[Chicken-users] Bug with #:optional in args egg?

[Diego A. Mundo]

With the example on the args eggref (http://wiki.call-cc.org/eggref/4/args#examples) slightly modified to this:

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#!/usr/local/bin/csi -script

(use args)

(define opts

  (list (args:make-option (c cookie)    #:none     "give me cookie"

                          (print "cookie was tasty"))

        (args:make-option (d depth)     #:optional    "debug level [default: 1]"

                          (print "depth: arg is " arg))

        (args:make-option (e elephant)  #:required "flatten the argument"

                          (print "elephant: arg is " arg))

        (args:make-option (f file)      (required: "NAME")   "parse file NAME")

        (args:make-option (v V version) #:none     "Display version"

                          (print "args-example $Revision: 1.3 $")

                          (exit))

        (args:make-option (abc)         #:none     "Recite the alphabet")

        (args:make-option (h help)      #:none     "Display this text"

                          (usage))))

(define (usage)

  (with-output-to-port (current-error-port)

    (lambda ()

      (print "Usage: " (car (argv)) " [options...] [files...]")

      (newline)

      (print (args:usage opts))

      (print "Report bugs to zbigniewsz at gmail.")))

  (exit 1))

(receive (options operands)

    (args:parse (command-line-arguments) opts)

  (print options))

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You can see how the behavior of using required arguments (-e or --elephant) differs from using optional arguments (-d or --depth). More specifically, -e and --elephant work, parsing their arguments as expected, whereas -d produces #f except when the option is passed directly after the flag with no spaces (-d10, for example), and --depth always returns #f.

Running Ubuntu 17.04

chicken -version:

(c) 2008-2017, The CHICKEN Team

(c) 2000-2007, Felix L. Winkelmann

Version 4.12.0 (rev 6ea24b6)

linux-unix-gnu-x86-64 [ 64bit manyargs dload ptables ]

compiled 2017-02-19 on yves.more-magic.net (Linux)