Add clang-tidy configuration and watch script for improved code quality checks

CMakeLists.txt

@@ -22,6 +22,8 @@ include("${DEVKITPRO_CMAKE}")
 
 project(snakePlus LANGUAGES C CXX ASM)
 
+option(ENABLE_CLANG_TIDY "Enable clang-tidy checks" OFF)
+
 # Export compile_commands.json for tooling (clangd, IntelliSense, static analysis).
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
@@ -30,6 +32,24 @@ set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS ON)
 
+if(ENABLE_CLANG_TIDY)
+        find_program(CLANG_TIDY_EXE NAMES clang-tidy)
+        if(NOT CLANG_TIDY_EXE)
+                message(FATAL_ERROR "ENABLE_CLANG_TIDY is ON, but clang-tidy was not found")
+        endif()
+
+        set(CMAKE_C_CLANG_TIDY
+                ${CLANG_TIDY_EXE}
+                --header-filter=^(include|source)/
+                --extra-arg=--target=arm-none-eabi
+        )
+        set(CMAKE_CXX_CLANG_TIDY
+                ${CLANG_TIDY_EXE}
+                --header-filter=^(include|source)/
+                --extra-arg=--target=arm-none-eabi
+        )
+endif()
+
 set(TARGET_NAME ${PROJECT_NAME})
 
 set(GAME_TITLE "Snake Plus")
@@ -122,6 +142,15 @@ target_compile_definitions(${TARGET_NAME} PRIVATE
 target_compile_options(${TARGET_NAME} PRIVATE
         -g
         -Wall
+        -Wextra
+        -Wpedantic
+        -Wconversion
+        -Wsign-conversion
+        -Wshadow
+        -Wformat=2
+        -Wundef
+        -Wnull-dereference
+        -Wimplicit-fallthrough
         -O3
         -marm
         -mthumb-interwork