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#!/usr/bin/env python
# $Id: get-python-defs,v 1.1.1.1 2003/02/08 00:42:18 dairiki Exp $
#
# Copyright (C) 2003 Geoffrey T. Dairiki <dairiki@dairiki.org>
#
# This file is part of Pyxine, Python bindings for xine.
#
# Pyxine is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# Pyxine is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
"""Find the path to the python executable (version 2 or better).
Usage:
python-config [options] [<variable name> [...]]
Options:
--alternate-python-names=<alternates>
A comma separted list of alternate names under which
Python 2.x interpreters might be found.
(Default is 'python2'.)
If no variable names are listed on the command line, all defined
variables are extracted.
"""
import sys, os, getopt, string
class Main:
# Alternate names under which to find python interpreters.
# (Default value, may be changed in parse_args().)
alternates = ['python2']
# Config variables to extract.
# (Default value, may be changed in parse_args().)
requested_vars = []
def __init__(self):
self.parse_args()
self.ensure_compatible_python()
config = self.get_config()
vars = self.requested_vars or config.keys()
vars.sort()
for name in vars:
print "%-14s = %s" % (name, config[name])
def parse_args(self):
"""Parse command-line args.
"""
opts, vars = getopt.getopt(sys.argv[1:], '',
['alternate-python-names='])
alternates = []
for opt, val in opts:
if opt == '--alternate-python-names':
alternates.extend(string.split(val, ','))
if alternates:
self.alternates = alternates
if vars:
self.requested_vars = vars
def check_python_version(self):
"""Raise exception if we're not running under python 2.x
"""
if sys.version_info[0] < 2:
raise Exception, 'Bad python version'
def ensure_compatible_python(self):
try:
self.check_python_version()
except Exception:
alternates = self.alternates
while alternates:
# doesn't return upon success
self.try_exec_self(alternates.pop(0))
print "Can't find python (version 2.x)"
sys.exit(1)
def try_exec_self(self, python):
"""Try running ourself using an alternate python.
"""
args = [python, sys.argv[0]]
args.extend(['--alternate-python-names',
string.join(self.alternates, ',')])
args.extend(self.requested_vars)
try:
os.execvp(python, args)
except OSError:
pass
def get_config(self):
from distutils.sysconfig import get_config_vars
config = get_config_vars()
config['PYTHON'] = sys.executable
return config
Main()
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