* holidays.el
@ 2004-07-19 15:59 ` Håkon Malmedal
2004-07-19 17:35 ` holidays.el Ed Reingold
2004-09-22 23:27 ` holidays.el Glenn Morris
0 siblings, 2 replies; 8+ messages in thread
From: Håkon Malmedal @ 2004-07-19 15:59 UTC (permalink / raw)
I was thinking that if the function holiday-easter-etc looked
something like this:
(defun holiday-easter-etc (n string)
"Holiday on Nth day after Easter called STRING."
(let* ((century (1+ (/ displayed-year 100)))
(shifted-epact ;; Age of moon for April 5...
(% (+ 14 (* 11 (% displayed-year 19));; ...by Nicaean rule
(- ;; ...corrected for the Gregorian century rule
(/ (* 3 century) 4))
(/ ;; ...corrected for Metonic cycle inaccuracy.
(+ 5 (* 8 century)) 25)
(* 30 century));; Keeps value positive.
30))
(adjusted-epact ;; Adjust for 29.5 day month.
(if (or (= shifted-epact 0)
(and (= shifted-epact 1) (< 10 (% displayed-year 19))))
(1+ shifted-epact)
shifted-epact))
(paschal-moon ;; Day after the full moon on or after March 21.
(- (calendar-absolute-from-gregorian (list 4 19 displayed-year))
adjusted-epact))
(abs-easter (calendar-dayname-on-or-before 0 (+ paschal-moon 7)))
(mandatory
(list
(list (calendar-gregorian-from-absolute (+ abs-easter n))
string)))
(output-list
(filter-visible-calendar-holidays mandatory)))
output-list))
and the function holiday-advent looked something like this:
(defun holiday-advent (n string)
"Holiday on Nth day after Advent called STRING."
(let ((year displayed-year)
(month displayed-month))
(increment-calendar-month month year -1)
(let ((advent (calendar-gregorian-from-absolute
(+ n
(calendar-dayname-on-or-before 0
(calendar-absolute-from-gregorian
(list 12 3 year)))))))
(if (calendar-date-is-visible-p advent)
(list (list advent string))))))
then the variable christian-holidays (in calendar.el) could look like
this:
;;;###autoload
(put 'christian-holidays 'risky-local-variable t)
;;;###autoload
(defcustom christian-holidays
'((if all-christian-calendar-holidays
(holiday-fixed 1 6 "Epiphany"))
(holiday-easter-etc 0 "Easter Sunday")
(holiday-easter-etc -2 "Good Friday")
(holiday-easter-etc -46 "Ash Wednesday")
(if all-christian-calendar-holidays
(holiday-easter-etc -63 "Septuagesima Sunday"))
(if all-christian-calendar-holidays
(holiday-easter-etc -56 "Sexagesima Sunday"))
(if all-christian-calendar-holidays
(holiday-easter-etc -49 "Shrove Sunday"))
(if all-christian-calendar-holidays
(holiday-easter-etc -48 "Shrove Monday"))
(if all-christian-calendar-holidays
(holiday-easter-etc -47 "Shrove Tuesday"))
(if all-christian-calendar-holidays
(holiday-easter-etc -14 "Passion Sunday"))
(if all-christian-calendar-holidays
(holiday-easter-etc -7 "Palm Sunday"))
(if all-christian-calendar-holidays
(holiday-easter-etc -3 "Maundy Thursday"))
(if all-christian-calendar-holidays
(holiday-easter-etc 35 "Rogation Sunday"))
(if all-christian-calendar-holidays
(holiday-easter-etc 39 "Ascension Day"))
(if all-christian-calendar-holidays
(holiday-easter-etc 49 "Pentecost (Whitsunday)"))
(if all-christian-calendar-holidays
(holiday-easter-etc 50 "Whitmonday"))
(if all-christian-calendar-holidays
(holiday-easter-etc 56 "Trinity Sunday"))
(if all-christian-calendar-holidays
(holiday-easter-etc 60 "Corpus Christi"))
(if all-christian-calendar-holidays
(holiday-greek-orthodox-easter))
(if all-christian-calendar-holidays
(holiday-fixed 8 15 "Assumption"))
(if all-christian-calendar-holidays
(holiday-advent 0 "Advent"))
(holiday-fixed 12 25 "Christmas")
(if all-christian-calendar-holidays
(holiday-julian 12 25 "Eastern Orthodox Christmas")))
"*Christian holidays.
