add graceful shutdown

folder.rb

@@ -19,6 +19,10 @@ class Folder
     end
   end
 
+  def close()
+    self.update()
+  end
+
   def num_subs()
     @submissions.length
   end

main.rb

@@ -10,6 +10,8 @@ require 'logger'
 require 'astro/moon'
 require './folder.rb'
 
+
+
 logger = Logger.new(STDOUT)
 logger.level = Logger::INFO
 
@@ -17,6 +19,16 @@ config_obj = YAML::load_file( './config.yaml' )
 logger.info("loaded config")
 bot = Discordrb::Commands::CommandBot.new token: config_obj["bot_token"], prefix: "!folder"
 folder = Folder.new
+
+def shutdown
+  log.info("shutting down")
+  if bot.connected
+    bot.stop
+  end
+  folder.close
+end
+
+
 config_obj['steves'].each do |steve|
   folder.add_steve(steve)
 end
@@ -89,7 +101,17 @@ bot.message(private: true) do |event|
   folder.update()
 end
 
+#set up signals
+Signal.trap("INT") { 
+  shut_down
+  exit
+}
 
+# Trap `Kill `
+Signal.trap("TERM") {
+  shut_down
+  exit
+}
 
 
 logger.info("Logging into discord")