add colorize for logger

spec/logger_spec.cr

@@ -18,7 +18,6 @@ describe "Logger" do
     logger = Kemal::Logger.new
     logger.handler.should be_a File
   end
-  
   it "writes to a file in production" do
     config = Kemal.config
     config.env = "production"

src/kemal.cr

@@ -22,6 +22,8 @@ at_exit do
   logger.write "[#{config.env}] Kemal is ready to lead at #{config.scheme}://0.0.0.0:#{config.port}\n"
 
   Signal::INT.trap {
+    logger.write "Kemal is going to take a rest!\n"
+    logger.write "#{Time.now} - Bye Bye!\n\n"
     logger.handler.close
     server.close
     exit

src/kemal/logger.cr

@@ -1,3 +1,5 @@
+require "colorize"
+
 class Kemal::Logger < HTTP::Handler
   getter handler
 
@@ -17,7 +19,19 @@ class Kemal::Logger < HTTP::Handler
     response = call_next(request)
     elapsed = Time.now - time
     elapsed_text = elapsed_text(elapsed)
-    output_message = "#{request.method} #{request.resource} - #{response.status_code} (#{elapsed_text})\n"
+
+    if @env == "production"
+      status_code = " #{response.status_code} "
+      method = request.method
+    else
+      statusColor = color_for_status(response.status_code)
+      methodColor = color_for_method(request.method)
+
+      status_code = " #{response.status_code} ".colorize.back(statusColor).fore(:white)
+      method = request.method.colorize(methodColor)
+    end
+
+    output_message = "#{time} |#{status_code}| #{method} #{request.resource} - (#{elapsed_text})\n"
     write output_message
     response
   end
@@ -42,4 +56,37 @@ class Kemal::Logger < HTTP::Handler
       @handler.print message
     end
   end
+
+  private def color_for_status(code)
+    if code >= 200 && code < 300
+      return :green
+    elsif code >= 300 && code < 400
+      return :magenta
+    elsif code >= 400 && code < 500
+      return :yellow
+    else
+      return :default
+    end
+  end
+
+  private def color_for_method(method)
+    case method
+    when "GET"
+      return :blue
+    when "POST"
+      return :cyan
+    when "PUT"
+      return :yellow
+    when "DELETE"
+      return :red
+    when "PATCH"
+      return :green
+    when "HEAD"
+      return :magenta
+    when "OPTIONS"
+      return :white
+    else
+      return :default
+    end
+  end
 end