Class: OptionParser

Inherits:
Object
  • Object
show all
Defined in:
lib/optparse.rb

Overview

–

Developer Documentation (not for RDoc output)

Class tree

  • OptionParser

    front end

  • OptionParser::Switch

    each switches

  • OptionParser::List

    options list

  • OptionParser::ParseError

    errors on parsing

    • OptionParser::AmbiguousOption

    • OptionParser::NeedlessArgument

    • OptionParser::MissingArgument

    • OptionParser::InvalidOption

    • OptionParser::InvalidArgument

      • OptionParser::AmbiguousArgument

Object relationship diagram

+--------------+
| OptionParser |<>-----+
+--------------+       |                      +--------+
                       |                    ,-| Switch |
     on_head -------->+---------------+    /  +--------+
     accept/reject -->| List          |<|>-
                      |               |<|>-  +----------+
     on ------------->+---------------+    `-| argument |
                        :           :        |  class   |
                      +---------------+      |==========|
     on_tail -------->|               |      |pattern   |
                      +---------------+      |----------|
OptionParser.accept ->| DefaultList   |      |converter |
             reject   |(shared between|      +----------+
                      | all instances)|
                      +---------------+

++

OptionParser

Introduction

OptionParser is a class for command-line option analysis. It is much more advanced, yet also easier to use, than GetoptLong, and is a more Ruby-oriented solution.

Features

  1. The argument specification and the code to handle it are written in the same place.

  2. It can output an option summary; you don’t need to maintain this string separately.

  3. Optional and mandatory arguments are specified very gracefully.

  4. Arguments can be automatically converted to a specified class.

  5. Arguments can be restricted to a certain set.

All of these features are demonstrated in the examples below. See #make_switch for full documentation.

Minimal example

require 'optparse'

options = {}
OptionParser.new do |opts|
  opts.banner = "Usage: example.rb [options]"

  opts.on("-v", "--[no-]verbose", "Run verbosely") do |v|
    options[:verbose] = v
  end
end.parse!

p options
p ARGV

Generating Help

OptionParser can be used to automatically generate help for the commands you write:

require 'optparse'

Options = Struct.new(:name)

class Parser
  def self.parse(options)
    args = Options.new("world")

    opt_parser = OptionParser.new do |opts|
      opts.banner = "Usage: example.rb [options]"

      opts.on("-nNAME", "--name=NAME", "Name to say hello to") do |n|
        args.name = n
      end

      opts.on("-h", "--help", "Prints this help") do
        puts opts
        exit
      end
    end

    opt_parser.parse!(options)
    return args
  end
end
options = Parser.parse %w[--help]

#=>
   # Usage: example.rb [options]
   #     -n, --name=NAME                  Name to say hello to
   #     -h, --help                       Prints this help

Required Arguments

For options that require an argument, option specification strings may include an option name in all caps. If an option is used without the required argument, an exception will be raised.

require 'optparse'

options = {}
OptionParser.new do |parser|
  parser.on("-r", "--require LIBRARY",
            "Require the LIBRARY before executing your script") do |lib|
    puts "You required #{lib}!"
  end
end.parse!

Used:

bash-3.2$ ruby optparse-test.rb -r
optparse-test.rb:9:in `<main>': missing argument: -r (OptionParser::MissingArgument)
bash-3.2$ ruby optparse-test.rb -r my-library
You required my-library!

Type Coercion

OptionParser supports the ability to coerce command line arguments into objects for us.

OptionParser comes with a few ready-to-use kinds of type coercion. They are:

  • Date – Anything accepted by Date.parse

  • DateTime – Anything accepted by DateTime.parse

  • Time – Anything accepted by Time.httpdate or Time.parse

  • URI – Anything accepted by URI.parse

  • Shellwords – Anything accepted by Shellwords.shellwords

  • String – Any non-empty string

  • Integer – Any integer. Will convert octal. (e.g. 124, -3, 040)

  • Float – Any float. (e.g. 10, 3.14, -100E+13)

  • Numeric – Any integer, float, or rational (1, 3.4, 1/3)

  • DecimalInteger – Like Integer, but no octal format.

