/usr/share/common-lisp/source/command-line-arguments/help.lisp is in cl-command-line-arguments 20151218-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 | #+xcvb (module (:depends-on ("pkgdcl")))
(in-package :command-line-arguments)
(defun split-sequence (sequence delimiter)
(loop
:with index = 0
:for match = (position delimiter sequence :start index)
:when (and match
(not (= index match)))
:collect (subseq sequence index match)
:when match
:do (setf index (1+ match))
:unless (or match
(= index (length sequence)))
:collect (subseq sequence index)
:while match))
(defun show-option-help (specification &key (stream *standard-output*) sort-names)
;; TODO: be clever when trying to align stuff horizontally
(loop :with *print-right-margin* = (max (or *print-right-margin* 0) 100)
:for spec :in specification :do
(destructuring-bind (names &key negation documentation negation-documentation
type optional list (initial-value nil initial-value-p) &allow-other-keys) spec
(declare (ignorable negation documentation negation-documentation type optional list))
(unless (consp names)
(setf names (list names)))
(flet ((option-names (names)
(let ((n (mapcar 'option-name names)))
(if sort-names
(stable-sort n #'< :key #'length)
n))))
(when documentation
(format stream "~& ~32A ~8A ~@<~@;~{~A~^ ~}~@:>"
(format nil "~{ ~A~}" (option-names names))
(string-downcase type)
(split-sequence documentation #\Space))
(format stream "~:[~*~; (default: ~S)~]~%" initial-value-p initial-value))
(when negation-documentation
(format stream " ~32A ~8A ~@<~@;~{~A~^ ~}~@:>~%"
(format nil "~{ ~A~}" (option-names (make-negated-names names negation)))
(string-downcase type)
(split-sequence negation-documentation #\Space)))))))
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