rules:
  - id: missing-language-field
    message: >-
      Please include a 'languages' field for your rule $RULEID!
    languages: [yaml]
    pattern-either:
      # non join mode
      - patterns:
          - pattern-inside: "rules: [..., $RULE, ...]"
          - pattern: "id: $RULEID"
          - pattern-not-inside: |
              - ...
                languages: ...
          - pattern-not-inside: |
              - ...
                mode: join
      # join mode
      - patterns:
          - pattern-inside: |
              rules: [ ..., $OUTER_RULE, ...]
          - pattern-inside: $OUTER_RULE
          - pattern-inside: |
              id: $OUTER_RULEID
              mode: join
              join:
                rules: [ ..., $INNER_RULE, ...]
                ...
              ...
          - pattern-inside: $INNER_RULE
          - pattern-not-inside: |
              - languages: ...
                ...
          - pattern: |
              id: $RULEID
    severity: WARNING
    metadata:
      references:
        - https://semgrep.dev/docs/writing-rules/rule-syntax/#required
      category: correctness
      technology:
        - semgrep