From: Katsumi Yamaoka <yamaoka@jpl.org>
Subject: Re: how to turn this Gnus function into a macro?
Date: Thu, 08 Jan 2004 11:13:52 +0900 [thread overview]
Message-ID: <b9yvfnn2nmn.fsf@jpl.org> (raw)
In-Reply-To: <4noetfo10c.fsf@collins.bwh.harvard.edu>
>>>>> In <4noetfo10c.fsf@collins.bwh.harvard.edu>
>>>>> Ted Zlatanov <tzz@lifelogs.com> wrote:
> I tried to make this function into a macro but failed.
How about it?
(defmacro spam-fetch-field-fast (article field)
"Fetch a field quickly, using the internal gnus-data-list function"
(let ((macro (cond ((eq field 'from) 'mail-header-from)
((eq field 'message-id) 'mail-header-message-id)
((eq field 'subject) 'mail-header-subject)
((eq field 'references) 'mail-header-references)
((eq field 'date) 'mail-header-date)
((eq field 'xref) 'mail-header-xref)
((eq field 'extra) 'mail-header-extra))))
(if macro
`(let ((article ,article))
(if (numberp article)
(let* ((header (assoc article (gnus-data-list nil)))
(data-header (if header (gnus-data-header header))))
(,macro data-header)))))))
(macroexpand '(spam-fetch-field-fast ART from))
=> (let ((article ART))
(if (numberp article)
(let* ((header (assoc article (gnus-data-list nil)))
(data-header (if header (gnus-data-header header))))
(mail-header-from data-header))))
If the arg `article' is always not a cons form (i.e., a number
or a symbol), it can be simplified as follows:
(defmacro spam-fetch-field-fast (article field)
"Fetch a field quickly, using the internal gnus-data-list function"
(let ((macro (cond ((eq field 'from) 'mail-header-from)
((eq field 'message-id) 'mail-header-message-id)
((eq field 'subject) 'mail-header-subject)
((eq field 'references) 'mail-header-references)
((eq field 'date) 'mail-header-date)
((eq field 'xref) 'mail-header-xref)
((eq field 'extra) 'mail-header-extra))))
(if macro
`(if (numberp ,article)
(let* ((header (assoc ,article (gnus-data-list nil)))
(data-header (if header (gnus-data-header header))))
(,macro data-header))))))
(macroexpand '(spam-fetch-field-fast ART from))
=> (if (numberp ART)
(let* ((header (assoc ART (gnus-data-list nil)))
(data-header (if header (gnus-data-header header))))
(mail-header-from data-header)))
--
Katsumi Yamaoka <yamaoka@jpl.org>
next prev parent reply other threads:[~2004-01-08 2:13 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-07 22:19 Ted Zlatanov
2004-01-07 22:55 ` Jesper Harder
2004-01-08 0:09 ` Ted Zlatanov
2004-01-08 4:13 ` Jesper Harder
2004-01-08 2:13 ` Katsumi Yamaoka [this message]
2004-01-08 3:28 ` Ted Zlatanov
2004-01-08 3:33 ` Katsumi Yamaoka
2004-01-08 3:42 ` Jeremy Maitin-Shepard
2004-01-08 3:47 ` Katsumi Yamaoka
2004-01-08 4:06 ` Jeremy Maitin-Shepard
2004-01-08 6:06 ` Katsumi Yamaoka
2004-01-08 20:30 ` Ted Zlatanov
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