GNU bug report logs - #26910
26.0.50; Enhancement request: type-checking in customize-set-variable

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Package: emacs; Severity: wishlist; Reported by: "N. Raghavendra" <raghu@HIDDEN>; dated Sat, 13 May 2017 16:38:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Drew Adams <drew.adams@HIDDEN>
To: "N. Raghavendra" <raghu@HIDDEN>, 26910 <at> debbugs.gnu.org
Subject: RE: bug#26910: 26.0.50; Enhancement request: type-checking in
 customize-set-variable
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> I request the addition of an optional argument to
> customize-set-variable, so that, e.g.,
> (customize-set-variable OPTION VALUE "This is a comment." t)
> generates an error if VALUE is not of the type specified by
> (defcustom OPTION ...),

+1

Should it raise an error or just show a message and be ignored
(not set the value)?

How about having the new optional argument specify the behavior?

Non-nil means type-check.  The particular non-nil value:

 * `no-error' means if type-check fails just show a message (and
   do not set value).
 * any other non-nil value means raise an error

(defun customize-set-variable (variable value &optional comment type-checki=
ng)
  "...
Non-nil optional arg TYPE-CHECKING means type-check VALUE and
set the option value only if the type is appropriate.

If TYPE-CHECKING is `no-error' then display a message about the
incorrect type, but do not raise an error.  Any other non-nil
value means raise an error."

...)

> and otherwise does everything that
> (customize-set-variable OPTION VALUE "This is a comment.")
> does now.

Sounds good to me.

> I also request a similar addition to `custom-set-variables'.

I think this one is impossible, since `custom-set-variables' has
only an &rest parameter: the args are not wrapped in an explicit
list.  We cannot add an optional parameter after the &rest parameter.

In addition, `custom-set-variables' accepts an _expression_,
without evaluating it (by default) for each variable.  Unless
the optional NOW element is present - in that case we could
type-check the resulting value.

This also means that we would need to provide such control
separately for each variable passed to `custom-set-variables'.
We could do that by allowing NOW to take one or more special
non-nil values, to mean type-check after evaluating.  Probably
we would want to allow two such special type-checking values:

 If NOW is present and non-nil, then also evaluate EXP and set
 the default value for the SYMBOL to the value of EXP.  If NOW
 is the symbol `type-check' then raise an error if the result of
 evaluating EXP is not of an appropriate type.  If NOW is the
 symbol `type-check-no-error' then type-check the value of EXP
 but just show a message, instead of raising an error, when the
 value has an inappropriate type.

What about also having another function, similar to
`custom-set-variables', but which accepts an explicit list of
(SYMBOL EXP [NOW [REQUEST [COMMENT]]]) entries plus an optional
TYPE-CHECKING arg that has the effect of providing a default
type-checking behavior for all entries that have non-nil NOW.

Without non-nil arg TYPE-CHECKING it would behave just like
(apply 'custom-set-variables VARLIST), where VARLIST is the
explicit list of variable specs.

Maybe something like this:

(defun custom-set-varlist (varlist &optional type-checking)
  "Invoke `custom-set-variables' on the settings in list VARLIST.
Each such setting has the form of an argument acceptable to
`custom-set-variables'.

Non-nil optional arg TYPE-CHECKING means type-check each VARLIST
entry that has a non-nil NOW element, and set the option value
only if the type is appropriate.

The value of TYPE-CHECKING determines the default type-checking
behavior: a value of `no-error' means display messages about the
incorrect types, but do not raise an error.  Any other non-nil
value means raise an error.

The default type-checking behavior can be overridden for any
given variable by its NOW element.  If NOW is `type-check' or
`type-check-no-error' then it overrides the value of arg
TYPE-CHECKING for that variable.  If NOW is any other non-nil
value then the value of TYPE-CHECKING determines the behavior."

...)




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#26910; Package emacs. Full text available.

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From: "N. Raghavendra" <raghu@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 26.0.50; Enhancement request: type-checking in customize-set-variable
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I would like a way to set options using Emacs Lisp directly (without
interacting with customization buffers), which ensures that the :set and
:type specifications of the options are respected.  Evaluating

(customize-set-variable OPTION VALUE)

uses the :set property of OPTION, but doesn't check that VALUE has the
type specified in the

(defcustom OPTION ...)

expression.

I request the addition of an optional argument to customize-set-variable,
so that, e.g.,

(customize-set-variable OPTION VALUE "This is a comment." t)

generates an error if VALUE is not of the type specified by

(defcustom OPTION ...),

and otherwise does everything that

(customize-set-variable OPTION VALUE "This is a comment.")

does now.  I also request a similar addition to `custom-set-variables'.

