class OptionParser
OptionParser
¶ ↑
New to OptionParser?¶ ↑
See the Tutorial.
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¶ ↑
-
The argument specification and the code to handle it are written in the same place.
-
It can output an option summary; you don’t need to maintain this string separately.
-
Optional and mandatory arguments are specified very gracefully.
-
Arguments can be automatically converted to a specified class.
-
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 |parser| parser.banner = "Usage: example.rb [options]" parser.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 |parser| parser.banner = "Usage: example.rb [options]" parser.on("-nNAME", "--name=NAME", "Name to say hello to") do |n| args.name = n end parser.on("-h", "--help", "Prints this help") do puts parser 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:
$ ruby optparse-test.rb -r optparse-test.rb:9:in `<main>': missing argument: -r (OptionParser::MissingArgument) $ 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 byDate.parse
-
DateTime
– Anything accepted byDateTime.parse
-
Time
– Anything accepted byTime.httpdate
orTime.parse
-
URI
– Anything accepted byURI.parse
-
Shellwords
– Anything accepted byShellwords.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
– LikeInteger
, but no octal format. -
OctalInteger
– LikeInteger
, but no decimal format. -
DecimalNumeric
– Decimal integer or float. -
TrueClass
– Accepts ‘+, yes, true, -, no, false’ and defaults astrue
-
FalseClass
– Same asTrueClass
, but defaults tofalse
-
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 below.
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:
$ ruby optparse-test.rb -t nonsense ... invalid argument: -t nonsense (OptionParser::InvalidArgument) $ ruby optparse-test.rb -t 10-11-12 2010-11-12 00:00:00 -0500 $ 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!
Used:
$ ruby optparse-test.rb --user 1 #<struct User id=1, name="Sam"> $ ruby optparse-test.rb --user 2 #<struct User id=2, name="Gandalf"> $ ruby optparse-test.rb --user 3 optparse-test.rb:15:in `block in find_user': No User Found for id 3 (RuntimeError)
Store options to a Hash
¶ ↑
The into
option of order
, parse
and so on methods stores command line options into a Hash
.
require 'optparse' options = {} OptionParser.new do |parser| parser.on('-a') parser.on('-b NUM', Integer) parser.on('-v', '--verbose') end.parse!(into: options) p options
Used:
$ ruby optparse-test.rb -a {:a=>true} $ ruby optparse-test.rb -a -v {:a=>true, :verbose=>true} $ ruby optparse-test.rb -a -b 100 {:a=>true, :b=>100}
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, :extension, :delay, :time, :record_separator, :list def initialize self.library = [] self.inplace = false self.encoding = "utf8" self.transfer_type = :auto self.verbose = false end def define_options(parser) parser.banner = "Usage: example.rb [options]" parser.separator "" parser.separator "Specific options:" # add additional options perform_inplace_option(parser) delay_execution_option(parser) execute_at_time_option(parser) specify_record_separator_option(parser) list_example_option(parser) specify_encoding_option(parser) optional_option_argument_with_keyword_completion_option(parser) boolean_verbose_option(parser) 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 def perform_inplace_option(parser) # Specifies an optional option argument parser.on("-i", "--inplace [EXTENSION]", "Edit ARGV files in place", "(make backup if EXTENSION supplied)") do |ext| self.inplace = true self.extension = ext || '' self.extension.sub!(/\A\.?(?=.)/, ".") # Ensure extension begins with dot. end end def delay_execution_option(parser) # Cast 'delay' argument to a Float. parser.on("--delay N", Float, "Delay N seconds before executing") do |n| self.delay = n end end def execute_at_time_option(parser) # Cast 'time' argument to a Time object. parser.on("-t", "--time [TIME]", Time, "Begin execution at given time") do |time| self.time = time end end def specify_record_separator_option(parser) # Cast to octal integer. parser.on("-F", "--irs [OCTAL]", OptionParser::OctalInteger, "Specify record separator (default \\0)") do |rs| self.record_separator = rs end end def list_example_option(parser) # List of arguments. parser.on("--list x,y,z", Array, "Example 'list' of arguments") do |list| self.list = list end end def specify_encoding_option(parser) # 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| self.encoding = encoding end end def optional_option_argument_with_keyword_completion_option(parser) # Optional '--type' option argument with keyword completion. parser.on("--type [TYPE]", [:text, :binary, :auto], "Select transfer type (text, binary, auto)") do |t| self.transfer_type = t end end def boolean_verbose_option(parser) # Boolean switch. parser.on("-v", "--[no-]verbose", "Run verbosely") do |v| self.verbose = v end end end # # Return a structure describing the options. # def parse(args) # The options specified on the command line will be collected in # *options*. @options = ScriptOptions.new @args = OptionParser.new do |parser| @options.define_options(parser) parser.parse!(args) end @options end attr_reader :parser, :options end # class OptparseExample example = OptparseExample.new options = example.parse(ARGV) pp options # example.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, along with the accompanying Tutorial, should be enough to learn how to use this class. If you have any questions, file a ticket at bugs.ruby-lang.org.
