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Mode for accepting all unknown options #38

@rafaelfranca

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@rafaelfranca

I'm writing a proxy-like option parser using this library so I could parse a few new options in my parser, but redirect anything else that isn't know to the next command. It seems this use case is not supported yet.

As example, think in a wrapper for the minitest command.

class TestRunner
  def self.run(argv)
    new(argv).run
  end

  def initialize(argv)
    @argv = argv
    @options = {}
    @parser = OptionParser.new do |parser|
      parser.banner = "Usage: bin/test [path or build number]"

      parser.on("--record-deprecations", "Record deprecations") do |r|
        @options[:record_deprecations] = r
      end

      parser.on("--include-branch-commits", "Include branch commits") do |i|
        @options[:include_branch_commits] = i
      end
    end
  end

  def run
    @parser.parse(@argv)
     env = {}
     if @options[:record_deprecations]
      env["RECORD_DEPRECATIONS"] = "true"
    end

     exec(env, "bin/rails", "test", *@argv)
end

when running bin/test some_file.rb --record-deprecations --seed 2345 currently I get:

invalid option: --seed (OptionParser::InvalidOption)
        from bin/test:8:in `run'
        from bin/test:94:in `<main>'

I want to just keep unknown options inside @argv like we do with unknown arguments.

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