CMake: grouping sources by directory

function(group_sources root)
  function(__group_sources__ root prefix)
    file(GLOB entries RELATIVE "${root}" "${root}/*")
    foreach(entry ${entries})
      set(abspath "${root}/${entry}")
      if(IS_DIRECTORY "${abspath}")
        __group_sources__("${abspath}" "${prefix}/${entry}")
      else()
        list(APPEND group "${abspath}")
      endif()
    endforeach()
    string(REPLACE "/" "\\" prefix "${prefix}")
    source_group("${prefix}" FILES ${group})
  endfunction()

  get_filename_component(prefix "${root}" NAME)
  __group_sources__("${root}" "${prefix}")
endfunction()

Usage:

group_sources("${CMAKE_SOURCE_DIR}/src")
group_sources("${CMAKE_SOURCE_DIR}/include")

Note this function only creates filters in project, you still need to add source files by ADD_EXECUTABLE or ADD_LIBRARY commands. For more complete example, see this gist.

其實最讓我驚訝的是 CMake 的 FUNCTION 可以巢狀宣告，而且真的有 scope，外面看不到裡面宣告的函式。