Initial commit

.clang-format

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+BasedOnStyle: LLVM
+UseTab: Never

.gitattributes

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+*.h linguist-language=C++

.gitignore

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+build/
+.idea/
+.vscode/
+.DS_Store

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.20)
+project(ClangTidyPlugin C CXX)
+find_package(LLVM REQUIRED)
+find_package(Clang REQUIRED)
+add_library(ClangTidyPlugin MODULE MyClangTidyPluginModule.cpp MyCheck.cpp)
+target_compile_features(ClangTidyPlugin PRIVATE cxx_std_17)
+target_include_directories(ClangTidyPlugin PRIVATE ${LLVM_INCLUDE_DIRS} ${CLANG_INCLUDE_DIRS})
+target_link_libraries(ClangTidyPlugin PRIVATE clangTidy)

MyCheck.cpp

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+#include "MyCheck.h"
+
+namespace clang::tidy::MyPlugin {
+
+using namespace ast_matchers;
+
+MyCheck::MyCheck(StringRef Name, ClangTidyContext *Context)
+    : ClangTidyCheck(Name, Context) {}
+
+void MyCheck::registerMatchers(MatchFinder *Finder) {
+  Finder->addMatcher(
+      callExpr(callee(functionDecl(hasName("foo")))).bind("fooCall"), this);
+}
+
+void MyCheck::check(const MatchFinder::MatchResult &Result) {
+  const auto *fooCall = Result.Nodes.getNodeAs<CallExpr>("fooCall");
+  if (!fooCall) {
+    return;
+  }
+  diag(fooCall->getBeginLoc(), "Calling deprecated API foo() is discouraged");
+}
+
+} // namespace clang::tidy::MyPlugin

MyCheck.h

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+#pragma once
+
+#include <clang-tidy/ClangTidyCheck.h>
+
+namespace clang::tidy::MyPlugin {
+
+class MyCheck : public ClangTidyCheck {
+public:
+  explicit MyCheck(StringRef Name, ClangTidyContext *Context);
+
+  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+};
+
+} // namespace clang::tidy::MyPlugin

MyClangTidyPluginModule.cpp

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+#include <clang-tidy/ClangTidyModule.h>
+#include <clang-tidy/ClangTidyModuleRegistry.h>
+
+#include "MyCheck.h"
+
+namespace clang::tidy::MyPlugin {
+
+class MyClangTidyPluginModule : public ClangTidyModule {
+public:
+  void addCheckFactories(ClangTidyCheckFactories &CheckFactories) override {
+    CheckFactories.registerCheck<MyCheck>("my-check");
+  }
+};
+
+[[maybe_unused]] static ClangTidyModuleRegistry::Add<MyClangTidyPluginModule>
+    X("my-module", "Adds checks in my plugin.");
+
+} // namespace clang::tidy::MyPlugin

test/foo.cpp

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+void foo();
+void bar();
+
+void host() { foo(); }