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"""
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 default_config_path, loadini, Struct
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, 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__,
print 'on top of Python', sys.version.split()[0]
print ('(C) 2008-2011 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:
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