# -*- coding: utf-8 -*-
"""
    babel.messages.frontend
    ~~~~~~~~~~~~~~~~~~~~~~~

    Frontends for the message extraction functionality.

    :copyright: (c) 2013-2018 by the Babel Team.
    :license: BSD, see LICENSE for more details.
"""
from __future__ import print_function

import logging
import optparse
import os
import re
import shutil
import sys
import tempfile
from datetime import datetime
from locale import getpreferredencoding

from babel import __version__ as VERSION
from babel import Locale, localedata
from babel._compat import StringIO, string_types, text_type, PY2
from babel.core import UnknownLocaleError
from babel.messages.catalog import Catalog
from babel.messages.extract import DEFAULT_KEYWORDS, DEFAULT_MAPPING, check_and_call_extract_file, extract_from_dir
from babel.messages.mofile import write_mo
from babel.messages.pofile import read_po, write_po
from babel.util import LOCALTZ, odict
from distutils import log as distutils_log
from distutils.cmd import Command as _Command
from distutils.errors import DistutilsOptionError, DistutilsSetupError

try:
    from ConfigParser import RawConfigParser
except ImportError:
    from configparser import RawConfigParser


po_file_read_mode = ('rU' if PY2 else 'r')


def listify_value(arg, split=None):
    """
    Make a list out of an argument.

    Values from `distutils` argument parsing are always single strings;
    values from `optparse` parsing may be lists of strings that may need
    to be further split.

    No matter the input, this function returns a flat list of whitespace-trimmed
    strings, with `None` values filtered out.

    >>> listify_value("foo bar")
    ['foo', 'bar']
    >>> listify_value(["foo bar"])
    ['foo', 'bar']
    >>> listify_value([["foo"], "bar"])
    ['foo', 'bar']
    >>> listify_value([["foo"], ["bar", None, "foo"]])
    ['foo', 'bar', 'foo']
    >>> listify_value("foo, bar, quux", ",")
    ['foo', 'bar', 'quux']

    :param arg: A string or a list of strings
    :param split: The argument to pass to `str.split()`.
    :return:
    """
    out = []

    if not isinstance(arg, (list, tuple)):
        arg = [arg]

    for val in arg:
        if val is None:
            continue
        if isinstance(val, (list, tuple)):
            out.extend(listify_value(val, split=split))
            continue
        out.extend(s.strip() for s in text_type(val).split(split))
    assert all(isinstance(val, string_types) for val in out)
    return out


class Command(_Command):
    # This class is a small shim between Distutils commands and
    # optparse option parsing in the frontend command line.

    #: Option name to be input as `args` on the script command line.
    as_args = None

    #: Options which allow multiple values.
    #: This is used by the `optparse` transmogrification code.
    multiple_value_options = ()

    #: Options which are booleans.
    #: This is used by the `optparse` transmogrification code.
    # (This is actually used by distutils code too, but is never
    # declared in the base class.)
    boolean_options = ()

    #: Option aliases, to retain standalone command compatibility.
    #: Distutils does not support option aliases, but optparse does.
    #: This maps the distutils argument name to an iterable of aliases
    #: that are usable with optparse.
    option_aliases = {}

    #: Choices for options that needed to be restricted to specific
    #: list of choices.
    option_choices = {}

    #: Log object. To allow replacement in the script command line runner.
    log = distutils_log

    def __init__(self, dist=None):
        # A less strict version of distutils' `__init__`.
        self.distribution = dist
        self.initialize_options()
        self._dry_run = None
        self.verbose = False
        self.force = None
        self.help = 0
        self.finalized = 0


class compile_catalog(Command):
    """Catalog compilation command for use in ``setup.py`` scripts.

