# Copyright
import codecs
import optparse
import sys
import libbe
import libbe.ui.util.user
import libbe.util.encoding
import libbe.util.plugin
class UserError(Exception):
pass
class UnknownCommand(UserError):
def __init__(self, cmd):
Exception.__init__(self, "Unknown command '%s'" % cmd)
self.cmd = cmd
def get_command(command_name):
"""Retrieves the module for a user command
>>> try:
... get_command('asdf')
... except UnknownCommand, e:
... print e
Unknown command 'asdf'
>>> repr(get_command('list')).startswith("<module 'libbe.command.list' from ")
True
"""
try:
cmd = libbe.util.plugin.import_by_name(
'libbe.command.%s' % command_name.replace("-", "_"))
except ImportError, e:
raise UnknownCommand(command_name)
return cmd
def commands():
for modname in libbe.util.plugin.modnames('libbe.command'):
if modname not in ['base', 'util']:
yield modname
class CommandInput (object):
def __init__(self, name, help=''):
self.name = name
self.help = help
class Argument (CommandInput):
def __init__(self, metavar=None, default=None, type='string',
optional=False, repeatable=False,
completion_callback=None, *args, **kwargs):
CommandInput.__init__(self, *args, **kwargs)
self.metavar = metavar
self.default = default
self.type = type
self.optional = optional
self.repeatable = repeatable
self.completion_callback = completion_callback
if self.metavar == None:
self.metavar = self.name.upper()
class Option (CommandInput):
def __init__(self, callback=None, short_name=None, arg=None,
*args, **kwargs):
CommandInput.__init__(self, *args, **kwargs)
self.callback = callback
self.short_name = short_name
self.arg = arg
if self.arg == None and self.callback == None:
# use an implicit boolean argument
self.arg = Argument(name=self.name, help=self.help,
default=False, type='bool')
self.validate()
def validate(self):
if self.arg == None:
assert self.callback != None
return
assert self.callback == None, self.callback
assert self.arg.name == self.name, \
'Name missmatch: %s != %s' % (self.arg.name, self.name)
assert self.arg.optional == False
assert self.arg.repeatable == False
def __str__(self):
return '--%s' % self.name
def __repr__(self):
return '<Option %s>' % self.__str__()
class _DummyParser (object):
def __init__(self, options):
self.option_list = options
self.option_groups = []
for option in self.option_list: # add required methods and attributes
option.dest = option.name
option._short_opts = []
if option.short_name != None:
option._short_opts.append('-' + option.short_name)
option._long_opts = ['--' + option.name]
option.takes_value = lambda : option.arg != None
if option.takes_value():
option.metavar = option.arg.metavar
else:
option.metavar = None
class OptionFormatter (optparse.IndentedHelpFormatter):
def __init__(self, options):
optparse.IndentedHelpFormatter.__init__(self)
self.options = options
def option_help(self):
# based on optparse.OptionParser.format_option_help()
parser = _DummyParser(self.options)
self.store_option_strings(parser)
ret = []
ret.append(self.format_heading('Options'))
self.indent()
for option in self.options:
ret.append(self.format_option(option))
ret.append('\n')
self.dedent()
# Drop the last '\n', or the header if no options or option groups:
return ''.join(ret[:-1])
class Command (object):
"""One-line command description.
>>> c = Command()
>>> print c.help()
usage: be command [options]
<BLANKLINE>
Options:
-h HELP, --help=HELP Print a help message.
<BLANKLINE>
--complete=STRING Print a list of possible completions.
<BLANKLINE>
A detailed help message.
"""
name = 'command'
def __init__(self, input_encoding=None, output_encoding=None):
self.status = None
self.result = None
self.requires_bugdir = False
self.input_encoding = None
self.output_encoding = None
self.options = [
Option(name='help', short_name='h',
help='Print a help message.',
callback=self.help),
Option(name='complete',
help='Print a list of possible completions.',
callback=self.complete),
]
self.args = []
def run(self, bugdir, options=None, args=None):
if options == None:
options = {}
if args == None:
args = []
params = {}
for option in self.options:
assert option.name not in params, params[option.name]
if option.name in options:
params[option.name] = options.pop(option.name)
elif option.arg != None:
params[option.name] = option.arg.default
else: # non-arg options are flags, set to default flag value
params[option.name] = False
assert 'user-id' not in params, params['user-id']
if 'user-id' in options:
params['user-id'] = options.pop('user-id')
else:
params['user-id'] = libbe.ui.util.user.get_user_id(bugdir.storage)
if len(options) > 0:
raise UserError, 'Invalid option passed to command %s:\n %s' \
% (self.name, '\n '.join(['%s: %s' % (k,v)
for k,v in options.items()]))
in_optional_args = False
for i,arg in enumerate(self.args):
if arg.repeatable == True:
assert i == len(self.args)-1, arg.name
if in_optional_args == True:
assert arg.optional == True, arg.name
else:
in_optional_args = arg.optional
if i < len(args):
if arg.repeatable == True:
params[arg.name] = [args[i]]
else:
params[arg.name] = args[i]
else: # no value given
assert in_optional_args == True, arg.name
if arg.repeatable == True:
params[arg.name] = [arg.default]
else:
params[arg.name] = arg.default
if len(args) > len(self.args): # add some additional repeats
assert self.args[-1].repeatable == True, self.args[-1].name
params[self.args[-1].name].extend(args[len(self.args):])
if params['help'] == True:
pass
else:
params.pop('help')
if params['complete'] != None:
pass
else:
params.pop('complete')
self._setup_io(self.input_encoding, self.output_encoding)
self.status = self._run(bugdir, **params)
return self.status
def _run(self, bugdir, **kwargs):
pass
def _setup_io(self, input_encoding=None, output_encoding=None):
if input_encoding == None:
input_encoding = libbe.util.encoding.get_input_encoding()
if output_encoding == None:
output_encoding = libbe.util.encoding.get_output_encoding()
self.stdin = codecs.getwriter(input_encoding)(sys.stdin)
self.stdin.encoding = input_encoding
self.stdout = codecs.getwriter(output_encoding)(sys.stdout)
self.stdout.encoding = output_encoding
def help(self, *args):
return '\n\n'.join([self._usage(),
self._option_help(),
self._long_help()])
def _usage(self):
usage = 'usage: be %s [options]' % self.name
num_optional = 0
for arg in self.args:
usage += ' '
if arg.optional == True:
usage += '['
num_optional += 1
usage += arg.metavar
if arg.repeatable == True:
usage += ' ...'
usage += ']'*num_optional
return usage
def _option_help(self):
o = OptionFormatter(self.options)
return o.option_help().strip('\n')
def _long_help(self):
return "A detailed help message."
def complete(self, argument=None, fragment=None):
if argument == None:
ret = ['--%s' % o.name for o in self.options]
if len(self.args) > 0 and self.args[0].completion_callback != None:
ret.extend(self.args[0].completion_callback(self, argument))
return ret
elif argument.completion_callback != None:
# finish a particular argument
return argument.completion_callback(self, argument, fragment)
return [] # the particular argument doesn't supply completion info