  • OctalInteger – Like Integer, but no decimal format.

  • DecimalNumeric – Decimal integer or float.

  • TrueClass – Accepts ‘+, yes, true, -, no, false’ and defaults as true

  • FalseClass – Same as TrueClass, but defaults to false

  • Array – Strings separated by ‘,’ (e.g. 1,2,3)

  • Regexp – Regular expressions. Also includes options.

We can also add our own coercions, which we will cover soon.

Using Built-in Conversions

As an example, the built-in Time conversion is used. The other built-in conversions behave in the same way. OptionParser will attempt to parse the argument as a Time. If it succeeds, that time will be passed to the handler block. Otherwise, an exception will be raised.

require 'optparse'
require 'optparse/time'
OptionParser.new do |parser|
  parser.on("-t", "--time [TIME]", Time, "Begin execution at given time") do |time|
    p time
  end
end.parse!

Used:

bash-3.2$ ruby optparse-test.rb  -t nonsense
... invalid argument: -t nonsense (OptionParser::InvalidArgument)
from ... time.rb:5:in `block in <top (required)>'
from optparse-test.rb:31:in `<main>'
bash-3.2$ ruby optparse-test.rb  -t 10-11-12
2010-11-12 00:00:00 -0500
bash-3.2$ ruby optparse-test.rb  -t 9:30
2014-08-13 09:30:00 -0400

Creating Custom Conversions

The accept method on OptionParser may be used to create converters. It specifies which conversion block to call whenever a class is specified. The example below uses it to fetch a User object before the on handler receives it.

require 'optparse'

User = Struct.new(:id, :name)

def find_user id
  not_found = ->{ raise "No User Found for id #{id}" }
  [ User.new(1, "Sam"),
    User.new(2, "Gandalf") ].find(not_found) do |u|
    u.id == id
  end
end

op = OptionParser.new
op.accept(User) do |user_id|
  find_user user_id.to_i
end

op.on("--user ID", User) do |user|
  puts user
end

op.parse!

output:

bash-3.2$ ruby optparse-test.rb --user 1
#<struct User id=1, name="Sam">
bash-3.2$ ruby optparse-test.rb --user 2
#<struct User id=2, name="Gandalf">
bash-3.2$ ruby optparse-test.rb --user 3
optparse-test.rb:15:in `block in find_user': No User Found for id 3 (RuntimeError)

Complete example

The following example is a complete Ruby program. You can run it and see the effect of specifying various options. This is probably the best way to learn the features of optparse.

require 'optparse'
require 'optparse/time'
require 'ostruct'
require 'pp'

class OptparseExample
  Version = '1.0.0'

  CODES = %w[iso-2022-jp shift_jis euc-jp utf8 binary]
  CODE_ALIASES = { "jis" => "iso-2022-jp", "sjis" => "shift_jis" }

  class ScriptOptions
    attr_accessor :library, :inplace, :encoding, :transfer_type,
                  :verbose
    def initialize
      self.library = []
      self.inplace = false
      self.encoding = "utf8"
      self.transfer_type = :auto
      self.verbose = false
    end
  end

  #
  # Return a structure describing the options.
  #
  def self.parse(args)
    # The options specified on the command line will be collected in
    # *options*.

    @options = ScriptOptions.new
    option_parser.parse!(args)
    @options
  end

  attr_reader :parser, :options

  def option_parser
    @parser ||= OptionParser.new do |parser|
      parser.banner = "Usage: example.rb [options]"
      parser.separator ""
      parser.separator "Specific options:"

