http://github.com/icalendar/icalendar
iCalendar is a Ruby library for dealing with iCalendar files in the iCalendar format defined by RFC-2445:
The use of calendaring and scheduling has grown considerably in the last decade. Enterprise and inter-enterprise business has become dependent on rapid scheduling of events and actions using this information technology. However, the longer term growth of calendaring and scheduling, is currently limited by the lack of Internet standards for the message content types that are central to these knowledgeware applications. This memo is intended to progress the level of interoperability possible between dissimilar calendaring and scheduling applications. This memo defines a MIME content type for exchanging electronic calendaring and scheduling information. The Internet Calendaring and Scheduling Core Object Specification, or iCalendar, allows for the capture and exchange of information normally stored within a calendaring and scheduling application; such as a Personal Information Manager (PIM) or a Group Scheduling product.
The iCalendar format is suitable as an exchange format between applications or systems. The format is defined in terms of a MIME content type. This will enable the object to be exchanged using several transports, including but not limited to SMTP, HTTP, a file system, desktop interactive protocols such as the use of a memory- based clipboard or drag/drop interactions, point-to-point asynchronous communication, wired-network transport, or some form of unwired transport such as infrared might also be used.
require 'icalendar'
require 'date'
include Icalendar # You should do this in your class to limit namespace overlap
# Create a calendar with an event (standard method)
cal = Calendar.new
cal.event do
dtstart Date.new(2005, 04, 29)
dtend Date.new(2005, 04, 28)
summary "Meeting with the man."
description "Have a long lunch meeting and decide nothing..."
klass "PRIVATE"
end
cal.publish
event = Event.new
event.start = DateTime.civil(2006, 6, 23, 8, 30)
event.summary = "A great event!"
cal.add_event(event)
event2 = cal.event # This automatically adds the event to the calendar
event2.start = DateTime.civil(2006, 6, 24, 8, 30)
event2.summary = "Another great event!"
params = {"ALTREP" =>['"http://my.language.net"'], "LANGUAGE" => ["SPANISH"]}
cal.event do
dtstart Date.new(2005, 04, 29)
dtend Date.new(2005, 04, 28)
summary "This is a summary with params.", params
end
cal_string = cal.to_ical
puts cal_string
cal.event.do
# ...other event properties
alarm do
action "EMAIL"
description "This is an event reminder" # email body (required)
summary "Alarm notification" # email subject (required)
attendees %w(mailto:[email protected] mailto:[email protected]) # one or more email recipients (required)
add_attendee "mailto:[email protected]"
remove_attendee "mailto:[email protected]"
trigger "-PT15M" # 15 minutes before
add_attach "ftp://host.com/novo-procs/felizano.exe", {"FMTTYPE" => "application/binary"} # email attachments (optional)
end
alarm do
action "DISPLAY" # This line isn't necessary, it's the default
summary "Alarm notification"
trigger "-P1DT0H0M0S" # 1 day before
end
alarm do
action "AUDIO"
trigger "-PT15M"
add_attach "Basso", {"VALUE" => ["URI"]} # only one attach allowed (optional)
end
end
# BEGIN:VALARM
# ACTION:EMAIL
# ATTACH;FMTTYPE=application/binary:ftp://host.com/novo-procs/felizano.exe
# TRIGGER:-PT15M
# SUMMARY:Alarm notification
# DESCRIPTION:This is an event reminder
# ATTENDEE:mailto:[email protected]
# ATTENDEE:mailto:[email protected]
# END:VALARM
#
# BEGIN:VALARM
# ACTION:DISPLAY
# TRIGGER:-P1DT0H0M0S
# SUMMARY:Alarm notification
# END:VALARM
#
# BEGIN:VALARM
# ACTION:AUDIO
# ATTACH;VALUE=URI:Basso
# TRIGGER:-PT15M
# END:VALARM
cal = Calendar.new
cal.timezone do
timezone_id "America/Chicago"
daylight do
timezone_offset_from "-0600"
timezone_offset_to "-0500"
timezone_name "CDT"
dtstart "19700308TO20000"
add_recurrence_rule "FREQ=YEARLY;BYMONTH=3;BYDAY=2SU"
end
standard do
timezone_offset_from "-0500"
timezone_offset_to "-0600"
timezone_name "CST"
dtstart "19701101T020000"
add_recurrence_rule "YEARLY;BYMONTH=11;BYDAY=1SU"
end
end
# BEGIN:VTIMEZONE
# TZID:America/Chicago
# BEGIN:DAYLIGHT
# TZOFFSETFROM:-0600
# TZOFFSETTO:-0500
# TZNAME:CDT
# DTSTART:19700308T020000
# RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU
# END:DAYLIGHT
# BEGIN:STANDARD
# TZOFFSETFROM:-0500
# TZOFFSETTO:-0600
# TZNAME:CST
# DTSTART:19701101T020000
# RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU
# END:STANDARD
# END:VTIMEZONE
Add $KCODE = 'u' to make icalender work correctly with Utf8 texts
# Open a file or pass a string to the parser
cal_file = File.open("single_event.ics")
# Parser returns an array of calendars because a single file
# can have multiple calendars.
cals = Icalendar.parse(cal_file)
cal = cals.first
# Now you can access the cal object in just the same way I created it
event = cal.events.first
puts "start date-time: #{event.dtstart}"
puts "start date-time timezone: #{event.dtstart.icalendar_tzid}" if event.dtstart.is_a?(DateTime)
puts "summary: #{event.summary}"
# Some calendars contain non-standard parameters (e.g. Apple iCloud
# calendars). You can pass in a `strict` value when creating a new parser.
unstrict_parser = Icalendar::Parser.new(cal_file, false)
cal = unstrict_parser.parse()
Often times in web apps and other interactive applications you'll need to lookup items in a calendar to make changes or get details. Now you can find everything by the unique id automatically associated with all components.
cal = Calendar.new
10.times { cal.event } # Create 10 events with only default data.
some_event = cal.events[5] # Grab it from the array of events
# Use the uid as the key in your app
key = some_event.uid
# so later you can find it.
same_event = cal.find_event(key)
Check the unit tests for examples of most things you'll want to do, but please send me example code or let me know what's missing.
The latest release version of this library can be found at
It's all about rubygems:
$ gem install icalendar
To run the tests:
$ bundle install
$ rake test
This library is released under the same license as Ruby itself.
Please submit pull requests from a rebased topic branch and include tests for all bugs and features.