cmake: add a conditional file generation helper

Author: illwieckz

cmake/DaemonBuildInfo.cmake

@@ -1,13 +1,15 @@
-set(DAEMON_BUILDINFO_HEADER "// Automatically generated, do not modify!\n")
-set(DAEMON_BUILDINFO_PARENT "${CMAKE_CURRENT_BINARY_DIR}/GeneratedSource")
+set(DAEMON_GENERATED_DIR "${CMAKE_CURRENT_BINARY_DIR}/GeneratedSource")
+
 set(DAEMON_BUILDINFO_DIR "DaemonBuildInfo")
-set(DAEMON_BUILDINFO_DIR_FULLPATH "${DAEMON_BUILDINFO_PARENT}/${DAEMON_BUILDINFO_DIR}")
+set(DAEMON_BUILDINFO_HEADER "// Automatically generated, do not modify!\n")
 set(DAEMON_BUILDINFO_CPP_EXT ".cpp")
 set(DAEMON_BUILDINFO_H_EXT ".h")
 set(BUILDINFOLIST)
 
-file(MAKE_DIRECTORY "${DAEMON_BUILDINFO_DIR_FULLPATH}")
-include_directories("${DAEMON_BUILDINFO_PARENT}")
+file(MAKE_DIRECTORY "${DAEMON_GENERATED_DIR}")
+include_directories("${DAEMON_GENERATED_DIR}")
+
+file(MAKE_DIRECTORY "${DAEMON_GENERATED_DIR}/${DAEMON_BUILDINFO_DIR}")
 
 foreach(kind CPP H)
 	set(DAEMON_BUILDINFO_${kind} "${DAEMON_BUILDINFO_HEADER}")
@@ -18,20 +20,25 @@ macro(daemon_add_buildinfo TYPE NAME VALUE)
 	set(DAEMON_BUILDINFO_H "${DAEMON_BUILDINFO_H}extern const ${TYPE} ${NAME};\n")
 endmacro()
 
+macro(daemon_write_generated GENERATED_PATH GENERATED_CONTENT)
+	set(DAEMON_GENERATED_FILE ${DAEMON_GENERATED_DIR}/${GENERATED_PATH})
+
+	if (EXISTS "${DAEMON_GENERATED_FILE}")
+		file(READ "${DAEMON_GENERATED_FILE}" GENERATED_CONTENT_READ)
+	endif()
+
+	if (NOT "${GENERATED_CONTENT}" STREQUAL "${GENERATED_CONTENT_READ}")
+		message(STATUS "Generating ${GENERATED_PATH}")
+		file(WRITE "${DAEMON_GENERATED_FILE}" "${GENERATED_CONTENT}")
+	endif()
+endmacro()
+
 macro(daemon_write_buildinfo NAME)
 	foreach(kind CPP H)
 		set(DAEMON_BUILDINFO_${kind}_NAME "${NAME}${DAEMON_BUILDINFO_${kind}_EXT}")
-		set(DAEMON_BUILDINFO_${kind}_FILE "${DAEMON_BUILDINFO_DIR}/${DAEMON_BUILDINFO_${kind}_NAME}")
-		set(DAEMON_BUILDINFO_${kind}_FILE_FULLPATH "${DAEMON_BUILDINFO_PARENT}/${DAEMON_BUILDINFO_${kind}_FILE}")
-		list(APPEND BUILDINFOLIST "${DAEMON_BUILDINFO_${kind}_FILE_FULLPATH}")
-
-		if (EXISTS "${DAEMON_BUILDINFO_${kind}_FILE_FULLPATH}")
-			file(READ "${DAEMON_BUILDINFO_${kind}_FILE_FULLPATH}" DAEMON_BUILDINFO_${kind}_READ)
-		endif()
-
-		if (NOT "${DAEMON_BUILDINFO_${kind}}" STREQUAL "${DAEMON_BUILDINFO_${kind}_READ}")
-			message(STATUS "Generating ${DAEMON_BUILDINFO_${kind}_FILE}")
-			file(WRITE "${DAEMON_BUILDINFO_${kind}_FILE_FULLPATH}" "${DAEMON_BUILDINFO_${kind}}")
-		endif()
+		set(DAEMON_BUILDINFO_${kind}_PATH "${DAEMON_BUILDINFO_DIR}/${DAEMON_BUILDINFO_${kind}_NAME}")
+
+		daemon_write_generated("${DAEMON_BUILDINFO_${kind}_PATH}" "${DAEMON_BUILDINFO_${kind}}")
+		list(APPEND BUILDINFOLIST "${DAEMON_GENERATED_FILE}")
 	endforeach()
 endmacro()