Fix some clang-format lints + tool polyfill

CMakeLists.txt

@@ -13,6 +13,22 @@ project(minja VERSION 1.0.0 LANGUAGES CXX)
 
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
+# Test if clang-tidy is available
+find_program(CLANG_TIDY_EXE NAMES "clang-tidy")
+if (CLANG_TIDY_EXE)
+    message(STATUS "clang-tidy found: ${CLANG_TIDY_EXE}")
+    set(CMAKE_CXX_CLANG_TIDY
+        clang-tidy;
+        -header-filter=include/minja/.*;
+        # https://clang.llvm.org/extra/clang-tidy/checks/list.html
+        # TODO: enable more / disable less checks: google-*,misc-*,modernize-*,performance-*
+        -checks=-*,clang-analyzer-*,clang-diagnostic-*,cppcoreguideline-*,bugprone-*,-bugprone-suspicious-include,-bugprone-assignment-in-if-condition,-bugprone-narrowing-conversions,-bugprone-easily-swappable-parameters,-bugprone-inc-dec-in-conditions,-bugprone-exception-escape,-clang-analyzer-cplusplus.StringChecker;
+        -warnings-as-errors=*;
+    )
+else()
+    message(STATUS "clang-tidy not found")
+endif()
+
 if (MSVC)
     set(MINJA_FUZZTEST_ENABLED_DEFAULT OFF)
     set(MINJA_USE_VENV_DEFAULT OFF)

README.md

@@ -166,6 +166,8 @@ Main limitations (non-exhaustive list):
         ctest --test-dir build -j --output-on-failure
     ```
 
+- Bonus: install `clang-tidy` before building (on MacOS: `brew install llvm ; sudo ln -s "$(brew --prefix llvm)/bin/clang-tidy" "/usr/local/bin/clang-tidy"`)
+
 - Fuzzing tests
 
     - Note: `fuzztest` **[doesn't work](https://github.com/google/fuzztest/issues/179)** natively on Windows or MacOS.

include/minja/chat-template.hpp

@@ -10,6 +10,13 @@
 
 #include "minja.hpp"
 
+#include <chrono>
+#include <cstddef>
+#include <cstdio>
+#include <exception>
+#include <iomanip>
+#include <memory>
+#include <sstream>
 #include <string>
 #include <vector>
 
@@ -427,7 +434,7 @@ class chat_template {
                         auto obj = json {
                             {"tool_calls", tool_calls},
                         };
-                        if (!content.is_null() && content != "") {
+                        if (!content.is_null() && !content.empty()) {
                             obj["content"] = content;
                         }
                         message["content"] = obj.dump(2);
@@ -437,13 +444,12 @@ class chat_template {
                 if (polyfill_tool_responses && role == "tool") {
                     message["role"] = "user";
                     auto obj = json {
-                        {"tool_response", {
-                            {"content", message.at("content")},
-                        }},
+                        {"tool_response", json::object()},
                     };
                     if (message.contains("name")) {
-                        obj["tool_response"]["name"] = message.at("name");
+                        obj["tool_response"]["tool"] = message.at("name");
                     }
+                    obj["tool_response"]["content"] = message.at("content");
                     if (message.contains("tool_call_id")) {
                         obj["tool_response"]["tool_call_id"] = message.at("tool_call_id");
                     }
@@ -512,7 +518,7 @@ class chat_template {
     static nlohmann::ordered_json add_system(const nlohmann::ordered_json & messages, const std::string & system_prompt) {
         json messages_with_system = messages;
 
-        if (messages_with_system.size() > 0 && messages_with_system[0].at("role") == "system") {
+        if (!messages_with_system.empty() && messages_with_system[0].at("role") == "system") {
             std::string existing_system = messages_with_system.at(0).at("content");
             messages_with_system[0] = json {
                 {"role", "system"},