The Kai Way

一段日历生成的代码

    def month_day(month, year=Date.today.year)
    mdays = [nil, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
    mdays[2] = 29 if Date.leap?(year)
    mdays[month]
    end

    def calendar(month, year)
    days = month_day(month, year)
    t = Time.mktime(year, month, 1)
    first = t.wday
    list = *1..days
    weeks = [[]]
    week1 = 7 - first
    week1.times { weeks[0] << list.shift }
    nweeks = list.size/7 + 1
    nweeks.times do |i|
    weeks[i+1] ||= []
    7.times do
    break if list.empty?
    weeks[i+1] << list.shift
    end
    end
    pad_first = 7 - weeks[0].size
    pad_first.times { weeks[0].unshift(nil) }
    pad_last = 7 - weeks[0].size
    pad_last.times { weeks[-1].unshift(nil) }
    weeks
    end

    def calendar_table(month, year)
    today = Time.now.day
    table_body = ""
    calendar(month, year).each do |week|
    table_body += "<tr>"
    week.each do |day|
    if day.nil?
    table_body += "<td></td>"
    else
    table_body += (day == today) ? "<td class='today'>" : "<td>"
    table_body += "#{day}</td>"
    end
    end
    table_body += "</tr>"
    end
    table_body
    end

calendar(month, year)方法其实是《The Ruby Way》里面的。