# get all project files

file(GLOB_RECURSE ALL_SOURCE_FILES *.cpp *.c *.h *.m *.java)

# minimum version required

set(_CLANG_FORMAT_MINIMUM_VERSION 7.0.0)

find_program(CLANG_FORMAT

	NAMES

	clang-format-8

	clang-format-7

	clang-format

	)

if (NOT CLANG_FORMAT)

	message(WARNING "clang-format not found in path! code format target not available.")

else()

	execute_process(

		COMMAND ${CLANG_FORMAT} "--version"

		OUTPUT_VARIABLE _CLANG_FORMAT_VERSION

		RESULT_VARIABLE _CLANG_FORMAT_VERSION_FAILED

		)

	if (_CLANG_FORMAT_VERSION_FAILED)

		message(WARNING "A problem was encounterd with ${CLANG_FORMAT}")

		return()

	endif()

	string(REGEX MATCH "([7-9]|[1-9][0-9])\\.[0-9]\\.[0-9]" CLANG_FORMAT_VERSION

		"${_CLANG_FORMAT_VERSION}")

	if (NOT CLANG_FORMAT_VERSION)

		message(WARNING "problem parsing clang-fromat version for ${CLANG_FORMAT}")

		return()

	endif()

	if (${CLANG_FORMAT_VERSION} VERSION_LESS ${_CLANG_FORMAT_MINIMUM_VERSION})

		message(WARNING "clang-format version ${CLANG_FORMAT_VERSION} not supported")

		message(WARNING "Minimum version required: ${_CLANG_FORMAT_MINIMUM_VERSION}")

		return()

	endif()

	add_custom_target(

			clangformat

			COMMAND ${CLANG_FORMAT}

			-style=file

			-i

			${ALL_SOURCE_FILES}

			)

endif()