From 8448436a46b10ba54a2ce27c8eadfe03b0bd62a6 Mon Sep 17 00:00:00 2001
From: Lorin Werthen <werthenlorin@gmail.com>
Date: Wed, 27 Jul 2016 00:13:36 +0200
Subject: [PATCH] add ical support'

---
 Gemfile                                 |  3 +++
 Gemfile.lock                            |  2 ++
 Rules                                   | 18 ++++++++++++++++++
 content/{feed.erb => feed.xml.erb}      |  0
 content/ical.ics.erb                    |  1 +
 lib/filters/ical_filter.rb              |  9 +++++++++
 lib/helpers/ical.rb                     | 18 ++++++++++++++++++
 lib/{helpers/helpers.rb => helpers_.rb} |  1 +
 8 files changed, 52 insertions(+)
 rename content/{feed.erb => feed.xml.erb} (100%)
 create mode 100644 content/ical.ics.erb
 create mode 100644 lib/filters/ical_filter.rb
 create mode 100644 lib/helpers/ical.rb
 rename lib/{helpers/helpers.rb => helpers_.rb} (90%)

diff --git a/Gemfile b/Gemfile
index af0876d..0a3fe3d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -13,6 +13,9 @@ gem 'builder'
 # Checks
 gem 'w3c_validators'
 
+# ical files
+gem 'icalendar'
+
 group :development do
   gem 'adsf'
   gem 'guard-nanoc'
diff --git a/Gemfile.lock b/Gemfile.lock
index 6c70245..e780af9 100644
--- a/Gemfile.lock
+++ b/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
diff --git a/Rules b/Rules
index ba42946..111b328 100644
--- a/Rules
+++ b/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
diff --git a/content/feed.erb b/content/feed.xml.erb
similarity index 100%
rename from content/feed.erb
rename to content/feed.xml.erb
diff --git a/content/ical.ics.erb b/content/ical.ics.erb
new file mode 100644
index 0000000..2b4d96e
--- /dev/null
+++ b/content/ical.ics.erb
@@ -0,0 +1 @@
+<%= event_calendar %>
diff --git a/lib/filters/ical_filter.rb b/lib/filters/ical_filter.rb
new file mode 100644
index 0000000..a5c8acc
--- /dev/null
+++ b/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
diff --git a/lib/helpers/ical.rb b/lib/helpers/ical.rb
new file mode 100644
index 0000000..22a3b55
--- /dev/null
+++ b/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
diff --git a/lib/helpers/helpers.rb b/lib/helpers_.rb
similarity index 90%
rename from lib/helpers/helpers.rb
rename to lib/helpers_.rb
index be8a7a4..86f3a76 100644
--- a/lib/helpers/helpers.rb
+++ b/lib/helpers_.rb
@@ -5,3 +5,4 @@ include Nanoc::Helpers::Rendering
 include Nanoc::Helpers::Text
 
 include ArchiveHelper
+include IcalHelper