Implement verbose mode

lib/uh/wm/cli.rb

@@ -48,6 +48,11 @@ module Uh
             @env.print opts
             exit
           end
+
+          opts.on '-v', '--version', 'enable verbose mode' do
+            @env.verbose = true
+            @env.log_logger_level
+          end
         end
       end
     end

lib/uh/wm/env.rb

@@ -1,26 +1,33 @@
 module Uh
   module WM
     class Env
+      LOGGER_LEVEL          = Logger::WARN
+      LOGGER_LEVEL_VERBOSE  = Logger::INFO
       LOGGER_LEVEL_STRINGS = %w[DEBUG INFO WARN ERROR FATAL UNKNOWN]
 
       extend Forwardable
-      def_delegator :@logger, :info, :log
+      def_delegator :logger, :info, :log
       def_delegator :@output, :print
 
-      attr_reader   :output, :logger
+      attr_reader   :output
       attr_accessor :verbose
 
-      def initialize output, logger: Logger.new(output)
+      def initialize output
         @output = output
-        @logger = logger
       end
 
       def verbose?
         !!@verbose
       end
 
+      def logger
+        @logger ||= Logger.new(@output).tap do |o|
+          o.level = verbose? ? LOGGER_LEVEL_VERBOSE : LOGGER_LEVEL
+        end
+      end
+
       def log_logger_level
-        log "Logging at #{LOGGER_LEVEL_STRINGS[@logger.level]} level"
+        log "Logging at #{LOGGER_LEVEL_STRINGS[logger.level]} level"
       end
     end
   end