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# optparse.rb - command-line option analysis with the OptionParser class.

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# Author:: Nobu Nakada

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# Documentation:: Nobu Nakada and Gavin Sinclair.

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# See OptionParser for documentation.

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#--

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# == Developer Documentation (not for RDoc output)

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# === Class tree

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# - OptionParser:: front end

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# - OptionParser::Switch:: each switches

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# - OptionParser::List:: options list

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# - OptionParser::ParseError:: errors on parsing

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# - OptionParser::AmbiguousOption

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# - OptionParser::NeedlessArgument

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# - OptionParser::MissingArgument

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# - OptionParser::InvalidOption

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# - OptionParser::InvalidArgument

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# - OptionParser::AmbiguousArgument

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# === Object relationship diagram

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# +--------------+

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# | OptionParser |<>-----+

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# +--------------+ | +--------+

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# | ,-| Switch |

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# on_head -------->+---------------+ / +--------+

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# accept/reject -->| List |<|>-

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# | |<|>- +----------+

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# on ------------->+---------------+ `-| argument |

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# : : | class |

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# +---------------+ |==========|

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# on_tail -------->| | |pattern |

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# +---------------+ |----------|

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# OptionParser.accept ->| DefaultList | |converter |

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# reject |(shared between| +----------+

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# | all instances)|

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# +---------------+

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#++

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# == OptionParser

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# === Introduction

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# OptionParser is a class for command-line option analysis. It is much more

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# advanced, yet also easier to use, than GetoptLong, and is a more Ruby-oriented

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# solution.

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# === Features

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

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# same place.

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

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# separately.

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# 3. Optional and mandatory arguments are specified very gracefully.

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

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# 5. Arguments can be restricted to a certain set.

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# All of these features are demonstrated in the examples below. See

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# #make_switch for full documentation.

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# === Minimal example

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# require 'optparse'

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# options = {}

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# OptionParser.new do |opts|

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# opts.banner = "Usage: example.rb [options]"

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# opts.on("-v", "--[no-]verbose", "Run verbosely") do |v|

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# options[:verbose] = v

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# end

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# end.parse!

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# p options

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# p ARGV

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# === Generating Help

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

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# write:

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# require 'optparse'

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# Options = Struct.new(:name)

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# class Parser

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# def self.parse(options)

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# args = Options.new("world")

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# opt_parser = OptionParser.new do |opts|

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# opts.banner = "Usage: example.rb [options]"

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

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# args.name = n

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# end

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# opts.on("-h", "--help", "Prints this help") do

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# puts opts

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# exit

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# end

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# end

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# opt_parser.parse!(options)

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# return args

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# end

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# end

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# options = Parser.parse %w[--help]

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# #=>

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# # Usage: example.rb [options]

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# # -n, --name=NAME Name to say hello to

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# # -h, --help Prints this help#

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# === Complete example

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# The following example is a complete Ruby program. You can run it and see the

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# effect of specifying various options. This is probably the best way to learn

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# the features of +optparse+.

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# require 'optparse'

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# require 'optparse/time'

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# require 'ostruct'

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# require 'pp'

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# class OptparseExample

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# CODES = %w[iso-2022-jp shift_jis euc-jp utf8 binary]

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# CODE_ALIASES = { "jis" => "iso-2022-jp", "sjis" => "shift_jis" }

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# #

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# # Return a structure describing the options.

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# #

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# def self.parse(args)

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# # The options specified on the command line will be collected in *options*.

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# # We set default values here.

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# options = OpenStruct.new

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# options.library = []

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# options.inplace = false

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# options.encoding = "utf8"

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# options.transfer_type = :auto

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# options.verbose = false

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# opt_parser = OptionParser.new do |opts|

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# opts.banner = "Usage: example.rb [options]"

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# opts.separator ""

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# opts.separator "Specific options:"

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# # Mandatory argument.

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# opts.on("-r", "--require LIBRARY",

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# "Require the LIBRARY before executing your script") do |lib|

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# options.library << lib

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# end

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# # Optional argument; multi-line description.

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# opts.on("-i", "--inplace [EXTENSION]",

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# "Edit ARGV files in place",

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# " (make backup if EXTENSION supplied)") do |ext|

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# options.inplace = true

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# options.extension = ext || ''

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# options.extension.sub!(/\A\.?(?=.)/, ".") # Ensure extension begins with dot.

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# end

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# # Cast 'delay' argument to a Float.

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# opts.on("--delay N", Float, "Delay N seconds before executing") do |n|

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# options.delay = n

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# end

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# # Cast 'time' argument to a Time object.

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# opts.on("-t", "--time [TIME]", Time, "Begin execution at given time") do |time|

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# options.time = time

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# end

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# # Cast to octal integer.

