find_package(Sphinx REQUIRED)
 
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(
    "${CMAKE_CURRENT_SOURCE_DIR}/conf.py"
    "${BINARY_BUILD_DIR}/conf.py"
    @ONLY)
 
add_custom_target(docs
    ${SPHINX_EXECUTABLE}
    -b html
    -c "${BINARY_BUILD_DIR}"
    "${CMAKE_CURRENT_SOURCE_DIR}"
    "${SPHINX_HTML_DIR}"
    COMMENT "Building HTML documentation with Sphinx")