Issue bot - special NotAnalysedTraitRule that runs even with onlyFile…

…s=true

issue-bot/playground.neon

@@ -1,3 +1,4 @@
 rules:
 	- PHPStan\Rules\Playground\FunctionNeverRule
 	- PHPStan\Rules\Playground\MethodNeverRule
+	- PHPStan\Rules\Playground\NotAnalysedTraitRule

src/Rules/Playground/NotAnalysedTraitRule.php

@@ -0,0 +1,61 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Rules\Playground;
+
+use PhpParser\Node;
+use PHPStan\Analyser\Scope;
+use PHPStan\Node\CollectedDataNode;
+use PHPStan\Rules\Rule;
+use PHPStan\Rules\RuleErrorBuilder;
+use PHPStan\Rules\Traits\TraitDeclarationCollector;
+use PHPStan\Rules\Traits\TraitUseCollector;
+use function sprintf;
+use function strtolower;
+
+/**
+ * @implements Rule<CollectedDataNode>
+ */
+class NotAnalysedTraitRule implements Rule
+{
+
+	public function getNodeType(): string
+	{
+		return CollectedDataNode::class;
+	}
+
+	public function processNode(Node $node, Scope $scope): array
+	{
+		$traitDeclarationData = $node->get(TraitDeclarationCollector::class);
+		$traitUseData = $node->get(TraitUseCollector::class);
+
+		$declaredTraits = [];
+		foreach ($traitDeclarationData as $file => $declaration) {
+			foreach ($declaration as [$name, $line]) {
+				$declaredTraits[strtolower($name)] = [$file, $name, $line];
+			}
+		}
+
+		foreach ($traitUseData as $usedNamesData) {
+			foreach ($usedNamesData as $usedNames) {
+				foreach ($usedNames as $usedName) {
+					unset($declaredTraits[strtolower($usedName)]);
+				}
+			}
+		}
+
+		$errors = [];
+		foreach ($declaredTraits as [$file, $name, $line]) {
+			$errors[] = RuleErrorBuilder::message(sprintf(
+				'Trait %s is used zero times and is not analysed.',
+				$name,
+			))
+				->file($file)
+				->line($line)
+				->tip('See: https://phpstan.org/blog/how-phpstan-analyses-traits')
+				->build();
+		}
+
+		return $errors;
+	}
+
+}