File: FindCython.cmake

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#.rst:
# FindCython
# ----------
#
# Find ``cython`` executable.
#
# This module defines the following variables:
#
#  ``CYTHON_EXECUTABLE``
#    path to the ``cython`` program
#
#  ``CYTHON_VERSION``
#    version of ``cython``
#
#  ``CYTHON_FOUND``
#    true if the program was found
#
# See also UseCython.cmake
#
#=============================================================================
# Copyright 2011 Kitware, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#=============================================================================

# Use the Cython executable that lives next to the Python executable
# if it is a local installation.
find_package(PythonInterp)
if(PYTHONINTERP_FOUND)
  get_filename_component(_python_path ${PYTHON_EXECUTABLE} PATH)
  find_program(CYTHON_EXECUTABLE
               NAMES cython cython.bat cython3
               HINTS ${_python_path}
               DOC "path to the cython executable")
else()
  find_program(CYTHON_EXECUTABLE
               NAMES cython cython.bat cython3
               DOC "path to the cython executable")
endif()

if(CYTHON_EXECUTABLE)
  set(CYTHON_version_command ${CYTHON_EXECUTABLE} --version)

  execute_process(COMMAND ${CYTHON_version_command}
                  OUTPUT_VARIABLE CYTHON_version_output
                  ERROR_VARIABLE CYTHON_version_error
                  RESULT_VARIABLE CYTHON_version_result
                  OUTPUT_STRIP_TRAILING_WHITESPACE)

  if(NOT ${CYTHON_version_result} EQUAL 0)
    set(_error_msg "Command \"${CYTHON_version_command}\" failed with")
    set(_error_msg "${_error_msg} output:\n${CYTHON_version_error}")
    message(SEND_ERROR "${_error_msg}")
  else()
    if("${CYTHON_version_output}" MATCHES "^[Cc]ython version ([^,]+)")
      set(CYTHON_VERSION "${CMAKE_MATCH_1}")
    endif()
  endif()
endif()

include(FindPackageHandleStandardArgs)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(Cython REQUIRED_VARS CYTHON_EXECUTABLE)

mark_as_advanced(CYTHON_EXECUTABLE)

include(UseCython)