CalBot schedule your book reading for the year. Produces an iCal file for importing into your reading calendar.

calbot.rb

#!/usr/bin/env ruby
require 'date'
require 'securerandom'
require 'optparse'

def header()
  <<~EOS
BEGIN:VCALENDAR
CALSCALE:GREGORIAN
PRODID:-//SENCJW Heavy Industries, Ltd.//CalBot//EN
VERSION:2.0
EOS
end

def event(d, name)
  now = Time.now.utc.strftime("%Y%m%dT%H%M%SZ")
  uuid = SecureRandom.uuid.upcase
  dtstart="#{d.year}#{'%02d' % d.month}#{'%02d' % d.day}"
  <<~EOS
BEGIN:VEVENT
CREATED:#{now}
DTSTAMP:#{now}
DTSTART;VALUE=DATE:#{dtstart}
SUMMARY:#{name}
TRANSP:TRANSPARENT
UID:#{uuid}
END:VEVENT
EOS
end

options = {}
optp = OptionParser.new do |opts|
  opts.banner = "Usage: calbot.rb [options]"

  opts.on("-h", "--help", "Show help") do
    puts opts
    exit 0
  end

  opts.on("-oFILE", "--output=FILE", "Specify output calendar file (.ics format)") do |f|
    options[:filename] = f
  end

  opts.on("-nNUM", "--num=NUM", "Set number of books to read (default 52)") do |n|
    options[:num_books] = n.to_i
  end

  opts.on("-yYEAR", "--year=YEAR", "Set the reading year (default this year)") do |y|
    options[:year] = y.to_i
  end

end
optp.parse!

unless options[:filename] 
  puts "Output filename argument is required (-o)"
  puts optp
  exit 1
end

if options[:num_books]
  days_per_book = 365 / options[:num_books]
else
  options[:num_books] = 52
  days_per_book = 7
end

unless options[:year]
  options[:year] = Time.now.year
end

File.open(options[:filename], 'w') do |f|
  f.write(header())
  start_date = Date.new(options[:year], 1, 1)
  (0...options[:num_books]).each do |n|
    date = start_date + n * days_per_book
    f.write(event(date, "Book #{n+1}"))
  end
end