      # add additional options
      perform_inplace_option
      delay_execution_option
      execute_at_time_option
      specify_record_separator_option
      list_example_option
      specify_encoding_option
      optional_option_argument_with_keyword_completion_option
      boolean_verbose_option

      parser.separator ""
      parser.separator "Common options:"
      # No argument, shows at tail.  This will print an options summary.
      # Try it and see!
      parser.on_tail("-h", "--help", "Show this message") do
        puts parser
        exit
      end
      # Another typical switch to print the version.
      parser.on_tail("--version", "Show version") do
        puts Version
        exit
      end
    end
  end

  def perform_inplace_option
    # Specifies an optional option argument
    parser.on("-i", "--inplace [EXTENSION]",
            "Edit ARGV files in place",
            "  (make backup if EXTENSION supplied)") do |ext|
      options.inplace = true
      options.extension = ext || ''
      options.extension.sub!(/\A\.?(?=.)/, ".")  # Ensure extension begins with dot.
    end
  end

  def delay_execution_option
    # Cast 'delay' argument to a Float.
    parser.on("--delay N", Float, "Delay N seconds before executing") do |n|
      options.delay = n
    end
  end

  def execute_at_time_option
    # Cast 'time' argument to a Time object.
    parser.on("-t", "--time [TIME]", Time, "Begin execution at given time") do |time|
      options.time = time
    end
  end

  def specify_record_separator_option
    # Cast to octal integer.
    parser.on("-F", "--irs [OCTAL]", OptionParser::OctalInteger,
            "Specify record separator (default \\0)") do |rs|
      options.record_separator = rs
    end
  end

  def list_example_option
    # List of arguments.
    parser.on("--list x,y,z", Array, "Example 'list' of arguments") do |list|
      options.list = list
    end
  end

  def specify_encoding_option
    # Keyword completion.  We are specifying a specific set of arguments (CODES
    # and CODE_ALIASES - notice the latter is a Hash), and the user may provide
    # the shortest unambiguous text.
    code_list = (CODE_ALIASES.keys + CODES).join(',')
    parser.on("--code CODE", CODES, CODE_ALIASES, "Select encoding",
            "  (#{code_list})") do |encoding|
      options.encoding = encoding
    end
  end

  def optional_option_argument_with_keyword_completion_option
    # Optional '--type' option argument with keyword completion.
    parser.on("--type [TYPE]", [:text, :binary, :auto],
                  "Select transfer type (text, binary, auto)") do |t|
      options.transfer_type = t
    end
  end

  def boolean_verbose_option
    # Boolean switch.
    parser.on("-v", "--[no-]verbose", "Run verbosely") do |v|
      options.verbose = v
    end
  end

end  # class OptparseExample
options = OptparseExample.parse(ARGV)
pp options
pp ARGV

Shell Completion

For modern shells (e.g. bash, zsh, etc.), you can use shell completion for command line options.

Further documentation

The above examples should be enough to learn how to use this class. If you have any questions, file a ticket at bugs.ruby-lang.org.

Defined Under Namespace

Modules: Acceptables, Arguable, Completion Classes: AmbiguousArgument, AmbiguousOption, CompletingHash, InvalidArgument, InvalidOption, List, MissingArgument, NeedlessArgument, OptionMap, ParseError, Switch

Constant Summary collapse

NoArgument =

:stopdoc:

[NO_ARGUMENT = :NONE, nil].freeze
RequiredArgument = 
[REQUIRED_ARGUMENT = :REQUIRED, true].freeze
OptionalArgument = 
[OPTIONAL_ARGUMENT = :OPTIONAL, false].freeze
ArgumentStyle =

Enumeration of acceptable argument styles. Possible values are:

NO_ARGUMENT

The switch takes no arguments. (:NONE)

REQUIRED_ARGUMENT

The switch requires an argument. (:REQUIRED)

OPTIONAL_ARGUMENT

The switch requires an optional argument. (:OPTIONAL)

Use like –switch=argument (long style) or -Xargument (short style). For short style, only portion matched to argument pattern is treated as argument.

{}
DefaultList =

Switches common used such as ‘–’, and also provides default argument classes

List.new
COMPSYS_HEADER =

:nodoc:

<<'XXX'      # :nodoc:

typeset -A opt_args
local context state line

_argume
Officious =

Default options for ARGV, which never appear in option summary.

{}
SPLAT_PROC =

:nodoc:

proc {|*a| a.length <= 1 ? a.first : a}
DecimalInteger =

Decimal integer format, to be converted to Integer.

/\A[-+]?#{decimal}\z/io
OctalInteger =

Ruby/C like octal/hexadecimal/binary integer format, to be converted to Integer.

