CocoMUD client

# Copyright (c) 2016, LE GOFF Vincent

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"""This module defines the default configuration."""

import locale

import os

import os.path

from textwrap import dedent

from yaml import safe_dump, safe_load

from configobj import ConfigObj

from validate import Validator

from world import World

class Configuration(object):

    """Class describing CocoMUD's configuration.

    Each configuration file is loaded here.  A configuration file can

    be either YAML or respecting the ConfigObj syntax (that is,

    basically a .ini file).  If everything goes smoothly, the ConfigObj

    objects can be found in __getitem__-ing these values, specifying

    the directory structure.

    Example:

        >>> config = Configuration()

        >>> config.load()

        >>> # In the settings/global.conf file is the following line:

        >>> #     name = CocoMUD

        >>> # You can access this configuration through:

        >>> configuration["options"]["global"]["name"]

        >>> # Or, more readable

        >>> configuration["options.global.name"]

    """

    def __init__(self, root_dir, engine):

        self.root_dir = root_dir

        self.engine = engine

        self.values = {}

    def __getitem__(self, key):

        """Return the configured value at the specified key.

        The key is a string.  It can be an identifier without periods

        (.).  In which case, the top-level data at this key is returned

        or a KeyError exception is raised.

        The 'key' can also be a list of identifiers in a string separated

        by a period.  In this case, the data is looked for in the

        directory/file/ConfigObj hierarchy.  A KeyError exception

        is raised if the expected key cannot be found.

        Thus, the two following lines are identical:

            >>> configuration["settings"]["global"]["name"]

            >>> configuration["settings.global.name"]

        """

        if "." in key:

            keys = key.split(".")

            value = self.values

            for sub_key in keys:

                if sub_key not in value:

                    raise KeyError("the key {} cannot be found, cannot " \

                            "find {}".format(repr(key), repr(sub_key)))

                value = value[sub_key]

        else:

            value = self.values[key]

        return value

    def __setitem__(self, key, value):

        """Change the value of 'key'.

        'key' is a string, and can be specified in the two ways supported

        by '__getitem__'.

        """

        if "." in key:

            keys = key.split(".")

            last = keys[-1]

            del keys[-1]

            dictionary = self.values

            for sub_key in keys:

                if sub_key not in dictionary:

                    raise KeyError("the key {} cannot be found, cannot " \

                            "find {}".format(repr(key), repr(sub_key)))

                dictionary = dictionary[sub_key]

            dictionary[last] = value

        else:

            self.values[key] = value

    def load(self):

        """Load the configuration."""

        raise NotImplementedError

    def load_config_file(self, filename, spec, root_dir=None):

        """Load the specified file using ConfigObj."""

        root_dir = root_dir or self.root_dir

        fullpath = os.path.join(root_dir, filename)

        # Create the directory structure if necessary

        directories = os.path.dirname(fullpath).split("/")

        base = directories[0]

        if not os.path.exists(base):

            os.mkdir(base)

        for directory in directories[1:]:

            base += os.path.sep + directory

            if not os.path.exists(base):

                os.mkdir(base)

        # Create the ConfigObj

        config = ConfigObj(fullpath + ".conf", configspec=spec.split("\n"))

        # Validates the configuration

        validator = Validator()

        result = config.validate(validator)

        # Saves the ConfigObj

        values = self.values

        for path in os.path.dirname(filename).split("/")[1:]:

            if path not in values:

                values[path] = {}

            values = values[path]

        values[os.path.basename(fullpath)] = config

    def load_YAML_file(self, filename):

        """Load the YAML file."""

        fullpath = self.root_dir + os.sep + filename

        if os.path.exists(fullpath + ".yml"):

            file = open(fullpath + ".yml", "r")

            datas = safe_load(file.read())

        else:

            datas = {}

        values = self.values

        for path in os.path.dirname(fullpath).split("/")[1:]:

            if path not in values:

                values[path] = {}

            values = values[path]

        values[os.path.basename(fullpath)] = datas

    def write_YAML_file(self, filename, data):

        """Write the YAML associated with the data.

        Arguments:

            filename: the filename relative to the rootdir without extension

            data: the data as a dictionary.

        """

        fullpath = self.root_dir + os.sep + filename + ".yml"

        file = open(fullpath, "w")

        try:

            safe_dump(data, file, default_flow_style=False)

        finally:

            file.close()

class Settings(Configuration):

    """Special configuration in the 'settings' directory."""

    LANGUAGES = (

        ("en", "English"),

        ("fr", "French"),

    )

    def __init__(self, engine):

        Configuration.__init__(self, "settings", engine)

    def get_language(self):

        """Return the configured language.

        If the configuration hasn't been loaded, or the configured

        language isn't valid, return "en" (English).

        """

        default = "en"

        codes = [c[0] for c in type(self).LANGUAGES]

        try:

            lang = self["options.general.language"]

            assert lang in codes

        except (KeyError, AssertionError):

            return default

        return lang

    def load(self):

        """Load all the files."""

        self.load_options()

        # Load the world configuration

        for directory in os.listdir("worlds"):

            world = World(location=directory)

            settings = GameSettings(self.engine, world)

            settings.load()

            self.engine.worlds[world.name] = world

        self.load_YAML_file("macros")

    def load_options(self):

        """Load the file containing the options."""

        lang = locale.getdefaultlocale()[0].split("_")[0]

        spec = dedent("""

            [general]

                language = option('en', 'fr', default='{lang}')

                encoding = string(default="iso8859_15")

            [accessibility]

                tab_end = boolean(default=True)

                nl_end = boolean(default=True)

            [TTS]

                on = boolean(default=True)

                outside = boolean(default=True)

        """.format(lang=lang).strip("\n"))

        self.load_config_file("options", spec)

    def write_macros(self):

        """Write the YAML data file."""

        macros = {}

        for macro in self.engine.macros.values():

            macros[macro.shortcut] = macro.action

        self.write_YAML_file("macros", macros)

class GameSettings(Configuration):

    """Game settings (specific to a game/world)."""

    def __init__(self, engine, world):

        Configuration.__init__(self, "settings", engine)

        self.world = world

    def load(self):

        """Load all the files."""

        self.load_options()

    def load_options(self):

        """Load the file containing the options."""

        world = self.world

        spec = dedent("""

            [connection]

                name = string

                hostname = string

                port = integer

        """).strip("\n")

        self.load_config_file("options", spec, world.path)

        world.name = self["options.connection.name"]

        world.hostname = self["options.connection.hostname"]

        world.port = self["options.connection.port"]

        world.settings = self["options"]