Allow applications to query if they've got loggers

This is required to avoid the problems in #17

Signed-off-by: Thom May <[email protected]>

lib/mixlib/log.rb

@@ -66,6 +66,7 @@ def use_log_devices(other)
           "You gave: #{other.inspect}"
         raise ArgumentError, msg
       end
+      @configured = true
     end
 
     # Use Mixlib::Log.init when you want to set up the logger manually.  Arguments to this method
@@ -80,9 +81,15 @@ def init(*opts)
       @logger = logger_for(*opts)
       @logger.formatter = Mixlib::Log::Formatter.new() if @logger.respond_to?(:formatter=)
       @logger.level = Logger::WARN
+      @configured = true
       @logger
     end
 
+    # Let the application query if logging objects have been set up
+    def configured?
+      @configured
+    end
+
     # Sets the level for the Logger object by symbol.  Valid arguments are:
     #
     #  :debug

spec/mixlib/log_spec.rb

@@ -79,6 +79,11 @@ def #{method_name}(message)
     expect(second_logdev.string).to match(/SECOND/)
   end
 
+  it "knows that it's been configured" do
+    Logit.init
+    expect(Logit.configured?).to be true
+  end
+
   it "should set the log level using the binding form,  with :debug, :info, :warn, :error, or :fatal" do
     levels = {
       :debug => Logger::DEBUG,