## ------------------------                                 -*- Autoconf -*-

## Python file handling

## From Andrew Dalke

## Updated by James Henstridge

## Updated by Werner Koch 2018-10-17

## ---------------------------------

# Copyright (C) 1999-2017 Free Software Foundation, Inc.

#

# This file is free software; the Free Software Foundation

# gives unlimited permission to copy and/or distribute it,

# with or without modifications, as long as this notice is preserved.

# AM_PATH_PYTHON([MINIMUM-VERSION], [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]

#                [INTERPRETER-LIST])

# ---------------------------------------------------------------------------

# Adds support for distributing Python modules and packages.  To

# install modules, copy them to $(pythondir), using the python_PYTHON

# automake variable.  To install a package with the same name as the

# automake package, install to $(pkgpythondir), or use the

# pkgpython_PYTHON automake variable.

#

# The variables $(pyexecdir) and $(pkgpyexecdir) are provided as

# locations to install python extension modules (shared libraries).

# Another macro is required to find the appropriate flags to compile

# extension modules.

#

# If your package is configured with a different prefix to python,

# users will have to add the install directory to the PYTHONPATH

# environment variable, or create a .pth file (see the python

# documentation for details).

#

# If the MINIMUM-VERSION argument is passed, AM_PATH_PYTHON will

# cause an error if the version of python installed on the system

# doesn't meet the requirement.  MINIMUM-VERSION should consist of

# numbers and dots only.

AC_DEFUN([AM_PATH_PYTHON],

 [

  dnl Find a Python interpreter.  Python versions prior to 2.0 are not

  dnl supported. (2.0 was released on October 16, 2000).  Python 3.0

  dnl through to Python 3.3 are also not supported.

  m4_define_default([_AM_PYTHON_INTERPRETER_LIST],

[python2 python2.7 dnl

 python dnl

 python3 python3.7 python3.6 python3.5 python3.4 dnl python3.8

 ])

  AC_ARG_VAR([PYTHON], [the Python interpreter])

  m4_if([$1],[],[

    dnl No version check is needed.

    # Find any Python interpreter.

    if test -z "$PYTHON"; then

      AC_PATH_PROGS([PYTHON], _AM_PYTHON_INTERPRETER_LIST, :)

    fi

    am_display_PYTHON=python

  ], [

    dnl A version check is needed.

    if test -n "$PYTHON"; then

      # If the user set $PYTHON, use it and don't search something else.

      AC_MSG_CHECKING([whether $PYTHON version is >= $1])

      AM_PYTHON_CHECK_VERSION([$PYTHON], [$1],

			      [AC_MSG_RESULT([yes])],

			      [AC_MSG_RESULT([no])

			       AC_MSG_ERROR([Python interpreter is too old])])

      am_display_PYTHON=$PYTHON

    else

      # Otherwise, try each interpreter until we find one that satisfies

      # VERSION.

      AC_CACHE_CHECK([for a Python interpreter with version >= $1],

	[am_cv_pathless_PYTHON],[

	for am_cv_pathless_PYTHON dnl

          in m4_if([$4],[],[_AM_PYTHON_INTERPRETER_LIST],[$4]) none; do

	  test "$am_cv_pathless_PYTHON" = none && break

	  AM_PYTHON_CHECK_VERSION([$am_cv_pathless_PYTHON], [$1], [break])

	done])

      # Set $PYTHON to the absolute path of $am_cv_pathless_PYTHON.

      if test "$am_cv_pathless_PYTHON" = none; then

	PYTHON=:

      else

        AC_PATH_PROG([PYTHON], [$am_cv_pathless_PYTHON])

      fi

      am_display_PYTHON=$am_cv_pathless_PYTHON

    fi

  ])

  if test "$PYTHON" = :; then

  dnl Run any user-specified action, or abort.

    m4_default([$3], [AC_MSG_ERROR([no suitable Python interpreter found])])

  else

  dnl Query Python for its version number.  Getting [:3] seems to be

  dnl the best way to do this; it's what "site.py" does in the standard

  dnl library.

  AC_CACHE_CHECK([for $am_display_PYTHON version], [am_cv_python_version],

    [am_cv_python_version=`$PYTHON -c "import sys; sys.stdout.write(sys.version[[:3]])"`])

  AC_SUBST([PYTHON_VERSION], [$am_cv_python_version])

  dnl Use the values of $prefix and $exec_prefix for the corresponding

  dnl values of PYTHON_PREFIX and PYTHON_EXEC_PREFIX.  These are made

  dnl distinct variables so they can be overridden if need be.  However,

  dnl general consensus is that you shouldn't need this ability.

  AC_SUBST([PYTHON_PREFIX], ['${prefix}'])

  AC_SUBST([PYTHON_EXEC_PREFIX], ['${exec_prefix}'])

  dnl At times (like when building shared libraries) you may want

  dnl to know which OS platform Python thinks this is.