/\A[-+]?(?:[0-7]+(?:_[0-7]+)*|0(?:#{binary}|#{hex}))\z/io
DecimalNumeric =

Decimal integer/float number format, to be converted to Integer for integer format, Float for float format.

floatpat

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(banner = nil, width = 32, indent = ' ' * 4) {|_self| ... } ⇒ OptionParser

Initializes the instance and yields itself if called with a block.

banner

Banner message.

width

Summary width.

indent

Summary indent.

Yields:

  • (_self)

Yield Parameters:

  • _self (OptionParser) —

    the object that the method was called on



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# File 'lib/optparse.rb', line 1053

def initialize(banner = nil, width = 32, indent = ' ' * 4)
  @stack = [DefaultList, List.new, List.new]
  @program_name = nil
  @banner = banner
  @summary_width = width
  @summary_indent = indent
  @default_argv = ARGV
  add_officious
  yield self if block_given?
end

Instance Attribute Details

Heading banner preceding summary.



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# File 'lib/optparse.rb', line 1136

def banner
  unless @banner
    @banner = "Usage: #{program_name} [options]"
    visit(:add_banner, @banner)
  end
  @banner
end

#default_argv ⇒ Object

Strings to be parsed in default.



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# File 'lib/optparse.rb', line 1131

def default_argv
  @default_argv
end

#program_name ⇒ Object

Program name to be emitted in error message and default banner, defaults to $0.



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# File 'lib/optparse.rb', line 1148

def program_name
  @program_name || File.basename($0, '.*')
end

#release ⇒ Object

Release code



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# File 'lib/optparse.rb', line 1173

def release
  @release || (defined?(::Release) && ::Release) || (defined?(::RELEASE) && ::RELEASE)
end

#summary_indent ⇒ Object

Indentation for summary. Must be String (or have + String method).



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# File 'lib/optparse.rb', line 1128

def summary_indent
  @summary_indent
end

#summary_width ⇒ Object

Width for option list portion of summary. Must be Numeric.



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# File 'lib/optparse.rb', line 1125

def summary_width
  @summary_width
end

#version ⇒ Object

Version



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# File 'lib/optparse.rb', line 1166

def version
  @version || (defined?(::Version) && ::Version)
end

Class Method Details

.accept(*args, &blk) ⇒ Object

See #accept.



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# File 'lib/optparse.rb', line 1098

def self.accept(*args, &blk) top.accept(*args, &blk) end

.getopts(*args) ⇒ Object

See #getopts.



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# File 'lib/optparse.rb', line 1684

def self.getopts(*args)
  new.getopts(*args)
end

.inc(arg, default = nil) ⇒ Object

Returns an incremented value of default according to arg.



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# File 'lib/optparse.rb', line 1034

def self.inc(arg, default = nil)
  case arg
  when Integer
    arg.nonzero?
  when nil
    default.to_i + 1
  end
end

.reject(*args, &blk) ⇒ Object

See #reject.



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# File 'lib/optparse.rb', line 1111

def self.reject(*args, &blk) top.reject(*args, &blk) end

.terminate(arg = nil) ⇒ Object 



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# File 'lib/optparse.rb', line 1078

def self.terminate(arg = nil)
  throw :terminate, arg
end

.top ⇒ Object 



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# File 'lib/optparse.rb', line 1083

def self.top() DefaultList end

.with(*args, &block) ⇒ Object

Initializes a new instance and evaluates the optional block in context of the instance. Arguments args are passed to #new, see there for description of parameters.

This method is deprecated, its behavior corresponds to the older #new method.



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# File 'lib/optparse.rb', line 1025

def self.with(*args, &block)
  opts = new(*args)
  opts.instance_eval(&block)
  opts
end

Instance Method Details

#abort(mesg = $!) ⇒ Object 



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# File 'lib/optparse.rb', line 1192

def abort(mesg = $!)
  super("#{program_name}: #{mesg}")
end

#accept(*args, &blk) ⇒ Object

Directs to accept specified class t. The argument string is passed to the block in which it should be converted to the desired class.

t

Argument class specifier, any object including Class.

pat

Pattern for argument, defaults to t if it responds to match.

accept(t, pat, &block)



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# File 'lib/optparse.rb', line 1094

def accept(*args, &blk) top.accept(*args, &blk) end

#add_officious ⇒ Object

:nodoc:



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# File 'lib/optparse.rb', line 1064

def add_officious  # :nodoc:
  list = base()
  Officious.each do |opt, block|
    list.long[opt] ||= block.call(self)
  end
end

#base ⇒ Object

Subject of #on_tail.



