# doxygen

set (3RDPARTY_DOT_EXECUTABLE_DESCR       "The path to the 'dot' tool producing layered drawings of directed graphs.\nThis tool used by doxygen")
set (3RDPARTY_DOXYGEN_EXECUTABLE_DESCR   "The path to the doxygen command")

if (NOT DEFINED 3RDPARTY_DOXYGEN_EXECUTABLE)
  set (3RDPARTY_DOXYGEN_EXECUTABLE "" CACHE FILEPATH "${3RDPARTY_DOXYGEN_EXECUTABLE_DESCR}")
endif()

if (NOT DEFINED 3RDPARTY_DOT_EXECUTABLE)
  set (3RDPARTY_DOT_EXECUTABLE "" CACHE FILEPATH "${3RDPARTY_DOT_EXECUTABLE_DESCR}")
endif()

if (NOT DEFINED 3RDPARTY_SKIP_DOT_EXECUTABLE)
  set (3RDPARTY_SKIP_DOT_EXECUTABLE OFF CACHE BOOL "Skip trying to find Dot")
endif()

if (3RDPARTY_SKIP_DOT_EXECUTABLE)
  OCCT_CHECK_AND_UNSET (3RDPARTY_DOT_EXECUTABLE)
endif()

if (NOT 3RDPARTY_DOXYGEN_EXECUTABLE OR (NOT 3RDPARTY_SKIP_DOT_EXECUTABLE AND NOT 3RDPARTY_DOT_EXECUTABLE))

  set (DOXYGEN_SKIP_DOT ${3RDPARTY_SKIP_DOT_EXECUTABLE})
  find_package (Doxygen)
  
  if (NOT 3RDPARTY_DOXYGEN_EXECUTABLE AND DOXYGEN_EXECUTABLE)
    set (3RDPARTY_DOXYGEN_EXECUTABLE "${DOXYGEN_EXECUTABLE}" CACHE FILEPATH "${3RDPARTY_DOXYGEN_EXECUTABLE_DESCR}" FORCE)
  endif()
  
  if (NOT 3RDPARTY_SKIP_DOT_EXECUTABLE AND NOT 3RDPARTY_DOT_EXECUTABLE AND DOXYGEN_DOT_EXECUTABLE)
    set (3RDPARTY_DOT_EXECUTABLE "${DOXYGEN_DOT_EXECUTABLE}" CACHE FILEPATH "${3RDPARTY_DOT_EXECUTABLE_DESCR}" FORCE)
  endif()
endif()

if (NOT 3RDPARTY_DOXYGEN_EXECUTABLE OR NOT EXISTS "${3RDPARTY_DOXYGEN_EXECUTABLE}")
  list (APPEND 3RDPARTY_NOT_INCLUDED 3RDPARTY_DOXYGEN_EXECUTABLE)
endif()

if (NOT 3RDPARTY_SKIP_DOT_EXECUTABLE)
  if (NOT 3RDPARTY_DOT_EXECUTABLE OR NOT EXISTS "${3RDPARTY_DOT_EXECUTABLE}")
    list (APPEND 3RDPARTY_NOT_INCLUDED 3RDPARTY_DOT_EXECUTABLE)
  endif()
endif()

# unset all redundant variables
OCCT_CHECK_AND_UNSET (DOXYGEN_SKIP_DOT)
OCCT_CHECK_AND_UNSET (DOXYGEN_EXECUTABLE)
OCCT_CHECK_AND_UNSET (DOXYGEN_DOT_EXECUTABLE)