.rubocop.yml in peppermint-0.1.14 vs .rubocop.yml in peppermint-0.1.15

@@ -1,25 +1,33 @@
+<% 
+require "open3"
+def gem_exists(gem)
+  res = Open3.popen3("bundle", "info", "^#{gem}$") do |i, o, e, t|
+    t.value.success?
+  end
+end
+%>
 ---
 inherit_mode:
   merge:
     - Exclude
 
 require:
   - standard
-  - standard-rails
+  <%= "- standard-rails" if gem_exists "rails" %>
   - standard-custom
   - standard-performance
   - rubocop-performance
   - rubocop-rake
-  - rubocop-rspec
-  - rubocop-rails
-  - rubocop-rspec_rails
-  - rubocop-capybara
-
+  <%= "- rubocop-rspec" if gem_exists "rspec" %>
+  <%= "- rubocop-rails" if gem_exists "rails" %>
+  <%= "- rubocop-rspec_rails" if gem_exists "rails" %>
+  <%= "- rubocop-capybara" if gem_exists "capybara" %>
+ 
 inherit_gem:
-  standard: config/base.yml
-  standard-rails: config/base.yml
+  standard: config/base.yml  
+  <%= "standard-rails: config/base.yml" if gem_exists "rails" %>
   standard-performance: config/base.yml
   standard-custom: config/base.yml
 
 # custom enables/disables
 Layout/LineLength:
@@ -28,13 +36,17 @@
   AllowAdjacentOneLineDefs: true
 Style/DisableCopsWithinSourceCodeDirective:
   Enabled: true
 Rake/Desc:
   Enabled: false
+<%
+<<RSPEC if gem_exists "rspec"
 RSpec/MultipleExpectations:
   Enabled: false
 RSpec/ExampleLength:
   Enabled: false
+RSPEC
+%>
 
 #
 # Ignore differences from Rails autogeneration
 #
 Layout/SpaceInsideHashLiteralBraces: