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# Authors:
# Jason Gerard DeRose <jderose@redhat.com>
#
# Copyright (C) 2008 Red Hat
# see file 'COPYING' for use and warranty information
#
# 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; version 2 only
#
# 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.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""
Functionality for Command Line Inteface.
"""
import re
import sys
import public
def to_cli(name):
"""
Takes a Python identifier and transforms it into form suitable for the
Command Line Interface.
"""
assert isinstance(name, str)
return name.replace('_', '-')
def from_cli(cli_name):
"""
Takes a string from the Command Line Interface and transforms it into a
Python identifier.
"""
assert isinstance(cli_name, basestring)
return cli_name.replace('-', '_')
class help(public.cmd):
'display help on command'
class CLI(object):
__d = None
__mcl = None
def __init__(self, api):
self.__api = api
def __get_api(self):
return self.__api
api = property(__get_api)
def print_commands(self):
print 'Available Commands:'
for cmd in self.api.cmd:
print ' %s %s' % (
to_cli(cmd.name).ljust(self.mcl),
cmd.doc,
)
def __contains__(self, key):
assert self.__d is not None, 'you must call finalize() first'
return key in self.__d
def __getitem__(self, key):
assert self.__d is not None, 'you must call finalize() first'
return self.__d[key]
def finalize(self):
api = self.api
api.register(help)
api.finalize()
def d_iter():
for cmd in api.cmd:
yield (to_cli(cmd.name), cmd)
self.__d = dict(d_iter())
def run(self):
self.finalize()
if len(sys.argv) < 2:
self.print_commands()
print 'Usage: ipa COMMAND [OPTIONS]'
sys.exit(2)
cmd = sys.argv[1]
if cmd not in self:
self.print_commands()
print 'ipa: ERROR: unknown command %r' % cmd
sys.exit(2)
self.run_cmd(cmd, sys.argv[2:])
def run_cmd(self, cmd, given):
print self.parse(given)
sys.exit(0)
kw = dict(self.parse_kw(args))
self[cmd](**kw)
def parse_kw(self, args):
for arg in args:
m = re.match(r'^--([a-z][-a-z0-9]*)=(.+)$', arg)
if m is not None:
yield (
from_cli(m.group(1)),
m.group(2),
)
def parse(self, given):
args = []
kw = {}
for g in given:
m = re.match(r'^--([a-z][-a-z0-9]*)=(.+)$', g)
if m:
kw[from_cli(m.group(1))] = m.group(2)
else:
args.append(g)
return (args, kw)
def __get_mcl(self):
"""
Returns the Max Command Length.
"""
if self.__mcl is None:
if self.__d is None:
return None
self.__mcl = max(len(k) for k in self.__d)
return self.__mcl
mcl = property(__get_mcl)
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