🚀 go-pugleaf

A while back, I got this off the net.  It worked great until
I tried printing a calendar for a leap year.  Well, here's the
same program with the leap year bug fixed.  Enjoy.


%!
% PostScript program to draw calendar
% Copyright (C) 1987 by Pipeline Associates, Inc.
% Permission is granted to modify and distribute this free of charge.
% Leap year bug fixed 1/19/88: Alex Pang, UCLA

% The number after /month should be set to a number from 1 to 12.
% The number after /year should be set to the year you want.
% You can change the title and date fonts, if you want.
% We figure out the rest.
% This program won't produce valid calendars before 1800 (weird stuff
% happened in September of 1752)

% To get the calendar out, save this file in a file called "foo",
% and say "lpr foo", voila!

/month 3 def
/year 1988 def
/titlefont /Times-Bold def
/dayfont /Helvetica-Bold def

/month_names [ (January) (February) (March) (April) (May) (June) (July)
		(August) (September) (October) (November) (December) ] def
/month_name month_names month 1 sub get def

/prtnum { 3 string cvs show} def

/drawgrid {		% draw calendar boxes
	dayfont findfont 10 scalefont setfont
	0 1 6 {
		dup dup 100 mul 40 moveto
		[ (Sunday) (Monday) (Tuesday) (Wednesday) (Thursday) (Friday) (Saturday) ] exch get
		90 center
		100 mul 38 moveto
		.5 setlinewidth
		60 {
			gsave
			90 0 rlineto stroke
			grestore
			0 -10 rmoveto
		} repeat
	} for

} def

/drawnums {		% place day numbers on calendar
	dayfont findfont 40 scalefont setfont
	/start startday def
	/days ndays def
	start 100 mul 0 rmoveto
	1 1 days {
		/day exch def
		gsave
		  isdouble
		  {
			day prtdouble
		  }
		  {
			day prtnum
		  } ifelse
		grestore
		day start add 7 mod 0 eq
		{
			currentpoint exch pop 100 sub 0 exch moveto
		}
		{
			100 0 rmoveto
		} ifelse
	} for
} def

/isdouble {		% is today going to be overlaid on next week's?
	days start add 35 gt
	{
		day start add 35 gt
		{
			true true
		}
		{
			day start add 28 gt
			day 7 add days le and
			{
				false true
			}
			{
				false
			} ifelse
		} ifelse
	}
	{
		false
	} ifelse
} def

/prtdouble {
	gsave
	  dayfont findfont 20 scalefont setfont
	  exch
	  {
		30 100 rmoveto
		prtnum
	  }
	  {
		0 12 rmoveto
		prtnum
		0 -12 rmoveto
		gsave
		  dayfont findfont 40 scalefont setfont
		  (/) show
		grestore
	  } ifelse
	grestore
} def

/isleap {		% is this a leap year?
	year 4 mod 0 eq		% multiple of 4
	year 100 mod 0 ne 	% not century
	year 1000 mod 0 eq or and	% unless it's a millenia
} def

/days_month [ 31 28 31 30 31 30 31 31 30 31 30 31 ] def

/ndays {		% number of days in this month
	days_month month 1 sub get
	month 2 eq	% Feb
	isleap and
	{
		1 add
	} if
} def

/firsttime 1 1 eq def	% firsttime = true

/startday {		% starting day-of-week for this month
	/off year 2000 sub def	% offset from start of "epoch"
	off
	off    4 idiv add	% number of leap years
	off  100 idiv sub	% number of centuries
	off 1000 idiv add	% number of millenia
	6 add 7 mod 7 add 	% offset from Jan 1 2000
	/off exch def
	1 1 month 1 sub {
		days_month exch 1 sub get
		month 3 eq
		isleap and
		firsttime and
		{
			1 add
			/firsttime 1 0 eq def	% firsttime = false
		} if
		/off exch off add def
	} for
	off 7 mod		% 0--Sunday, 1--monday, etc.
} def

/center {		% center string in given width
	/width exch def
	/str exch def width str 
	stringwidth pop sub 2 div 0 rmoveto str show
} def

90 rotate
50 -120 translate

titlefont findfont 48 scalefont setfont
0 60 moveto
month_name show
/yearstring year 10 string cvs def
700 yearstring stringwidth pop sub 60 moveto
yearstring show

0 0 moveto
drawnums

0 0 moveto
drawgrid

showpage