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########################################################################
##
## Copyright (C) 2004-2024 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this
## distribution or <https://octave.org/copyright/>.
##
## This file is part of Octave.
##
## Octave is free software: you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## Octave is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING. If not, see
## <https://www.gnu.org/licenses/>.
##
########################################################################
## -*- texinfo -*-
## @deftypefn {} {@var{c} =} calendar ()
## @deftypefnx {} {@var{c} =} calendar (@var{d})
## @deftypefnx {} {@var{c} =} calendar (@var{y}, @var{m})
## @deftypefnx {} {} calendar (@dots{})
## Return the current monthly calendar in a 6x7 matrix.
##
## If @var{d} is specified, return the calendar for the month containing the
## date @var{d}, which must be a serial date number or a date string.
##
## If @var{y} and @var{m} are specified, return the calendar for year @var{y}
## and month @var{m}.
##
## If no output arguments are specified, print the calendar on the screen
## instead of returning a matrix.
## @seealso{datenum, datestr}
## @end deftypefn
function c = calendar (y, m)
switch (nargin)
case 0
v = clock ();
y = v(1);
m = v(2);
d = v(3);
case 1
v = datevec (y);
y = v(1);
m = v(2);
d = v(3);
case 2
d = [];
endswitch
cal = zeros (7, 6);
dayone = datenum (y, m, 1);
ndays = eomday (y, m);
cal(weekday (dayone) - 1 + [1:ndays]) = 1:ndays;
if (nargout > 0)
c = cal';
else
## Layout the calendar days, 6 columns per day, 7 days per row.
str = sprintf (" %2d %2d %2d %2d %2d %2d %2d\n", cal);
## Print an asterisk before the specified date.
if (! isempty (d))
pos = weekday (dayone) + d - 1;
idx = 6*pos + fix (pos / 7.1) - ifelse (d < 10, 1, 2);
str(idx) = "*";
endif
## Display the calendar.
s.year = y - 1900;
s.mon = m - 1;
puts (strftime (" %b %Y\n", s));
puts (" S M Tu W Th F S\n");
puts (str);
endif
endfunction
%!demo
%! ## Calendar for current month
%! calendar ()
%!demo
%! ## Calendar for October, 1957
%! calendar (1957, 10)
%!assert ((calendar(2000,2))'(2:31), [0:29])
%!assert ((calendar(1957,10))'(2:33), [0:31])
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