add ical support'

Gemfile

@@ -13,6 +13,9 @@ gem 'builder'
 # Checks
 gem 'w3c_validators'
 
+# ical files
+gem 'icalendar'
+
 group :development do
   gem 'adsf'
   gem 'guard-nanoc'

Gemfile.lock

@@ -32,6 +32,7 @@ GEM
       nanoc (~> 4.0)
     hamster (3.0.0)
       concurrent-ruby (~> 1.0)
+    icalendar (2.4.0)
     json (2.0.1)
     kramdown (1.11.1)
     listen (3.1.5)
@@ -79,6 +80,7 @@ DEPENDENCIES
   builder
   coffee-script
   guard-nanoc
+  icalendar
   kramdown
   nanoc (= 4.2.4)
   nokogiri

Rules

@@ -2,6 +2,7 @@
 # frozen_string_literal: true
 
 require 'json'
+require 'icalendar'
 
 #
 #
@@ -83,6 +84,10 @@ compile '/posts/**/*', rep: :text do
   filter :strip_html
 end
 
+compile '/posts/**/*', rep: :ical do
+  filter :ical
+end
+
 #
 # GENERIC ERB PAGES
 #
@@ -90,6 +95,10 @@ compile '/tipuesearch_content.js.erb' do
   filter :erb
 end
 
+compile '/**/*.ics.erb' do
+  filter :erb
+end
+
 compile '/*.erb' do
   layout '/generic.*'
   layout '/default.*'
@@ -142,6 +151,15 @@ route '/assets/scripts/**/*' do
 end
 
 # TEXT
+route '/*.ics.erb' do
+  item.identifier.without_ext
+end
+
+# POSTS
+route '/posts/**/*', rep: :ical do
+  "#{item.identifier.without_ext}.ics"
+end
+
 route '/**/*.{erb,html,md}' do
   "#{item.identifier.without_ext}/index.html"
 end

content/ical.ics.erb

@@ -0,0 +1 @@
+<%= event_calendar %>

lib/filters/ical_filter.rb

@@ -0,0 +1,9 @@
+class IcalFilter < Nanoc::Filter
+  identifier :ical
+
+  def run(_content, _params = {})
+    cal = Icalendar::Calendar.new
+    cal.add_event(event_for(item))
+    cal.to_ical
+  end
+end

lib/helpers/ical.rb

@@ -0,0 +1,18 @@
+module IcalHelper
+  def event_calendar
+    cal = Icalendar::Calendar.new
+
+    events = items.find_all('/posts/**/*').map { |i| event_for(i) }
+    events.each { |e| cal.add_event(e) }
+
+    cal.to_ical
+  end
+
+  def event_for(i)
+    event = Icalendar::Event.new
+    event.dtstart = Date.parse(i[:time])
+    event.summary = 'A great event!'
+
+    event
+  end
+end

lib/helpers_.rb

@@ -5,3 +5,4 @@ include Nanoc::Helpers::Rendering
 include Nanoc::Helpers::Text
 
 include ArchiveHelper
+include IcalHelper