    If correctly installed, this command is available to Setuptools-using
    setup scripts automatically. For projects using plain old ``distutils``,
    the command needs to be registered explicitly in ``setup.py``::

        from babel.messages.frontend import compile_catalog

        setup(
            ...
            cmdclass = {'compile_catalog': compile_catalog}
        )

    .. versionadded:: 0.9
    """

    description = 'compile message catalogs to binary MO files'
    user_options = [
        ('domain=', 'D',
         "domains of PO files (space separated list, default 'messages')"),
        ('directory=', 'd',
         'path to base directory containing the catalogs'),
        ('input-file=', 'i',
         'name of the input file'),
        ('output-file=', 'o',
         "name of the output file (default "
         "'<output_dir>/<locale>/LC_MESSAGES/<domain>.mo')"),
        ('locale=', 'l',
         'locale of the catalog to compile'),
        ('use-fuzzy', 'f',
         'also include fuzzy translations'),
        ('statistics', None,
         'print statistics about translations')
    ]
    boolean_options = ['use-fuzzy', 'statistics']

    def initialize_options(self):
        self.domain = 'messages'
        self.directory = None
        self.input_file = None
        self.output_file = None
        self.locale = None
        self.use_fuzzy = False
        self.statistics = False

    def finalize_options(self):
        self.domain = listify_value(self.domain)
        if not self.input_file and not self.directory:
            raise DistutilsOptionError('you must specify either the input file '
                                       'or the base directory')
        if not self.output_file and not self.directory:
            raise DistutilsOptionError('you must specify either the output file '
                                       'or the base directory')

    def run(self):
        for domain in self.domain:
            self._run_domain(domain)

    def _run_domain(self, domain):
        po_files = []
        mo_files = []

        if not self.input_file:
            if self.locale:
                po_files.append((self.locale,
                                 os.path.join(self.directory, self.locale,
                                              'LC_MESSAGES',
                                              domain + '.po')))
                mo_files.append(os.path.join(self.directory, self.locale,
                                             'LC_MESSAGES',
                                             domain + '.mo'))
            else:
                for locale in os.listdir(self.directory):
                    po_file = os.path.join(self.directory, locale,
                                           'LC_MESSAGES', domain + '.po')
                    if os.path.exists(po_file):
                        po_files.append((locale, po_file))
                        mo_files.append(os.path.join(self.directory, locale,
                                                     'LC_MESSAGES',
                                                     domain + '.mo'))
        else:
            po_files.append((self.locale, self.input_file))
            if self.output_file:
                mo_files.append(self.output_file)
            else:
                mo_files.append(os.path.join(self.directory, self.locale,
                                             'LC_MESSAGES',
                                             domain + '.mo'))

        if not po_files:
            raise DistutilsOptionError('no message catalogs found')

        for idx, (locale, po_file) in enumerate(po_files):
            mo_file = mo_files[idx]
            with open(po_file, 'rb') as infile:
                catalog = read_po(infile, locale)

            if self.statistics:
                translated = 0
                for message in list(catalog)[1:]:
                    if message.string:
                        translated += 1
                percentage = 0
                if len(catalog):
                    percentage = translated * 100 // len(catalog)
                self.log.info(
                    '%d of %d messages (%d%%) translated in %s',
                    translated, len(catalog), percentage, po_file
                )

            if catalog.fuzzy and not self.use_fuzzy:
                self.log.info('catalog %s is marked as fuzzy, skipping', po_file)
                continue

            for message, errors in catalog.check():
                for error in errors:
                    self.log.error(
                        'error: %s:%d: %s', po_file, message.lineno, error
                    )

            self.log.info('compiling catalog %s to %s', po_file, mo_file)

            with open(mo_file, 'wb') as outfile:
                write_mo(outfile, catalog, use_fuzzy=self.use_fuzzy)


class extract_messages(Command):
    """Message extraction command for use in ``setup.py`` scripts.

