Weekling

• Documentation
• Project

Weekling is a Ruby library which provides class representations to make date calculations using years, weeks and week-days much easier. Years, weeks and week-days are interpreted as in ISO 8601.

This project tries to conform to:

• Semantic Versioning (2.0.0-rc.1)
• Ruby Packaging Standard (0.5-draft)
• Ruby Style Guide
• Gem Packaging: Best Practices

Additional facts:

• Written purely in Ruby.
• Documented with YARD.
• Intended to be used with Ruby 1.9.2 or compatible.
• Extends core classes. This can be disabled through bare mode.
• Cryptographically signed gem and git tags.

This documentation defines the public interface of the software. Don't rely on elements marked as private. Those should be hidden in the documentation by default.

In most cases you want to load the library by the following command:

require 'weekling'

In a bundler Gemfile you should use the following:

gem 'weekling'

By default, Weekling extends the Integer, Date, DateTime and Time classes to allow their objects to be castable to Year, Week and WeekDay. Additionally the Aef namespace is included into Object, so that you don't have to type the fully-qualified names of the classes. Should you really don't want this, use the following:

require 'weekling/bare'

Or for bundler Gemfiles:

gem 'weekling', require: 'weekling/bare'

The following examples are written for those who use the normal mode. If you use the bare mode, you need to add Aef::Weekling in front of every class name.

A Year object is constructed either by a date-like or and integer-like object:

year = Year.new(Time.new(2014, 3, 12))
# => #<Aef::Weekling::Year: 2014>

year = Year.new(2014)
# => #<Aef::Weekling::Year: 2014>

To get an Integer or String representation simply use the following:

year.to_i
# => 2014

year.to_s
# => "2014"

The next or previous years can be accessed by the respective methods:

year.next
# => #<Aef::Weekling::Year: 2015>

year.previous
# => #<Aef::Weekling::Year: 2013>

You can also add or subtract amounts of years to get another year object:

year + 5
# => #<Aef::Weekling::Year: 2019>

year - 7
# => #<Aef::Weekling::Year: 2007>

The year is also able to tell you if it is even or odd:

year.even?
# => true

year.odd?
# => false

The year also knows how many weeks it has:

year.week_count
# => 52

Or if it is a leap year:

year.leap?
# => false

You can either get an enumerable list of weeks from an existing year:

year.weeks
# => #<Aef::Weekling::Week: 2014-W01>..#<Aef::Weekling::Week: 2014-W52>

Or request individual weeks from a year object:

year.week(30)
# => #<Aef::Weekling::Week: 2014-W30>

Or you can construct a week by year and index (week number):

week = Week.new(2012, 37)
# => #<Aef::Weekling::Week: 2012-W37>

To regain the year or index you can simply access the attributes:

week.year
# => #<Aef::Weekling::Year: 2012>

week.index
# => 37

The next or previous weeks can be accessed by the respective methods:

week.next
# => #<Aef::Weekling::Week: 2012-W38>

week.previous
# => #<Aef::Weekling::Week: 2012-W36>

You can also add or subtract amounts of weeks to get another week object:

week + 5
# => #<Aef::Weekling::Week: 2012-W42>

week - 7
# => #<Aef::Weekling::Week: 2012-W30>

The week is also able to tell you if it is even or odd:

week.even?
# => false

week.odd?
# => true

You can also construct a range of weeks starting with the current, which can be iterated through or which can be easily converted to an Array. The range will run until given index in the future is reached. Notice that this means, if the given index is lower or equal to the current, the end of the range will be in the following year:

week.until_index(45)
# => #<Aef::Weekling::Week: 2012-W37>..#<Aef::Weekling::Week: 2012-W45>

week.until_index(11)
# => #<Aef::Weekling::Week: 2012-W37>..#<Aef::Weekling::Week: 2013-W11>

