[WIP] Allow users to include other configuration files.

README.md

@@ -383,6 +383,10 @@ In case you have to have one or more configuration files in the directory (e.g.
 toying around with different, mutually exclusive settings) you need to tell Reek
 explicitly which file to use via `reek -c config.reek`.
 
+### Including other configuration files
+
+TODO
+
 ### Source code comments
 
 In case you need to suppress a smell warning and you can't or don't want to

features/configuration_files/include_other_configuration_files.feature

@@ -0,0 +1,55 @@
+Feature: Include other configuration files
+  In order to give users more flexibility when it comes to configuration files
+  we want to make it possible to include other configuration files into the main
+  configuration file.
+
+  Scenario: Include other configuration files
+    Given a file named "smelly.rb" with:
+      """
+        class Smelly # IrresponsibleModule
+          # UncommunicativeMethodName
+          def x(y) # UncommunicativeParameterName and UnusedParameter
+            z = 10 # UncommunicativeVariableName
+          end
+        end
+      """
+    And a file named ".reek.yml" with:
+      """
+      ---
+      detectors:
+        IrresponsibleModule:
+          enabled: false
+      include:
+        - second_config.yml
+        - third_config.yml
+      """
+    And a file named "second_config.yml" with:
+      """
+      ---
+      detectors:
+        UncommunicativeMethodName:
+          enabled: false
+      """
+    And a file named "third_config.yml" with:
+      """
+      ---
+      detectors:
+        UncommunicativeVariableName:
+          enabled: false
+      """
+
+    When I run reek smelly.rb
+    Then it reports:
+    """
+    smelly.rb -- 2 warnings:
+      [3]:UncommunicativeParameterName: Smelly#x has the parameter name 'y'
+      [3]:UnusedParameters: Smelly#x has unused parameter 'y'
+    """
+
+  Scenario: Included file has additional include directives
+
+  Scenario: Other configuration file overwrites configuration in the main configuration
+
+  Scenario: Other configuration file does not exist
+
+  Scenario: Other configuration file contains a syntax error

lib/reek.rb

@@ -12,4 +12,5 @@ module Reek
   DETECTORS_KEY = 'detectors'
   EXCLUDE_PATHS_KEY = 'exclude_paths'
   DIRECTORIES_KEY = 'directories'
+  INCLUDE_KEY = 'include'
 end

lib/reek/configuration/app_configuration.rb

@@ -78,6 +78,8 @@ def load_values(values)
             directory_directives.add value
           elsif key == DETECTORS_KEY
             default_directive.add value
+          elsif key == INCLUDE_KEY
+            # TODO: Magic happens here.
           end
         end
       end

lib/reek/configuration/schema.yml

@@ -203,8 +203,13 @@ mapping:
       =:
         type: map
         mapping: *all_detectors
-        
+
   "exclude_paths":
     type: seq
     sequence:
       - type: str
+
+  "include":
+    type: seq
+    sequence:
+      - type: str