Add an animation to comfort the user

Sometimes msfconsole takes a little while to start.

This adds a fairly common ASCII spinner to the startup sequence.

I haven't spec'ed it, and the code organization isn't great, so consider
this PR more of a cry for help than something immediately landable.

That said, it works for me.

lib/metasploit/framework/command/console.rb

@@ -7,11 +7,25 @@ require 'metasploit/framework/command/base'
 
 # Based on pattern used for lib/rails/commands in the railties gem.
 class Metasploit::Framework::Command::Console < Metasploit::Framework::Command::Base
+
+  def spinner(bool=true)
+    return if $msf_spinner_thread
+    $msf_spinner_thread = Thread.new do
+      loop do
+        %q{/-\|}.each_char do |c|
+          $stdout.print c
+          $stdout.print "\b"
+        end
+      end
+    end
+  end
+
   def start
     case parsed_options.options.subcommand
     when :version
       $stderr.puts "Framework Version: #{Metasploit::Framework::VERSION}"
     else
+      spinner
       driver.run
     end
   end

lib/msf/ui/console/driver.rb

@@ -535,6 +535,11 @@ class Driver < Msf::Ui::Driver
 
     framework.events.on_ui_start(Msf::Framework::Revision)
 
+    if $msf_spinner_thread
+      $msf_spinner_thread.kill
+      $stdout.print "\n"
+    end
+
     run_single("banner") unless opts['DisableBanner']
 
     opts["Plugins"].each do |plug|

msfconsole

@@ -45,4 +45,6 @@ end
 require Pathname.new(__FILE__).realpath.expand_path.parent.join('config', 'boot')
 require 'metasploit/framework/command/console'
 
+$stdout.print "[*] Starting the Metasploit Framework console..."
 Metasploit::Framework::Command::Console.start
+$stdout.puts "[*] Metasploit Framework console session ended"