    If correctly installed, this command is available to Setuptools-using
    setup scripts automatically. For projects using plain old ``distutils``,
    the command needs to be registered explicitly in ``setup.py``::

        from babel.messages.frontend import extract_messages

        setup(
            ...
            cmdclass = {'extract_messages': extract_messages}
        )
    """

    description = 'extract localizable strings from the project code'
    user_options = [
        ('charset=', None,
         'charset to use in the output file (default "utf-8")'),
        ('keywords=', 'k',
         'space-separated list of keywords to look for in addition to the '
         'defaults (may be repeated multiple times)'),
        ('no-default-keywords', None,
         'do not include the default keywords'),
        ('mapping-file=', 'F',
         'path to the mapping configuration file'),
        ('no-location', None,
         'do not include location comments with filename and line number'),
        ('add-location=', None,
         'location lines format. If it is not given or "full", it generates '
         'the lines with both file name and line number. If it is "file", '
         'the line number part is omitted. If it is "never", it completely '
         'suppresses the lines (same as --no-location).'),
        ('omit-header', None,
         'do not include msgid "" entry in header'),
        ('output-file=', 'o',
         'name of the output file'),
        ('width=', 'w',
         'set output line width (default 76)'),
        ('no-wrap', None,
         'do not break long message lines, longer than the output line width, '
         'into several lines'),
        ('sort-output', None,
         'generate sorted output (default False)'),
        ('sort-by-file', None,
         'sort output by file location (default False)'),
        ('msgid-bugs-address=', None,
         'set report address for msgid'),
        ('copyright-holder=', None,
         'set copyright holder in output'),
        ('project=', None,
         'set project name in output'),
        ('version=', None,
         'set project version in output'),
        ('add-comments=', 'c',
         'place comment block with TAG (or those preceding keyword lines) in '
         'output file. Separate multiple TAGs with commas(,)'),  # TODO: Support repetition of this argument
        ('strip-comments', 's',
         'strip the comment TAGs from the comments.'),
        ('input-paths=', None,
         'files or directories that should be scanned for messages. Separate multiple '
         'files or directories with commas(,)'),  # TODO: Support repetition of this argument
        ('input-dirs=', None,  # TODO (3.x): Remove me.
         'alias for input-paths (does allow files as well as directories).'),
    ]
    boolean_options = [
        'no-default-keywords', 'no-location', 'omit-header', 'no-wrap',
        'sort-output', 'sort-by-file', 'strip-comments'
    ]
    as_args = 'input-paths'
    multiple_value_options = ('add-comments', 'keywords')
    option_aliases = {
        'keywords': ('--keyword',),
        'mapping-file': ('--mapping',),
        'output-file': ('--output',),
        'strip-comments': ('--strip-comment-tags',),
    }
    option_choices = {
        'add-location': ('full', 'file', 'never',),
    }

    def initialize_options(self):
        self.charset = 'utf-8'
        self.keywords = None
        self.no_default_keywords = False
        self.mapping_file = None
        self.no_location = False
        self.add_location = None
        self.omit_header = False
        self.output_file = None
        self.input_dirs = None
        self.input_paths = None
        self.width = None
        self.no_wrap = False
        self.sort_output = False
        self.sort_by_file = False
        self.msgid_bugs_address = None
        self.copyright_holder = None
        self.project = None
        self.version = None
        self.add_comments = None
        self.strip_comments = False
        self.include_lineno = True

    def finalize_options(self):
        if self.input_dirs:
            if not self.input_paths:
                self.input_paths = self.input_dirs
            else:
                raise DistutilsOptionError(
                    'input-dirs and input-paths are mutually exclusive'
                )

        if self.no_default_keywords:
            keywords = {}
        else:
            keywords = DEFAULT_KEYWORDS.copy()

        keywords.update(parse_keywords(listify_value(self.keywords)))

        self.keywords = keywords

        if not self.keywords:
            raise DistutilsOptionError('you must specify new keywords if you '
                                       'disable the default ones')

        if not self.output_file:
            raise DistutilsOptionError('no output file specified')
        if self.no_wrap and self.width:
            raise DistutilsOptionError("'--no-wrap' and '--width' are mutually "
                                       "exclusive")
        if not self.no_wrap and not self.width:
            self.width = 76
        elif self.width is not None:
            self.width = int(self.width)

