`class Split`

Represents a split point in the command-line arguments.

A Split parser divides the argument list at a marker (typically --), allowing you to separate arguments meant for your command from those passed to another tool.

Definitions

`def initialize(key, description, marker: "--", default: nil, required: false)`

Initialize a new split parser.

Signature

parameter　key　Symbol: The name of the attribute to store the values after the split.
parameter　description　String: A description of the split for help output.
parameter　marker　String: The marker that indicates the split point.
parameter　default　Object: The default value if no split is present.
parameter　required　Boolean: Whether the split is required.

Implementation

def initialize(key, description, marker: "--", default: nil, required: false)
	@key = key
	@description = description
	@marker = marker
	@default = default
	@required = required
end

`attr :key`

The name of the attribute to store the values after the split.

Signature

attribute　Symbol

`attr :description`

A description of the split for help output.

Signature

attribute　String

`attr :marker`

The marker that indicates the split point.

Signature

attribute　String

`attr :default`

The default value if no split is present.

Signature

attribute　Object

`attr :required`

Whether the split is required.

Signature

attribute　Boolean

`def to_s`

Generate a string representation for usage output.

Signature

returns　String: The usage string.

Implementation

def to_s
	"#{@marker} <#{@key}...>"
end

`def to_a`

Generate an array representation for usage output.

Signature

returns　Array: The usage array.

Implementation

def to_a
	usage = [to_s, @description]
	
	if @default
		usage << "(default: #{@default.inspect})"
	elsif @required
		usage << "(required)"
	end
	
	return usage
end

`def parse(input, parent = nil, default = nil)`

Parse arguments after the split marker.

Signature

parameter　input　Array(String): The command-line arguments.
parameter　parent　Command | Nil: The parent command.
parameter　default　Object | Nil: An override for the default value.
returns　Array(String) | Object | Nil: The arguments after the split, or the default if no split.

Implementation

def parse(input, parent = nil, default = nil)
	if offset = input.index(@marker)
		input.pop(input.size - offset).tap(&:shift)
	elsif default ||= @default
		return default
	elsif @required
		raise MissingValueError.new(parent, @key)
	end
end