elisp - common lisp - new calendrical calculations

elisp - common lisp - new calendrical calculations

[Benjamin Slade]

[-- Attachment #1: Type: text/plain, Size: 2097 bytes --]

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*. 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

-----------------------------------------------------------------------------------------------------
  परो ऽक्ष॑कामा हि देवाः
    'The gods love the obscure.' (Śatapathabrāmaṇa 6.1.1.2)

[-- Attachment #2: Type: text/html, Size: 2531 bytes --]

RE: elisp - common lisp - new calendrical calculations

[Drew Adams]

 
> 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*. 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?

I can't help you directly, but you might want to pose this question to
emacs-devel@gnu.org.

IIRC, Ed Reingold wrote the calendar stuff for Emacs (in Emacs Lisp), so it is
likely that either this has already been done for Emacs (perhaps in a later
version than the one you're using) or it will be done.  In any case, try asking
the Emacs developers about this (emacs-devel@gnu.org).

Re: elisp - common lisp - new calendrical calculations

[Benjamin Slade]

[-- Attachment #1: Type: text/plain, Size: 1942 bytes --]

Thanks, Drew. I'll try emas-devel@gnu.org.

On 13 June 2011 11:19, Drew Adams <drew.adams@oracle.com> wrote:

>
> > 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*. 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?
>
> I can't help you directly, but you might want to pose this question to
> emacs-devel@gnu.org.
>
> IIRC, Ed Reingold wrote the calendar stuff for Emacs (in Emacs Lisp), so it
> is
> likely that either this has already been done for Emacs (perhaps in a later
> version than the one you're using) or it will be done.  In any case, try
> asking
> the Emacs developers about this (emacs-devel@gnu.org).
>
>
>


-- 
-----------------------------------------------------------------------------------------------------
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)

[-- Attachment #2: Type: text/html, Size: 2800 bytes --]