"""

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

"""

from __future__ import with_statement

import os

import sys

import code

from optparse import OptionParser, OptionGroup

from bpython import __version__

from bpython.config import loadini, Struct, migrate_rc

class OptionParserFailed(ValueError):

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

class RaisingOptionParser(OptionParser):

def error(self, msg):

raise OptionParserFailed()

def parse(args, extras=None):

"""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', '-c', default='~/.bpython/config',

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__,

print 'on top of Python', sys.version.split()[0]

print ('(C) 2008-2010 Bob Farrell, Andreas Stuehrk et al. '

'See AUTHORS for detail.')

raise SystemExit

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

interpreter = code.InteractiveInterpreter()

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

raise SystemExit

path = os.path.expanduser('~/.bpythonrc')

# migrating old configuration file

if os.path.isfile(path):

migrate_rc(path)

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:

code_obj = compile(sourcefile.read(), args[0], 'exec')

old_argv, sys.argv = sys.argv, args

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

interpreter.runcode(code_obj)

sys.argv = old_argv