Add method complexity check to CI

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

.gitlab-ci.yml

@@ -73,3 +73,10 @@ brakeman:
   tags:
     - ruby
     - mysql
+
+flog:
+  script:
+    - bundle exec rake flog
+  tags:
+    - ruby
+    - mysql

Gemfile

@@ -259,6 +259,7 @@ group :development, :test do
   gem 'rubocop',  '~> 0.28.0',  require: false
   gem 'coveralls',  '~> 0.8.2', require: false
   gem 'simplecov', '~> 0.10.0', require: false
+  gem 'flog', require: false
 
   gem 'benchmark-ips', require: false
 end

Gemfile.lock

@@ -194,6 +194,9 @@ GEM
     ffi (1.9.10)
     fission (0.5.0)
       CFPropertyList (~> 2.2)
+    flog (4.3.2)
+      ruby_parser (~> 3.1, > 3.1.0)
+      sexp_processor (~> 4.4)
     flowdock (0.7.0)
       httparty (~> 0.7)
       multi_json
@@ -821,6 +824,7 @@ DEPENDENCIES
   enumerize (~> 0.7.0)
   factory_girl_rails (~> 4.3.0)
   ffaker (~> 2.0.0)
+  flog
   fog (~> 1.25.0)
   font-awesome-rails (~> 4.2)
   foreman

lib/tasks/flog.rake

+desc 'Code complexity analyze via flog'
+task :flog do
+  output = %x(bundle exec flog -m app/ lib/gitlab)
+  exit_code = 0
+  output = output.lines
+
+  # Skip total complexity score
+  output.shift
+
+  # Skip some trash info
+  output.shift
+
+  output.each do |line|
+    score, method = line.split(" ")
+    score = score.to_i
+
+    if score > 40
+      exit_code = 1
+      puts "High complexity in #{method}. Score: #{score}"
+    end
+  end
+
+  exit exit_code
+end