Calorie

A calendar is a calendar is a calendar.

This library abstracts away the fiddly logic for displaying a month-like calendar view. It's a presenter, I guess.

Motivation

The third time I found myself writing complicated view code to display a month-like calendar view I decided to go find a library that would abstract this away... and all the libraries I found contained a bunch of html and css stuff (and also depended on Rails), which was a bit more than I wanted.

So I re-invented another wheel (but made it really, really small).

Requirements

This uses Date from the Ruby Standard Library.

Usage

Create a hash that uses the day of the month as the key. The data can be anything; only your code will be interacting with it.

data = {
  1 => thing,
  2 => different_thing,
  3 => nil,
  4 => medium_sized_thing,
  5 => complicated_thing,
  6 => nil,
  # ... etc
}

Obviously, you don't need to pass in any data -- if it's easy enough to just loop through and check what day it is and do whatever you need to do in your template, that's up to you.

Create a calendar for a month by sending in year, month, and the data:

cal = Calorie.new(2010, 6, data)

In your template, you can style it however you wish.

# previous month, e.g. December 2009
cal.previous

# current month, e.g. January 2010
cal.current

# next month, e.g. February 2010
cal.next

cal.days_of_the_week do |day|
  # day.label
  # day.weekend?
end

cal.weeks.each do |week|
  # week.number
  week.days.each do |day|
    unless day.blank?
      # the day of the month is day.number
      # do stuff with day.data, which is
      # whatever you happened to put into the
      # data hash
      if day.today?
        # omg, it's RIGHT NOW
      end
    end
  end
end

Note: Weeks are numbered per ISO-8601. This gets a bit weird if you've configured your week to start on Sunday, as the ISO-8601 specifies that the week starts on Monday. On the other hand, the definition for week 1 is the week that has the year's first Thursday in it, so that can be defined unambiguously even if you start your week on a Sunday.

If you don't need to lay it out by week, you can also iterate straight through the days (though I'm not sure why you'd use Calorie for this):

cal.days.each do |day|
  # the day of the month is day.number
  # do stuff with day.data
  if day.today?
    # omg, it's RIGHT NOW
  end
end

Configuration

By default the first day of the week is Sunday, however this can be changed to Monday like so:

Calorie.configuration do |config|
  config.week_starts_on :monday
end

You will need to add translations for your locale(s). The translations for the week begin with Sunday, regardless of how you configure your week.

# en.yml
---
calorie:
  days_of_the_week: ["Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"]
  months: ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]



# fr.yml
---
calorie:
  days_of_the_week: ["di", "lu", "ma", "me", "je", "ve", "sa"]
  months: ["janv.", "fevr.", "mars", "avr.", "mai", "juin", "juil.", "aout", "sept.", "oct.", "nov.", "dec."]