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# Some argument parsing functions.
#
# Copyright (C) 2015-2016 Andrew Cagney <cagney@gnu.org>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version. See <https://www.gnu.org/licenses/gpl2.txt>.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
import sys
import os
from fab import tee
class MetaList(type):
def __new__(cls, name, bases, namespace, **kwds):
result = type.__new__(cls, name, bases, namespace, **kwds)
# The string names are mapped onto the canonical member names
# so that that the construct:
#
# for p in List(List.member): p is List.member"
#
# works.
members = {}
for name, value in namespace.items():
# good enough for now
if name.startswith("__"):
continue
if not isinstance(value, str):
continue
members[value] = value
result._members_ = members
result._metavar_ = "{" + ",".join(sorted(members)) + "},..."
return result
def __str__(cls):
return cls._metavar_
class List(metaclass=MetaList):
def __init__(self, *args):
self.args = []
for arg in args:
for member in arg.split(","):
if not member:
# ignore ''
continue
if member in self._members_:
# Form the list using the member values, not some
# equivalent string. Ignore ''.
self.args.append(self._members_[member])
else:
raise ValueError()
def __iter__(self):
return self.args.__iter__()
def __str__(self):
return ",".join(self.args)
def __contains__(self, member):
return member in self.args
def __bool__(self):
return bool(self.args)
def boolean(arg):
a = arg.lower()
for t in [ "1", "yes", "true", "enable" ]:
if t.startswith(a):
return True
for f in [ "0", "no", "false", "disable" ]:
if f.startswith(a):
return False
raise Exception("Unrecognized boolean argument '%s'" % arg)
def timeout(arg):
arg = arg.lower()
if arg == "none" or arg == "infinite":
return None
v = float(arg)
if v < 0:
return None
else:
return v
def directory(arg):
if os.path.isdir(arg):
return arg
raise Exception("directory '%s' not found" % arg)
def directory_file(arg):
d,b = os.path.split(arg)
if os.path.isdir(d):
return arg
raise Exception("directory '%d' for file '%s' not found" % (d, b))
def add_redirect_argument(parser, what, *args, **kwargs):
# Can't use '-FILE' as the argument as the parser doesn't like it.
# The prefix syntax is hacky.
parser.add_argument(*args, type=stdout_or_open_file,
help=(what +
"; '-' is an alias for /dev/stdout"
"; '+%(metavar)s': append to %(metavar)s"
"; '=%(metavar)s': overwrite %(metavar)s (default behaviour)"
"; '++%(metavar)s': copy to stdout, append to %(metavar)s"
"; '+=%(metavar)s': copy to stdout, overwrite %(metavar)s"),
**kwargs)
def stdout_or_open_file(arg):
if arg == "-":
return sys.stdout.buffer
elif arg.startswith("++"):
return tee.open(sys.stdout, files=[open(arg[2:], "a")])
elif arg.startswith("+="):
return tee.open(sys.stdout, files=[open(arg[2:], "w")])
elif arg.startswith("+"):
return open(arg[1:], "a")
elif arg.startswith("="):
return open(arg[1:], "w")
else:
return open(arg, "w")
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