Synnefo » ./kamaki

# Copyright 2012 GRNET S.A. All rights reserved.

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from kamaki.cli.config import Config

from kamaki.cli.errors import CLISyntaxError, raiseCLIError

from kamaki.cli.utils import split_input

from logging import getLogger

from argparse import ArgumentParser, ArgumentError

try:

    from progress.bar import ShadyBar as KamakiProgressBar

except ImportError:

    # progress not installed - pls, pip install progress

    pass

kloger = getLogger('kamaki')

class Argument(object):

    """An argument that can be parsed from command line or otherwise.

    This is the general Argument class. It is suggested to extent this

    class into more specific argument types.

    """

    def __init__(self, arity, help=None, parsed_name=None, default=None):

        self.arity = int(arity)

        if help is not None:

            self.help = help

        if parsed_name is not None:

            self.parsed_name = parsed_name

        if default is not None:

            self.default = default

    @property

    def parsed_name(self):

        """the string which will be recognised by the parser as an instance

            of this argument

        """

        return getattr(self, '_parsed_name', None)

    @parsed_name.setter

    def parsed_name(self, newname):

        self._parsed_name = getattr(self, '_parsed_name', [])

        if isinstance(newname, list) or isinstance(newname, tuple):

            self._parsed_name += list(newname)

        else:

            self._parsed_name.append(unicode(newname))

    @property

    def help(self):

        """a user friendly help message"""

        return getattr(self, '_help', None)

    @help.setter

    def help(self, newhelp):

        self._help = unicode(newhelp)

    @property

    def arity(self):

        """negative for repeating, 0 for flag, 1 or more for values"""

        return getattr(self, '_arity', None)

    @arity.setter

    def arity(self, newarity):

        newarity = int(newarity)

        self._arity = newarity

    @property

    def default(self):

        """the value of this argument when not set"""

        if not hasattr(self, '_default'):

            self._default = False if self.arity == 0 else None

        return self._default

    @default.setter

    def default(self, newdefault):

        self._default = newdefault

    @property

    def value(self):

        """the value of the argument"""

        return getattr(self, '_value', self.default)

    @value.setter

    def value(self, newvalue):

        self._value = newvalue

    def update_parser(self, parser, name):

        """Update argument parser with self info"""

        action = 'append' if self.arity < 0\

            else 'store_true' if self.arity == 0\

            else 'store'

        parser.add_argument(*self.parsed_name, dest=name, action=action,

            default=self.default, help=self.help)

    def main(self):

        """Overide this method to give functionality to your args"""

        raise NotImplementedError

class ConfigArgument(Argument):

    """Manage a kamaki configuration (file)"""

    _config_file = None

    @property

    def value(self):

        """A Config object"""

        super(self.__class__, self).value

        return super(self.__class__, self).value

    @value.setter

    def value(self, config_file):

        if config_file:

            self._value = Config(config_file)

            self._config_file = config_file

        elif self._config_file:

            self._value = Config(self._config_file)

        else:

            self._value = Config()

    def get(self, group, term):

        """Get a configuration setting from the Config object"""

        return self.value.get(group, term)

    def get_groups(self):

        return self.value.apis()

_config_arg = ConfigArgument(1, 'Path to configuration file', '--config')

class CmdLineConfigArgument(Argument):

    """Set a run-time setting option (not persistent)"""

    def __init__(self, config_arg, help='', parsed_name=None, default=None):

        super(self.__class__, self).__init__(1, help, parsed_name, default)

        self._config_arg = config_arg

    @property

    def value(self):

        """A key=val option"""

        return super(self.__class__, self).value

    @value.setter

    def value(self, options):

        if options == self.default:

            return

        if not isinstance(options, list):

            options = [unicode(options)]

        for option in options:

            keypath, sep, val = option.partition('=')

            if not sep:

                raiseCLIError(CLISyntaxError('Argument Syntax Error '),

                    details=['%s is missing a "="',

                    ' (usage: -o section.key=val)' % option]

                )

            section, sep, key = keypath.partition('.')

        if not sep:

            key = section

            section = 'global'

        self._config_arg.value.override(

            section.strip(),

            key.strip(),

            val.strip())

class FlagArgument(Argument):

    """

    :value: true if set, false otherwise

    """

    def __init__(self, help='', parsed_name=None, default=False):

        super(FlagArgument, self).__init__(0, help, parsed_name, default)

class ValueArgument(Argument):

    """

    :value type: string

    :value returns: given value or default

    """

    def __init__(self, help='', parsed_name=None, default=None):

        super(ValueArgument, self).__init__(1, help, parsed_name, default)

class IntArgument(ValueArgument):

    @property

    def value(self):

        """integer (type checking)"""

        return getattr(self, '_value', self.default)

    @value.setter

    def value(self, newvalue):

        if newvalue == self.default:

            self._value = self.default

            return

        try:

            self._value = int(newvalue)

        except ValueError:

            raiseCLIError(CLISyntaxError('IntArgument Error'),

                details='Value %s not an int' % newvalue)

class VersionArgument(FlagArgument):

    """A flag argument with that prints current version"""

    @property

    def value(self):

        """bool"""

        return super(self.__class__, self).value

    @value.setter

    def value(self, newvalue):

        self._value = newvalue

        self.main()

    def main(self):

        """Print current version"""

        if self.value:

            import kamaki

            print('kamaki %s' % kamaki.__version__)

class KeyValueArgument(Argument):

    """A Value Argument that can be repeated

    :syntax: --<arg> key1=value1 --<arg> key2=value2 ...

