* bug#2470: 23.0.90; auto-fill-mode, :minor-mode-function @ 2009-02-25 17:59 ` Drew Adams 2009-02-25 19:56 ` Stefan Monnier 2011-07-09 22:16 ` Juanma Barranquero 0 siblings, 2 replies; 8+ messages in thread From: Drew Adams @ 2009-02-25 17:59 UTC (permalink / raw To: emacs-pretest-bug 1. Someone on EmacsWiki asked how to tell if a given minor mode is on. I said to check the mode variable. The reply was that auto-fill-mode has no mode variable. The code shows this: (put 'auto-fill-function :minor-mode-function 'auto-fill-mode) ;; FIXME: turn into a proper minor mode. ;; Add a global minor mode version of it. (defun auto-fill-mode (&optional arg) ... So it seems to be in need of a fix, but I see no bug filed against it. 2. What is :minor-mode-function? It is used in a couple of places in the Emacs Lisp sources, with no comment or other explanation. It is not in the Elisp manual. It seems to be a way to associate a different function with a minor mode - a function with a different name from the mode itself. For example, `auto-fill-function' is the :minor-mode-function for `auto-fill-mode'. Is this mechanism still needed if `define-minor-mode' is used? Is it just for compatibility with XEmacs code and legacy code? How about documenting it - at least with a comment in the code somewhere: what is for, how and when to use it. In GNU Emacs 23.0.90.1 (i386-mingw-nt5.1.2600) of 2009-02-01 on SOFT-MJASON Windowing system distributor `Microsoft Corp.', version 5.1.2600 configured using `configure --with-gcc (3.4)' ^ permalink raw reply [flat|nested] 8+ messages in thread
* bug#2470: 23.0.90; auto-fill-mode, :minor-mode-function 2009-02-25 17:59 ` bug#2470: 23.0.90; auto-fill-mode, :minor-mode-function Drew Adams @ 2009-02-25 19:56 ` Stefan Monnier 2009-02-25 20:02 ` Drew Adams 2011-07-09 22:16 ` Juanma Barranquero 1 sibling, 1 reply; 8+ messages in thread From: Stefan Monnier @ 2009-02-25 19:56 UTC (permalink / raw To: Drew Adams; +Cc: emacs-pretest-bug, 2470 > So it seems to be in need of a fix, but I see no bug filed against it. Then file one. > 2. What is :minor-mode-function? It is used in a couple of places in > the Emacs Lisp sources, with no comment or other explanation. It is > not in the Elisp manual. It seems to be a way to associate a > different function with a minor mode - a function with a different > name from the mode itself. For example, `auto-fill-function' is the > :minor-mode-function for `auto-fill-mode'. > Is this mechanism still needed if `define-minor-mode' is used? Is it > just for compatibility with XEmacs code and legacy code? It's got nothing to do with XEmacs, AFAIK, but it does have with legacy code such as auto-fill-function. > How about documenting it - at least with a comment in the code > somewhere: what is for, how and when to use it. When to use it, is easy: never in new code. Stefan ^ permalink raw reply [flat|nested] 8+ messages in thread
* bug#2470: 23.0.90; auto-fill-mode, :minor-mode-function 2009-02-25 19:56 ` Stefan Monnier @ 2009-02-25 20:02 ` Drew Adams 0 siblings, 0 replies; 8+ messages in thread From: Drew Adams @ 2009-02-25 20:02 UTC (permalink / raw To: 'Stefan Monnier'; +Cc: emacs-pretest-bug, 2470 > From: Stefan Monnier Sent: Wednesday, February 25, 2009 11:57 AM > > So it seems to be in need of a fix, but I see no bug filed > > against it. > > Then file one. Is it a joke? That's what this bug report is. ^ permalink raw reply [flat|nested] 8+ messages in thread
* bug#2470: 23.0.90; auto-fill-mode, :minor-mode-function 2009-02-25 17:59 ` bug#2470: 23.0.90; auto-fill-mode, :minor-mode-function Drew Adams 2009-02-25 19:56 ` Stefan Monnier @ 2011-07-09 22:16 ` Juanma Barranquero 2011-07-09 23:10 ` Drew Adams 1 sibling, 1 reply; 8+ messages in thread From: Juanma Barranquero @ 2011-07-09 22:16 UTC (permalink / raw To: Drew Adams; +Cc: 2470 On Wed, Feb 25, 2009 at 18:59, Drew Adams <drew.adams@oracle.com> wrote: > I said to check the mode variable. The reply was that > auto-fill-mode has no mode variable. As you point out below, the "mode variable" for auto-fill-mode is auto-fill-function. Is what gets set in minor-mode-alist, and its a reliable way to know whether the mode is active or not. > ;; FIXME: turn into a proper minor mode. > ;; Add a global minor mode version of it. > (defun auto-fill-mode (&optional arg) > ... > > So it seems to be in need of a fix, but I see no bug filed against it. It now says: ;; FIXME: turn into a proper minor mode. ;; Add a global minor mode version of it. (define-minor-mode auto-fill-mode The comment (from 2002) is still there, but the mode was converted to define-minor-mode in 2010. > Is this mechanism still needed if `define-minor-mode' is used? Is it > just for compatibility with XEmacs code and legacy code? define-minor-mode has an equivalent :variable keyword, used, as in this case, when it is preferable to get/set the mode variable differently, or use another variable. It is not, AFAIK, because of XEmacs compatibility, but cases where the variable is not just a toggle; for example, overwrite-mode uses it too, and also the new emacs-lock-mode that I committed a few days ago. > How about documenting it - at least with a comment in the code > somewhere: what is for, how and when to use it. About :minor-mode-function, Stefan already answered you that should not be used in new code, so nothing to document. Is anything more to be done about this bug? Juanma ^ permalink raw reply [flat|nested] 8+ messages in thread
