Add option to suppress xcodebuild output

lib/gym/generators/build_command_generator.rb

@@ -58,7 +58,11 @@ def suffix
       end
 
       def pipe
-        ["| tee '#{xcodebuild_log_path}' | xcpretty"]
+        pipe = []
+        pipe << "| tee '#{xcodebuild_log_path}' | xcpretty"
+        pipe << "> /dev/null" if Gym.config[:suppress_xcode_output]
+
+        pipe
       end
 
       def xcodebuild_log_path

lib/gym/options.rb

@@ -152,7 +152,14 @@ def self.plain_options
                                      optional: true,
                                      verify_block: proc do |value|
                                        raise "File not found at path '#{File.expand_path(value)}'".red unless File.exist?(value)
-                                     end)
+                                     end),
+        FastlaneCore::ConfigItem.new(key: :suppress_xcode_output,
+                                     short_option: "-r",
+                                     env_name: "SUPPRESS_OUTPUT",
+                                     description: "Suppress the output of xcodebuild to stdout. Output is still saved in buildlog_path",
+                                     optional: true,
+                                     is_string: false
+                                     )
       ]
     end
   end