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

from __future__ import print_function
import code
import imp
import os
import sys
from optparse import OptionParser, OptionGroup

from bpython import __version__
from bpython.config import default_config_path, loadini, Struct
from bpython.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('bpython version', __version__, end=" ")
        print('on top of Python', sys.version.split()[0])
        print('(C) 2008-2015 Bob Farrell, Andreas Stuehrk 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