Class: LibCLImate::Climate

Inherits:
Object
  • Object
show all
Includes:
Xqsr3::Quality::ParameterChecking
Defined in:
lib/libclimate/climate.rb

Overview

Class used to gather together the CLI specification, and execute it

The standard usage pattern is as follows:

PROGRAM_VERSION = [ 0, 1, 2 ]

program_options = {}

climate = LibCLImate::Climate.new do |cl|

  cl.add_flag('--verbose', alias: '-v', help: 'Makes program output verbose') { program_options[:verbose] = true }

  cl.add_option('--flavour', alias: '-f', help: 'Specifies the flavour') do |o, a|

    program_options[:flavour] = check_flavour(o.value) or cl.abort "Invalid flavour '#{o.value}'; use --help for usage"
  end

  cl.usage_value = '<value-1> [ ... <value-N> ]'

  cl.info_lines = [

    'ACME CLI program (using libCLImate)',
    :version,
    'An example program',
  ]
end

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) {|_self| ... } ⇒ Climate

Creates an instance of the Climate class.

Signature

  • Parameters:

    • options:

      An options hash, containing any of the following options.

  • Options:

    • :no_help_flag

      Prevents the use of the CLASP::Flag.Help flag-alias

    • :no_version_flag

      Prevents the use of the CLASP::Version.Help flag-alias

    • :version

      A version specification. If not specified, this is

      inferred

  • Block

    An optional block which receives the constructing instance, allowing the user to modify the attributes.

Yields:

  • (_self)

Yield Parameters:



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# File 'lib/libclimate/climate.rb', line 267

def initialize(options={}) # :yields: climate

	options ||=	{}

	program_name = File.basename($0)
	program_name = (program_name =~ /\.rb$/) ? "#$`(#$&)" : program_name

	if defined? Colcon

		program_name = "#{::Colcon::Decorations::Bold}#{program_name}#{::Colcon::Decorations::Unbold}"
	end

	@aliases			=	[]
	@exit_on_unknown	=	true
	@exit_on_missing	=	true
	@exit_on_usage		=	true
	@info_lines			=	nil
	@program_name		=	program_name
	@stdout				=	$stdout
	@stderr				=	$stderr
	@usage_values		=	usage_values
	version_context		=	options[:version_context]
	@version			=	options[:version] || infer_version_(version_context)

	@aliases << CLASP::Flag.Help(handle: proc { show_usage_ }) unless options[:no_help_flag]
	@aliases << CLASP::Flag.Version(handle: proc { show_version_ }) unless options[:no_version_flag]

	yield self if block_given?
end

Instance Attribute Details

#aliases ⇒ Array (readonly)

An array of aliases attached to the climate instance, whose contents should be modified by adding (or removing) CLASP aliases

Returns:

  • (Array) —

    The aliases



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# File 'lib/libclimate/climate.rb', line 299

def aliases
  @aliases
end

#exit_on_missing ⇒ Boolean

Indicates whether exit will be called (with non-zero exit code) when a required command-line option is missing

Returns:

  • (Boolean)

  • true exit(1) will be called

  • false exit will not be called



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# File 'lib/libclimate/climate.rb', line 305

def exit_on_missing
  @exit_on_missing
end

#exit_on_unknown ⇒ Boolean

Indicates whether exit will be called (with non-zero exit code) when an unknown command-line flag or option is encountered

Returns:

  • (Boolean)

  • true exit(1) will be called

  • false exit will not be called



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# File 'lib/libclimate/climate.rb', line 310

def exit_on_unknown
  @exit_on_unknown
end

#exit_on_usage ⇒ Boolean

Returns Indicates whether exit will be called (with zero exit code) when usage/version is requested on the command-line.

Returns:

  • (Boolean) —

    Indicates whether exit will be called (with zero exit code) when usage/version is requested on the command-line



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# File 'lib/libclimate/climate.rb', line 312

def exit_on_usage
  @exit_on_usage
end

#info_lines ⇒ Array

Returns Optional array of string of program-information that will be written before the rest of the usage block when usage is requested on the command-line.

Returns:

  • (Array) —

    Optional array of string of program-information that will be written before the rest of the usage block when usage is requested on the command-line



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# File 'lib/libclimate/climate.rb', line 314

def info_lines
  @info_lines
end

#program_name ⇒ String

Returns A program name; defaults to the name of the executing script.