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# File 'lib/optparse.rb', line 1206

def base
  @stack[1]
end

#candidate(word) ⇒ Object 



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# File 'lib/optparse.rb', line 1731

def candidate(word)
  list = []
  case word
  when /\A--/
    word, arg = word.split(/=/, 2)
    argpat = Completion.regexp(arg, false) if arg and !arg.empty?
    long = true
  when /\A-(!-)/
    short = true
  when /\A-/
    long = short = true
  end
  pat = Completion.regexp(word, true)
  visit(:each_option) do |opt|
    next unless Switch === opt
    opts = (long ? opt.long : []) + (short ? opt.short : [])
    opts = Completion.candidate(word, true, pat, &opts.method(:each)).map(&:first) if pat
    if /\A=/ =~ opt.arg
      opts.map! {|sw| sw + "="}
      if arg and CompletingHash === opt.pattern
        if opts = opt.pattern.candidate(arg, false, argpat)
          opts.map!(&:last)
        end
      end
    end
    list.concat(opts)
  end
  list
end

#compsys(to, name = File.basename($0)) ⇒ Object

:nodoc:



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# File 'lib/optparse.rb', line 942

def compsys(to, name = File.basename($0)) # :nodoc:
  to << "#compdef #{name}\n"
  to << COMPSYS_HEADER
  visit(:compsys, {}, {}) {|o, d|
    to << %Q[  "#{o}[#{d.gsub(/[\"\[\]]/, '\\\\\&')}]" \\\n]
  }
  to << "  '*:file:_files' && return 0\n"
end

#define(*opts, &block) ⇒ Object Also known as: def_option 



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# File 'lib/optparse.rb', line 1455

def define(*opts, &block)
  top.append(*(sw = make_switch(opts, block)))
  sw[0]
end

#define_head(*opts, &block) ⇒ Object Also known as: def_head_option 



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# File 'lib/optparse.rb', line 1470

def define_head(*opts, &block)
  top.prepend(*(sw = make_switch(opts, block)))
  sw[0]
end

#define_tail(*opts, &block) ⇒ Object Also known as: def_tail_option 



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# File 'lib/optparse.rb', line 1484

def define_tail(*opts, &block)
  base.append(*(sw = make_switch(opts, block)))
  sw[0]
end

#environment(env = File.basename($0, '.*')) ⇒ Object

Parses environment variable env or its uppercase with splitting like a shell.

env defaults to the basename of the program.



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# File 'lib/optparse.rb', line 1788

def environment(env = File.basename($0, '.*'))
  env = ENV[env] || ENV[env.upcase] or return
  require 'shellwords'
  parse(*Shellwords.shellwords(env))
end

#getopts(*args) ⇒ Object

Wrapper method for getopts.rb.

params = ARGV.getopts("ab:", "foo", "bar:", "zot:Z;zot option)
# params[:a] = true   # -a
# params[:b] = "1"    # -b1
# params[:foo] = "1"  # --foo
# params[:bar] = "x"  # --bar x
# params[:zot] = "z"  # --zot Z



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# File 'lib/optparse.rb', line 1649

def getopts(*args)
  argv = Array === args.first ? args.shift : default_argv
  single_options, *long_options = *args

  result = {}

  single_options.scan(/(.)(:)?/) do |opt, val|
    if val
      result[opt] = nil
      define("-#{opt} VAL")
    else
      result[opt] = false
      define("-#{opt}")
    end
  end if single_options

  long_options.each do |arg|
    arg, desc = arg.split(';', 2)
    opt, val = arg.split(':', 2)
    if val
      result[opt] = val.empty? ? nil : val
      define("--#{opt}=#{result[opt] || "VAL"}", *[desc].compact)
    else
      result[opt] = false
      define("--#{opt}", *[desc].compact)
    end
  end

  parse_in_order(argv, result.method(:[]=))
  result
end

#help ⇒ Object Also known as: to_s

Returns option summary string.