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# opts.on("-F", "--irs [OCTAL]", OptionParser::OctalInteger,

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# "Specify record separator (default \\0)") do |rs|

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# options.record_separator = rs

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# end

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# # List of arguments.

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# opts.on("--list x,y,z", Array, "Example 'list' of arguments") do |list|

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# options.list = list

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# end

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# # Keyword completion. We are specifying a specific set of arguments (CODES

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# # and CODE_ALIASES - notice the latter is a Hash), and the user may provide

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# # the shortest unambiguous text.

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# code_list = (CODE_ALIASES.keys + CODES).join(',')

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# opts.on("--code CODE", CODES, CODE_ALIASES, "Select encoding",

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# " (#{code_list})") do |encoding|

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# options.encoding = encoding

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# end

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# # Optional argument with keyword completion.

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# opts.on("--type [TYPE]", [:text, :binary, :auto],

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# "Select transfer type (text, binary, auto)") do |t|

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# options.transfer_type = t

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# end

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# # Boolean switch.

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# opts.on("-v", "--[no-]verbose", "Run verbosely") do |v|

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# options.verbose = v

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# end

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# opts.separator ""

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# opts.separator "Common options:"

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# # No argument, shows at tail. This will print an options summary.

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# # Try it and see!

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# opts.on_tail("-h", "--help", "Show this message") do

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# puts opts

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# exit

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# end

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# # Another typical switch to print the version.

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# opts.on_tail("--version", "Show version") do

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# puts ::Version.join('.')

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# exit

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# end

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# end

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# opt_parser.parse!(args)

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# options

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# end # parse()

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# end # class OptparseExample

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# options = OptparseExample.parse(ARGV)

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# pp options

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# pp ARGV

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# === Shell Completion

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# For modern shells (e.g. bash, zsh, etc.), you can use shell

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# completion for command line options.

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# === Further documentation

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# The above examples should be enough to learn how to use this class. If you

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# have any questions, file a ticket at http://bugs.ruby-lang.org.

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class OptionParser

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# :stopdoc:

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NoArgument = [NO_ARGUMENT = :NONE, nil].freeze

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RequiredArgument = [REQUIRED_ARGUMENT = :REQUIRED, true].freeze

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OptionalArgument = [OPTIONAL_ARGUMENT = :OPTIONAL, false].freeze

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# :startdoc:

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# Keyword completion module. This allows partial arguments to be specified

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# and resolved against a list of acceptable values.

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module Completion

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def self.regexp(key, icase)

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Regexp.new('\A' + Regexp.quote(key).gsub(/\w+\b/, '\&\w*'), icase)

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end

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def self.candidate(key, icase = false, pat = nil, &block)

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pat ||= Completion.regexp(key, icase)

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candidates = []

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block.call do |k, *v|

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(if Regexp === k

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kn = "".freeze

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k === key

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else

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kn = defined?(k.id2name) ? k.id2name : k

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pat === kn

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end) or next

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v << k if v.empty?

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candidates << [k, v, kn]

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end

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candidates

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end

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def candidate(key, icase = false, pat = nil)

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Completion.candidate(key, icase, pat, &method(:each))

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end

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public

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def complete(key, icase = false, pat = nil)

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candidates = candidate(key, icase, pat, &method(:each)).sort_by {|k, v, kn| kn.size}

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if candidates.size == 1

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canon, sw, * = candidates[0]

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elsif candidates.size > 1

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canon, sw, cn = candidates.shift

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candidates.each do |k, v, kn|

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next if sw == v

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if String === cn and String === kn

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if cn.rindex(kn, 0)

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canon, sw, cn = k, v, kn

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elsif kn.rindex(cn, 0)

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end

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end

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throw :ambiguous, key

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end

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end

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if canon

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block_given? or return key, *sw

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yield(key, *sw)

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end

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end

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def convert(opt = nil, val = nil, *)

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val

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end

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end

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# Map from option/keyword string to object with completion.

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class OptionMap < Hash

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include Completion

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end

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# Individual switch class. Not important to the user.

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# Defined within Switch are several Switch-derived classes: NoArgument,

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# RequiredArgument, etc.

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class Switch

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attr_reader :pattern, :conv, :short, :long, :arg, :desc, :block

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# Guesses argument style from +arg+. Returns corresponding

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# OptionParser::Switch class (OptionalArgument, etc.).

