Build docs with cmake

CMakeLists.txt

@@ -6,20 +6,22 @@ set(CMAKE_C_STANDARD 99)
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
+# Protobuf
 find_package(Protobuf REQUIRED)
 include_directories(${Protobuf_INCLUDE_DIRS})
 include_directories(${CMAKE_CURRENT_BINARY_DIR})
 protobuf_generate_cpp(PROTO_SRCS PROTO_HDRS ${TARGET_NAME}.proto)
 
+# Botan2 via PkgConfig
 find_package(PkgConfig)
 pkg_check_modules(BOTAN2 REQUIRED botan-2)
 
+# LevelDB
 find_path(
 	LEVELDB_INCLUDE_DIR
 	NAMES leveldb/db.h
 	DOC "leveldb include dir"
 )
-
 find_library(
 	LEVELDB_LIBRARY
 	NAMES leveldb
@@ -28,24 +30,57 @@ find_library(
 set(LEVELDB_INCLUDE_DIRS ${LEVELDB_INCLUDE_DIR})
 set(LEVELDB_LIBRARIES ${LEVELDB_LIBRARY})
 
-find_package(Doxygen REQUIRED doxygen dot)
-
+# Threads
 find_package(Threads REQUIRED)
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pthread")
 
+# CXXOPTS
 add_subdirectory(extern/cxxopts)
+
+# Common Sources for both executables
 set(COMMON_SRCS
 	src/game.cpp
 	${PROTO_SRCS}
 	${PROTO_HDRS}
 )
 
+set(COMMON_LIBS
+	${Protobuf_LIBRARIES}
+	${BOTAN2_LIBRARIES}
+	${BOTAN2_LDFLAGS}
+	cxxopts
+)
+
+# Docs
+option(BUILD_DOC "Build documentation" ON)
+
+# check if Doxygen is installed
+find_package(Doxygen)
+
+if(DOXYGEN_FOUND)
+	# set input and output files
+	set(DOXYGEN_FILE ${CMAKE_CURRENT_SOURCE_DIR}/Doxyfile)
+	message("Doxygen build started")
+
+	# note the option ALL which allows to build the docs together with the application
+	add_custom_target(doc_doxygen ALL
+		COMMAND ${DOXYGEN_EXECUTABLE} ${DOXYGEN_FILE}
+		WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+		COMMENT "Generating API documentation with Doxygen"
+		VERBATIM)
+else(DOXYGEN_FOUND)
+	message("Doxygen need to be installed to generate the doxygen documentation")
+endif(DOXYGEN_FOUND)
+
+# Server
 set(server_sources src/server_main.cpp src/server.cpp ${COMMON_SRCS})
 add_executable(${TARGET_NAME}_server ${server_sources})
-target_link_libraries(${TARGET_NAME}_server ${Protobuf_LIBRARIES})
-target_link_libraries(${TARGET_NAME}_server ${BOTAN2_LIBRARIES} ${BOTAN2_LDFLAGS})
+target_link_libraries(${TARGET_NAME}_server ${COMMON_LIBS})
+
+# target_link_libraries(${TARGET_NAME}_server ${Protobuf_LIBRARIES})
+# target_link_libraries(${TARGET_NAME}_server ${BOTAN2_LIBRARIES} ${BOTAN2_LDFLAGS})
+# target_link_libraries(${TARGET_NAME}_server cxxopts)
 target_link_libraries(${TARGET_NAME}_server ${LEVELDB_LIBRARIES})
-target_link_libraries(${TARGET_NAME}_server cxxopts)
 target_include_directories(
 	${TARGET_NAME}_server PRIVATE
 	${CMAKE_SOURCE_DIR}/src
@@ -54,11 +89,15 @@ target_include_directories(
 	${LEVELDB_INCLUDE_DIRS}
 	cxxopts
 )
+
+# Client
 set(client_sources src/client_main.cpp src/client.cpp ${COMMON_SRCS})
 add_executable(${TARGET_NAME}_client ${client_sources})
-target_link_libraries(${TARGET_NAME}_client ${Protobuf_LIBRARIES})
-target_link_libraries(${TARGET_NAME}_client ${BOTAN2_LIBRARIES} ${BOTAN2_LDFLAGS})
-target_link_libraries(${TARGET_NAME}_client cxxopts)
+target_link_libraries(${TARGET_NAME}_client ${COMMON_LIBS})
+
+# target_link_libraries(${TARGET_NAME}_client ${Protobuf_LIBRARIES})
+# target_link_libraries(${TARGET_NAME}_client ${BOTAN2_LIBRARIES} ${BOTAN2_LDFLAGS})
+# target_link_libraries(${TARGET_NAME}_client cxxopts)
 target_include_directories(
 	${TARGET_NAME}_client PRIVATE
 	${CMAKE_SOURCE_DIR}/src