* bug#2470: 23.0.90; auto-fill-mode, :minor-mode-function 2011-07-09 22:16 ` Juanma Barranquero @ 2011-07-09 23:10 ` Drew Adams 2011-07-09 23:18 ` Juanma Barranquero 0 siblings, 1 reply; 8+ messages in thread From: Drew Adams @ 2011-07-09 23:10 UTC (permalink / raw To: 'Juanma Barranquero'; +Cc: 2470 > Is anything more to be done about this bug? I guess not, if people have taken a look at it and done whatever they think needed doing (if anything). Would someone such as the person who posed the original question about how to tell if this minor mode is on know now how to do that for `auto-fill-mode'? That's really the question, I think. Are things sufficiently clear (e.g. from the doc) that a user would now know how to tell this? I'll let you decide. I don't know what, if anything, has changed since the bug report was filed. ^ permalink raw reply [flat|nested] 8+ messages in thread
* bug#2470: 23.0.90; auto-fill-mode, :minor-mode-function 2011-07-09 23:10 ` Drew Adams @ 2011-07-09 23:18 ` Juanma Barranquero 2011-07-10 9:54 ` Drew Adams 0 siblings, 1 reply; 8+ messages in thread From: Juanma Barranquero @ 2011-07-09 23:18 UTC (permalink / raw To: Drew Adams; +Cc: 2470 On Sun, Jul 10, 2011 at 01:10, Drew Adams <drew.adams@oracle.com> wrote: > I guess not, if people have taken a look at it and done whatever they think > needed doing (if anything). Codewise, I don't think there's anything to be done. > Would someone such as the person who posed the original question about how to > tell if this minor mode is on know now how to do that for `auto-fill-mode'? > > That's really the question, I think. Are things sufficiently clear (e.g. from > the doc) that a user would now know how to tell this? Likely not, though strictly speaking, a user that needs to know the variable name will usually be able to take a look at minor-mode-alist and deduce it by himself. In any case, could you please suggest a suitable change for the docstring of auto-fill-mode? Juanma ^ permalink raw reply [flat|nested] 8+ messages in thread
* bug#2470: 23.0.90; auto-fill-mode, :minor-mode-function 2011-07-09 23:18 ` Juanma Barranquero @ 2011-07-10 9:54 ` Drew Adams 2011-07-16 18:43 ` Lars Magne Ingebrigtsen 0 siblings, 1 reply; 8+ messages in thread From: Drew Adams @ 2011-07-10 9:54 UTC (permalink / raw To: 'Juanma Barranquero'; +Cc: 2470 > > That's really the question, I think. Are things > > sufficiently clear (e.g. from > > the doc) that a user would now know how to tell this? > > Likely not, though strictly speaking, a user that needs to know the > variable name will usually be able to take a look at minor-mode-alist > and deduce it by himself. > > In any case, could you please suggest a suitable change for the > docstring of auto-fill-mode? I don't see a problem with that doc string in particular. What did you have in mind? This part is a little unclear: "The value of `normal-auto-fill-function' specifies the function to use for `auto-fill-function' when turning Auto Fill mode on." One wonders why it speaks of `auto-fill-function', as if it is something understood (begs the question of its relation to `auto-fill-mode'). If you then click the `auto-fill-function' link you get doc on that function, but it's not clear at all what it has to do with `auto-fill-mode'. It does say also this: "auto-fill-function is also a variable." But the name is neither quoted (`...') nor a link to help on that var. And there is nothing saying anything about what you said: that the variable tells you whether `auto-fill-mode' is on (which was the OP question). Perhaps we should at least add something like this to the `auto-fill-mode' doc: "When `auto-fill-mode' is on, variable `auto-fill-function' is non-`nil'." ^ permalink raw reply [flat|nested] 8+ messages in thread
* bug#2470: 23.0.90; auto-fill-mode, :minor-mode-function 2011-07-10 9:54 ` Drew Adams @ 2011-07-16 18:43 ` Lars Magne Ingebrigtsen 0 siblings, 0 replies; 8+ messages in thread From: Lars Magne Ingebrigtsen @ 2011-07-16 18:43 UTC (permalink / raw To: Drew Adams; +Cc: 'Juanma Barranquero', 2470 "Drew Adams" <drew.adams@oracle.com> writes: > Perhaps we should at least add something like this to the `auto-fill-mode' doc: > > "When `auto-fill-mode' is on, variable `auto-fill-function' is non-`nil'." I've now added this. -- (domestic pets only, the antidote for overdose, milk.) bloggy blog http://lars.ingebrigtsen.no/ ^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2011-07-16 18:43 UTC | newest] Thread overview: 8+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- [not found] <AcmXctCJzHsFMr8USuWNNuSa9WxT6w==> 2009-02-25 17:59 ` bug#2470: 23.0.90; auto-fill-mode, :minor-mode-function Drew Adams 2009-02-25 19:56 ` Stefan Monnier 2009-02-25 20:02 ` Drew Adams 2011-07-09 22:16 ` Juanma Barranquero 2011-07-09 23:10 ` Drew Adams 2011-07-09 23:18 ` Juanma Barranquero 2011-07-10 9:54 ` Drew Adams 2011-07-16 18:43 ` Lars Magne Ingebrigtsen
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