mail2ics.rb

#!/usr/bin/env ruby
require 'rubygems'
require 'logger'

require 'chronic'
require 'ri_cal'
require 'action_mailer'
require 'mail'

# Use this gem for getting mail: https://github.com/mikel/mail
#   - I will convert sending mail to that shortly

$username = 'followuptest1@gmail.com'
$password = ARGV[0]

ActionMailer::Base.smtp_settings = {
  :address        => 'smtp.redhat.com',
  :port           => '587', 
}

class Notifier < ActionMailer::Base
  default :from => $username

  def reminder(hash,event)
    attachments['reminder.ics'] = {
      :mime_type => 'text/calendar',
      :content => event.export
    }

    mail(:to => hash[:from], :subject => "Reminder: #{hash[:subject]}") do |format|
      format.text{ render :text => ''}
      format.html{ render :text => ''}
    end
  end
end

def parsetime(offset, time = Time.now)
  puts "Original offset: #{offset}"
  # Parse any starting numbers like '1day'
  if m = offset.match(/^(\d+)(.*)/)
    offset = m.captures.join(' ')
    puts "Offset: #{offset}"
    puts "after num split"
  end

  # Make sure 'from' isnt already specified
  unless m = offset.match(/from/)
    offset << ' from now'
    puts "after fro now"
    puts "Offset: #{offset}"
  end

  offset.gsub!('_',' ')
  puts "After gsub"
  puts "Offset: #{offset}"

  # Parse time
  Chronic.parse("#{offset}", :now => time)
end

# This hash should have the following information from the email
#  - To:      Where we get the offset from
#  - Date:    When the mail was sent
#  - Subject: The subject of the reminder
#  - Body:    The description of the reminder
def create_reminder(hash)
  if m = hash[:to].match(/.*\+(.*?)@/)
    offset = m.captures.first
    if reminder_time = parsetime(offset,hash[:date])

      event = RiCal.Calendar do |cal|
        cal.event do |e|
          e.summary = hash[:subject]
          e.dtstart = reminder_time.getutc
          e.dtend = reminder_time.getutc
          e.description = hash[:body]
        end
      end
      return event
    end
  end
end

Mail.defaults do
  retriever_method :pop3, :address => 'pop.gmail.com',
    :port => 995,
    :user_name => $username,
    :password => $password,
    :enable_ssl => true
end

log = Logger.new(STDOUT)

Mail.all.each do |m|
  hash = {
    :to => m.to.first,
    :from => m.from.first,
    :date => Time.parse(m.date.to_s),
    :subject => m.subject,
    :body => m.body.decoded
  }

  status = "No event specified"
  if event = create_reminder(hash)
    Notifier.reminder(hash,event).deliver
    status = "Event delivered"
  end
  log.debug "#{Time.now},#{hash[:to]},#{hash[:from]},#{status}"
end