        if self.sort_output and self.sort_by_file:
            raise DistutilsOptionError("'--sort-output' and '--sort-by-file' "
                                       "are mutually exclusive")

        if self.input_paths:
            if isinstance(self.input_paths, string_types):
                self.input_paths = re.split(r',\s*', self.input_paths)
        elif self.distribution is not None:
            self.input_paths = dict.fromkeys([
                k.split('.', 1)[0]
                for k in (self.distribution.packages or ())
            ]).keys()
        else:
            self.input_paths = []

        if not self.input_paths:
            raise DistutilsOptionError("no input files or directories specified")

        for path in self.input_paths:
            if not os.path.exists(path):
                raise DistutilsOptionError("Input path: %s does not exist" % path)

        self.add_comments = listify_value(self.add_comments or (), ",")

        if self.distribution:
            if not self.project:
                self.project = self.distribution.get_name()
            if not self.version:
                self.version = self.distribution.get_version()

        if self.add_location == 'never':
            self.no_location = True
        elif self.add_location == 'file':
            self.include_lineno = False

    def run(self):
        mappings = self._get_mappings()
        with open(self.output_file, 'wb') as outfile:
            catalog = Catalog(project=self.project,
                              version=self.version,
                              msgid_bugs_address=self.msgid_bugs_address,
                              copyright_holder=self.copyright_holder,
                              charset=self.charset)

            for path, method_map, options_map in mappings:
                def callback(filename, method, options):
                    if method == 'ignore':
                        return

                    # If we explicitly provide a full filepath, just use that.
                    # Otherwise, path will be the directory path and filename
                    # is the relative path from that dir to the file.
                    # So we can join those to get the full filepath.
                    if os.path.isfile(path):
                        filepath = path
                    else:
                        filepath = os.path.normpath(os.path.join(path, filename))

                    optstr = ''
                    if options:
                        optstr = ' (%s)' % ', '.join(['%s="%s"' % (k, v) for
                                                      k, v in options.items()])
                    self.log.info('extracting messages from %s%s', filepath, optstr)

                if os.path.isfile(path):
                    current_dir = os.getcwd()
                    extracted = check_and_call_extract_file(
                        path, method_map, options_map,
                        callback, self.keywords, self.add_comments,
                        self.strip_comments, current_dir
                    )
                else:
                    extracted = extract_from_dir(
                        path, method_map, options_map,
                        keywords=self.keywords,
                        comment_tags=self.add_comments,
                        callback=callback,
                        strip_comment_tags=self.strip_comments
                    )
                for filename, lineno, message, comments, context in extracted:
                    if os.path.isfile(path):
                        filepath = filename  # already normalized
                    else:
                        filepath = os.path.normpath(os.path.join(path, filename))

                    catalog.add(message, None, [(filepath, lineno)],
                                auto_comments=comments, context=context)

            self.log.info('writing PO template file to %s', self.output_file)
            write_po(outfile, catalog, width=self.width,
                     no_location=self.no_location,
                     omit_header=self.omit_header,
                     sort_output=self.sort_output,
                     sort_by_file=self.sort_by_file,
                     include_lineno=self.include_lineno)

    def _get_mappings(self):
        mappings = []

        if self.mapping_file:
            with open(self.mapping_file, po_file_read_mode) as fileobj:
                method_map, options_map = parse_mapping(fileobj)
            for path in self.input_paths:
                mappings.append((path, method_map, options_map))

        elif getattr(self.distribution, 'message_extractors', None):
            message_extractors = self.distribution.message_extractors
            for path, mapping in message_extractors.items():
                if isinstance(mapping, string_types):
                    method_map, options_map = parse_mapping(StringIO(mapping))
                else:
                    method_map, options_map = [], {}
                    for pattern, method, options in mapping:
                        method_map.append((pattern, method))
                        options_map[pattern] = options or {}
                mappings.append((path, method_map, options_map))

        else:
            for path in self.input_paths:
                mappings.append((path, DEFAULT_MAPPING, {}))

        return mappings


def check_message_extractors(dist, name, value):
    """Validate the ``message_extractors`` keyword argument to ``setup()``.

