/usr/share/maxima/5.32.1/src/getopt.lisp is in maxima-src 5.32.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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;;;; *************************************************************************
;;;; FILE IDENTIFICATION
;;;;
;;;; Name: main.lisp
;;;; Purpose: Command line option processing like GNU's getopt_long
;;;; Programmer: Kevin M. Rosenberg
;;;; Date Started: Sep 2003
;;;;
;;;; $Id: getopt.lisp,v 1.1 2009-07-13 15:25:24 rtoy Exp $
;;;;
;;;; *************************************************************************
;;;; This file has been modified from the original to support the
;;;; needs of maxima. Basically, we changed getopt so that:
;;;;
;;;; - "-ab" is recognized as two separate options: "-a" "-b"
;;;;
;;;; - Exact matches are treated as matches, even if the match is an
;;;; ambiguous prefix. Hence, "--batch" will match the option
;;;; "--batch", even though it is an ambiguous prefix for
;;;; "--batch-lisp" and "--batch--string". But "--bat" is still an
;;;; error since it is ambiguous and is not an exact match for any
;;;; option.
;;;;
;;;; To comply with the license, we include the license here:
;;;;
;;;; *************************************************************************
;;;; Copyright (C) 2003 by Kevin M. Rosenberg.
;;;;
;;;; All rights reserved.
;;;;
;;;; Redistribution and use in source and binary forms, with or without
;;;; modification, are permitted provided that the following conditions
;;;; are met:
;;;; 1. Redistributions of source code must retain the above copyright
;;;; notice, this list of conditions and the following disclaimer.
;;;; 2. Redistributions in binary form must reproduce the above copyright
;;;; notice, this list of conditions and the following disclaimer in the
;;;; documentation and/or other materials provided with the distribution.
;;;; 3. Neither the name of the author nor the names of the contributors
;;;; may be used to endorse or promote products derived from this software
;;;; without specific prior written permission.
;;;;
;;;; THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
;;;; ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
;;;; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
;;;; ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
;;;; FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
;;;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
;;;; OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
;;;; HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
;;;; LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
;;;; OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
;;;; SUCH DAMAGE.
;;;; *************************************************************************
(in-package #-gcl #:getopt #+gcl "GETOPT")
(defun is-short-option (arg)
(and (>= (length arg) 2)
(char= #\- (schar arg 0))
(char/= #\- (schar arg 1))))
(defun is-option-terminator (arg)
(and (= 2 (length arg))
(char= #\- (schar arg 0))
(char= #\- (schar arg 1))))
(defun is-long-option (arg)
(and (> (length arg) 2)
(char= #\- (schar arg 0))
(char= #\- (schar arg 1))
(char/= #\- (schar arg 2))))
(defun decompose-arg (arg option-type)
"Returns base-name,argument"
(let ((start (ecase option-type
(:long 2)
(:short 1)))
(name-end (position #\= arg)))
(values (subseq arg start name-end)
(when name-end (subseq arg (1+ name-end))))))
(defun analyze-arg (arg)
"Analyzes an argument. Returns option-type,base-name,argument"
(let* ((option-type (cond ((is-short-option arg) :short)
((is-long-option arg) :long)
(t :arg))))
(if (or (eq option-type :short) (eq option-type :long))
(multiple-value-bind (base arg) (decompose-arg arg option-type)
(values option-type base arg))
(values :arg arg nil))))
(defun find-option (name options &key allow-exact-match)
"Find an option in option list. Handles using unique abbreviations"
(let* ((option-names (mapcar #'car options))
(pos (match-unique-abbreviation name option-names :allow-exact-match allow-exact-match)))
(when pos
(nth pos options))))
(defun match-option (arg options &key allow-exact-match)
"Matches an argument to an option. Returns option-list,option-type,base-name,argument"
(multiple-value-bind (option-type base-name argument) (analyze-arg arg)
(let ((match (find-option base-name options :allow-exact-match allow-exact-match)))
(values match option-type (when match (car match)) argument))))
;;; EXPORTED functions
(defun match-unique-abbreviation (abbr strings &key (allow-exact-match nil))
"Returns position of ABBR in STRINGS. ABBR may be a unique abbreviation.
Returns NIL if no match found."
(let ((len (length abbr))
(matches nil))
(dotimes (i (length strings))
(let* ((s (nth i strings))
(l (length s)))
(cond
((= len l)
(when (string= abbr s)
(if allow-exact-match
(return-from match-unique-abbreviation i)
(push (cons s i) matches))))
((< len l)
(when (string= abbr (subseq s 0 len))
(push (cons s i) matches))))))
(when (= 1 (length matches))
(cdr (first matches)))))
(defun getopt (args options &key allow-exact-match)
"Processes a list of arguments and options. Returns three values:
- Non-option arguments
- An alist of options consisting of the option name and the value, if any
- A list of any option names that were not recognized
options is a list of option lists. The fields of the list are
- NAME name of the long option
- HAS-ARG with legal values of :NONE, :REQUIRED, :OPTIONAL
- VAL value to return for a option with no arguments"
(do ((pos args (cdr pos))
(finished-options)
(out-opts)
(out-args)
(errors))
((null pos) (values (nreverse out-args) (nreverse out-opts) errors))
(cond
(finished-options
(push (car pos) out-args))
((is-option-terminator (car pos))
(setq finished-options t))
(t
(let ((arg (car pos)))
(multiple-value-bind (option-list option-type base-name argument)
(match-option (car pos) options :allow-exact-match allow-exact-match)
(cond
((and option-list (not (eq option-type :arg)))
(cond
(argument
(case (second option-list)
(:none
(push base-name errors))
(t
(push (cons base-name argument) out-opts))))
((null argument)
(if (and (eq :required (second option-list)) (null (cdr pos)))
(push base-name errors)
(case (second option-list)
(:none
(push (cons base-name (third option-list)) out-opts))
(:required
;; Next arg is the value.
(push (cons base-name (second pos)) out-opts)
(setf pos (cdr pos)))
(:optional
;; Optional arg. If the next arg is an option
;; arg, we use the default value. Otherwise we
;; use the next arg as the value.
(if (or (is-short-option (second pos))
(is-long-option (second pos)))
(push (cons base-name (third option-list)) out-opts)
(progn
(push (cons base-name (second pos)) out-opts)
(setf pos (cdr pos))))))))))
(t
(cond ((eq :long option-type)
(push (nth-value 0 (decompose-arg arg option-type)) errors))
((eq :short option-type)
(cond ((<= (length (car pos)) 2)
;; Unrecognized short option (one character)
(push (nth-value 0 (decompose-arg arg option-type)) errors))
(t
;; We have option that's not matched, but
;; looks like a short option like "-abc".
;; Expand this to '("-a" "-b" "-c") and
;; effectively replace "-abc" with the
;; replacement. We setf the cdr because
;; the do loop will remove "-abc" for us.
(setf (cdr pos)
(append (map 'list
#'(lambda (x)
(concatenate 'string "-" (string x)))
(subseq (car pos) 1))
(cdr pos))))))
(t
(push arg out-args)))))))))))
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