Constants
Attributes
Strings to be parsed in default.
Program name to be emitted in error message and default banner, defaults to $0.
Whether to raise at unknown option.
Release code
Whether to require that options match exactly (disallows providing abbreviated long option as short option).
Program name to be emitted in error message and default banner, defaults to $0.
Width for option list portion of summary. Must be Numeric
.
Width for option list portion of summary. Must be Numeric
.
Public Class Methods
See accept
.
# File lib/optparse.rb, line 1190 def self.accept(*args, &blk) top.accept(*args, &blk) end
# File lib/optparse/version.rb, line 50 def each_const(path, base = ::Object) path.split(/::|\//).inject(base) do |klass, name| raise NameError, path unless Module === klass klass.constants.grep(/#{name}/i) do |c| klass.const_defined?(c) or next klass.const_get(c) end end end
See getopts
.
# File lib/optparse.rb, line 1813 def self.getopts(*args) new.getopts(*args) end
Returns an incremented value of default
according to arg
.
# File lib/optparse.rb, line 1124 def self.inc(arg, default = nil) case arg when Integer arg.nonzero? when nil default.to_i + 1 end end
Initializes the instance and yields itself if called with a block.
banner
-
Banner message.
width
-
Summary width.
indent
-
Summary indent.
# File lib/optparse.rb, line 1143 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 @require_exact = false @raise_unknown = true add_officious yield self if block_given? end
See reject
.
# File lib/optparse.rb, line 1203 def self.reject(*args, &blk) top.reject(*args, &blk) end
# File lib/optparse/version.rb, line 60 def search_const(klass, name) klasses = [klass] while klass = klasses.shift klass.constants.each do |cname| klass.const_defined?(cname) or next const = klass.const_get(cname) yield klass, cname, const if name === cname klasses << const if Module === const and const != ::Object end end end
# File lib/optparse/version.rb, line 5 def show_version(*pkgs) progname = ARGV.options.program_name result = false show = proc do |klass, cname, version| str = "#{progname}" unless klass == ::Object and cname == :VERSION version = version.join(".") if Array === version str << ": #{klass}" unless klass == Object str << " version #{version}" end [:Release, :RELEASE].find do |rel| if klass.const_defined?(rel) str << " (#{klass.const_get(rel)})" end end puts str result = true end if pkgs.size == 1 and pkgs[0] == "all" self.search_const(::Object, /\AV(?:ERSION|ersion)\z/) do |klass, cname, version| unless cname[1] == ?e and klass.const_defined?(:Version) show.call(klass, cname.intern, version) end end else pkgs.each do |pkg| begin pkg = pkg.split(/::|\//).inject(::Object) {|m, c| m.const_get(c)} v = case when pkg.const_defined?(:Version) pkg.const_get(n = :Version) when pkg.const_defined?(:VERSION) pkg.const_get(n = :VERSION) else n = nil "unknown" end show.call(pkg, n, v) rescue NameError end end end result end
# File lib/optparse.rb, line 1170 def self.terminate(arg = nil) throw :terminate, arg end
# File lib/optparse.rb, line 1175 def self.top() DefaultList end
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.
# File lib/optparse.rb, line 1115 def self.with(*args, &block) opts = new(*args) opts.instance_eval(&block) opts end
Public Instance Methods
Kernel#abort
# File lib/optparse.rb, line 1291 def abort(mesg = $!) super("#{program_name}: #{mesg}") end
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)
# File lib/optparse.rb, line 1186 def accept(*args, &blk) top.accept(*args, &blk) end
Returns additional info.
# File lib/optparse.rb, line 1864 def additional_message(typ, opt) return unless typ and opt and defined?(DidYouMean::SpellChecker) all_candidates = [] visit(:get_candidates, typ) do |candidates| all_candidates.concat(candidates) end all_candidates.select! {|cand| cand.is_a?(String) } checker = DidYouMean::SpellChecker.new(dictionary: all_candidates) DidYouMean.formatter.message_for(all_candidates & checker.correct(opt)) end
Subject of on_tail
.
