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# encoding: utf-8

"""

Module to handle command line argument parsing, for all front-ends.

"""

from __future__ import print_function, absolute_import

import code

import imp

import os

import sys

from optparse import OptionParser, OptionGroup

from . import __version__

from .config import default_config_path, loadini, Struct

from .translations import _

class OptionParserFailed(ValueError):

"""Raised by the RaisingOptionParser for a bogus commandline."""

class RaisingOptionParser(OptionParser):

def error(self, msg):

raise OptionParserFailed()

def version_banner():

return "bpython version %s on top of Python %s %s" % (

__version__,

sys.version.split()[0],

sys.executable,

)

def parse(args, extras=None, ignore_stdin=False):

"""Receive an argument list - if None, use sys.argv - parse all args and

take appropriate action. Also receive optional extra options: this should

be a tuple of (title, description, options)

title: The title for the option group

description: A full description of the option group

options: A list of optparse.Option objects to be added to the

group

e.g.:

parse(

['-i', '-m', 'foo.py'],

('Front end-specific options',

'A full description of what these options are for',

[optparse.Option('-f', action='store_true', dest='f', help='Explode'),

optparse.Option('-l', action='store_true', dest='l', help='Love')]))

Return a tuple of (config, options, exec_args) wherein "config" is the

config object either parsed from a default/specified config file or default

config options, "options" is the parsed options from

OptionParser.parse_args, and "exec_args" are the args (if any) to be parsed

to the executed file (if any).

"""

if args is None:

args = sys.argv[1:]

parser = RaisingOptionParser(

usage=_(

"Usage: %prog [options] [file [args]]\n"

"NOTE: If bpython sees an argument it does "

"not know, execution falls back to the "

"regular Python interpreter."

)

)

# This is not sufficient if bpython gains its own -m support

# (instead of falling back to Python itself for that).

# That's probably fixable though, for example by having that

# option swallow all remaining arguments in a callback.

parser.disable_interspersed_args()

parser.add_option(

"--config",

default=default_config_path(),

help=_("Use CONFIG instead of default config file."),

)

parser.add_option(

"--interactive",

"-i",

action="store_true",

help=_(

"Drop to bpython shell after running file " "instead of exiting."

),

)

parser.add_option(

"--quiet",

"-q",

action="store_true",

help=_("Don't flush the output to stdout."),

)

parser.add_option(

"--version",

"-V",

action="store_true",

help=_("Print version and exit."),

)

if extras is not None:

extras_group = OptionGroup(parser, extras[0], extras[1])

for option in extras[2]:

extras_group.add_option(option)

parser.add_option_group(extras_group)

try:

options, args = parser.parse_args(args)

except OptionParserFailed:

# Just let Python handle this

os.execv(sys.executable, [sys.executable] + args)

if options.version:

print(version_banner())

print(

"(C) 2008-2016 Bob Farrell, Andreas Stuehrk, Sebastian Ramacher, Thomas Ballinger, et al. "

"See AUTHORS for detail."

)

raise SystemExit

if not ignore_stdin and not (sys.stdin.isatty() and sys.stdout.isatty()):

interpreter = code.InteractiveInterpreter()

interpreter.runsource(sys.stdin.read())

raise SystemExit

config = Struct()

loadini(config, options.config)

return config, options, args

def exec_code(interpreter, args):

"""

Helper to execute code in a given interpreter. args should be a [faked]

sys.argv

"""

with open(args[0], "r") as sourcefile:

source = sourcefile.read()

old_argv, sys.argv = sys.argv, args

sys.path.insert(0, os.path.abspath(os.path.dirname(args[0])))

mod = imp.new_module("__console__")

sys.modules["__console__"] = mod

interpreter.locals = mod.__dict__

interpreter.locals["__file__"] = args[0]

interpreter.runsource(source, args[0], "exec")

sys.argv = old_argv