Introduce debug? method for log filtering

lib/airbrussh/formatter.rb

@@ -67,6 +67,8 @@ def write(obj)
         print_line "#{clock} #{blue(new_rake_task)}"
       end
 
+      return if debug?(obj)
+
       case obj
       when SSHKit::Command    then write_command(obj)
       when SSHKit::LogMessage then write_log_message(obj)
@@ -88,6 +90,10 @@ def on_deploy_failure
 
     private
 
+    def debug?(obj)
+      obj.respond_to?(:verbosity) && obj.verbosity <= SSHKit::Logger::DEBUG
+    end
+
     def record_new_rake_task
       if @tasks[@current_rake_task].nil?
         @tasks[@current_rake_task] = []
@@ -101,14 +107,10 @@ def record_first_execution?(shell_string)
     end
 
     def write_log_message(log_message)
-      return unless log_message.verbosity >= SSHKit::Logger::INFO
-
       print_line(light_black("      " + log_message.to_s))
     end
 
     def write_command(command)
-      return unless command.verbosity > SSHKit::Logger::DEBUG
-
       shell_string = shell_string(command)
       if record_first_execution?(shell_string)
         print_line "      #{number(command)} #{yellow(shell_string)}"