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Add predicate proper-list-p

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For discussion, see emacs-devel thread starting at
https://lists.gnu.org/archive/html/emacs-devel/2018-04/msg00460.html.

* lisp/subr.el (proper-list-p): New function.
Implementation suggested by Paul Eggert <eggert@cs.ucla.edu> in
https://lists.gnu.org/archive/html/emacs-devel/2018-06/msg00138.html.
* doc/lispref/lists.texi (List Elements):
* etc/NEWS: Document proper-list-p.
* lisp/org/ob-core.el (org-babel-insert-result):
* lisp/emacs-lisp/byte-opt.el (byte-optimize-if):
* lisp/emacs-lisp/cl-macs.el (cl--make-usage-args): Use proper-list-p.
* lisp/emacs-lisp/ert.el (ert--proper-list-p): Remove.
Replaced by proper-list-p in lisp/subr.el.
(ert--explain-equal-rec): Use proper-list-length.
* lisp/format.el (format-proper-list-p): Remove.
Replaced by proper-list-p in lisp/subr.el.
(format-annotate-single-property-change): Use proper-list-p.
* test/lisp/emacs-lisp/ert-tests.el (ert-test-proper-list-p):
Move from here...
* test/lisp/subr-tests.el (subr-tests--proper-list-length):
...to here, mutatis mutandis.
This commit is contained in:
Basil L. Contovounesios 2018-07-09 18:46:33 -07:00 • committed by Paul Eggert
parent e4ad2d1a8f
commit 2fde6275b6
10 changed files with 59 additions and 78 deletions
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2
lisp/emacs-lisp/cl-macs.el
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@ -498,7 +498,7 @@ its argument list allows full Common Lisp conventions."
;; `&aux' args aren't arguments, so let's just drop them from the
;; usage info.
(setq arglist (cl-subseq arglist 0 aux))))
(if (cdr-safe (last arglist)) ;Not a proper list.
(if (not (proper-list-p arglist))
(let* ((last (last arglist))
(tail (cdr last)))
(unwind-protect