    :param dist: the distutils/setuptools ``Distribution`` object
    :param name: the name of the keyword argument (should always be
                 "message_extractors")
    :param value: the value of the keyword argument
    :raise `DistutilsSetupError`: if the value is not valid
    """
    assert name == 'message_extractors'
    if not isinstance(value, dict):
        raise DistutilsSetupError('the value of the "message_extractors" '
                                  'parameter must be a dictionary')


class init_catalog(Command):
    """New catalog initialization command for use in ``setup.py`` scripts.

    If correctly installed, this command is available to Setuptools-using
    setup scripts automatically. For projects using plain old ``distutils``,
    the command needs to be registered explicitly in ``setup.py``::

        from babel.messages.frontend import init_catalog

        setup(
            ...
            cmdclass = {'init_catalog': init_catalog}
        )
    """

    description = 'create a new catalog based on a POT file'
    user_options = [
        ('domain=', 'D',
         "domain of PO file (default 'messages')"),
        ('input-file=', 'i',
         'name of the input file'),
        ('output-dir=', 'd',
         'path to output directory'),
        ('output-file=', 'o',
         "name of the output file (default "
         "'<output_dir>/<locale>/LC_MESSAGES/<domain>.po')"),
        ('locale=', 'l',
         'locale for the new localized catalog'),
        ('width=', 'w',
         'set output line width (default 76)'),
        ('no-wrap', None,
         'do not break long message lines, longer than the output line width, '
         'into several lines'),
    ]
    boolean_options = ['no-wrap']

    def initialize_options(self):
        self.output_dir = None
        self.output_file = None
        self.input_file = None
        self.locale = None
        self.domain = 'messages'
        self.no_wrap = False
        self.width = None

    def finalize_options(self):
        if not self.input_file:
            raise DistutilsOptionError('you must specify the input file')

        if not self.locale:
            raise DistutilsOptionError('you must provide a locale for the '
                                       'new catalog')
        try:
            self._locale = Locale.parse(self.locale)
        except UnknownLocaleError as e:
            raise DistutilsOptionError(e)

        if not self.output_file and not self.output_dir:
            raise DistutilsOptionError('you must specify the output directory')
        if not self.output_file:
            self.output_file = os.path.join(self.output_dir, self.locale,
                                            'LC_MESSAGES', self.domain + '.po')

        if not os.path.exists(os.path.dirname(self.output_file)):
            os.makedirs(os.path.dirname(self.output_file))
        if self.no_wrap and self.width:
            raise DistutilsOptionError("'--no-wrap' and '--width' are mutually "
                                       "exclusive")
        if not self.no_wrap and not self.width:
            self.width = 76
        elif self.width is not None:
            self.width = int(self.width)

    def run(self):
        self.log.info(
            'creating catalog %s based on %s', self.output_file, self.input_file
        )

        with open(self.input_file, 'rb') as infile:
            # Although reading from the catalog template, read_po must be fed
            # the locale in order to correctly calculate plurals
            catalog = read_po(infile, locale=self.locale)

        catalog.locale = self._locale
        catalog.revision_date = datetime.now(LOCALTZ)
        catalog.fuzzy = False

        with open(self.output_file, 'wb') as outfile:
            write_po(outfile, catalog, width=self.width)


class update_catalog(Command):
    """Catalog merging command for use in ``setup.py`` scripts.

