'count'

  type = config[:as]
  if type.respond_to?(:call)
    type.call(value)
  elsif (callable = types[type.to_s.downcase.to_sym])
    callable.call(value)
  else
    value
  end
end

#value=(new_value) ⇒ Object

Set the new argument value for this option.

We use this setter method to handle concatenating lists. That is, when an array type is specified and used more than once, values from both options will be grouped together and flattened into a single array.


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# File 'lib/epitools/slop/option.rb', line 93

def value=(new_value)
  if config[:as].to_s.casecmp('array') == 0
    @value ||= []

    if new_value.respond_to?(:split)
      @value.concat new_value.split(config[:delimiter], config[:limit])
    end
  else
    @value = new_value
  end
end