From: Karl Chen <quarl@cs.berkeley.edu>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: emacs-devel@gnu.org
Subject: Re: cal-x.el/diary-lib.el diary-mode-hook
Date: Thu, 15 May 2008 12:28:41 -0700 [thread overview]
Message-ID: <quack.20080515T1228.lthfxsjwemu@roar.cs.berkeley.edu> (raw)
In-Reply-To: <jwv4p8zwrpx.fsf-monnier+emacs@gnu.org> (Stefan Monnier's message of "Thu\, 15 May 2008 10\:52\:15 -0400")
>>>>> On 2008-05-15 07:52 PDT, Stefan Monnier writes:
>> I realize the documentation for diary-display-hook says
>> "list of functions", but a couple places in the code
>> let-bind diary-display-hook to non-lists, and the
>> documentation in 22.2 has sample code with non-lists.
Stefan> Hooks accept either a function or a list of functions,
Stefan> where the former is only accepted for historical
Stefan> reasons. So all the code that sets hooks to a single
Stefan> function should be reported as (minor) bugs, and all
Stefan> the documentation that does that should be reported as
Stefan> (non-minor) bugs. A quick grep in the EMACS_22_BASE
Stefan> branch disn't show me the sample code you refer to, so
Stefan> could you please tell us where you found it?
Sure.
Emacs 22.2 (Debian)
sample code in docstring:
calendar.el:769: (setq diary-display-hook 'fancy-diary-display)
Let-binds:
appt.el:346: (let* ((diary-display-hook 'appt-make-list)
diary-lib.el:581: (let* ... (diary-display-hook 'ignore)
diary-lib.el:915: (let ((diary-display-hook 'fancy-diary-display))
Stefan> This said, using `memq' on a hook is indeed an error.
Memq on hook:
cal-x.el:90: (if (not (memq 'fancy-diary-display diary-display-hook))
cal-x.el:148: (if (not (memq 'fancy-diary-display diary-display-hook))
Docstring could be tweaked slightly:
diary-lib.el:670: (defun fancy-diary-display ()
diary-lib.el:671: "Prepare a diary buffer with relevant entries in a fancy, noneditable form.
diary-lib.el:672: This function is provided for optional use as the `diary-display-hook'."
Stefan> PS: You should "never" modify a hook with setq, always
Stefan> use `add-hook'.
I see. I think the whole confusion arises because
diary-display-hook doesn't act like a regular hook, where a bunch
of hooks are typically stacked and called sequentially. The
various functions for diary display are really alternates to each
other, not stackable extras. If diary-display-hook already
contains fancy-diary-display, then when add-hook
fancy-schedule-display-desk-calendar has no effect. An nil value
for diary-display-hook also has different semantics than for
regular hooks. Perhaps it should have been called
"diary-display-function" to begin with, though there was probably
a reason for converting it into a list-of-functions hook other
than just its name.
next prev parent reply other threads:[~2008-05-15 19:28 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-15 9:52 cal-x.el/diary-lib.el diary-mode-hook Karl Chen
2008-05-15 14:52 ` Stefan Monnier
2008-05-15 19:28 ` Karl Chen [this message]
2008-05-17 20:24 ` Glenn Morris
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