rules:
- id: useless-inner-function
  patterns:
  - pattern-not-inside: |
      def $F(...):
          ...
          def $FF(...):
             ...
          ...
          <... $FF ...>
  - pattern-not-inside: |
      def $F(...):
          ...
          class $CLAZZ(...):
            ...
  - pattern-inside: |
      def $F(...):
        ...
        def $FF(...):
           ...
        ...
  - pattern: |
      def $FF(...):
        ...
  - pattern-not: |
      @$DECORATOR
      def $FF(...):
        ...
  message: function `$FF` is defined inside a function but never used
  languages:
  - python
  severity: ERROR
  metadata:
    category: maintainability
    technology:
    - python
    license: Commons Clause License Condition v1.0[LGPL-2.1-only]