    If correctly installed, this command is available to Setuptools-using
    setup scripts automatically. For projects using plain old ``distutils``,
    the command needs to be registered explicitly in ``setup.py``::

        from babel.messages.frontend import update_catalog

        setup(
            ...
            cmdclass = {'update_catalog': update_catalog}
        )

    .. versionadded:: 0.9
    """

    description = 'update message catalogs from a POT file'
    user_options = [
        ('domain=', 'D',
         "domain of PO file (default 'messages')"),
        ('input-file=', 'i',
         'name of the input file'),
        ('output-dir=', 'd',
         'path to base directory containing the catalogs'),
        ('output-file=', 'o',
         "name of the output file (default "
         "'<output_dir>/<locale>/LC_MESSAGES/<domain>.po')"),
        ('locale=', 'l',
         'locale of the catalog to compile'),
        ('width=', 'w',
         'set output line width (default 76)'),
        ('no-wrap', None,
         'do not break long message lines, longer than the output line width, '
         'into several lines'),
        ('ignore-obsolete=', None,
         'whether to omit obsolete messages from the output'),
        ('no-fuzzy-matching', 'N',
         'do not use fuzzy matching'),
        ('update-header-comment', None,
         'update target header comment'),
        ('previous', None,
         'keep previous msgids of translated messages')
    ]
    boolean_options = ['no-wrap', 'ignore-obsolete', 'no-fuzzy-matching', 'previous', 'update-header-comment']

    def initialize_options(self):
        self.domain = 'messages'
        self.input_file = None
        self.output_dir = None
        self.output_file = None
        self.locale = None
        self.width = None
        self.no_wrap = False
        self.ignore_obsolete = False
        self.no_fuzzy_matching = False
        self.update_header_comment = False
        self.previous = False

    def finalize_options(self):
        if not self.input_file:
            raise DistutilsOptionError('you must specify the input file')
        if not self.output_file and not self.output_dir:
            raise DistutilsOptionError('you must specify the output file or '
                                       'directory')
        if self.output_file and not self.locale:
            raise DistutilsOptionError('you must specify the locale')
        if self.no_wrap and self.width:
            raise DistutilsOptionError("'--no-wrap' and '--width' are mutually "
                                       "exclusive")
        if not self.no_wrap and not self.width:
            self.width = 76
        elif self.width is not None:
            self.width = int(self.width)
        if self.no_fuzzy_matching and self.previous:
            self.previous = False

    def run(self):
        po_files = []
        if not self.output_file:
            if self.locale:
                po_files.append((self.locale,
                                 os.path.join(self.output_dir, self.locale,
                                              'LC_MESSAGES',
                                              self.domain + '.po')))
            else:
                for locale in os.listdir(self.output_dir):
                    po_file = os.path.join(self.output_dir, locale,
                                           'LC_MESSAGES',
                                           self.domain + '.po')
                    if os.path.exists(po_file):
                        po_files.append((locale, po_file))
        else:
            po_files.append((self.locale, self.output_file))

        if not po_files:
            raise DistutilsOptionError('no message catalogs found')

        domain = self.domain
        if not domain:
            domain = os.path.splitext(os.path.basename(self.input_file))[0]

        with open(self.input_file, 'rb') as infile:
            template = read_po(infile)

        for locale, filename in po_files:
            self.log.info('updating catalog %s based on %s', filename, self.input_file)
            with open(filename, 'rb') as infile:
                catalog = read_po(infile, locale=locale, domain=domain)

            catalog.update(
                template, self.no_fuzzy_matching,
                update_header_comment=self.update_header_comment
            )

            tmpname = os.path.join(os.path.dirname(filename),
                                   tempfile.gettempprefix() +
                                   os.path.basename(filename))
            try:
                with open(tmpname, 'wb') as tmpfile:
                    write_po(tmpfile, catalog,
                             ignore_obsolete=self.ignore_obsolete,
                             include_previous=self.previous, width=self.width)
            except:
                os.remove(tmpname)
                raise

            try:
                os.rename(tmpname, filename)
            except OSError:
                # We're probably on Windows, which doesn't support atomic
                # renames, at least not through Python
                # If the error is in fact due to a permissions problem, that
                # same error is going to be raised from one of the following
                # operations
                os.remove(filename)
                shutil.copy(tmpname, filename)
                os.remove(tmpname)


class CommandLineInterface(object):
    """Command-line interface.

