[clang] [clang-tools-extra] [clang-tidy] Add readability-avoid-default-lambda-capture (PR #160150)

[Piotr Zegar via cfe-commits]

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@@ -0,0 +1,67 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "AvoidDefaultLambdaCaptureCheck.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "clang/Basic/Lambda.h"
+#include "clang/Lex/Lexer.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang::tidy::readability {
+
+static std::string generateCaptureText(const LambdaCapture &Capture) {
+  if (Capture.capturesThis())
+    return Capture.getCaptureKind() == LCK_StarThis ? "*this" : "this";
+
+  std::string Result;
+  if (Capture.getCaptureKind() == LCK_ByRef)
+    Result += "&";
+
+  Result += Capture.getCapturedVar()->getName().str();
+  return Result;
+}
+
+void AvoidDefaultLambdaCaptureCheck::registerMatchers(MatchFinder *Finder) {
+  Finder->addMatcher(lambdaExpr(hasDefaultCapture()).bind("lambda"), this);
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PiotrZSL wrote:

consider excluding system headers.

https://github.com/llvm/llvm-project/pull/160150