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130 lines
3.5 KiB
Python
130 lines
3.5 KiB
Python
# Authors:
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# Jason Gerard DeRose <jderose@redhat.com>
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#
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# Copyright (C) 2008 Red Hat
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# see file 'COPYING' for use and warranty information
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; version 2 only
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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"""
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Functionality for Command Line Inteface.
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"""
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import re
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import sys
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import public
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def to_cli(name):
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"""
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Takes a Python identifier and transforms it into form suitable for the
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Command Line Interface.
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"""
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assert isinstance(name, str)
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return name.replace('_', '-')
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def from_cli(cli_name):
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"""
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Takes a string from the Command Line Interface and transforms it into a
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Python identifier.
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"""
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assert isinstance(cli_name, basestring)
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return cli_name.replace('-', '_')
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class help(public.cmd):
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'display help on command'
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def __call__(self, key):
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if from_cli(key) not in self.api.cmd:
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print 'help: no such command %r' % key
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sys.exit(2)
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print 'Help on command %r:' % key
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class CLI(object):
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__d = None
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__mcl = None
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def __init__(self, api):
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self.__api = api
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def __get_api(self):
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return self.__api
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api = property(__get_api)
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def print_commands(self):
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print 'Available Commands:'
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for cmd in self.api.cmd:
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print ' %s %s' % (
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to_cli(cmd.name).ljust(self.mcl),
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cmd.doc,
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)
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def __contains__(self, key):
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assert self.__d is not None, 'you must call finalize() first'
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return key in self.__d
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def __getitem__(self, key):
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assert self.__d is not None, 'you must call finalize() first'
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return self.__d[key]
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def finalize(self):
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api = self.api
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api.register(help)
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api.finalize()
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def d_iter():
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for cmd in api.cmd:
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yield (to_cli(cmd.name), cmd)
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self.__d = dict(d_iter())
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def run(self):
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self.finalize()
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if len(sys.argv) < 2:
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self.print_commands()
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print 'Usage: ipa COMMAND [OPTIONS]'
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sys.exit(2)
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cmd = sys.argv[1]
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if cmd not in self:
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self.print_commands()
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print 'ipa: ERROR: unknown command %r' % cmd
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sys.exit(2)
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self.run_cmd(cmd, sys.argv[2:])
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def run_cmd(self, cmd, given):
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(args, kw) = self.parse(given)
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self[cmd](*args, **kw)
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def parse(self, given):
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args = []
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kw = {}
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for g in given:
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m = re.match(r'^--([a-z][-a-z0-9]*)=(.+)$', g)
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if m:
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kw[from_cli(m.group(1))] = m.group(2)
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else:
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args.append(g)
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return (args, kw)
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def __get_mcl(self):
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"""
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Returns the Max Command Length.
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"""
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if self.__mcl is None:
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if self.__d is None:
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return None
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self.__mcl = max(len(k) for k in self.__d)
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return self.__mcl
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mcl = property(__get_mcl)
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