  AC_CACHE_CHECK([for $am_display_PYTHON platform], [am_cv_python_platform],

    [am_cv_python_platform=`$PYTHON -c "import sys; sys.stdout.write(sys.platform)"`])

  AC_SUBST([PYTHON_PLATFORM], [$am_cv_python_platform])

  # Just factor out some code duplication.

  am_python_setup_sysconfig="\

import sys

# Prefer sysconfig over distutils.sysconfig, for better compatibility

# with python 3.x.  See automake bug#10227.

try:

    import sysconfig

except ImportError:

    can_use_sysconfig = 0

else:

    can_use_sysconfig = 1

# Can't use sysconfig in CPython 2.7, since it's broken in virtualenvs:

# <https://github.com/pypa/virtualenv/issues/118>

try:

    from platform import python_implementation

    if python_implementation() == 'CPython' and sys.version[[:3]] == '2.7':

        can_use_sysconfig = 0

except ImportError:

    pass"

  dnl Set up 4 directories:

  dnl pythondir -- where to install python scripts.  This is the

  dnl   site-packages directory, not the python standard library

  dnl   directory like in previous automake betas.  This behavior

  dnl   is more consistent with lispdir.m4 for example.

  dnl Query distutils for this directory.

  AC_CACHE_CHECK([for $am_display_PYTHON script directory],

    [am_cv_python_pythondir],

    [if test "x$prefix" = xNONE

     then

       am_py_prefix=$ac_default_prefix

     else

       am_py_prefix=$prefix

     fi

     am_cv_python_pythondir=`$PYTHON -c "

$am_python_setup_sysconfig

if can_use_sysconfig:

    sitedir = sysconfig.get_path('purelib', vars={'base':'$am_py_prefix'})

else:

    from distutils import sysconfig

    sitedir = sysconfig.get_python_lib(0, 0, prefix='$am_py_prefix')

sys.stdout.write(sitedir)"`

     case $am_cv_python_pythondir in

     $am_py_prefix*)

       am__strip_prefix=`echo "$am_py_prefix" | sed 's|.|.|g'`

       am_cv_python_pythondir=`echo "$am_cv_python_pythondir" | sed "s,^$am__strip_prefix,$PYTHON_PREFIX,"`

       ;;

     *)

       case $am_py_prefix in

         /usr|/System*) ;;

         *)

	  am_cv_python_pythondir=$PYTHON_PREFIX/lib/python$PYTHON_VERSION/site-packages

	  ;;

       esac

       ;;

     esac

    ])

  AC_SUBST([pythondir], [$am_cv_python_pythondir])

  dnl pkgpythondir -- $PACKAGE directory under pythondir.  Was

  dnl   PYTHON_SITE_PACKAGE in previous betas, but this naming is

  dnl   more consistent with the rest of automake.

  AC_SUBST([pkgpythondir], [\${pythondir}/$PACKAGE])

  dnl pyexecdir -- directory for installing python extension modules

  dnl   (shared libraries)

  dnl Query distutils for this directory.

  AC_CACHE_CHECK([for $am_display_PYTHON extension module directory],

    [am_cv_python_pyexecdir],

    [if test "x$exec_prefix" = xNONE

     then

       am_py_exec_prefix=$am_py_prefix

     else

       am_py_exec_prefix=$exec_prefix

     fi

     am_cv_python_pyexecdir=`$PYTHON -c "

$am_python_setup_sysconfig

if can_use_sysconfig:

    sitedir = sysconfig.get_path('platlib', vars={'platbase':'$am_py_prefix'})

else:

    from distutils import sysconfig

    sitedir = sysconfig.get_python_lib(1, 0, prefix='$am_py_prefix')

sys.stdout.write(sitedir)"`

     case $am_cv_python_pyexecdir in

     $am_py_exec_prefix*)

       am__strip_prefix=`echo "$am_py_exec_prefix" | sed 's|.|.|g'`

       am_cv_python_pyexecdir=`echo "$am_cv_python_pyexecdir" | sed "s,^$am__strip_prefix,$PYTHON_EXEC_PREFIX,"`

       ;;

     *)

       case $am_py_exec_prefix in

         /usr|/System*) ;;

         *)

	   am_cv_python_pyexecdir=$PYTHON_EXEC_PREFIX/lib/python$PYTHON_VERSION/site-packages

	   ;;

       esac

       ;;

     esac

    ])

  AC_SUBST([pyexecdir], [$am_cv_python_pyexecdir])

  dnl pkgpyexecdir -- $(pyexecdir)/$(PACKAGE)

  AC_SUBST([pkgpyexecdir], [\${pyexecdir}/$PACKAGE])

  dnl Run any user-specified action.

  $2

  fi

])

# AM_PYTHON_CHECK_VERSION(PROG, VERSION, [ACTION-IF-TRUE], [ACTION-IF-FALSE])

# ---------------------------------------------------------------------------

# Run ACTION-IF-TRUE if the Python interpreter PROG has version >= VERSION.

# Run ACTION-IF-FALSE otherwise.

# This test uses sys.hexversion instead of the string equivalent (first

# word of sys.version), in order to cope with versions such as 2.2c1.

# This supports Python 2.0 or higher. (2.0 was released on October 16, 2000).

AC_DEFUN([AM_PYTHON_CHECK_VERSION],

 [prog="import sys

# split strings by '.' and convert to numeric.  Append some zeros

# because we need at least 4 digits for the hex conversion.

# map returns an iterator in Python 3.0 and a list in 2.x

minver = list(map(int, '$2'.split('.'))) + [[0, 0, 0]]

minverhex = 0

# xrange is not present in Python 3.0 and range returns an iterator

for i in list(range(0, 4)): minverhex = (minverhex << 8) + minver[[i]]

sys.exit(sys.hexversion < minverhex)"

  AS_IF([AM_RUN_LOG([$1 -c "$prog"])], [$3], [$4])])