Creates iCalendar (ical) format output containing commits from a Git repo.

gitcal

#!/usr/bin/env ruby

# Creates iCalendar (ical) format output containing commits from a Git repo.
# Save as a file and import into Google Calendar or iCal on Mac.
# Publish on a webserver and link to Google Calendar directly.

# Install & Use:
# gem install grit icalendar
# chmod +x gitcal
# ./gitcal /path/to/repo > commits.ical

require 'rubygems'
require 'grit'
require 'icalendar'
require 'date'
require 'optparse'

include Grit
include Icalendar

options = {
  :branch => 'master',
  :count  => 1000
}

opt_parser = OptionParser.new do |opts|
  opts.banner = "Usage: gitcal [options] [repo path]\n" +
                "       gitcal [options] [repo path] > calendar.ical"
  opts.separator ''
  opts.on('-b', '--branch BRANCH', 'Specify repo branch (default "master")') do |b|
    options[:branch] = b
  end
  opts.on('-c', '--count COUNT', 'Specify how many commits to include (default 1000)') do |c|
    options[:count] = c
  end
  opts.on('-h', '--help', 'Show this help message.') do |h|
    options[:show_help] = h
  end
end
opt_parser.parse!

if options[:show_help]
  puts opt_parser.help
  puts
  exit
end

cal = Calendar.new

repo = Repo.new(ARGV.first || '.')
repo.commits(options[:branch], options[:count]).each do |commit|
  cal.event do
    dtstart commit.authored_date.utc.strftime('%Y%m%dT%H%M%S')
    dtend   commit.authored_date.utc.strftime('%Y%m%dT%H%M%S')
    summary commit.message
  end
end

cal.publish
puts cal.to_ical