From: Benjamin Slade <slade@jnanam.net>
To: emacs-devel@gnu.org
Subject: new calendrical calculations - elisp - common lisp
Date: Mon, 13 Jun 2011 11:40:06 -0500 [thread overview]
Message-ID: <BANLkTi=_Vm9RDDxkuN_u9ChXmhR1gO_PrA@mail.gmail.com> (raw)
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I would like to add a "module" to Emacs for converting from Gregorian dates
into traditional Indian/Hindu dates (Bikrama Samvat), and, perhaps more
importantly, for calculating Hindu holidays.
I found a very nice set of functions for doing so implemented in Common Lisp
in *Deshow, Nachum and Reingold, Edward M. 2008. _Calendrical Calculations_.
New York: Cambridge University Press, 3rd edn*. I was wondering if this
perhaps has already been implemented (given that Reingold developed the
original calendar calculations for Emacs).
If not: What is the best way of using this code in Emacs? I know that Emacs
Lisp is different from Common Lisp - and I also know that there is/are
package(s?) for using Common Lisp within Emacs.
What I don't know is:
(1) Can this code just be converted into Emacs Lisp? Or are there bits of it
which would require Common Lisp?
[Right now it doesn't work - I know that Emacs Lisp requires "defconst"
rather than "defconstant", but even changing that, I get a "condition-case:
Symbol's value as variable is void: 279457/1080000" error for:
(defconst hindu-sidereal-year
;; TYPE rational
;; Mean length of Hindu sidereal year.
(+ 365 279457/1080000))
And changing the definition to (+ 365 (/ 1080000 279457)) it seems just to
round.]
(2) Or else, if it is necessary, how to use Common Lisp packages in Emacs.
I have transcribed the code here:
http://www.jnanam.net/emacs/hindu-calendar.el [there are probably typos in
it yet].
I'm, obviously, not really a Lisp coder, but I am looking for some pointers
for how to get this code working within Emacs.
thanks,
--Ben
-----------------------------------------------------------------------------------------------------
Benjamin Slade
Dept. of Linguistics
University of Illinois at Urbana-Champaign
[ http://www.jnanam.net/slade/ ]
Stæfcræft & Vyākaraṇa (lingblog) - http://staefcraeft.blogspot.com
The Babbage Files (techblog) - http://babbagefiles.blogspot.com
-----------------------------------------------------------------------------------------------------
*प*रो ऽक्ष॑का*मा* हि *दे*वाः
'The gods love the obscure.' (Śatapathabrāmaṇa 6.1.1.2)
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next reply other threads:[~2011-06-13 16:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-13 16:40 Benjamin Slade [this message]
[not found] ` <4DF64086.20802@cs.ucla.edu>
2011-06-13 17:00 ` new calendrical calculations - elisp - common lisp Benjamin Slade
2011-06-13 19:28 ` Paul Eggert
2011-06-13 17:06 ` Edward Reingold
2011-06-13 19:59 ` Richard Stallman
2011-06-17 20:34 ` Chong Yidong
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