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# File 'lib/optparse.rb', line 1247

def help; summarize("#{banner}".sub(/\n?\z/, "\n")) end

#inc(*args) ⇒ Object 



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# File 'lib/optparse.rb', line 1042

def inc(*args)
  self.class.inc(*args)
end

#load(filename = nil) ⇒ Object

Loads options from file names as filename. Does nothing when the file is not present. Returns whether successfully loaded.

filename defaults to basename of the program without suffix in a directory ~/.options.



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# File 'lib/optparse.rb', line 1768

def load(filename = nil)
  begin
    filename ||= File.expand_path(File.basename($0, '.*'), '~/.options')
  rescue
    return false
  end
  begin
    parse(*IO.readlines(filename).each {|s| s.chomp!})
    true
  rescue Errno::ENOENT, Errno::ENOTDIR
    false
  end
end

#make_switch(opts, block = nil) ⇒ Object

Creates an OptionParser::Switch from the parameters. The parsed argument value is passed to the given block, where it can be processed.

See at the beginning of OptionParser for some full examples.

opts can include the following elements:

Argument style:

One of the following:

:NONE, :REQUIRED, :OPTIONAL
Argument pattern:

Acceptable option argument format, must be pre-defined with OptionParser.accept or OptionParser#accept, or Regexp. This can appear once or assigned as String if not present, otherwise causes an ArgumentError. Examples:

Float, Time, Array
Possible argument values:

Hash or Array.

[:text, :binary, :auto]
%w[iso-2022-jp shift_jis euc-jp utf8 binary]
{ "jis" => "iso-2022-jp", "sjis" => "shift_jis" }
Long style switch:

Specifies a long style switch which takes a mandatory, optional or no argument. It’s a string of the following form:

"--switch=MANDATORY" or "--switch MANDATORY"
"--switch[=OPTIONAL]"
"--switch"
Short style switch:

Specifies short style switch which takes a mandatory, optional or no argument. It’s a string of the following form:

"-xMANDATORY"
"-x[OPTIONAL]"
"-x"

There is also a special form which matches character range (not full set of regular expression):

"-[a-z]MANDATORY"
"-[a-z][OPTIONAL]"
"-[a-z]"
Argument style and description:

Instead of specifying mandatory or optional arguments directly in the switch parameter, this separate parameter can be used.

"=MANDATORY"
"=[OPTIONAL]"
Description:

Description string for the option.

"Run verbosely"
Handler:

Handler for the parsed argument value. Either give a block or pass a Proc or Method as an argument.



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# File 'lib/optparse.rb', line 1331

def make_switch(opts, block = nil)
  short, long, nolong, style, pattern, conv, not_pattern, not_conv, not_style = [], [], []
  ldesc, sdesc, desc, arg = [], [], []
  default_style = Switch::NoArgument
  default_pattern = nil
  klass = nil
  q, a = nil

  opts.each do |o|
    # argument class
    next if search(:atype, o) do |pat, c|
      klass = notwice(o, klass, 'type')
      if not_style and not_style != Switch::NoArgument
        not_pattern, not_conv = pat, c
      else
        default_pattern, conv = pat, c
      end
    end

    # directly specified pattern(any object possible to match)
    if (!(String === o || Symbol === o)) and o.respond_to?(:match)
      pattern = notwice(o, pattern, 'pattern')
      if pattern.respond_to?(:convert)
        conv = pattern.method(:convert).to_proc
      else
        conv = SPLAT_PROC
      end
      next
    end