    """

    def __init__(self, help='', parsed_name=None, default=[]):

        super(KeyValueArgument, self).__init__(-1, help, parsed_name, default)

    @property

    def value(self):

        """

        :input: key=value

        :output: {'key1':'value1', 'key2':'value2', ...}

        """

        return super(KeyValueArgument, self).value

    @value.setter

    def value(self, keyvalue_pairs):

        self._value = {}

        for pair in keyvalue_pairs:

            key, sep, val = pair.partition('=')

            if not sep:

                raiseCLIError(CLISyntaxError('Argument syntax error '),

                    details='%s is missing a "=" (usage: key1=val1 )\n' % pair)

            self._value[key.strip()] = val.strip()

class ProgressBarArgument(FlagArgument):

    """Manage a progress bar"""

    def __init__(self, help='', parsed_name='', default=True):

        self.suffix = '%(percent)d%%'

        super(ProgressBarArgument, self).__init__(help, parsed_name, default)

        try:

            KamakiProgressBar

        except NameError:

            kloger.warning('no progress bar functionality')

    def clone(self):

        """Get a modifiable copy of this bar"""

        newarg = ProgressBarArgument(

            self.help,

            self.parsed_name,

            self.default)

        newarg._value = self._value

        return newarg

    def get_generator(self, message, message_len=25):

        """Get a generator to handle progress of the bar (gen.next())"""

        if self.value:

            return None

        try:

            self.bar = KamakiProgressBar()

        except NameError:

            self.value = None

            return self.value

        self.bar.message = message.ljust(message_len)

        self.bar.suffix = '%(percent)d%% - %(eta)ds'

        self.bar.start()

        def progress_gen(n):

            for i in self.bar.iter(range(int(n))):

                yield

            yield

        return progress_gen

    def finish(self):

        """Stop progress bar, return terminal cursor to user"""

        if self.value:

            return

        mybar = getattr(self, 'bar', None)

        if mybar:

            mybar.finish()

_arguments = dict(config=_config_arg,

    help=Argument(0, 'Show help message', ('-h', '--help')),

    debug=FlagArgument('Include debug output', ('-d', '--debug')),

    include=FlagArgument('Include protocol headers in the output',

        ('-i', '--include')),

    silent=FlagArgument('Do not output anything', ('-s', '--silent')),

    verbose=FlagArgument('More info at response', ('-v', '--verbose')),

    version=VersionArgument('Print current version', ('-V', '--version')),

    options=CmdLineConfigArgument(_config_arg,

        'Override a config value',

        ('-o', '--options'))

)

"""Initial command line interface arguments"""

"""

Mechanism:

    init_parser

    parse_known_args

    manage top-level user arguments input

    find user-requested command

    add command-specific arguments to dict

    update_arguments

"""

class ArgumentParseManager(object):

    """Manage (initialize and update) an ArgumentParser object"""

    parser = None

    _arguments = {}

    _parser_modified = False

    _parsed = None

    _unparsed = None

    def __init__(self, exe, arguments=None):

        """

        :param exe: (str) the basic command (e.g. 'kamaki')

        :param arguments: (dict) if given, overrides the global _argument as

            the parsers arguments specification

        """

        self.parser = ArgumentParser(add_help=False)

        self.syntax = '%s <cmd_group> [<cmd_subbroup> ...] <cmd>' % exe

        if arguments:

            self.arguments = arguments

        else:

            global _arguments

            self.arguments = _arguments

        self.parse()

    @property

    def syntax(self):

        """The command syntax (useful for help messages, descriptions, etc)"""

        return self.parser.prog

    @syntax.setter

    def syntax(self, new_syntax):

        self.parser.prog = new_syntax

    @property

    def arguments(self):

        """(dict) arguments the parser should be aware of"""

        return self._arguments

    @arguments.setter

    def arguments(self, new_arguments):

        if new_arguments:

            assert isinstance(new_arguments, dict)

        self._arguments = new_arguments

        self.update_parser()

    @property

    def parsed(self):

        """(Namespace) parser-matched terms"""

        if self._parser_modified:

            self.parse()

        return self._parsed

    @property

    def unparsed(self):

        """(list) parser-unmatched terms"""

        if self._parser_modified:

            self.parse()

        return self._unparsed

    def update_parser(self, arguments=None):

        """Load argument specifications to parser

        :param arguments: if not given, update self.arguments instead

        """

        if not arguments:

            arguments = self._arguments

        for name, arg in arguments.items():

            try:

                arg.update_parser(self.parser, name)

                self._parser_modified = True

            except ArgumentError:

                pass

    def update_arguments(self, new_arguments):

        """Add to / update existing arguments

        :param new_arguments: (dict)

        """

        if new_arguments:

            assert isinstance(new_arguments, dict)

            self._arguments.update(new_arguments)

            self.update_parser()

    def parse(self, new_args=None):

        """Do parse user input"""

        if new_args:

            self._parsed, unparsed = self.parser.parse_known_args(new_args)

        else:

            self._parsed, unparsed = self.parser.parse_known_args()

        for name, arg in self.arguments.items():

            arg.value = getattr(self._parsed, name, arg.default)

        self._unparsed = []

        for term in unparsed:

            self._unparsed += split_input(' \'%s\' ' % term)

        self._parser_modified = False