feat: introduce gtest unit testing

CMakeLists.txt

@@ -1,19 +1,11 @@
 cmake_minimum_required(VERSION 3.12)
 
-project(gifscript CXX)
+project(gifscript CXX C)
 
 set(CMAKE_CXX_STANDARD 23)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_SOURCE_DIR})
 
-# Using CMAKE_CXX_STANDARD doesn't work for GCC...
-# This also doesn't work for Clang 14...
-if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
-  set(CPP_23_ARG "-std=c++2b")
-elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
-  set(CPP_23_ARG "-std=c++23")
-endif()
-
 find_package(RAGEL REQUIRED)
 
 set(CORE_DIR ${CMAKE_SOURCE_DIR}/core)
@@ -45,9 +37,11 @@ RAGEL_TARGET(gifscript
   COMPILE_FLAGS -G2
 )
 
+set_source_files_properties(parser.cpp PROPERTIES COMPILE_FLAGS "-Wno-unused-variable")
+
 set(GENERATED_SOURCES
   ${CMAKE_CURRENT_BINARY_DIR}/parser.h
-  ${CMAKE_CURRENT_BINARY_DIR}/parser.c
+  ${CMAKE_CURRENT_BINARY_DIR}/parser.cpp
   ${RAGEL_gifscript_OUTPUTS}
 )
 
@@ -64,6 +58,7 @@ set(CORE_SOURCES
   ${CORE_INCLUDE}/logger.hpp
   ${CORE_INCLUDE}/machine.hpp
   ${CORE_INCLUDE}/registers.hpp
+  ${CORE_SRC}/logger.cpp
   ${CORE_SRC}/machine.cpp
   ${CORE_SRC}/registers.cpp
 )
@@ -93,16 +88,22 @@ execute_process(
 
 string(CONCAT GIT_VERSION "\"" ${GIT_VERSION} "\"")
 message("git version: ${GIT_VERSION}")
-target_compile_options(gifscript_core PRIVATE -Wall -Werror -Wno-unused-const-variable ${CPP_23_ARG})
-target_compile_options(gifscript PRIVATE -DGIT_VERSION=${GIT_VERSION} -Wall -Werror -Wno-unused-const-variable ${CPP_23_ARG})
-target_compile_options(tpircsfig PRIVATE -DGIT_VERSION=${GIT_VERSION} -Wall -Werror -Wno-unused-const-variable ${CPP_23_ARG})
+target_compile_options(gifscript_core PRIVATE -Wall -Werror -Wno-unused-const-variable)
+target_compile_options(gifscript PRIVATE -DGIT_VERSION=${GIT_VERSION} -Wall -Werror -Wno-unused-const-variable)
+target_compile_options(tpircsfig PRIVATE -DGIT_VERSION=${GIT_VERSION} -Wall -Werror -Wno-unused-const-variable)
 
 target_include_directories(gifscript PUBLIC ${fmt_SOURCE_DIR}/include)
 target_link_libraries(gifscript_core PUBLIC fmt::fmt)
 
 add_custom_command(
-    OUTPUT parser.c parser.h
-    COMMAND lemon -q ${CORE_SRC}/parser.y -d${CMAKE_CURRENT_BINARY_DIR} ${LEMON_PARSER_TEMPLATE}
+    OUTPUT parser.cpp parser.h
+    COMMAND lemon -q ${CORE_SRC}/parser.y -d${CMAKE_CURRENT_BINARY_DIR} && mv parser.c parser.cpp && sed -i 's/parser.c/parser.cpp/g' parser.cpp
     DEPENDS ${CORE_SRC}/parser.y
     USES_TERMINAL
 )
+
+if(NOT DISABLE_TESTS)
+  include(CTest)
+  enable_testing()
+  add_subdirectory(tests)
+endif()

backends/include/backend.hpp

@@ -15,3 +15,31 @@ class Backend
 
 	virtual void emit(GIFBlock& block) = 0;
 };
+
+class DummyBackend : public Backend
+{
+public:
+	DummyBackend() = default;
+	~DummyBackend() override = default;
+
+	bool arg_parse(int argc, char** argv) override
+	{
+		return true;
+	}
+
+	void set_output(const std::string_view& output) override
+	{
+		(void)output;
+	}
+
+	void print_help() const override
+	{
+	}
+
+	void emit(GIFBlock& block) override
+	{
+		(void)block;
+	}
+};
+
+static DummyBackend dummy_backend;

core/include/logger.hpp

@@ -6,6 +6,11 @@
 
 namespace logger
 {
+	// Primarily used to disable logging in tests
+	extern bool g_log_enabled;
+#define CHECK_LOGGING_ENABLED() \
+	if(!g_log_enabled) \
+		return;
 	struct fmt_location
 	{
 		const char* fmt;
@@ -23,6 +28,7 @@ namespace logger
 	template <typename... Args>
 	void log(fmt_location format, fmt::color fgcol, Args&&... args)
 	{
+		CHECK_LOGGING_ENABLED();
 		int size_s = std::snprintf(nullptr, 0, format.fmt, std::forward<Args>(args)...);
 		char* buf = new char[size_s + 1];
 		std::snprintf(buf, size_s + 1, format.fmt, std::forward<Args>(args)...);
@@ -34,28 +40,34 @@ namespace logger
 	template <typename... Args>
 	void info(fmt_location format, Args&&... args)
 	{
+		CHECK_LOGGING_ENABLED();
 		fmt::print(fg(fmt::color::blue), "[INFO ] ");
 		log(format, fmt::color::blue, std::forward<Args>(args)...);
 	}
 
 	template <typename... Args>
 	void warn(fmt_location format, Args&&... args)
 	{
+		CHECK_LOGGING_ENABLED();
 		fmt::print(fg(fmt::color::yellow), "[WARN ] ");
 		log(format, fmt::color::yellow, std::forward<Args>(args)...);
 	}
 
 	template <typename... Args>
 	void error(fmt_location format, Args&&... args)
 	{
+		CHECK_LOGGING_ENABLED();
 		fmt::print(fg(fmt::color::red), "[ERROR] ");
 		log(format, fmt::color::red, std::forward<Args>(args)...);
 	}
 
 	template <typename... Args>
 	void debug(fmt_location format, Args&&... args)
 	{
+		CHECK_LOGGING_ENABLED();
 		fmt::print(fg(fmt::color::green), "[DEBUG] ");
 		log(format, fmt::color::green, std::forward<Args>(args)...);
 	}
 }; // namespace logger
+
+#undef CHECK_LOGGING_ENABLED

core/include/machine.hpp

@@ -11,7 +11,7 @@
 
 class Machine
 {
-	Backend* backend = nullptr;
+	Backend* backend = &dummy_backend;
 
 	std::list<GIFBlock> blocks;
 	std::map<std::string, GIFBlock> macros;