Returns:

  • (String) —

    A program name; defaults to the name of the executing script



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# File 'lib/libclimate/climate.rb', line 316

def program_name
  @program_name
end

#stderr ⇒ IO

Returns The output stream for contingent output; defaults to $stderr.

Returns:

  • (IO) —

    The output stream for contingent output; defaults to $stderr



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# File 'lib/libclimate/climate.rb', line 320

def stderr
  @stderr
end

#stdout ⇒ IO

Returns The output stream for normative output; defaults to $stdout.

Returns:

  • (IO) —

    The output stream for normative output; defaults to $stdout



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# File 'lib/libclimate/climate.rb', line 318

def stdout
  @stdout
end

#usage_values ⇒ String

Returns Optional string to describe the program values, eg <xyz “[ { <<directory> | &lt;file> } ]”.

Returns:

  • (String) —

    Optional string to describe the program values, eg <xyz “[ { <<directory> | &lt;file> } ]”



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# File 'lib/libclimate/climate.rb', line 322

def usage_values
  @usage_values
end

#version ⇒ String, Array

Returns A version string or an array of integers representing the version component(s).

Returns:

  • (String, Array) —

    A version string or an array of integers representing the version component(s)



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# File 'lib/libclimate/climate.rb', line 324

def version
  @version
end

Instance Method Details

#abort(message, options = {}) ⇒ Object

Calls abort() with the given message prefixed by the program_name

Signature

  • Parameters:

    • message

      The message string

    • options

      An option hash, containing any of the following options

  • Options:

    • :stream

      optional The output stream to use. Defaults to the value of the attribute stderr.

    • :program_name

      optional Uses the given value rather than the program_name attribute; does not prefix if the empty string

    • :exit

      optional The exit code. Defaults to 1. Does not exit if nil specified.

  • Return: The combined message string, if exit() not called.



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# File 'lib/libclimate/climate.rb', line 556

def abort message, options={}

	prog_name	=	options[:program_name]
	prog_name	||=	program_name
	prog_name	||=	''

	stream		=	options[:stream]
	stream		||=	stderr
	stream		||=	$stderr

	exit_code	=	options.has_key?(:exit) ? options[:exit] : 1

	if prog_name.empty?

		msg = message
	else

		msg = "#{prog_name}: #{message}"
	end


	stream.puts msg

	exit(exit_code) if exit_code

	msg
end

#add_alias(name, *aliases) ⇒ Object

Adds a flag to aliases

Signature

  • Parameters

    • name

      The flag/option name or the valued option

    • aliases

      One or more aliases

Examples

Alias(es) of a flag (single statement)

climate.add_flag(‘–mark-missing’, alias: ‘-x’)

climate.add_flag(‘–absolute-path’, aliases: [ ‘-abs’, ‘-p’ ])

Alias(es) of a flag (multiple statements)

climate.add_flag(‘–mark-missing’) climate.add_alias(‘–mark-missing’, ‘-x’)

climate.add_flag(‘–absolute-path’) climate.add_alias(‘–absolute-path’, ‘-abs’, ‘-p’)

Alias(es) of an option (single statement)

climate.add_option(‘–add-patterns’, alias: ‘-p’)

Alias(es) of an option (multiple statements)

climate.add_option(‘–add-patterns’) climate.add_alias(‘–add-patterns’, ‘-p’)

Alias of a valued option (which has to be multiple statements)

climate.add_option(‘–verbosity’) climate.add_alias(‘–verbosity=succinct’, ‘-s’) climate.add_alias(‘–verbosity=verbose’, ‘-v’)

Raises:

  • (ArgumentError) 


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# File 'lib/libclimate/climate.rb', line 657

def add_alias(name, *aliases)

	check_parameter name, 'name', allow_nil: false, types: [ ::String, ::Symbol ]
	raise ArgumentError, "must supply at least one alias" if aliases.empty?

	self.aliases << CLASP.Option(name, aliases: aliases)
end

#add_flag(name, options = {}, &block) ⇒ Object

Adds a flag to aliases

Signature

  • Parameters

    • name

      The flag name

    • options

      An options hash, containing any of the following options.