----------------------------------------------------------------------

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/pkg/el-get/org-mode/lisp/ob-mscgen hides /pkg/emacs/share/emacs/26.0.50/lisp/org/ob-mscgen
/pkg/el-get/org-mode/lisp/ob-comint hides /pkg/emacs/share/emacs/26.0.50/lisp/org/ob-comint
/pkg/el-get/org-mode/lisp/ob-sqlite hides /pkg/emacs/share/emacs/26.0.50/lisp/org/ob-sqlite
/pkg/el-get/org-mode/lisp/ob-octave hides /pkg/emacs/share/emacs/26.0.50/lisp/org/ob-octave
/pkg/el-get/org-mode/lisp/org-macro hides /pkg/emacs/share/emacs/26.0.50/lisp/org/org-macro
/pkg/el-get/org-mode/lisp/ob-tangle hides /pkg/emacs/share/emacs/26.0.50/lisp/org/ob-tangle
/pkg/el-get/org-mode/lisp/org-mobile hides /pkg/emacs/share/emacs/26.0.50/lisp/org/org-mobile
/pkg/el-get/org-mode/lisp/ob-picolisp hides /pkg/emacs/share/emacs/26.0.50/lisp/org/ob-picolisp
/pkg/el-get/org-mode/lisp/ob-sql hides /pkg/emacs/share/emacs/26.0.50/lisp/org/ob-sql
/pkg/el-get/org-mode/lisp/org-ctags hides /pkg/emacs/share/emacs/26.0.50/lisp/org/org-ctags
/pkg/el-get/org-mode/lisp/org-src hides /pkg/emacs/share/emacs/26.0.50/lisp/org/org-src
/pkg/el-get/org-mode/lisp/org-mhe hides /pkg/emacs/share/emacs/26.0.50/lisp/org/org-mhe
/pkg/el-get/org-mode/lisp/ox-texinfo hides /pkg/emacs/share/emacs/26.0.50/lisp/org/ox-texinfo
/pkg/el-get/org-mode/lisp/ox-html hides /pkg/emacs/share/emacs/26.0.50/lisp/org/ox-html
/pkg/el-get/org-mode/lisp/org-rmail hides /pkg/emacs/share/emacs/26.0.50/lisp/org/org-rmail
/pkg/el-get/org-mode/lisp/ob-ditaa hides /pkg/emacs/share/emacs/26.0.50/lisp/org/ob-ditaa
/pkg/el-get/org-mode/lisp/org-loaddefs hides /pkg/emacs/share/emacs/26.0.50/lisp/org/org-loaddefs
/pkg/el-get/org-mode/lisp/org-protocol hides /pkg/emacs/share/emacs/26.0.50/lisp/org/org-protocol
/pkg/el-get/org-mode/lisp/org-datetree hides /pkg/emacs/share/emacs/26.0.50/lisp/org/org-datetree
/pkg/el-get/org-mode/lisp/org-pcomplete hides /pkg/emacs/share/emacs/26.0.50/lisp/org/org-pcomplete
/pkg/el-get/org-mode/lisp/org-habit hides /pkg/emacs/share/emacs/26.0.50/lisp/org/org-habit
/pkg/el-get/org-mode/lisp/ox-man hides /pkg/emacs/share/emacs/26.0.50/lisp/org/ox-man
/pkg/el-get/org-mode/lisp/ox-publish hides /pkg/emacs/share/emacs/26.0.50/lisp/org/ox-publish
/pkg/el-get/org-mode/lisp/ox-org hides /pkg/emacs/share/emacs/26.0.50/lisp/org/ox-org
/pkg/el-get/org-mode/lisp/ox hides /pkg/emacs/share/emacs/26.0.50/lisp/org/ox
/pkg/el-get/org-mode/lisp/ob-maxima hides /pkg/emacs/share/emacs/26.0.50/lisp/org/ob-maxima
/pkg/el-get/org-mode/lisp/org-gnus hides /pkg/emacs/share/emacs/26.0.50/lisp/org/org-gnus
/pkg/el-get/org-mode/lisp/ox-latex hides /pkg/emacs/share/emacs/26.0.50/lisp/org/ox-latex
/pkg/el-get/org-mode/lisp/org-archive hides /pkg/emacs/share/emacs/26.0.50/lisp/org/org-archive
/pkg/el-get/org-mode/lisp/org-entities hides /pkg/emacs/share/emacs/26.0.50/lisp/org/org-entities
/pkg/el-get/org-mode/lisp/ob-perl hides /pkg/emacs/share/emacs/26.0.50/lisp/org/ob-perl
/pkg/el-get/org-mode/lisp/ob-js hides /pkg/emacs/share/emacs/26.0.50/lisp/org/ob-js
/pkg/el-get/org-mode/lisp/org-plot hides /pkg/emacs/share/emacs/26.0.50/lisp/org/org-plot
/pkg/el-get/org-mode/lisp/ob-ocaml hides /pkg/emacs/share/emacs/26.0.50/lisp/org/ob-ocaml
/pkg/el-get/org-mode/lisp/org-macs hides /pkg/emacs/share/emacs/26.0.50/lisp/org/org-macs
/pkg/el-get/org-mode/lisp/org-element hides /pkg/emacs/share/emacs/26.0.50/lisp/org/org-element
/pkg/el-get/org-mode/lisp/org-eshell hides /pkg/emacs/share/emacs/26.0.50/lisp/org/org-eshell
/pkg/el-get/org-mode/lisp/org-version hides /pkg/emacs/share/emacs/26.0.50/lisp/org/org-version
/pkg/el-get/org-mode/lisp/ob-python hides /pkg/emacs/share/emacs/26.0.50/lisp/org/ob-python
/pkg/el-get/org-mode/lisp/org-install hides /pkg/emacs/share/emacs/26.0.50/lisp/org/org-install
/pkg/el-get/org-mode/lisp/org-w3m hides /pkg/emacs/share/emacs/26.0.50/lisp/org/org-w3m