# File lib/optparse.rb, line 1305 def base @stack[1] end
# File lib/optparse.rb, line 1875 def candidate(word) list = [] case word when '-' long = short = true when /\A--/ word, arg = word.split(/=/, 2) argpat = Completion.regexp(arg, false) if arg and !arg.empty? long = true when /\A-/ short = true end pat = Completion.regexp(word, long) 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
Creates an option from the given parameters params
. See Parameters for New Options.
The block, if given, is the handler for the created option. When the option is encountered during command-line parsing, the block is called with the argument given for the option, if any. See Option Handlers.
# File lib/optparse.rb, line 1540 def define(*opts, &block) top.append(*(sw = make_switch(opts, block))) sw[0] end
Creates an option from the given parameters params
. See Parameters for New Options.
The block, if given, is the handler for the created option. When the option is encountered during command-line parsing, the block is called with the argument given for the option, if any. See Option Handlers.
# File lib/optparse/kwargs.rb, line 10 def define_by_keywords(options, meth, **opts) meth.parameters.each do |type, name| case type when :key, :keyreq op, cl = *(type == :key ? %w"[ ]" : ["", ""]) define("--#{name}=#{op}#{name.upcase}#{cl}", *opts[name]) do |o| options[name] = o end end end options end
Creates an option from the given parameters params
. See Parameters for New Options.
The block, if given, is the handler for the created option. When the option is encountered during command-line parsing, the block is called with the argument given for the option, if any. See Option Handlers.
# File lib/optparse.rb, line 1561 def define_head(*opts, &block) top.prepend(*(sw = make_switch(opts, block))) sw[0] end
Creates an option from the given parameters params
. See Parameters for New Options.
The block, if given, is the handler for the created option. When the option is encountered during command-line parsing, the block is called with the argument given for the option, if any. See Option Handlers.
# File lib/optparse.rb, line 1584 def define_tail(*opts, &block) base.append(*(sw = make_switch(opts, block))) sw[0] end
Parses environment variable env
or its uppercase with splitting like a shell.
env
defaults to the basename of the program.
# File lib/optparse.rb, line 1948 def environment(env = File.basename($0, '.*')) env = ENV[env] || ENV[env.upcase] or return require 'shellwords' parse(*Shellwords.shellwords(env)) end
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
# File lib/optparse.rb, line 1778 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
Returns option summary string.
# File lib/optparse.rb, line 1347 def help; summarize("#{banner}".sub(/\n?\z/, "\n")) end
# File lib/optparse.rb, line 1132 def inc(*args) self.class.inc(*args) end
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, then the basename with ‘.options’ suffix under XDG and Haiku standard places.
The optional into
keyword argument works exactly like that accepted in method parse
.
# File lib/optparse.rb, line 1916 def load(filename = nil, into: nil) unless filename basename = File.basename($0, '.*') return true if load(File.expand_path(basename, '~/.options'), into: into) rescue nil basename << ".options" return [ # XDG ENV['XDG_CONFIG_HOME'], '~/.config', *ENV['XDG_CONFIG_DIRS']&.split(File::PATH_SEPARATOR), # Haiku '~/config/settings', ].any? {|dir| next if !dir or dir.empty? load(File.expand_path(basename, dir), into: into) rescue nil } end begin parse(*File.readlines(filename, chomp: true), into: into) true rescue Errno::ENOENT, Errno::ENOTDIR false end end
Creates an option from the given parameters params
. See Parameters for New Options.
The block, if given, is the handler for the created option. When the option is encountered during command-line parsing, the block is called with the argument given for the option, if any. See Option Handlers.
# File lib/optparse.rb, line 1402 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 has_arg = false 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}" (q = q.downcase).tr!('_', '-') long << "no-#{q}" 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}" (o = q.downcase).tr!('_', '-') long << o 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}" (o = q.downcase).tr!('_', '-') long << o 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 else has_arg = true 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) if o && !o.empty? end end default_pattern, conv = search(:atype, default_style.pattern) unless default_pattern if !(short.empty? and long.empty?) if has_arg and default_style == Switch::NoArgument default_style = Switch::RequiredArgument end 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
Pushes a new List
.
# File lib/optparse.rb, line 1312 def new @stack.push(List.new) if block_given? yield self else self end end
Creates an option from the given parameters params
. See Parameters for New Options.
The block, if given, is the handler for the created option. When the option is encountered during command-line parsing, the block is called with the argument given for the option, if any. See Option Handlers.
# File lib/optparse.rb, line 1550 def on(*opts, &block) define(*opts, &block) self end
Creates an option from the given parameters params
. See Parameters for New Options.
