events a bit more

Gemfile

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 source 'https://rubygems.org'
 
-gem 'nanoc', '~>4.2'
+gem 'nanoc', '~>4.3.1'
 gem 'kramdown'
 gem 'coffee-script'
 # Needed for relativize_urls

Gemfile.lock

@@ -3,7 +3,7 @@ GEM
   specs:
     adsf (1.2.1)
       rack (>= 1.0.0)
-    autoprefixer-rails (6.4.0.2)
+    autoprefixer-rails (6.4.0.3)
       execjs
     builder (3.2.2)
     coderay (1.1.1)
@@ -45,7 +45,7 @@ GEM
     lumberjack (1.0.10)
     method_source (0.8.2)
     mini_portile2 (2.1.0)
-    nanoc (4.3.0)
+    nanoc (4.3.2)
       cri (~> 2.3)
       hamster (~> 3.0)
       ref (~> 2.0)
@@ -87,7 +87,7 @@ DEPENDENCIES
   highline
   icalendar
   kramdown
-  nanoc (~> 4.2)
+  nanoc (~> 4.3.1)
   nokogiri
   sass
   w3c_validators

content/events.erb

@@ -0,0 +1,25 @@
+---
+navigable: true
+title: Events
+---
+
+<div>
+  <div class="content">
+    <h1>Upcoming events</h1>
+  </div>
+
+  <% all_events.each do |event| %>
+  <div class="box">
+    <a href="<%= relative_path_to(event) %>">
+      <%= event[:title] %>
+    </a>
+    <% sub_events(event).each do |sub_event| %>
+    [
+    <a href="<%= relative_path_to(sub_event) %>">
+      <%= sub_event[:title] %>
+    </a>
+    ]
+    <% end %>
+  </div>
+  <% end %>
+</div>

lib/filters/ical_filter.rb

@@ -1,11 +1,5 @@
-# This doesn't use the new define syntax yet because item
-# is not available there
-class IcalFilter < Nanoc::Filter
-  identifier :ical
-
-  def run(_content, _params = {})
+Nanoc::Filter.define(:ical) do |_content, _params|
   cal = Icalendar::Calendar.new
   cal.add_event(event_for(item))
   cal.to_ical
-  end
 end

lib/helpers/events.rb

@@ -0,0 +1,20 @@
+module EventsHelper
+  def all_events
+    @items.find_all('/events/*/*') + grouped_events
+  end
+
+  def grouped_events
+    @items.find_all('/events/*/*/main.md')
+  end
+
+  def sub_events(grouped_event)
+    if grouped_event.identifier =~ /main.md/
+      query = grouped_event.identifier.to_s.split('/')[0..-2].join('/') + '/*'
+      @items.find_all(query).reject do |i|
+        i.identifier =~ /main.md/
+      end
+    else
+      []
+    end
+  end
+end

lib/helpers_.rb

@@ -6,6 +6,7 @@ include Nanoc::Helpers::Text
 
 include ArchiveHelper
 include AssetHelper
+include EventsHelper
 include IcalHelper
 include NavigationHelper
 include DataHelper