Email tariffs daily

app/helpers/TariffsMailer.rb

@@ -0,0 +1,46 @@
+require "mail"
+
+class TariffsMailer
+    
+  SSL_OPTS = {
+                :openssl_verify_mode => OpenSSL::SSL::VERIFY_NONE,
+  }  
+  
+                   
+  #
+  # Class methods
+  #
+  class << self
+    def deliver(date)     
+      # Read SMTP options from smtp.yml
+      smtp_opts = YAML::load(File.open('config/smtp.yml')).symbolize_keys
+      smtp_opts.merge!(SSL_OPTS) if smtp_opts[:ssl] && smtp_opts[:ssl_verify_mode].eql?("none")
+      
+      # Create png file
+      c = Cost.new
+      c.easy_energy_tariff_barplot(Date.today)
+      
+      mail = Mail.new do
+        delivery_method :smtp, smtp_opts
+        to      'a.t.van.halteren@vu.nl'
+        from    'SmartMeter <aart@van-halteren.net>'
+        subject "EasyEnergy tariffs for #{date}"
+
+        text_part do
+          body "Tariffs for #{date}\n"
+        end
+      
+        html_part do
+          content_type 'text/html; charset=UTF-8'
+          body "<h1>Tariffs for #{date}"
+        end 
+        
+        # add attachment
+        filename = "easy_tariff_%s.png" % date.strftime("%F")
+        add_file :filename => filename, :content => File.read("plots/%s" % filename) 
+      end
+      
+      mail.deliver!
+    end
+  end
+end

app/models/cost.rb

@@ -90,7 +90,7 @@ class Cost
     title = "Tarief per kwH (incl. belastingen en BTW) - %s" % date.strftime("%A, %e %B %Y")
     xlabel = "uur"
     ylabel = "EUR"
-    GR.savefig("easy_tariff_%s.png" % date.strftime("%F"), title: title, xlabel: xlabel, ylabel: ylabel)
+    GR.savefig("plots/easy_tariff_%s.png" % date.strftime("%F"), title: title, xlabel: xlabel, ylabel: ylabel)
   end
   
   def easy_energy_cost_barplot(date)