rules:
  info-title-required:
    description: Info title must be present
    severity: error
    given: $.info
    then: {field: title, function: truthy}
  info-description-required:
    description: Info description must be present
    severity: error
    given: $.info
    then: {field: description, function: truthy}
  info-license-required:
    description: Info license must be present (Gutendex is MIT licensed)
    severity: warn
    given: $.info
    then: {field: license, function: truthy}
  operation-operationid-required:
    description: Every operation must have an operationId
    severity: error
    given: $.paths[*][get,post,put,patch,delete]
    then: {field: operationId, function: truthy}
  operation-summary-required:
    description: Every operation must have a summary
    severity: error
    given: $.paths[*][get,post,put,patch,delete]
    then: {field: summary, function: truthy}
  operation-summary-title-case:
    description: Operation summaries should be Title Case
    severity: warn
    given: $.paths[*][get,post,put,patch,delete].summary
    then:
      function: pattern
      functionOptions:
        match: '^([A-Z][a-z0-9]*)(\s+([A-Z][a-z0-9]*|[a-z]{1,3}))*$'
  operation-tags-required:
    description: Every operation must have tags
    severity: error
    given: $.paths[*][get,post,put,patch,delete]
    then: {field: tags, function: truthy}
  operation-description-required:
    description: Every operation must have a description
    severity: warn
    given: $.paths[*][get,post,put,patch,delete]
    then: {field: description, function: truthy}
  response-description-required:
    description: Every response must have a description
    severity: error
    given: $.paths[*][get,post,put,patch,delete].responses[*]
    then: {field: description, function: truthy}
  no-empty-descriptions:
    description: Descriptions must not be empty
    severity: error
    given: $..description
    then: {function: truthy}
  servers-required:
    description: At least one server must be declared
    severity: error
    given: $
    then: {field: servers, function: truthy}
  path-kebab-case:
    description: Path segments should be lowercase (Gutendex uses /books and /books/{id})
    severity: warn
    given: $.paths.*~
    then:
      function: pattern
      functionOptions:
        match: '^(/[a-z0-9_{}-]+)+$'
  schema-component-references:
    description: Prefer $ref to component schemas for Book, Person, Format, BookList, Error
    severity: info
    given: $.paths[*][get,post,put,patch,delete].responses[*].content[*].schema
    then:
      function: truthy