You can either get an enumerable list of week-days from an existing week:

week.days
# => #<Aef::Weekling::WeekDay: 2012-W37-1>..#<Aef::Weekling::WeekDay: 2012-W37-7>

week.weekend
# => [#<Aef::Weekling::WeekDay: 2012-W37-6>, #<Aef::Weekling::WeekDay: 2012-W37-7>]

Or request individual week-days from a week object:

week.day(3)
# => #<Aef::Weekling::WeekDay: 2012-W37-3>

week.day(:friday)
# => #<Aef::Weekling::WeekDay: 2012-W37-5>

week.monday
# => #<Aef::Weekling::WeekDay: 2012-W37-1>

Or you can create a week-day by year, week and day. The day can be an index between 1 and 7 (monday to sunday), or the lower-case english name of the day as symbol. Example below:

week_day = WeekDay.new(2012, 37, 4)
# => #<Aef::Weekling::WeekDay: 2012-W37-4>

week_day = WeekDay.new(2012, 37, :thursday)
# => #<Aef::Weekling::WeekDay: 2012-W37-4>

To regain the week and the index you can access the attributes:

week_day.week
# => #<Aef::Weekling::Week: 2012-W37>

week_day.index
# => 4

If you want the symbolized name instead, use the following:

week_day.to_sym
# => :thursday

As in weeks you can get the next and previous day the following way:

week_day.next
# => #<Aef::Weekling::WeekDay: 2012-W37-5>

week_day.previous
# => #<Aef::Weekling::WeekDay: 2012-W37-3>

You can also add or subtract amounts of week-days to get another week-day object:

week_day + 5
# => #<Aef::Weekling::WeekDay: 2012-W38-2>

week_day - 7
# => #<Aef::Weekling::WeekDay: 2012-W36-4>

Each week-day can be converted to a regular date easily:

week_day.to_date
# => #<Date: 2012-09-13 (…)>

You can ask a week-day if it is a specific day in week:

week_day.tuesday?
# => false

week_day.thursday?
# => true

• Ruby 1.9.2 or compatible

On *nix systems you may need to prefix the command with sudo to get root privileges.

There is a high security installation option available through rubygems. It is highly recommended over the normal installation, although it may be a bit less comfortable. To use the installation method, you will need my gem signing public key, which I use for cryptographic signatures on all my gems.

Add the key to your rubygems' trusted certificates by the following command:

gem cert --add aef-gem.pem

Now you can install the gem while automatically verifying it's signature by the following command:

gem install weekling -P HighSecurity

Please notice that you may need other keys for dependent libraries, so you may have to install dependencies manually.

gem install weekling

Go into the root directory of the installed gem and run the following command to fetch all development dependencies:

bundle

Afterwards start the test runner:

rake spec

If something goes wrong you should be noticed through failing examples.

Please use the issue tracker on github.com to let me know about errors or ideas for improvement of this software.

This software is developed in the source code management system Git. There are several synchronized mirror repositories available:

• GitHub

  URL: https://github.com/aef/weekling.git

• Gitorious

  URL: https://git.gitorious.org/weekling/weekling.git

• BitBucket

  URL: https://bitbucket.org/alefi/weekling.git

You can get the latest source code with the following command, while exchanging the placeholder for one of the mirror URLs:

git clone MIRROR_URL

The final commit before each released gem version will be marked by a tag named like the version with a prefixed lower-case "v", as required by Semantic Versioning. Every tag will be signed by my OpenPGP public key which enables you to verify your copy of the code cryptographically.

Add the key to your GnuPG keyring by the following command:

gpg --import aef-openpgp.asc

This command will tell you if your code is of integrity and authentic:

git tag -v [TAG NAME]

Help on making this software better is always very appreciated. If you want your changes to be included in the official release, please clone my project on github.com, create a named branch to commit and push your changes into and send me a pull request afterwards.

Please make sure to write tests for your changes so that I won't break them when changing other things on the library. Also notice that I can't promise to include your changes before reviewing them.

Copyright Alexander E. Fischer aef@raxys.net, 2012

This file is part of Weekling.

Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.