Merge pull request #348 from lrug/calendar

Generate ics file for recent events

Gemfile

@@ -7,3 +7,4 @@ gem 'builder'
 gem 'git'
 gem 'nokogiri'
 gem 'pry'
+gem 'icalendar'

Gemfile.lock

@@ -35,6 +35,9 @@ GEM
     hashie (3.6.0)
     i18n (1.6.0)
       concurrent-ruby (~> 1.0)
+    icalendar (2.10.2)
+      ice_cube (~> 0.16)
+    ice_cube (0.17.0)
     kramdown (2.4.0)
       rexml
     listen (3.0.8)
@@ -119,6 +122,7 @@ PLATFORMS
 DEPENDENCIES
   builder
   git
+  icalendar
   middleman
   nokogiri
   pry

config.rb

@@ -50,6 +50,7 @@
 
 page '/.htaccess', layout: false
 page '/version.json', layout: false
+page '/meetings.ics', layout: false
 
 ready do
   sitemap.resources.

data/redirects.json

@@ -19,7 +19,7 @@
   },
   {
     "from":"meeting-calendar",
-    "to":"https://www.google.com/calendar/ical/[email protected]/public/basic.ics"
+    "to":"/meetings.ics"
   },
   {
     "from":"speaking",

lib/lrug_helpers.rb

@@ -189,7 +189,7 @@ def render_markdown(md)
   end
 
   def meeting_calendar_link
-    %{<span class="calendar-link"><a href="/meeting-calendar"><img src="https://assets.lrug.org/images/calendar_down.gif" alt="Calendar subscription" loading="lazy"> Meeting Calendar</a></span>}
+    %{<span class="calendar-link"><a href="/meetings.ics"><img src="https://assets.lrug.org/images/calendar_down.gif" alt="Calendar subscription" loading="lazy"> Meeting Calendar</a></span>}
   end
 
   def indent_xml(indent, xml_string)
@@ -215,6 +215,46 @@ def has_host?(page)
     content_part_exists?('hosted_by', page) || page.data.has_key?('hosted_by')
   end
 
+  def events_calendar(site_url:)
+    calendar = Icalendar::Calendar.new
+    calendar.timezone do |timezone|
+      timezone.tzid = 'Europe/London'
+    end
+    zone = ActiveSupport::TimeZone['Europe/London']
+
+    all_meetings = meeting_pages
+
+    upcoming = all_meetings.take_while {|page| page.metadata[:page][:meeting_date] >= Date.today}
+    next_12 = all_meetings.drop(upcoming.length).take(12)
+
+    (upcoming + next_12).each do |page|
+      url = URI.join(site_url, page.url)
+      date = page.metadata[:page][:meeting_date]
+      title = page.metadata[:page][:title]
+      hosts  = page.metadata[:page][:hosted_by]
+
+      calendar.event do |event|
+        event.uid = "lrug-monthly-#{date.strftime('%Y-%m')}"
+        event.dtstart = date.in_time_zone(zone).change(hour:18)
+        event.dtend   = date.in_time_zone(zone).change(hour:20)
+        event.summary   = "London Ruby User Group - #{title}"
+        event.url         = URI.join(site_url, page.url)
+
+        if hosts.present?
+          hosted_by = "Hosted by: #{hosts.map {|h| h[:name]}.join(', ')}"
+        end
+
+        event.description = <<~DESC
+        London Ruby User Group - #{title}
+
+        #{hosted_by}
+        DESC
+      end
+    end
+
+    calendar
+  end
+
   private
   def inline_content_render(content, fake_pathname, locals: {})
     # create a middleman filerenderer to do the work, the extension in

source/meetings.ics.erb

@@ -0,0 +1 @@
+<%= events_calendar(site_url: "https://lrug.org/").to_ical %>