# Dependency tracking for D
#
#  Copyright (c) 2010 Jens Mueller <jens.k.mueller@gmx.de>
#
# All rights reserved.
#
# See LICENSE for details.
#

macro(add_executable_with_dependencies _target)
  # extract D source files from arguments
  foreach(file ${ARGV})
    if(${file} MATCHES "\\.d$")
      list(APPEND d_source_files ${file})
    endif()
  endforeach()

  #message("D files in arguments: ${d_source_files}")

  foreach(file IN LISTS d_source_files)
    set(source_file "${CMAKE_CURRENT_SOURCE_DIR}/${file}")
    set(dependency_file "${CMAKE_CURRENT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/${file}-depend.cmake")
    set(dependency_files ${dependency_files} ${dependency_file})

    #message("Checking dependencies for ${source_file}")
    #message("Put into ${dependency_file}")
    # TODO
    # better way to get the included directories
    get_directory_property(include_dirs INCLUDE_DIRECTORIES)
    set(INCLUDES )
    foreach(include_dir IN LISTS include_dirs)
      list(APPEND INCLUDES "${CMAKE_INCLUDE_FLAG_D}${include_dir}")
    endforeach()

    execute_process(
      COMMAND ${CMAKE_COMMAND}
      -D "CMAKE_D_COMPILER:STRING=${CMAKE_D_COMPILER}"
      -D "CMAKE_D_FLAGS:STRING=${CMAKE_D_FLAGS}"
      -D "include_directories:STRING=${INCLUDES}"
      -D "source_file:STRING=${source_file}"
      -D "dependency_file:STRING=${dependency_file}"
      -P "${CMAKE_ROOT}/Modules/dependencies.cmake" # TODO hard coded path
    )

    # load dependencies from file
    include(${dependency_file})
    #message("DEPENDENCIES ${D_DMD_DEPEND}")

    add_custom_command(
      OUTPUT ${dependency_file}
      DEPENDS ${D_DMD_DEPEND}
      COMMAND ${CMAKE_COMMAND}
      -D "CMAKE_D_COMPILER:STRING=${CMAKE_D_COMPILER}"
      -D "CMAKE_D_FLAGS:STRING=${CMAKE_D_FLAGS}"
      -D "include_directories:STRING=${INCLUDES}"
      -D "source_file:STRING=${source_file}"
      -D "dependency_file:STRING=${dependency_file}"
      -P "${CMAKE_ROOT}/Modules/dependencies.cmake" # TODO hard coded path
      COMMENT "Scanning for dependencies")
  endforeach()

  add_executable(${ARGV} ${dependency_files})
endmacro()