The block, if given, is the handler for the created option. When the option is encountered during command-line parsing, the block is called with the argument given for the option, if any. See Option Handlers.
The new option is added at the head of the summary.
# File lib/optparse.rb, line 1573 def on_head(*opts, &block) define_head(*opts, &block) self end
Creates an option from the given parameters params
. See Parameters for New Options.
The block, if given, is the handler for the created option. When the option is encountered during command-line parsing, the block is called with the argument given for the option, if any. See Option Handlers.
The new option is added at the tail of the summary.
# File lib/optparse.rb, line 1597 def on_tail(*opts, &block) define_tail(*opts, &block) self end
Parses command line arguments argv
in order. When a block is given, each non-option argument is yielded. When optional into
keyword argument is provided, the parsed option values are stored there via []=
method (so it can be Hash
, or OpenStruct
, or other similar object).
Returns the rest of argv
left unparsed.
# File lib/optparse.rb, line 1619 def order(*argv, into: nil, &nonopt) argv = argv[0].dup if argv.size == 1 and Array === argv[0] order!(argv, into: into, &nonopt) end
Same as order
, but removes switches destructively. Non-option arguments remain in argv
.
# File lib/optparse.rb, line 1628 def order!(argv = default_argv, into: nil, &nonopt) setter = ->(name, val) {into[name.to_sym] = val} if into parse_in_order(argv, setter, &nonopt) end
Parses command line arguments argv
in order when environment variable POSIXLY_CORRECT is set, and in permutation mode otherwise. When optional into
keyword argument is provided, the parsed option values are stored there via []=
method (so it can be Hash
, or OpenStruct
, or other similar object).
# File lib/optparse.rb, line 1751 def parse(*argv, into: nil) argv = argv[0].dup if argv.size == 1 and Array === argv[0] parse!(argv, into: into) end
Same as parse
, but removes switches destructively. Non-option arguments remain in argv
.
# File lib/optparse.rb, line 1760 def parse!(argv = default_argv, into: nil) if ENV.include?('POSIXLY_CORRECT') order!(argv, into: into) else permute!(argv, into: into) end end
Parses command line arguments argv
in permutation mode and returns list of non-option arguments. When optional into
keyword argument is provided, the parsed option values are stored there via []=
method (so it can be Hash
, or OpenStruct
, or other similar object).
# File lib/optparse.rb, line 1728 def permute(*argv, into: nil) argv = argv[0].dup if argv.size == 1 and Array === argv[0] permute!(argv, into: into) end
Same as permute
, but removes switches destructively. Non-option arguments remain in argv
.
# File lib/optparse.rb, line 1737 def permute!(argv = default_argv, into: nil) nonopts = [] order!(argv, into: into, &nonopts.method(:<<)) argv[0, 0] = nonopts argv end
Program name to be emitted in error message and default banner, defaults to $0.
# File lib/optparse.rb, line 1247 def program_name @program_name || File.basename($0, '.*') end
Directs to reject specified class argument.
t
-
Argument class specifier, any object including
Class
.
reject(t)
# File lib/optparse.rb, line 1199 def reject(*args, &blk) top.reject(*args, &blk) end
Release code
# File lib/optparse.rb, line 1272 def release (defined?(@release) && @release) || (defined?(::Release) && ::Release) || (defined?(::RELEASE) && ::RELEASE) end
Removes the last List
.
# File lib/optparse.rb, line 1324 def remove @stack.pop end
Add separator in summary.
# File lib/optparse.rb, line 1606 def separator(string) top.append(string, nil, nil) end
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.
# File lib/optparse.rb, line 1337 def summarize(to = [], width = @summary_width, max = width - 1, indent = @summary_indent, &blk) nl = "\n" blk ||= proc {|l| to << (l.index(nl, -1) ? l : l + nl)} visit(:summarize, {}, {}, width, max, indent, &blk) to end
Terminates option parsing. Optional parameter arg
is a string pushed back to be the first non-option argument.
# File lib/optparse.rb, line 1167 def terminate(arg = nil) self.class.terminate(arg) end
Returns option summary list.
# File lib/optparse.rb, line 1376 def to_a; summarize("#{banner}".split(/^/)) end
Returns version string from program_name
, version and release.
# File lib/optparse.rb, line 1279 def ver if v = version str = +"#{program_name} #{[v].join('.')}" str << " (#{v})" if v = release str end end
# File lib/optparse.rb, line 1265 def version (defined?(@version) && @version) || (defined?(::Version) && ::Version) end
Kernel#warn
# File lib/optparse.rb, line 1287 def warn(mesg = $!) super("#{program_name}: #{mesg}") end