Merge OSEM updates

app/controllers/conferences_controller.rb

@@ -6,8 +6,11 @@ class ConferencesController < ApplicationController
   load_and_authorize_resource find_by: :short_title, except: :show
 
   def index
-    @current    = Conference.where('end_date >= ?', Date.current).reorder(start_date: :asc)
-    @antiquated = Conference.where('end_date < ?', Date.current)
+    @current    = Conference.upcoming.reorder(start_date: :asc)
+    @antiquated = Conference.past
+    if @antiquated.empty? && @current.empty? && User.empty?
+      render :new_install
+    end
   end
 
   def show
@@ -68,6 +71,47 @@ class ConferencesController < ApplicationController
     end
   end
 
+  def calendar
+    respond_to do |format|
+      format.ics do
+        calendar = Icalendar::Calendar.new
+        Conference.all.each do |conf|
+          if params[:full]
+            event_schedules = conf.program.selected_event_schedules(
+              includes: [{ event: %i[event_type speakers submitter] }]
+            )
+            calendar = icalendar_proposals(calendar, event_schedules.map(&:event), conf)
+          else
+            calendar.event do |e|
+              e.dtstart = conf.start_date
+              e.dtstart.ical_params = { 'VALUE'=>'DATE' }
+              e.dtend = conf.end_date
+              e.dtend.ical_params = { 'VALUE'=>'DATE' }
+              e.duration = "P#{(conf.end_date - conf.start_date + 1).floor}D"
+              e.created = conf.created_at
+              e.last_modified = conf.updated_at
+              e.summary = conf.title
+              e.description = conf.description
+              e.uid = conf.guid
+              e.url = conference_url(conf.short_title)
+              v = conf.venue
+              if v
+                e.geo = v.latitude, v.longitude if v.latitude && v.longitude
+                location = ''
+                location += "#{v.street}, " if v.street
+                location += "#{v.postalcode} #{v.city}, " if v.postalcode && v.city
+                location += v.country_name if v.country_name
+                e.location = location if location
+              end
+            end
+          end
+        end
+        calendar.publish
+        render inline: calendar.to_ical
+      end
+    end
+  end
+
   private
 
   def conference_finder_conditions