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# -*- coding: UTF-8 -*-
# Copyright 2014 Red Hat, Inc.
# Part of clufter project
# Licensed under GPLv2 (a copy included | http://gnu.org/licenses/gpl-2.0.txt)
"""Command manager"""
__author__ = "Jan Pokorný <jpokorny @at@ Red Hat .dot. com>"
import logging
from .command import commands
from .error import ClufterError, ClufterPlainError, \
EC
from .plugin_registry import PluginManager
from .utils import apply_preserving_depth, \
apply_aggregation_preserving_depth, \
apply_intercalate, \
make_options
log = logging.getLogger(__name__)
class CommandManagerError(ClufterError):
pass
class CommandNotFoundError(ClufterPlainError):
def __init__(self, cmd):
super(CommandNotFoundError, self).__init__("Command not found: `{0}'",
cmd)
class CommandManager(PluginManager):
"""Class responsible for commands routing to filters or other actions"""
_default_registry = commands
def _init_handle_plugins(self, commands, flt_mgr):
log.debug("Commands before resolving: {0}"
.format(commands))
self._commands = self._resolve(flt_mgr.filters, commands)
def __iter__(self):
return self._commands.itervalues()
@staticmethod
def _resolve(filters, commands):
for cmd_name, cmd_cls in commands.items():
res_input = cmd_cls.filter_chain
res_output = apply_preserving_depth(filters.get)(res_input)
if apply_aggregation_preserving_depth(all)(res_output):
log.debug("resolve at `{0}' command: `{1}' -> {2}"
.format(cmd_name, repr(res_input), repr(res_output)))
commands[cmd_name] = cmd_cls(*res_output)
continue
# drop the command if cannot resolve any of the filters
res_input = apply_intercalate(res_input)
log.debug("cmd_name {0}".format(res_input))
map(lambda (i, x): log.warning("Resolve at `{0}' command:"
" `{1}' (#{2}) filter fail"
.format(cmd_name, res_input[i], i)),
filter(lambda (i, x): not(x),
enumerate(apply_intercalate(res_output))))
commands.pop(cmd_name)
return commands
@property
def commands(self):
return self._commands.copy()
def completion(self, completion):
return completion(iter(self))
def __call__(self, parser, args=None):
"""Follow up of the entry point, facade to particular commands"""
ec = EC.EXIT_SUCCESS
values = parser.values
try:
cmd = getattr(values, 'help', None) or args[0]
command = self._commands.get(cmd, None)
if not command:
raise CommandNotFoundError(cmd)
canonical_cmd = command.__class__.name
parser.description, options = command.parser_desc_opts
parser.option_groups[0].add_options(make_options(options))
args = ['--help'] if values.help else args[1:]
parser.defaults.update(values.__dict__) # from global options
opts, args = parser.parse_args(args)
if opts.help:
usage = '\n'.join(map(
lambda c:
"%prog [<global option> ...] {0} [<cmd option ...>]"
.format(c),
sorted(set([cmd, canonical_cmd]),
key=lambda i: int(i == canonical_cmd))
))
print parser.format_customized_help(usage=usage)
return ec
logging.getLogger().setLevel(opts.loglevel)
log.debug("Running command `{0}'; opts={1}, args={2}"
.format(cmd, opts.__dict__, args))
ec = command(opts, args)
except ClufterError as e:
ec = EC.EXIT_FAILURE
print e
if isinstance(e, CommandNotFoundError):
print "\nSupported commands:\n" + self.cmds()
#except Exception as e:
# print "OOPS: underlying unexpected exception:\n{0}".format(e)
# ec = EC.EXIT_FAILURE
return ec
def cmds(self, ind='', sep='\n'):
"""Return string containing formatted list of commands (name + desc)"""
return '\n'.join(map(
lambda (cname, ccls):
'{0}{1!s:12}{2}'.format(ind, cname,
ccls.__doc__.splitlines()[0]),
self._commands.iteritems()
))
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