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# Copyright 2013-2023 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)
import argparse
import code
import os
import platform
import runpy
import sys
import llnl.util.tty as tty
import spack
description = "launch an interpreter as spack would launch a command"
section = "developer"
level = "long"
def setup_parser(subparser):
subparser.add_argument(
"-V",
"--version",
action="store_true",
dest="python_version",
help="print the Python version number and exit",
)
subparser.add_argument("-c", dest="python_command", help="command to execute")
subparser.add_argument(
"-u",
dest="unbuffered",
action="store_true",
help="for compatibility with xdist, do not use without adding -u to the interpreter",
)
subparser.add_argument(
"-i",
dest="python_interpreter",
help="python interpreter",
choices=["python", "ipython"],
default="python",
)
subparser.add_argument(
"-m", dest="module", action="store", help="run library module as a script"
)
subparser.add_argument(
"--path",
action="store_true",
dest="show_path",
help="show path to python interpreter that spack uses",
)
subparser.add_argument(
"python_args", nargs=argparse.REMAINDER, help="file to run plus arguments"
)
def python(parser, args, unknown_args):
if args.python_version:
print("Python", platform.python_version())
return
if args.show_path:
print(sys.executable)
return
if args.module:
sys.argv = ["spack-python"] + unknown_args + args.python_args
runpy.run_module(args.module, run_name="__main__", alter_sys=True)
return
if unknown_args:
tty.die("Unknown arguments:", " ".join(unknown_args))
# Unexpected behavior from supplying both
if args.python_command and args.python_args:
tty.die("You can only specify a command OR script, but not both.")
# Run user choice of interpreter
if args.python_interpreter == "ipython":
return spack.cmd.python.ipython_interpreter(args)
return spack.cmd.python.python_interpreter(args)
def ipython_interpreter(args):
"""An ipython interpreter is intended to be interactive, so it doesn't
support running a script or arguments
"""
try:
import IPython # type: ignore[import]
except ImportError:
tty.die("ipython is not installed, install and try again.")
if "PYTHONSTARTUP" in os.environ:
startup_file = os.environ["PYTHONSTARTUP"]
if os.path.isfile(startup_file):
with open(startup_file) as startup:
exec(startup.read())
# IPython can also support running a script OR command, not both
if args.python_args:
IPython.start_ipython(argv=args.python_args)
elif args.python_command:
IPython.start_ipython(argv=["-c", args.python_command])
else:
header = "Spack version %s\nPython %s, %s %s" % (
spack.spack_version,
platform.python_version(),
platform.system(),
platform.machine(),
)
__name__ = "__main__" # noqa: F841
IPython.embed(module="__main__", header=header)
def python_interpreter(args):
"""A python interpreter is the default interpreter"""
# Fake a main python shell by setting __name__ to __main__.
console = code.InteractiveConsole({"__name__": "__main__", "spack": spack})
if "PYTHONSTARTUP" in os.environ:
startup_file = os.environ["PYTHONSTARTUP"]
if os.path.isfile(startup_file):
with open(startup_file) as startup:
console.runsource(startup.read(), startup_file, "exec")
if args.python_command:
propagate_exceptions_from(console)
console.runsource(args.python_command)
elif args.python_args:
propagate_exceptions_from(console)
sys.argv = args.python_args
with open(args.python_args[0]) as file:
console.runsource(file.read(), args.python_args[0], "exec")
else:
# Provides readline support, allowing user to use arrow keys
console.push("import readline")
# Provide tabcompletion
console.push("from rlcompleter import Completer")
console.push("readline.set_completer(Completer(locals()).complete)")
console.push('readline.parse_and_bind("tab: complete")')
console.interact(
"Spack version %s\nPython %s, %s %s"
% (
spack.spack_version,
platform.python_version(),
platform.system(),
platform.machine(),
)
)
def propagate_exceptions_from(console):
"""Set sys.excepthook to let uncaught exceptions return 1 to the shell.
Args:
console (code.InteractiveConsole): the console that needs a change in sys.excepthook
"""
console.push("import sys")
console.push("_wrapped_hook = sys.excepthook")
console.push("def _hook(exc_type, exc_value, exc_tb):")
console.push(" _wrapped_hook(exc_type, exc_value, exc_tb)")
console.push(" sys.exit(1)")
console.push("")
console.push("sys.excepthook = _hook")
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