  • Options

    • :help
    • :alias
    • :aliases
    • :extras 


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# File 'lib/libclimate/climate.rb', line 597

def add_flag(name, options={}, &block)

	check_parameter name, 'name', allow_nil: false, types: [ ::String, ::Symbol ]

	aliases << CLASP.Flag(name, **options, &block)
end

#add_option(name, options = {}, &block) ⇒ Object

  • Options

    • :alias
    • :aliases
    • :help
    • :values_range
    • :default_value
    • :extras 


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# File 'lib/libclimate/climate.rb', line 612

def add_option(name, options={}, &block)

	check_parameter name, 'name', allow_nil: false, types: [ ::String, ::Symbol ]

	aliases << CLASP.Option(name, **options, &block)
end

#run(argv = ARGV) ⇒ Object

Executes the prepared Climate instance

Signature

  • Parameters:

    • argv

      The array of arguments; defaults to ARGV

  • Returns: an instance of a type derived from ::Hash with the additional attributes flags, options, values, and argv.

Raises:

  • (ArgumentError) 


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# File 'lib/libclimate/climate.rb', line 337

def run argv = ARGV

	raise ArgumentError, "argv may not be nil" if argv.nil?

	arguments	=	CLASP::Arguments.new argv, aliases
	flags		=	arguments.flags
	options		=	arguments.options
	values		=	arguments.values.to_a

	results		=	{

		flags: {

			given:		flags,
			handled:	[],
			unhandled:	[],
			unknown:	[],
		},

		options: {

			given:		options,
			handled:	[],
			unhandled:	[],
			unknown:	[],
		},

		values:	values,

		missing_option_aliases: [],
	}

	flags.each do |f|

		al = aliases.detect do |a|

			a.kind_of?(::CLASP::Flag) && f.name == a.name
		end

		if al

			selector	=	:unhandled

			# see if it has an :action attribute (which will have been
			# monkey-patched to CLASP.Flag()

			if al.respond_to?(:action) && !al.action.nil?

				al.action.call(f, al)

				selector = :handled
			else

				ex = al.extras

				case ex
				when ::Hash

					if ex.has_key? :handle

						ex[:handle].call(f, al)

						selector = :handled
					end
				end
			end

			results[:flags][selector] << f
		else

			message = "unrecognised flag '#{f}'; use --help for usage"

			if exit_on_unknown

				self.abort message
			else

				if program_name && !program_name.empty?

					message = "#{program_name}: #{message}"
				end

				stderr.puts message
			end

			results[:flags][:unknown] << f
		end
	end

	options.each do |o|

		al = aliases.detect do |a|

			a.kind_of?(::CLASP::Option) && o.name == a.name
		end

		if al

			selector	=	:unhandled

			# see if it has an :action attribute (which will have been
			# monkey-patched to CLASP.Option()

			if al.respond_to?(:action) && !al.action.nil?

				al.action.call(o, al)

				selector = :handled
			else

				ex = al.extras

				case ex
				when ::Hash

					if ex.has_key? :handle

						ex[:handle].call(o, al)

						selector = :handled
					end
				end
			end

			results[:options][selector] << o
		else

			message = "unrecognised option '#{o}'; use --help for usage"

			if exit_on_unknown

				self.abort message
			else

				if program_name && !program_name.empty?

					message = "#{program_name}: #{message}"
				end

				stderr.puts message
			end

			results[:options][:unknown] << o
		end
	end


		# now police any required options

		required_aliases = aliases.select do |a|

			a.kind_of?(::CLASP::Option) && a.required?
		end

		required_aliases = Hash[required_aliases.map { |a| [ a.name, a ] }]

		given_options = Hash[results[:options][:given].map { |o| [ o.name, o ]}]

		required_aliases.each do |k, a|

			unless given_options.has_key? k

				message = a.required_message

				if exit_on_missing

					self.abort message
				else

					if program_name && !program_name.empty?

						message = "#{program_name}: #{message}"
					end

					stderr.puts message
				end

				results[:missing_option_aliases] << a
			end
	end

	def results.flags

		self[:flags]
	end

	def results.options

		self[:options]
	end

	def results.values

		self[:values]
	end

	results.define_singleton_method(:argv) do

		argv
	end

	results
end