See the documentation for `calendar-holidays' for details."
:type 'sexp
:group 'holidays)
and be much easier to customize. Is this a good/bad idea?
^ permalink raw reply [flat|nested] 8+ messages in thread* Re: holidays.el
2004-07-19 15:59 ` holidays.el Håkon Malmedal
@ 2004-07-19 17:35 ` Ed Reingold
2004-09-22 23:27 ` holidays.el Glenn Morris
1 sibling, 0 replies; 8+ messages in thread
From: Ed Reingold @ 2004-07-19 17:35 UTC (permalink / raw)
Cc: emacs-devel
That's a good idea--there are similar things elsewhere that should be changed.
I did not write it that way originally (nearly 20 years ago!) because it would
have been too slow; now hardware is so fast that the difference in time would
be negligible. Feel free to fix this.
> I was thinking that if the function holiday-easter-etc looked
> something like this:
>
> (defun holiday-easter-etc (n string)
> "Holiday on Nth day after Easter called STRING."
> (let* ((century (1+ (/ displayed-year 100)))
> (shifted-epact ;; Age of moon for April 5...
> (% (+ 14 (* 11 (% displayed-year 19));; ...by Nicaean rule
> (- ;; ...corrected for the Gregorian century rule
> (/ (* 3 century) 4))
> (/ ;; ...corrected for Metonic cycle inaccuracy.
> (+ 5 (* 8 century)) 25)
> (* 30 century));; Keeps value positive.
> 30))
> (adjusted-epact ;; Adjust for 29.5 day month.
> (if (or (= shifted-epact 0)
> (and (= shifted-epact 1) (< 10 (% displayed-year 19))))
> (1+ shifted-epact)
> shifted-epact))
> (paschal-moon ;; Day after the full moon on or after March 21.
> (- (calendar-absolute-from-gregorian (list 4 19 displayed-year))
> adjusted-epact))
> (abs-easter (calendar-dayname-on-or-before 0 (+ paschal-moon 7)))
> (mandatory
> (list
> (list (calendar-gregorian-from-absolute (+ abs-easter n))
> string)))
> (output-list
> (filter-visible-calendar-holidays mandatory)))
> output-list))
>
> and the function holiday-advent looked something like this:
>
> (defun holiday-advent (n string)
> "Holiday on Nth day after Advent called STRING."
> (let ((year displayed-year)
> (month displayed-month))
> (increment-calendar-month month year -1)
> (let ((advent (calendar-gregorian-from-absolute
> (+ n
> (calendar-dayname-on-or-before 0
> (calendar-absolute-from-gregorian
> (list 12 3 year)))))))
> (if (calendar-date-is-visible-p advent)
> (list (list advent string))))))
>
> then the variable christian-holidays (in calendar.el) could look like
> this:
>
> ;;;###autoload
> (put 'christian-holidays 'risky-local-variable t)
> ;;;###autoload
> (defcustom christian-holidays
> '((if all-christian-calendar-holidays
> (holiday-fixed 1 6 "Epiphany"))
> (holiday-easter-etc 0 "Easter Sunday")
> (holiday-easter-etc -2 "Good Friday")
> (holiday-easter-etc -46 "Ash Wednesday")
> (if all-christian-calendar-holidays
> (holiday-easter-etc -63 "Septuagesima Sunday"))
> (if all-christian-calendar-holidays
> (holiday-easter-etc -56 "Sexagesima Sunday"))
> (if all-christian-calendar-holidays
> (holiday-easter-etc -49 "Shrove Sunday"))
> (if all-christian-calendar-holidays
> (holiday-easter-etc -48 "Shrove Monday"))
> (if all-christian-calendar-holidays
> (holiday-easter-etc -47 "Shrove Tuesday"))
> (if all-christian-calendar-holidays
> (holiday-easter-etc -14 "Passion Sunday"))
> (if all-christian-calendar-holidays
> (holiday-easter-etc -7 "Palm Sunday"))
> (if all-christian-calendar-holidays
> (holiday-easter-etc -3 "Maundy Thursday"))
> (if all-christian-calendar-holidays
> (holiday-easter-etc 35 "Rogation Sunday"))
> (if all-christian-calendar-holidays
> (holiday-easter-etc 39 "Ascension Day"))
> (if all-christian-calendar-holidays
> (holiday-easter-etc 49 "Pentecost (Whitsunday)"))
> (if all-christian-calendar-holidays
> (holiday-easter-etc 50 "Whitmonday"))
> (if all-christian-calendar-holidays
> (holiday-easter-etc 56 "Trinity Sunday"))
> (if all-christian-calendar-holidays
> (holiday-easter-etc 60 "Corpus Christi"))
> (if all-christian-calendar-holidays
> (holiday-greek-orthodox-easter))
> (if all-christian-calendar-holidays
> (holiday-fixed 8 15 "Assumption"))
> (if all-christian-calendar-holidays
> (holiday-advent 0 "Advent"))
> (holiday-fixed 12 25 "Christmas")
> (if all-christian-calendar-holidays
> (holiday-julian 12 25 "Eastern Orthodox Christmas")))
> "*Christian holidays.
