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find_program(SPHINX_EXECUTABLE NAMES sphinx-build sphinx-build2
    HINTS
    $ENV{SPHINX_DIR}
    PATH_SUFFIXES bin
    DOC "Sphinx documentation generator"
)
mark_as_advanced(SPHINX_EXECUTABLE)

# Detect Sphinx version
if (SPHINX_EXECUTABLE AND NOT DEFINED SPHINX_EXECUTABLE_VERSION)
    execute_process(
        COMMAND ${SPHINX_EXECUTABLE} --version
        ERROR_VARIABLE  SPHINX_VERSION_OUTPUT_VARIABLE
        OUTPUT_VARIABLE SPHINX_VERSION_OUTPUT_VARIABLE
        RESULT_VARIABLE SPHINX_VERSION_RESULT_VARIABLE
        ERROR_QUIET
        OUTPUT_STRIP_TRAILING_WHITESPACE
        )

    # Detect the sphinx version. First try to match the error message
    # from old versions that didn't even support --version, then try
    # to detect more modern sphinx versions. If nothing is found, then
    # the cache variable is set to an empty value.
    set(_version "")
    if(SPHINX_VERSION_OUTPUT_VARIABLE MATCHES "Sphinx v([0-9\.]+)\n.*")
        set(_version ${CMAKE_MATCH_1})
    elseif (SPHINX_VERSION_OUTPUT_VARIABLE MATCHES ".*build[ )]*(.*)")
        set(_version ${CMAKE_MATCH_1})
    endif()

    set(SPHINX_EXECUTABLE_VERSION ${_version} CACHE INTERNAL "Version of ${SPHINX_EXECUTABLE}")
endif()

set(_find_deps_options)
if (Sphinx_FIND_QUIETLY)
    set(_find_deps_options QUIET)
endif()
include(FindPythonModule)
find_python_module(pygments ${_find_deps_options})
if (PYTHONMODULE_PYGMENTS)
    set(Sphinx_pygments_FOUND 1)
endif()

include(FindPackageHandleStandardArgs)

find_package_handle_standard_args(Sphinx
    REQUIRED_VARS SPHINX_EXECUTABLE
    VERSION_VAR SPHINX_EXECUTABLE_VERSION
    HANDLE_COMPONENTS
    )