    This class provides a simple command-line interface to the message
    extraction and PO file generation functionality.
    """

    usage = '%%prog %s [options] %s'
    version = '%%prog %s' % VERSION
    commands = {
        'compile': 'compile message catalogs to MO files',
        'extract': 'extract messages from source files and generate a POT file',
        'init': 'create new message catalogs from a POT file',
        'update': 'update existing message catalogs from a POT file'
    }

    command_classes = {
        'compile': compile_catalog,
        'extract': extract_messages,
        'init': init_catalog,
        'update': update_catalog,
    }

    log = None  # Replaced on instance level

    def run(self, argv=None):
        """Main entry point of the command-line interface.

        :param argv: list of arguments passed on the command-line
        """

        if argv is None:
            argv = sys.argv

        self.parser = optparse.OptionParser(usage=self.usage % ('command', '[args]'),
                                            version=self.version)
        self.parser.disable_interspersed_args()
        self.parser.print_help = self._help
        self.parser.add_option('--list-locales', dest='list_locales',
                               action='store_true',
                               help="print all known locales and exit")
        self.parser.add_option('-v', '--verbose', action='store_const',
                               dest='loglevel', const=logging.DEBUG,
                               help='print as much as possible')
        self.parser.add_option('-q', '--quiet', action='store_const',
                               dest='loglevel', const=logging.ERROR,
                               help='print as little as possible')
        self.parser.set_defaults(list_locales=False, loglevel=logging.INFO)

        options, args = self.parser.parse_args(argv[1:])

        self._configure_logging(options.loglevel)
        if options.list_locales:
            identifiers = localedata.locale_identifiers()
            longest = max([len(identifier) for identifier in identifiers])
            identifiers.sort()
            format = u'%%-%ds %%s' % (longest + 1)
            for identifier in identifiers:
                locale = Locale.parse(identifier)
                output = format % (identifier, locale.english_name)
                print(output.encode(sys.stdout.encoding or
                                    getpreferredencoding() or
                                    'ascii', 'replace'))
            return 0

        if not args:
            self.parser.error('no valid command or option passed. '
                              'Try the -h/--help option for more information.')

        cmdname = args[0]
        if cmdname not in self.commands:
            self.parser.error('unknown command "%s"' % cmdname)

        cmdinst = self._configure_command(cmdname, args[1:])
        return cmdinst.run()

    def _configure_logging(self, loglevel):
        self.log = logging.getLogger('babel')
        self.log.setLevel(loglevel)
        # Don't add a new handler for every instance initialization (#227), this
        # would cause duplicated output when the CommandLineInterface as an
        # normal Python class.
        if self.log.handlers:
            handler = self.log.handlers[0]
        else:
            handler = logging.StreamHandler()
            self.log.addHandler(handler)
        handler.setLevel(loglevel)
        formatter = logging.Formatter('%(message)s')
        handler.setFormatter(formatter)

    def _help(self):
        print(self.parser.format_help())
        print("commands:")
        longest = max([len(command) for command in self.commands])
        format = "  %%-%ds %%s" % max(8, longest + 1)
        commands = sorted(self.commands.items())
        for name, description in commands:
            print(format % (name, description))

    def _configure_command(self, cmdname, argv):
        """
        :type cmdname: str
        :type argv: list[str]
        """
        cmdclass = self.command_classes[cmdname]
        cmdinst = cmdclass()
        if self.log:
            cmdinst.log = self.log  # Use our logger, not distutils'.
        assert isinstance(cmdinst, Command)
        cmdinst.initialize_options()