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def self.guess(arg)

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case arg

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when ""

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t = self

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when /\A=?\[/

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t = Switch::OptionalArgument

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when /\A\s+\[/

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t = Switch::PlacedArgument

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else

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t = Switch::RequiredArgument

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end

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self >= t or incompatible_argument_styles(arg, t)

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end

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def self.incompatible_argument_styles(arg, t)

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raise(ArgumentError, "#{arg}: incompatible argument styles\n #{self}, #{t}",

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ParseError.filter_backtrace(caller(2)))

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end

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def self.pattern

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NilClass

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end

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def initialize(pattern = nil, conv = nil,

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short = nil, long = nil, arg = nil,

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desc = ([] if short or long), block = Proc.new)

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raise if Array === pattern

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@pattern, @conv, @short, @long, @arg, @desc, @block =

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pattern, conv, short, long, arg, desc, block

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end

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# Parses +arg+ and returns rest of +arg+ and matched portion to the

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# argument pattern. Yields when the pattern doesn't match substring.

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def parse_arg(arg)

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pattern or return nil, [arg]

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unless m = pattern.match(arg)

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yield(InvalidArgument, arg)

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return arg, []

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end

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if String === m

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m = [s = m]

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else

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m = m.to_a

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s = m[0]

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return nil, m unless String === s

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end

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raise InvalidArgument, arg unless arg.rindex(s, 0)

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return nil, m if s.length == arg.length

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yield(InvalidArgument, arg) # didn't match whole arg

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return arg[s.length..-1], m

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end

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private :parse_arg

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# Parses argument, converts and returns +arg+, +block+ and result of

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# conversion. Yields at semi-error condition instead of raising an

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# exception.

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def conv_arg(arg, val = [])

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if conv

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val = conv.call(*val)

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else

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val = proc {|v| v}.call(*val)

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end

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return arg, block, val

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end

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private :conv_arg

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# Produces the summary text. Each line of the summary is yielded to the

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# block (without newline).

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# +sdone+:: Already summarized short style options keyed hash.

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# +ldone+:: Already summarized long style options keyed hash.

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# +width+:: Width of left side (option part). In other words, the right

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# side (description part) starts after +width+ columns.

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# +max+:: Maximum width of left side -> the options are filled within

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# +max+ columns.

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# +indent+:: Prefix string indents all summarized lines.

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def summarize(sdone = [], ldone = [], width = 1, max = width - 1, indent = "")

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sopts, lopts = [], [], nil

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@short.each {|s| sdone.fetch(s) {sopts << s}; sdone[s] = true} if @short

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@long.each {|s| ldone.fetch(s) {lopts << s}; ldone[s] = true} if @long

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return if sopts.empty? and lopts.empty? # completely hidden

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left = [sopts.join(', ')]

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right = desc.dup

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while s = lopts.shift

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l = left[-1].length + s.length

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l += arg.length if left.size == 1 && arg

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l < max or sopts.empty? or left << ''

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left[-1] << if left[-1].empty? then ' ' * 4 else ', ' end << s

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end

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if arg

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left[0] << (left[1] ? arg.sub(/\A(\[?)=/, '\1') + ',' : arg)

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end

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mlen = left.collect {|ss| ss.length}.max.to_i

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while mlen > width and l = left.shift

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mlen = left.collect {|ss| ss.length}.max.to_i if l.length == mlen

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if l.length < width and (r = right[0]) and !r.empty?

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l = l.to_s.ljust(width) + ' ' + r

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right.shift

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end

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yield(indent + l)

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end

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while begin l = left.shift; r = right.shift; l or r end

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l = l.to_s.ljust(width) + ' ' + r if r and !r.empty?

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yield(indent + l)

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end

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self

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end

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def add_banner(to) # :nodoc:

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unless @short or @long

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s = desc.join

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to << " [" + s + "]..." unless s.empty?

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end

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end

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def match_nonswitch?(str) # :nodoc:

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@pattern =~ str unless @short or @long

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end

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# Main name of the switch.

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def switch_name

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(long.first || short.first).sub(/\A-+(?:\[no-\])?/, '')

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end

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def compsys(sdone, ldone) # :nodoc:

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sopts, lopts = [], []

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@short.each {|s| sdone.fetch(s) {sopts << s}; sdone[s] = true} if @short

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@long.each {|s| ldone.fetch(s) {lopts << s}; ldone[s] = true} if @long

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return if sopts.empty? and lopts.empty? # completely hidden

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(sopts+lopts).each do |opt|

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# "(-x -c -r)-l[left justify]" \

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if /^--\[no-\](.+)$/ =~ opt

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o = $1

[487] Fix | Delete

yield("--#{o}", desc.join(""))

[488] Fix | Delete

yield("--no-#{o}", desc.join(""))

[489] Fix | Delete

else

[490] Fix | Delete

yield("#{opt}", desc.join(""))

[491] Fix | Delete

end

[492] Fix | Delete

end

[493] Fix | Delete

end

[494] Fix | Delete

[495] Fix | Delete

[496] Fix | Delete

# Switch that takes no arguments.

[497] Fix | Delete

[498] Fix | Delete

class NoArgument < self

[499] Fix | Delete

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