From: Frozenlock <frozenlock@gmail.com>
To: emacs-devel@gnu.org
Subject: New minor mode toggling in V24
Date: Thu, 19 Jan 2012 19:49:53 -0500 [thread overview]
Message-ID: <CACjB3duCXf9Ykr59igbnNKD9aY3Mc2bELnU6XEF886RCe8-ixQ@mail.gmail.com> (raw)
Dear GNU Emacs developers,
I've noticed that I can no longer use the form (some-minor-mode) to
toggle a minor mode on and off in a function. The function's
documentation now says "If called from Lisp, enable the mode if ARG is
omitted or nil."
My understanding of Lisp would have led me into thinking that a mode
is on when true and off when nil. Of course, I'm sure there's a good
reason for this, such as the "toggling" behavior.
However, that a function could behave differently when called
interactively violates the principle of least astonishment.
_Especially_ for functions used as often as modes.
If only it was that...
Now to toggle a mode inside a function, I do something like this:
(some-minor-mode (when some-minor-mode-variable) -1)
Yet, some modes do not name the some-minor-mode-variable the same as
the mode itself, making the action of toggling a mode a one of a kind,
built only for this mode.
Could minor-modes function behave the same when called by a function
as they would if called interactively? I believe The toggling would be
easier to understand for everyone (at least for myself).
ARG nil --> toggle
ARG 1 --> on
ARG -1 --> off
Thank you for your time,
Christian Fortin
next reply other threads:[~2012-01-20 0:49 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-20 0:49 Frozenlock [this message]
2012-01-20 13:55 ` New minor mode toggling in V24 Stefan Monnier
2012-01-20 18:01 ` Frozenlock
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