# Copyright Tomas Zeman 2019-2020.
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt or copy at
# http://www.boost.org/LICENSE_1_0.txt)

function(prefix_clangformat_setup prefix)
    if(NOT CLANGFORMAT_EXECUTABLE)
         set(CLANGFORMAT_EXECUTABLE clang-format)
    endif()

    if(NOT EXISTS ${CLANGFORMAT_EXECUTABLE})
        find_program(clangformat_executable_tmp ${CLANGFORMAT_EXECUTABLE})
        if(clangformat_executable_tmp)
            message("clang-format found--enabling")
            set(CLANGFORMAT_EXECUTABLE ${clangformat_executable_tmp})
            unset(clangformat_executable_tmp)
        else()
            message("clang-format not found")
        endif()
    endif()

    foreach(clangformat_source ${ARGN})
        get_filename_component(clangformat_source ${clangformat_source} ABSOLUTE)
        list(APPEND clangformat_sources ${clangformat_source})
    endforeach()

    add_custom_target(${prefix}_clangformat
            COMMAND
            ${CLANGFORMAT_EXECUTABLE}
            -style=file
            -i
            ${clangformat_sources}
            WORKING_DIRECTORY
            ${CMAKE_SOURCE_DIR}
            COMMENT
            "Formatting ${prefix} with ${CLANGFORMAT_EXECUTABLE} ..."
            )

    if(TARGET clangformat)
        add_dependencies(clangformat ${prefix}_clangformat)
    else()
        add_custom_target(clangformat DEPENDS ${prefix}_clangformat)
    endif()
endfunction()

function(clangformat_setup)
    prefix_clangformat_setup(${PROJECT_NAME} ${ARGN})
endfunction()

function(target_clangformat_setup target)
    get_target_property(target_sources ${target} SOURCES)
    prefix_clangformat_setup(${target} ${target_sources})
endfunction()