Synnefo » ./kamaki

#!/usr/bin/env python

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from __future__ import print_function

import logging

from inspect import getargspec

from argparse import ArgumentParser, ArgumentError

from os.path import basename

from sys import exit, stdout, argv

from kamaki.cli.errors import CLIError, CLICmdSpecError

from kamaki.cli.utils import magenta, red, yellow, print_dict, print_list,\

    remove_colors

from kamaki.cli.command_tree import CommandTree

from kamaki.cli.argument import _arguments, parse_known_args

from kamaki.cli.history import History

cmd_spec_locations = [

    'kamaki.cli.commands',

    'kamaki.commands',

    'kamaki.cli',

    'kamaki',

    '']

_commands = CommandTree(name='kamaki',

    description='A command line tool for poking clouds')

# If empty, all commands are loaded, if not empty, only commands in this list

# e.g. [store, lele, list, lolo] is good to load store_list but not list_store

# First arg should always refer to a group

candidate_command_terms = []

allow_no_commands = False

allow_all_commands = False

allow_subclass_signatures = False

def _allow_class_in_cmd_tree(cls):

    global allow_all_commands

    if allow_all_commands:

        return True

    global allow_no_commands

    if allow_no_commands:

        return False

    term_list = cls.__name__.split('_')

    global candidate_command_terms

    index = 0

    for term in candidate_command_terms:

        try:

            index += 1 if term_list[index] == term else 0

        except IndexError:  # Whole term list matched!

            return True

    if allow_subclass_signatures:

        if index == len(candidate_command_terms) and len(term_list) > index:

            try:  # is subterm already in _commands?

                _commands.get_command('_'.join(term_list[:index + 1]))

            except KeyError:  # No, so it must be placed there

                return True

        return False

    return True if index == len(term_list) else False

def command():

    """Class decorator that registers a class as a CLI command"""

    def decorator(cls):

        """Any class with name of the form cmd1_cmd2_cmd3_... is accepted"""

        if not _allow_class_in_cmd_tree(cls):

            return cls

        cls.description, sep, cls.long_description\

            = cls.__doc__.partition('\n')

        # Generate a syntax string based on main's arguments

        spec = getargspec(cls.main.im_func)

        args = spec.args[1:]

        n = len(args) - len(spec.defaults or ())

        required = ' '.join('<%s>' % x\

            .replace('____', '[:')\

            .replace('___', ':')\

            .replace('__', ']').\

            replace('_', ' ') for x in args[:n])

        optional = ' '.join('[%s]' % x\

            .replace('____', '[:')\

            .replace('___', ':')\

            .replace('__', ']').\

            replace('_', ' ') for x in args[n:])

        cls.syntax = ' '.join(x for x in [required, optional] if x)

        if spec.varargs:

            cls.syntax += ' <%s ...>' % spec.varargs

        # store each term, one by one, first

        _commands.add_command(cls.__name__, cls.description, cls)

        return cls

    return decorator

def _update_parser(parser, arguments):

    for name, argument in arguments.items():

        try:

            argument.update_parser(parser, name)

        except ArgumentError:

            pass

def _init_parser(exe):

    parser = ArgumentParser(add_help=False)

    parser.prog = '%s <cmd_group> [<cmd_subbroup> ...] <cmd>' % exe

    _update_parser(parser, _arguments)

    return parser

def _print_error_message(cli_err):

    errmsg = '%s' % cli_err

    if cli_err.importance == 1:

        errmsg = magenta(errmsg)

    elif cli_err.importance == 2:

        errmsg = yellow(errmsg)

    elif cli_err.importance > 2:

        errmsg = red(errmsg)

    stdout.write(errmsg)

    print_list(cli_err.details)

def get_command_group(unparsed):

    groups = _arguments['config'].get_groups()

    for grp_candidate in unparsed:

        if grp_candidate in groups:

            unparsed.remove(grp_candidate)

            return grp_candidate

    return None

def load_command(group, unparsed, reload_package=False):

    global candidate_command_terms

    candidate_command_terms = [group] + unparsed

    load_group_package(group, reload_package)

    #From all possible parsed commands, chose the first match in user string

    final_cmd = _commands.get_command(group)

    for term in unparsed:

        cmd = final_cmd.get_subcmd(term)

        if cmd is not None:

            final_cmd = cmd

            unparsed.remove(cmd.name)

    return final_cmd

def shallow_load():

    """Load only group names and descriptions"""

    global allow_no_commands

    allow_no_commands = True  # load only descriptions

    for grp in _arguments['config'].get_groups():

        load_group_package(grp)

    allow_no_commands = False

def load_group_package(group, reload_package=False):

    spec_pkg = _arguments['config'].value.get(group, 'cli')

    if spec_pkg is None:

        return None

    for location in cmd_spec_locations:

        location += spec_pkg if location == '' else ('.' + spec_pkg)

        try:

            package = __import__(location, fromlist=['API_DESCRIPTION'])

        except ImportError:

            continue

        if reload_package:

            reload(package)

        for grp, descr in package.API_DESCRIPTION.items():