        parser = optparse.OptionParser(
            usage=self.usage % (cmdname, ''),
            description=self.commands[cmdname]
        )
        as_args = getattr(cmdclass, "as_args", ())
        for long, short, help in cmdclass.user_options:
            name = long.strip("=")
            default = getattr(cmdinst, name.replace('-', '_'))
            strs = ["--%s" % name]
            if short:
                strs.append("-%s" % short)
            strs.extend(cmdclass.option_aliases.get(name, ()))
            choices = cmdclass.option_choices.get(name, None)
            if name == as_args:
                parser.usage += "<%s>" % name
            elif name in cmdclass.boolean_options:
                parser.add_option(*strs, action="store_true", help=help)
            elif name in cmdclass.multiple_value_options:
                parser.add_option(*strs, action="append", help=help, choices=choices)
            else:
                parser.add_option(*strs, help=help, default=default, choices=choices)
        options, args = parser.parse_args(argv)

        if as_args:
            setattr(options, as_args.replace('-', '_'), args)

        for key, value in vars(options).items():
            setattr(cmdinst, key, value)

        try:
            cmdinst.ensure_finalized()
        except DistutilsOptionError as err:
            parser.error(str(err))

        return cmdinst


def main():
    return CommandLineInterface().run(sys.argv)


def parse_mapping(fileobj, filename=None):
    """Parse an extraction method mapping from a file-like object.

    >>> buf = StringIO('''
    ... [extractors]
    ... custom = mypackage.module:myfunc
    ...
    ... # Python source files
    ... [python: **.py]
    ...
    ... # Genshi templates
    ... [genshi: **/templates/**.html]
    ... include_attrs =
    ... [genshi: **/templates/**.txt]
    ... template_class = genshi.template:TextTemplate
    ... encoding = latin-1
    ...
    ... # Some custom extractor
    ... [custom: **/custom/*.*]
    ... ''')

    >>> method_map, options_map = parse_mapping(buf)
    >>> len(method_map)
    4

    >>> method_map[0]
    ('**.py', 'python')
    >>> options_map['**.py']
    {}
    >>> method_map[1]
    ('**/templates/**.html', 'genshi')
    >>> options_map['**/templates/**.html']['include_attrs']
    ''
    >>> method_map[2]
    ('**/templates/**.txt', 'genshi')
    >>> options_map['**/templates/**.txt']['template_class']
    'genshi.template:TextTemplate'
    >>> options_map['**/templates/**.txt']['encoding']
    'latin-1'

    >>> method_map[3]
    ('**/custom/*.*', 'mypackage.module:myfunc')
    >>> options_map['**/custom/*.*']
    {}

    :param fileobj: a readable file-like object containing the configuration
                    text to parse
    :see: `extract_from_directory`
    """
    extractors = {}
    method_map = []
    options_map = {}

    parser = RawConfigParser()
    parser._sections = odict(parser._sections)  # We need ordered sections

    if PY2:
        parser.readfp(fileobj, filename)
    else:
        parser.read_file(fileobj, filename)

    for section in parser.sections():
        if section == 'extractors':
            extractors = dict(parser.items(section))
        else:
            method, pattern = [part.strip() for part in section.split(':', 1)]
            method_map.append((pattern, method))
            options_map[pattern] = dict(parser.items(section))

    if extractors:
        for idx, (pattern, method) in enumerate(method_map):
            if method in extractors:
                method = extractors[method]
            method_map[idx] = (pattern, method)

    return method_map, options_map


def parse_keywords(strings=[]):
    """Parse keywords specifications from the given list of strings.

    >>> kw = sorted(parse_keywords(['_', 'dgettext:2', 'dngettext:2,3', 'pgettext:1c,2']).items())
    >>> for keyword, indices in kw:
    ...     print((keyword, indices))
    ('_', None)
    ('dgettext', (2,))
    ('dngettext', (2, 3))
    ('pgettext', ((1, 'c'), 2))
    """
    keywords = {}
    for string in strings:
        if ':' in string:
            funcname, indices = string.split(':')
        else:
            funcname, indices = string, None
        if funcname not in keywords:
            if indices:
                inds = []
                for x in indices.split(','):
                    if x[-1] == 'c':
                        inds.append((int(x[:-1]), 'c'))
                    else:
                        inds.append(int(x))
                indices = tuple(inds)
            keywords[funcname] = indices
    return keywords


if __name__ == '__main__':
    main()
