#!/usr/bin/env python
# Gentoo 'py.test' wrapper script

import os
import re
import subprocess
import sys

EPYTHON_re = re.compile(r"^python(\d+\.\d+)$")

EPYTHON = os.environ.get("EPYTHON")
if EPYTHON:
	EPYTHON_matched = EPYTHON_re.match(EPYTHON)
	if EPYTHON_matched:
		PYTHON_ABI = EPYTHON_matched.group(1)
	else:
		sys.stderr.write("EPYTHON variable has unrecognized value '%s'\n" % EPYTHON)
		sys.exit(1)
else:
	try:
		eselect_process = subprocess.Popen(["/usr/bin/eselect", "python", "show"], stdout=subprocess.PIPE)
		if eselect_process.wait() != 0:
			raise ValueError
	except (OSError, ValueError):
		sys.stderr.write("Execution of 'eselect python show' failed\n")
		sys.exit(1)

	eselect_output = eselect_process.stdout.read()
	if not isinstance(eselect_output, str):
		# Python 3
		eselect_output = eselect_output.decode()

	EPYTHON_matched = EPYTHON_re.match(eselect_output)
	if EPYTHON_matched:
		PYTHON_ABI = EPYTHON_matched.group(1)
	else:
		sys.stderr.write("'eselect python show' printed unrecognized value '%s" % eselect_output)
		sys.exit(1)

target_executable = "%s-%s" % (sys.argv[0], PYTHON_ABI)
if not os.path.exists(target_executable):
	sys.stderr.write("'%s' does not exist\n" % target_executable)
	sys.exit(1)

os.execv(target_executable, sys.argv)