require 'date'
if ARGV.empty?
print "calendar / usage: [month] [year]\n"
exit 1
end
month = ARGV.shift.to_i
year = ARGV.shift.to_i
day = 1
wday = 0
print "Sun\tMon\tTue\tWed\tThu\tFri\tSat\n"
while true
if(Date.valid_date?(year,month,day))
target_day = Date.new(year,month,day)
end
if day > 1 && Date.valid_date?(year,month,day) || (day == 1 && target_day.wday == wday)
print "#{day}\t"
day += 1
else
print "\t"
end
wday = (wday + 1) % 7
if wday == 0
print "\n";
if !Date.valid_date?(year,month,day) && wday == 0
break
end
end
end