> See the documentation for `calendar-holidays' for details."
> :type 'sexp
> :group 'holidays)
>
> and be much easier to customize. Is this a good/bad idea?
>
>
>
> _______________________________________________
> Emacs-devel mailing list
> Emacs-devel@gnu.org
> http://lists.gnu.org/mailman/listinfo/emacs-devel
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: holidays.el
2004-07-19 15:59 ` holidays.el Håkon Malmedal
2004-07-19 17:35 ` holidays.el Ed Reingold
@ 2004-09-22 23:27 ` Glenn Morris
2004-09-23 7:26 ` holidays.el Kim F. Storm
1 sibling, 1 reply; 8+ messages in thread
From: Glenn Morris @ 2004-09-22 23:27 UTC (permalink / raw)
Cc: emacs-devel
Håkon Malmedal wrote:
> I was thinking that if the function holiday-easter-etc looked
> something like this:
[...]
>
> and the function holiday-advent looked something like this:
[...]
> then the variable christian-holidays (in calendar.el) could look like
> this:
[...]
> and be much easier to customize. Is this a good/bad idea?
Thank you - I installed your suggestions.
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: holidays.el
2004-09-22 23:27 ` holidays.el Glenn Morris
@ 2004-09-23 7:26 ` Kim F. Storm
2004-09-23 10:05 ` holidays.el Glenn Morris
0 siblings, 1 reply; 8+ messages in thread
From: Kim F. Storm @ 2004-09-23 7:26 UTC (permalink / raw)
Cc: hmalmedal, emacs-devel
Glenn Morris <gmorris+emacs@ast.cam.ac.uk> writes:
> Håkon Malmedal wrote:
>
>> I was thinking that if the function holiday-easter-etc looked
>> something like this:
> [...]
>>
>> and the function holiday-advent looked something like this:
> [...]
>> then the variable christian-holidays (in calendar.el) could look like
>> this:
> [...]
>> and be much easier to customize. Is this a good/bad idea?
>
> Thank you - I installed your suggestions.
These changes are more than a "tiny change", so we need papers from
Håkon to install these changes.
--
Kim F. Storm <storm@cua.dk> http://www.cua.dk
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: holidays.el
2004-09-23 7:26 ` holidays.el Kim F. Storm
@ 2004-09-23 10:05 ` Glenn Morris
2004-09-23 10:28 ` holidays.el Kim F. Storm
0 siblings, 1 reply; 8+ messages in thread
From: Glenn Morris @ 2004-09-23 10:05 UTC (permalink / raw)
Cc: Håkon Malmedal, emacs-devel
Kim F. Storm wrote:
> These changes are more than a "tiny change", so we need papers from
> Håkon to install these changes.
I was unsure about that, so I consulted RMS before installing the
changes. He said the opposite to you, but it's entirely possbile I
didn't explain the changes well, so I'm ready to revert them.
Richard Stallman wrote (on Wed, 22 Sep 2004 at 10:00 -0400):
> I would install this, but I'm unsure as to whether there is a
> copyright issue. The total number of lines changed is > 15, but
> the actual idea behind the changes is simple, and it's really
> just case of moving some code from one place to another in a
> repetitive way. Can you advise please?