    # anything others
    case o
    when Proc, Method
      block = notwice(o, block, 'block')
    when Array, Hash
      case pattern
      when CompletingHash
      when nil
        pattern = CompletingHash.new
        conv = pattern.method(:convert).to_proc if pattern.respond_to?(:convert)
      else
        raise ArgumentError, "argument pattern given twice"
      end
      o.each {|pat, *v| pattern[pat] = v.fetch(0) {pat}}
    when Module
      raise ArgumentError, "unsupported argument type: #{o}", ParseError.filter_backtrace(caller(4))
    when *ArgumentStyle.keys
      style = notwice(ArgumentStyle[o], style, 'style')
    when /^--no-([^\[\]=\s]*)(.+)?/
      q, a = $1, $2
      o = notwice(a ? Object : TrueClass, klass, 'type')
      not_pattern, not_conv = search(:atype, o) unless not_style
      not_style = (not_style || default_style).guess(arg = a) if a
      default_style = Switch::NoArgument
      default_pattern, conv = search(:atype, FalseClass) unless default_pattern
      ldesc << "--no-#{q}"
      long << 'no-' + (q = q.downcase)
      nolong << q
    when /^--\[no-\]([^\[\]=\s]*)(.+)?/
      q, a = $1, $2
      o = notwice(a ? Object : TrueClass, klass, 'type')
      if a
        default_style = default_style.guess(arg = a)
        default_pattern, conv = search(:atype, o) unless default_pattern
      end
      ldesc << "--[no-]#{q}"
      long << (o = q.downcase)
      not_pattern, not_conv = search(:atype, FalseClass) unless not_style
      not_style = Switch::NoArgument
      nolong << 'no-' + o
    when /^--([^\[\]=\s]*)(.+)?/
      q, a = $1, $2
      if a
        o = notwice(NilClass, klass, 'type')
        default_style = default_style.guess(arg = a)
        default_pattern, conv = search(:atype, o) unless default_pattern
      end
      ldesc << "--#{q}"
      long << (o = q.downcase)
    when /^-(\[\^?\]?(?:[^\\\]]|\\.)*\])(.+)?/
      q, a = $1, $2
      o = notwice(Object, klass, 'type')
      if a
        default_style = default_style.guess(arg = a)
        default_pattern, conv = search(:atype, o) unless default_pattern
      end
      sdesc << "-#{q}"
      short << Regexp.new(q)
    when /^-(.)(.+)?/
      q, a = $1, $2
      if a
        o = notwice(NilClass, klass, 'type')
        default_style = default_style.guess(arg = a)
        default_pattern, conv = search(:atype, o) unless default_pattern
      end
      sdesc << "-#{q}"
      short << q
    when /^=/
      style = notwice(default_style.guess(arg = o), style, 'style')
      default_pattern, conv = search(:atype, Object) unless default_pattern
    else
      desc.push(o)
    end
  end

  default_pattern, conv = search(:atype, default_style.pattern) unless default_pattern
  if !(short.empty? and long.empty?)
    s = (style || default_style).new(pattern || default_pattern,
                                     conv, sdesc, ldesc, arg, desc, block)
  elsif !block
    if style or pattern
      raise ArgumentError, "no switch given", ParseError.filter_backtrace(caller)
    end
    s = desc
  else
    short << pattern
    s = (style || default_style).new(pattern,
                                     conv, nil, nil, arg, desc, block)
  end
  return s, short, long,
    (not_style.new(not_pattern, not_conv, sdesc, ldesc, nil, desc, block) if not_style),
    nolong
end

#new ⇒ Object

Pushes a new List.



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# File 'lib/optparse.rb', line 1213

def new
  @stack.push(List.new)
  if block_given?
    yield self
  else
    self
  end
end

#on(*opts, &block) ⇒ Object

Add option switch and handler. See #make_switch for an explanation of parameters.



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# File 'lib/optparse.rb', line 1464

def on(*opts, &block)
  define(*opts, &block)
  self
end

#on_head(*opts, &block) ⇒ Object

Add option switch like with #on, but at head of summary.



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# File 'lib/optparse.rb', line 1478

def on_head(*opts, &block)
  define_head(*opts, &block)
  self
end

#on_tail(*opts, &block) ⇒ Object

Add option switch like with #on, but at tail of summary.



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# File 'lib/optparse.rb', line 1492

def on_tail(*opts, &block)
  define_tail(*opts, &block)
  self
end

#order(*argv, &block) ⇒ Object

Parses command line arguments argv in order. When a block is given, each non-option argument is yielded.