            _commands.add_command(grp, descr)

        return package

    raise CLICmdSpecError(details='Cmd Spec Package %s load failed' % spec_pkg)

def print_commands(prefix=None, full_depth=False):

    cmd_list = _commands.get_groups() if prefix is None\

        else _commands.get_subcommands(prefix)

    cmds = {}

    for subcmd in cmd_list:

        if subcmd.sublen() > 0:

            sublen_str = '( %s more terms ... )' % subcmd.sublen()

            cmds[subcmd.name] = [subcmd.help, sublen_str]\

                if subcmd.has_description else sublen_str

        else:

            cmds[subcmd.name] = subcmd.help

    if len(cmds) > 0:

        print('\nOptions:')

        print_dict(cmds, ident=12)

    if full_depth:

        _commands.pretty_print()

def setup_logging(silent=False, debug=False, verbose=False, include=False):

    """handle logging for clients package"""

    def add_handler(name, level, prefix=''):

        h = logging.StreamHandler()

        fmt = logging.Formatter(prefix + '%(message)s')

        h.setFormatter(fmt)

        logger = logging.getLogger(name)

        logger.addHandler(h)

        logger.setLevel(level)

    if silent:

        add_handler('', logging.CRITICAL)

    elif debug:

        add_handler('requests', logging.INFO, prefix='* ')

        add_handler('clients.send', logging.DEBUG, prefix='> ')

        add_handler('clients.recv', logging.DEBUG, prefix='< ')

    elif verbose:

        add_handler('requests', logging.INFO, prefix='* ')

        add_handler('clients.send', logging.INFO, prefix='> ')

        add_handler('clients.recv', logging.INFO, prefix='< ')

    elif include:

        add_handler('clients.recv', logging.INFO)

    else:

        add_handler('', logging.WARNING)

def _exec_cmd(instance, cmd_args, help_method):

    try:

        return instance.main(*cmd_args)

    except TypeError as err:

        if err.args and err.args[0].startswith('main()'):

            print(magenta('Syntax error'))

            if instance.get_argument('verbose'):

                print(unicode(err))

            help_method()

        else:

            raise

    except CLIError as err:

        if instance.get_argument('debug'):

            raise

        _print_error_message(err)

    return 1

def one_command():

    _debug = False

    _help = False

    _verbose = False

    try:

        exe = basename(argv[0])

        parser = _init_parser(exe)

        parsed, unparsed = parse_known_args(parser, _arguments)

        _colors = _arguments['config'].get('global', 'colors')

        if _colors != 'on':

            remove_colors()

        _history = History(_arguments['config'].get('history', 'file'))

        _history.add(' '.join([exe] + argv[1:]))

        _debug = _arguments['debug'].value

        _help = _arguments['help'].value

        _verbose = _arguments['verbose'].value

        if _arguments['version'].value:

            exit(0)

        group = get_command_group(unparsed)

        if group is None:

            parser.print_help()

            shallow_load()

            print_commands(full_depth=_debug)

            exit(0)

        cmd = load_command(group, unparsed)

        # Find the most specific subcommand

        for term in list(unparsed):

            if cmd.is_command:

                break

            if cmd.contains(term):

                cmd = cmd.get_subcmd(term)

                unparsed.remove(term)

        if _help or not cmd.is_command:

            if cmd.has_description:

                parser.description = cmd.help

            else:

                try:

                    parser.description =\

                        _commands.get_closest_ancestor_command(cmd.path).help

                except KeyError:

                    parser.description = ' '

            parser.prog = '%s %s ' % (exe, cmd.path.replace('_', ' '))

            if cmd.is_command:

                cli = cmd.get_class()

                parser.prog += cli.syntax

                _update_parser(parser, cli().arguments)

            else:

                parser.prog += '[...]'

            parser.print_help()

            # load one more level just to see what is missing

            global allow_subclass_signatures

            allow_subclass_signatures = True

            load_command(group, cmd.path.split('_')[1:], reload_package=True)

            print_commands(cmd.path, full_depth=_debug)

            exit(0)

        setup_logging(silent=_arguments['silent'].value,

            debug=_debug,

            verbose=_verbose,

            include=_arguments['include'].value)

        cli = cmd.get_class()

        executable = cli(_arguments)

        _update_parser(parser, executable.arguments)

        parser.prog = '%s %s %s'\

            % (exe, cmd.path.replace('_', ' '), cli.syntax)

        parsed, new_unparsed = parse_known_args(parser, _arguments)

        unparsed = [term for term in unparsed if term in new_unparsed]

        ret = _exec_cmd(executable, unparsed, parser.print_help)

        exit(ret)

    except Exception as err:

        if _debug:

            from traceback import print_stack

            print_stack()

            raise

        err = err if isinstance(err, CLIError)\

            else CLIError('Unexpected Error (%s): %s' % (type(err), err))

        _print_error_message(err)

        exit(1)

from command_shell import _fix_arguments, Shell

def _start_shell():

    shell = Shell()

    shell.set_prompt(basename(argv[0]))

    from kamaki import __version__ as version

    shell.greet(version)

    shell.do_EOF = shell.do_exit

    return shell

def run_shell():

    _fix_arguments()

    shell = _start_shell()

    _config = _arguments['config']

    _config.value = None

    for grp in _config.get_groups():

        global allow_all_commands

        allow_all_commands = True

        load_group_package(grp)

    setup_logging(silent=_arguments['silent'].value,

        debug=_arguments['debug'].value,

        verbose=_arguments['verbose'].value,

        include=_arguments['include'].value)

    shell.cmd_tree = _commands

    shell.run()

def main():

    if len(argv) <= 1:

        run_shell()

    else:

        one_command()