#!/bin/sh
# -*- python -*-
#
# Copyright 2013-2021 Lawrence Livermore National Security, LLC and other
# Spack Project Developers. See the top-level COPYRIGHT file for details.
#
# SPDX-License-Identifier: (Apache-2.0 OR MIT)

# This file is bilingual. The following shell code finds our preferred python.
# Following line is a shell no-op, and starts a multi-line Python comment.
# See https://stackoverflow.com/a/47886254
""":"
# prefer SPACK_PYTHON environment variable, python3, python, then python2
for cmd in "${SPACK_PYTHON:-}" python3 python python2; do
    if command -v > /dev/null "$cmd"; then
        export SPACK_PYTHON="$(command -v "$cmd")"
        exec "${SPACK_PYTHON}" "$0" "$@"
    fi
done

echo "==> Error: spack could not find a python interpreter!" >&2
exit 1
":"""
# Line above is a shell no-op, and ends a python multi-line comment.
# The code above runs this file with our preferred python interpreter.

from __future__ import print_function

import os
import sys

min_python3 = (3, 5)

if sys.version_info[:2] < (2, 6) or (
    sys.version_info[:2] >= (3, 0) and sys.version_info[:2] < min_python3
):
    v_info = sys.version_info[:3]
    msg = "Spack requires Python 2.6, 2.7 or %d.%d or higher " % min_python3
    msg += "You are running spack with Python %d.%d.%d." % v_info
    sys.exit(msg)

# Find spack's location and its prefix.
spack_file = os.path.realpath(os.path.expanduser(__file__))
spack_prefix = os.path.dirname(os.path.dirname(spack_file))

# Allow spack libs to be imported in our scripts
spack_lib_path = os.path.join(spack_prefix, "lib", "spack")
sys.path.insert(0, spack_lib_path)

# Add external libs
spack_external_libs = os.path.join(spack_lib_path, "external")

if sys.version_info[:2] <= (2, 7):
    sys.path.insert(0, os.path.join(spack_external_libs, "py2"))
if sys.version_info[:2] == (2, 6):
    sys.path.insert(0, os.path.join(spack_external_libs, "py26"))

sys.path.insert(0, spack_external_libs)

# Here we delete ruamel.yaml in case it has been already imported from site
# (see #9206 for a broader description of the issue).
#
# Briefly: ruamel.yaml produces a .pth file when installed with pip that
# makes the site installed package the preferred one, even though sys.path
# is modified to point to another version of ruamel.yaml.
if "ruamel.yaml" in sys.modules:
    del sys.modules["ruamel.yaml"]

if "ruamel" in sys.modules:
    del sys.modules["ruamel"]

import spack.main  # noqa

# Once we've set up the system path, run the spack main method
if __name__ == "__main__":
    sys.exit(spack.main.main())