Returns the rest of argv left unparsed.



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# File 'lib/optparse.rb', line 1511

def order(*argv, &block)
  argv = argv[0].dup if argv.size == 1 and Array === argv[0]
  order!(argv, &block)
end

#order!(argv = default_argv, &nonopt) ⇒ Object

Same as #order, but removes switches destructively. Non-option arguments remain in argv.



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# File 'lib/optparse.rb', line 1520

def order!(argv = default_argv, &nonopt)
  parse_in_order(argv, &nonopt)
end

#parse(*argv) ⇒ Object

Parses command line arguments argv in order when environment variable POSIXLY_CORRECT is set, and in permutation mode otherwise.



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# File 'lib/optparse.rb', line 1622

def parse(*argv)
  argv = argv[0].dup if argv.size == 1 and Array === argv[0]
  parse!(argv)
end

#parse!(argv = default_argv) ⇒ Object

Same as #parse, but removes switches destructively. Non-option arguments remain in argv.



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# File 'lib/optparse.rb', line 1631

def parse!(argv = default_argv)
  if ENV.include?('POSIXLY_CORRECT')
    order!(argv)
  else
    permute!(argv)
  end
end

#permute(*argv) ⇒ Object

Parses command line arguments argv in permutation mode and returns list of non-option arguments.



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# File 'lib/optparse.rb', line 1602

def permute(*argv)
  argv = argv[0].dup if argv.size == 1 and Array === argv[0]
  permute!(argv)
end

#permute!(argv = default_argv) ⇒ Object

Same as #permute, but removes switches destructively. Non-option arguments remain in argv.



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# File 'lib/optparse.rb', line 1611

def permute!(argv = default_argv)
  nonopts = []
  order!(argv, &nonopts.method(:<<))
  argv[0, 0] = nonopts
  argv
end

#reject(*args, &blk) ⇒ Object

Directs to reject specified class argument.

t

Argument class specifier, any object including Class.

reject(t)



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# File 'lib/optparse.rb', line 1107

def reject(*args, &blk) top.reject(*args, &blk) end

#remove ⇒ Object

Removes the last List.



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# File 'lib/optparse.rb', line 1225

def remove
  @stack.pop
end

#separator(string) ⇒ Object

Add separator in summary.



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# File 'lib/optparse.rb', line 1501

def separator(string)
  top.append(string, nil, nil)
end

#summarize(to = [], width = @summary_width, max = width - 1, indent = @summary_indent, &blk) ⇒ Object

Puts option summary into to and returns to. Yields each line if a block is given.

to

Output destination, which must have method <<. Defaults to [].

width

Width of left side, defaults to @summary_width.

max

Maximum length allowed for left side, defaults to width - 1.

indent

Indentation, defaults to @summary_indent.



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# File 'lib/optparse.rb', line 1238

def summarize(to = [], width = @summary_width, max = width - 1, indent = @summary_indent, &blk)
  blk ||= proc {|l| to << (l.index($/, -1) ? l : l + $/)}
  visit(:summarize, {}, {}, width, max, indent, &blk)
  to
end

#terminate(arg = nil) ⇒ Object

Terminates option parsing. Optional parameter arg is a string pushed back to be the first non-option argument.



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# File 'lib/optparse.rb', line 1075

def terminate(arg = nil)
  self.class.terminate(arg)
end

#to_a ⇒ Object

Returns option summary list.



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# File 'lib/optparse.rb', line 1253

def to_a; summarize("#{banner}".split(/^/)) end

#top ⇒ Object

Subject of #on / #on_head, #accept / #reject



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# File 'lib/optparse.rb', line 1199

def top
  @stack[-1]
end

#ver ⇒ Object

Returns version string from program_name, version and release.



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# File 'lib/optparse.rb', line 1180

def ver
  if v = version
    str = "#{program_name} #{[v].join('.')}"
    str << " (#{v})" if v = release
    str
  end
end

#warn(mesg = $!) ⇒ Object 



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# File 'lib/optparse.rb', line 1188

def warn(mesg = $!)
  super("#{program_name}: #{mesg}")
end