find_package(Sphinx QUIET)

if(NOT DEFINED SPHINX_THEME)
  set(SPHINX_THEME default)
endif()

if(NOT DEFINED SPHINX_THEME_DIR)
  set(SPHINX_THEME_DIR)
endif()
   
# configured documentation tools and intermediate build results
set(BINARY_BUILD_DIR "${CMAKE_CURRENT_BINARY_DIR}/_build")

# Sphinx cache with pickled ReST documents
set(SPHINX_CACHE_DIR "${CMAKE_CURRENT_BINARY_DIR}/_doctrees")

# HTML output directory
set(SPHINX_HTML_DIR "${CMAKE_CURRENT_BINARY_DIR}/html")

configure_file(
  "${CMAKE_CURRENT_SOURCE_DIR}/conf.py.in"
  "${BINARY_BUILD_DIR}/conf.py"
  @ONLY)

if(SPHINX_FOUND)
  add_custom_target(docs
    ${SPHINX_EXECUTABLE}
    -b html
    -c "${BINARY_BUILD_DIR}"
    -d "${SPHINX_CACHE_DIR}"
    "${CMAKE_CURRENT_SOURCE_DIR}"
    "${SPHINX_HTML_DIR}"
    COMMENT "Building HTML documentation with Sphinx")
else()
  add_custom_target(docs
  echo  "Please install python-sphinx to build the docs or read the docs online: https://projecttox.readthedocs.org/en/latest"
-        COMMENT "No sphinx executable found")
endif()