brew/Library/Homebrew/unpack_strategy/generic_unar.rb

module UnpackStrategy
  class GenericUnar
    include UnpackStrategy

    using Magic

    def self.extensions
      []
    end

    def self.can_extract?(_path)
      false
    end

    def dependencies
      @dependencies ||= [Formula["unar"]]
    end

    private

    def extract_to_dir(unpack_dir, basename:, verbose:)
      system_command! "unar",
                      args:    [
                        "-force-overwrite", "-quiet", "-no-directory",
                        "-output-directory", unpack_dir, "--", path
                      ],
                      env:     { "PATH" => PATH.new(Formula["unar"].opt_bin, ENV["PATH"]) },
                      verbose: verbose
    end
  end
end