>
> A change like that is not significant for copyright purposes.
> You go by the amount of new material that he actually wrote.
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: holidays.el
2004-09-23 10:05 ` holidays.el Glenn Morris
@ 2004-09-23 10:28 ` Kim F. Storm
2004-09-23 16:08 ` holidays.el Glenn Morris
2004-09-23 16:44 ` holidays.el Richard Stallman
0 siblings, 2 replies; 8+ messages in thread
From: Kim F. Storm @ 2004-09-23 10:28 UTC (permalink / raw)
Cc: Håkon Malmedal
Glenn Morris <gmorris+emacs@ast.cam.ac.uk> writes:
> Kim F. Storm wrote:
>
>> These changes are more than a "tiny change", so we need papers from
>> Håkon to install these changes.
>
> I was unsure about that, so I consulted RMS before installing the
> changes. He said the opposite to you, but it's entirely possbile I
> didn't explain the changes well, so I'm ready to revert them.
>
>
> Richard Stallman wrote (on Wed, 22 Sep 2004 at 10:00 -0400):
>
>> I would install this, but I'm unsure as to whether there is a
>> copyright issue. The total number of lines changed is > 15, but
>> the actual idea behind the changes is simple, and it's really
>> just case of moving some code from one place to another in a
>> repetitive way. Can you advise please?
>>
>> A change like that is not significant for copyright purposes.
>> You go by the amount of new material that he actually wrote.
The code "moved" from holidays.el to calender.el is 'similar'
but not identical.
It involves taking 40 lines from a function in holidays.el and change
them into a form suitable for initializing a defcustom in calender.el.
I agree that the 'transformation' is repetitive/mechanical, and the
end-result is functionally equivalent to the original code. Still,
the change involves more than just "moving" code.
--
Kim F. Storm <storm@cua.dk> http://www.cua.dk
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: holidays.el
2004-09-23 10:28 ` holidays.el Kim F. Storm
@ 2004-09-23 16:08 ` Glenn Morris
2004-09-23 16:44 ` holidays.el Richard Stallman
1 sibling, 0 replies; 8+ messages in thread
From: Glenn Morris @ 2004-09-23 16:08 UTC (permalink / raw)
Cc: Håkon Malmedal, emacs-devel
Kim F. Storm wrote:
> It involves taking 40 lines from a function in holidays.el and
> change them into a form suitable for initializing a defcustom in
> calender.el.
>
> I agree that the 'transformation' is repetitive/mechanical, and the
> end-result is functionally equivalent to the original code. Still,
> the change involves more than just "moving" code.
Okay, slightly more than just moving; but most of the 40-odd lines can
be described as "do the same simple transformation 20 or so times". I
thought that 40 -> 2 (effectively) in such cases? Though I can't find
the reference at present for why I though that...
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: holidays.el
2004-09-23 10:28 ` holidays.el Kim F. Storm
2004-09-23 16:08 ` holidays.el Glenn Morris
@ 2004-09-23 16:44 ` Richard Stallman
1 sibling, 0 replies; 8+ messages in thread
From: Richard Stallman @ 2004-09-23 16:44 UTC (permalink / raw)
Cc: hmalmedal, emacs-devel
I looked at the specific change, and it qualifies as tiny.
I agree that the 'transformation' is repetitive/mechanical, and the
end-result is functionally equivalent to the original code. Still,
the change involves more than just "moving" code.
A mechanical change does not count more for copyright purposes when it
is repeated many times.
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2004-09-23 16:44 UTC | newest]
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2004-07-19 15:59 ` holidays.el Håkon Malmedal
2004-07-19 17:35 ` holidays.el Ed Reingold
2004-09-22 23:27 ` holidays.el Glenn Morris
2004-09-23 7:26 ` holidays.el Kim F. Storm
2004-09-23 10:05 ` holidays.el Glenn Morris
2004-09-23 10:28 ` holidays.el Kim F. Storm
2004-09-23 16:08 ` holidays.el Glenn Morris
2004-09-23 16:44 ` holidays.el Richard Stallman
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