Features:
(shadow gnus-cite flyspell ispell mail-extr nnir emacsbug sendmail
gnus-async gnus-ml gnus-topic nndraft nnmh utf-7 gnus-demon
my-ypldap-org-contacts my-ypldap-org-contacts-helper org-contacts
org-capture org-agenda network-stream nsm starttls gnus-agent gnus-srvr
gnus-score score-mode nnvirtual gnus-msg gnus-art mm-uu mml2015 mm-view
mml-smime smime dig nntp gnus-cache gnus-sum gnus-group gnus-undo
my-gnus-init.el offlineimap gnus-start gnus-cloud nnimap nnmail
mail-source tls gnutls utf7 netrc nnoo gnus-spec gnus-int gnus-range
message puny rfc822 mml mml-sec epa derived epg mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader gnus-win
gnus nnheader gnus-util rmail rmail-loaddefs rfc2047 rfc2045 ietf-drums
mail-utils winner helm-command helm-elisp helm-eval edebug server
my-init.el my-whitespace whitespace my-vc my-uniquify my-tramp
my-tool-bar my-tex my-tex-site my-tex-buf my-simple my-sh-script
my-sendmail my-reftex my-proof-useropts my-plain-tex my-pg-custom
my-pdf-view my-pdf-tools pdf-occur ibuf-ext ibuffer ibuffer-loaddefs
tablist tablist-filter semantic/wisent/comp semantic/wisent
semantic/wisent/wisent semantic/util-modes semantic/util semantic
semantic/tag semantic/lex semantic/fw mode-local cedet pdf-isearch
let-alist pdf-misc imenu pdf-tools pdf-view jka-compr pdf-cache pdf-info
pdf-util my-ox ox-odt rng-loc rng-uri rng-parse rng-match rng-dt
rng-util rng-pttrn nxml-parse nxml-ns nxml-enc xmltok nxml-util ox-latex
ox-icalendar ox-html table ox-ascii ox-publish ox org-element avl-tree
org org-macro org-footnote org-pcomplete org-list org-faces org-entities
noutline outline org-version ob-emacs-lisp ob ob-tangle org-src ob-ref
ob-lob ob-table ob-keys ob-comint find-func cal-menu calendar
cal-loaddefs ob-exp ob-core org-compat ob-eval org-macs my-ox-publish
my-time my-ox-html my-org my-org-contacts my-org-capture my-org-agenda
my-dired-some-files my-offlineimap my-nnml my-nnmail my-nnir my-nnfolder
mm-util mail-prsvr my-base-feature my-nadvice my-my-ypldap-org-contacts
my-my-time my-my-el-get-port my-el-get-port my-my-bibtex-file-field
my-my-bibtex-clean agda-input quail my-my-base-feature my-mouse
my-mm-decode my-message my-menu-bar my-mailcap my-macrostep my-latex
my-ispell my-info my-helm my-helm-mode my-helm-lib my-helm-files
my-helm-dabbrev my-helm-config my-helm-command my-helm-buffers my-gnutls
my-gnus my-gnus-topic my-gnus-sum my-gnus-start my-gnus-msg
my-gnus-group my-gnus-dired my-gnus-demon my-gnus-async my-gnus-art
my-frame my-font-lock my-font-core my-flyspell my-files my-faces
my-emms-source-file my-emms-setup emms-librefm-stream
emms-librefm-scrobbler emms-playlist-limit emms-volume
emms-volume-amixer emms-i18n emms-history emms-score emms-stream-info
emms-metaplaylist-mode emms-bookmarks emms-cue emms-mode-line-icon
emms-browser sort emms-playlist-sort emms-last-played emms-player-xine
emms-player-mpd tq emms-playing-time emms-lyrics emms-url time-date
emms-streams emms-show-all emms-tag-editor emms-mark emms-mode-line
emms-cache emms-info-ogginfo emms-info-mp3info emms-info later-do
emms-playlist-mode emms-player-vlc emms-player-mplayer
emms-player-simple emms-source-playlist emms-source-file locate
my-elisp-mode my-diminish my-delsel delsel my-cus-edit cus-edit
cus-start cus-load wid-edit my-coq my-coq-system my-compile
