Without any arguments display the average over the last week

mood

@@ -2,13 +2,20 @@
 
 require 'pp'
 require 'chronic'
+require 'csv'
+require 'date'
 
 DEBUG = false
 
 moodfile = "#{ENV['HOME']}/.mood"
 
 if ARGV.empty?
-  system("tail #{moodfile}")
+  csv = CSV.read(moodfile)
+  last_week =  Date.today - 6
+  pp csv
+  moods = csv.select{|d| d[0] && DateTime.parse(d[0]) > last_week }.collect{|d| d[1].to_i }
+  avg = moods.sum / moods.count.to_f
+  puts "Your mood in the last week was #{avg.round} with #{moods.count} entries"
   return
 end