Check every used internal violation reason for a pending period

.sourcery/PrimaryRuleList.stencil

@@ -1,4 +1,8 @@
+
 /// The rule list containing all available rules built into SwiftLint.
-public let primaryRuleList = RuleList(rules: [
+let builtInRules: [Rule.Type] = [
 {% for rule in types.structs where rule.name|hasSuffix:"Rule" or rule.name|hasSuffix:"Rules" %}    {{ rule.name }}.self{% if not forloop.last %},{% endif %}
-{% endfor %}] + extraRules())
+{% endfor %}]
+
+/// The rule list containing all available rules built into SwiftLint as well as native custom rules.
+public let primaryRuleList = RuleList(rules: builtInRules + extraRules())

Source/SwiftLintFramework/Models/PrimaryRuleList.swift

@@ -1,7 +1,8 @@
-// Generated using Sourcery 1.9.0 — https://github.com/krzysztofzablocki/Sourcery
+// Generated using Sourcery 1.9.2 — https://github.com/krzysztofzablocki/Sourcery
 // DO NOT EDIT
+
 /// The rule list containing all available rules built into SwiftLint.
-public let primaryRuleList = RuleList(rules: [
+let builtInRules: [Rule.Type] = [
     AccessibilityLabelForImageRule.self,
     AccessibilityTraitForButtonRule.self,
     AnonymousArgumentInMultilineClosureRule.self,
@@ -223,4 +224,7 @@ public let primaryRuleList = RuleList(rules: [
     XCTFailMessageRule.self,
     XCTSpecificMatcherRule.self,
     YodaConditionRule.self
-] + extraRules())
+]
+
+/// The rule list containing all available rules built into SwiftLint as well as native custom rules.
+public let primaryRuleList = RuleList(rules: builtInRules + extraRules())

Source/SwiftLintFramework/Models/StyleViolation.swift

@@ -28,7 +28,8 @@ public struct StyleViolation: CustomStringConvertible, Equatable, Codable {
     /// - parameter ruleDescription: The description of the rule that generated this violation.
     /// - parameter severity:        The severity of this violation.
     /// - parameter location:        The location of this violation.
-    /// - parameter reason:          The justification for this violation.
+    /// - parameter reason:          The justification for this violation. If not specified the rule's description will
+    ///                              be used.
     public init(ruleDescription: RuleDescription,
                 severity: ViolationSeverity = .warning,
                 location: Location,
@@ -39,6 +40,15 @@ public struct StyleViolation: CustomStringConvertible, Equatable, Codable {
         self.severity = severity
         self.location = location
         self.reason = reason ?? ruleDescription.description
+        #if DEBUG
+        if self.reason.trimmingTrailingCharacters(in: .whitespaces).last == ".",
+           builtInRules.contains(where: { rule in rule.description.identifier == self.ruleIdentifier }) {
+            queuedFatalError("""
+                Reasons shall not end with a period. Got "\(self.reason)". Either rewrite the rule's description \
+                or set a custom reason in the StyleViolation's constructor.
+                """)
+        }
+        #endif
     }
 
     /// Returns the same violation, but with the `severity` that is passed in

Tests/GeneratedTests/GeneratedTests.swift

@@ -1,4 +1,4 @@
-// Generated using Sourcery 1.9.0 — https://github.com/krzysztofzablocki/Sourcery
+// Generated using Sourcery 1.9.2 — https://github.com/krzysztofzablocki/Sourcery
 // DO NOT EDIT
 @_spi(TestHelper)
 @testable import SwiftLintFramework