my-company-coq my-bibtex my-agda-input my-use-package use-package
bind-key my-el-get org-loaddefs helm-mode helm-files rx image-dired
image-mode tramp tramp-compat tramp-loaddefs trampver ucs-normalize
shell pcomplete parse-time format-spec dired-x dired-aux ffap thingatpt
helm-buffers helm-elscreen helm-tags helm-bookmark helm-adaptive
helm-info info bookmark helm-locate helm-grep helm-regexp helm-external
helm-net browse-url xml helm-utils compile comint ansi-color ring
helm-help helm-types helm easy-mmode helm-source eieio-compat
helm-multi-match helm-lib advice helm-config helm-easymenu edmacro
kmacro helm-autoloads emms-setup emms emms-compat diminish proof-site
proof-autoloads pg-vars preview-latex tex-site auto-loads .loaddefs
el-get-bundle el-get el-get-autoloading el-get-list-packages
el-get-dependencies el-get-build el-get-status pp el-get-methods
el-get-fossil el-get-svn el-get-pacman el-get-github-zip
el-get-github-tar el-get-http-zip el-get-http-tar el-get-hg el-get-go
el-get-git-svn el-get-fink el-get-emacswiki el-get-http el-get-notify
el-get-emacsmirror el-get-github el-get-git el-get-elpa el-get-darcs
el-get-cvs el-get-bzr el-get-brew el-get-builtin el-get-apt-get
el-get-recipes el-get-byte-compile subr-x el-get-custom el-get-core
autoload radix-tree lisp-mnt cl dired dired-loaddefs my-system url
url-proxy url-privacy url-expand url-methods url-history url-cookie
url-domsuf url-util mailcap finder-inf package epg-config url-handlers
url-parse auth-source cl-seq eieio eieio-core cl-macs eieio-loaddefs
password-cache url-vars seq byte-opt gv bytecomp byte-compile cl-extra
help-mode easymenu cconv cl-loaddefs pcase cl-lib disp-table mule-util
tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type
mwheel term/x-win x-win term/common-win x-dnd tool-bar dnd fontset image
regexp-opt fringe tabulated-list replace newcomment text-mode elisp-mode
lisp-mode prog-mode register page menu-bar rfn-eshadow isearch timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame cl-generic cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms cp51932
hebrew greek romanian slovak czech european ethiopic indian cyrillic
chinese composite charscript case-table epa-hook jka-cmpr-hook help
simple abbrev obarray minibuffer cl-preloaded nadvice loaddefs button
faces cus-face macroexp files text-properties overlay sha1 md5 base64
format env code-pages mule custom widget hashtable-print-readable
backquote dbusbind inotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty
make-network-process emacs)

Memory information:
((conses 16 567283 26624)
 (symbols 48 51192 2)
 (miscs 40 131 303)
 (strings 32 133090 16113)
 (string-bytes 1 4369195)
 (vectors 16 76644)
 (vector-slots 8 1110642 10975)
 (floats 8 728 400)
 (intervals 56 923 8)
 (buffers 976 25)
 (heap 1024 71343 2610))

-- 
N. Raghavendra <raghu@HIDDEN>, http://www.retrotexts.net/
Harish-Chandra Research Institute, http://www.hri.res.in/




Acknowledgement sent to "N. Raghavendra" <raghu@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#26910; Package emacs. Full text available.
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Last modified: Mon, 25 Nov 2019 12:00:02 UTC

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Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.