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#! /usr/bin/env ruby
# cal.rb: Written by Tadayoshi Funaba 1998-2004,2006,2008
# $Id: cal.rb,v 2.11 2008-01-06 08:42:17+09 tadf Exp $
require 'date'
class Cal
START =
{
'cn' => Date::GREGORIAN, # China
'de' => 2342032, # Germany (protestant states)
'dk' => 2342032, # Denmark
'es' => 2299161, # Spain
'fi' => 2361390, # Finland
'fr' => 2299227, # France
'gb' => 2361222, # United Kingdom
'gr' => 2423868, # Greece
'hu' => 2301004, # Hungary
'it' => 2299161, # Italy
'jp' => Date::GREGORIAN, # Japan
'no' => 2342032, # Norway
'pl' => 2299161, # Poland
'pt' => 2299161, # Portugal
'ru' => 2421639, # Russia
'se' => 2361390, # Sweden
'us' => 2361222, # United States
'os' => Date::JULIAN, # (old style)
'ns' => Date::GREGORIAN # (new style)
}
DEFAULT_START = 'gb'
def initialize
opt_j; opt_m; opt_t; opt_y; opt_c
end
def opt_j(flag=false) @opt_j = flag end
def opt_m(flag=false) @opt_m = flag end
def opt_t(flag=false) @opt_t = flag end
def opt_y(flag=false) @opt_y = flag end
def opt_c(arg=DEFAULT_START) @start = START[arg] end
def set_params
@dw = if @opt_j then 3 else 2 end
@mw = (@dw + 1) * 7 - 1
@mn = if @opt_j then 2 else 3 end
@tw = (@mw + 2) * @mn - 2
@k = if @opt_m then 1 else 0 end
@da = if @opt_j then :yday else :mday end
end
def pict(y, m)
d = (1..31).detect{|x| Date.valid_date?(y, m, x, @start)}
fi = Date.new(y, m, d, @start)
fi -= (fi.jd - @k + 1) % 7
ve = (fi..fi + 6).collect{|cu|
%w(S M Tu W Th F S)[cu.wday]
}
ve += (fi..fi + 41).collect{|cu|
if cu.mon == m then cu.send(@da) end.to_s
}
ve = ve.collect{|e| e.rjust(@dw)}
gr = group(ve, 7)
gr = trans(gr) if @opt_t
ta = gr.collect{|xs| xs.join(' ')}
ca = %w(January February March April May June July
August September October November December)[m - 1]
ca = ca + ' ' + y.to_s if !@opt_y
ca = ca.center(@mw)
ta.unshift(ca)
end
def group(xs, n)
(0..xs.size / n - 1).collect{|i| xs[i * n, n]}
end
def trans(xs)
(0..xs[0].size - 1).collect{|i| xs.collect{|x| x[i]}}
end
def stack(xs)
if xs.empty? then [] else xs[0] + stack(xs[1..-1]) end
end
def block(xs, n)
stack(group(xs, n).collect{|ys| trans(ys).collect{|zs| zs.join(' ')}})
end
def unlines(xs)
xs.collect{|x| x + "\n"}.join
end
def monthly(y, m)
unlines(pict(y, m))
end
def addmon(y, m, n)
y, m = (y * 12 + (m - 1) + n).divmod(12)
return y, m + 1
end
def yearly(y)
y.to_s.center(@tw) + "\n\n" +
unlines(block((0..11).collect{|n| pict(*addmon(y, 1, n))}, @mn)) + "\n"
end
def print(y, m)
set_params
if @opt_y then yearly(y) else monthly(y, m) end
end
end
if __FILE__ == $0
require 'getoptlong'
def usage
warn 'usage: cal [-c iso3166] [-jmty] [[month] year]'
exit 1
end
cal = Cal.new
begin
GetoptLong.new(['-c', GetoptLong::REQUIRED_ARGUMENT],
['-j', GetoptLong::NO_ARGUMENT],
['-m', GetoptLong::NO_ARGUMENT],
['-t', GetoptLong::NO_ARGUMENT],
['-y', GetoptLong::NO_ARGUMENT]).
each do |opt, arg|
case opt
when '-c'; cal.opt_c(arg) || raise
when '-j'; cal.opt_j(true)
when '-m'; cal.opt_m(true)
when '-t'; cal.opt_t(true)
when '-y'; cal.opt_y(true)
end
end
rescue
usage
end
y, m = ARGV.values_at(1, 0).compact.collect{|x| x.to_i}
cal.opt_y(true) if y && !m
to = Date.today
y ||= to.year
m ||= to.mon
usage unless m >= 1 && m <= 12
usage unless y >= -4712
print cal.print(y, m)
end
# See Bird & Wadler's Introduction to functional programming 4.5.
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