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//opt/alt/python27/lib/python2.7/site-packages/alembic/config.py

from argparse import ArgumentParser
from .util.compat import SafeConfigParser
import inspect
import os
import sys

from . import command
from . import util
from . import package_dir
from .util import compat

class Config(object):

"""Represent an Alembic configuration.

Within an ``env.py`` script, this is available
    via the :attr:`.EnvironmentContext.config` attribute,
    which in turn is available at ``alembic.context``::

from alembic import context

some_param = context.config.get_main_option("my option")

When invoking Alembic programatically, a new
    :class:`.Config` can be created by passing
    the name of an .ini file to the constructor::

from alembic.config import Config
        alembic_cfg = Config("/path/to/yourapp/alembic.ini")

With a :class:`.Config` object, you can then
    run Alembic commands programmatically using the directives
    in :mod:`alembic.command`.

The :class:`.Config` object can also be constructed without
    a filename.   Values can be set programmatically, and
    new sections will be created as needed::

from alembic.config import Config
        alembic_cfg = Config()
        alembic_cfg.set_main_option("script_location", "myapp:migrations")
        alembic_cfg.set_main_option("url", "postgresql://foo/bar")
        alembic_cfg.set_section_option("mysection", "foo", "bar")

For passing non-string values to environments, such as connections and
    engines, use the :attr:`.Config.attributes` dictionary::

with engine.begin() as connection:
            alembic_cfg.attributes['connection'] = connection
            command.upgrade(alembic_cfg, "head")

:param file_: name of the .ini file to open.
    :param ini_section: name of the main Alembic section within the
     .ini file
    :param output_buffer: optional file-like input buffer which
     will be passed to the :class:`.MigrationContext` - used to redirect
     the output of "offline generation" when using Alembic programmatically.
    :param stdout: buffer where the "print" output of commands will be sent.
     Defaults to ``sys.stdout``.

.. versionadded:: 0.4

:param config_args: A dictionary of keys and values that will be used
     for substitution in the alembic config file.  The dictionary as given
     is **copied** to a new one, stored locally as the attribute
     ``.config_args``. When the :attr:`.Config.file_config` attribute is
     first invoked, the replacement variable ``here`` will be added to this
     dictionary before the dictionary is passed to ``SafeConfigParser()``
     to parse the .ini file.

.. versionadded:: 0.7.0

:param attributes: optional dictionary of arbitrary Python keys/values,
     which will be populated into the :attr:`.Config.attributes` dictionary.

.. versionadded:: 0.7.5

.. seealso::

:ref:`connection_sharing`

"""

def __init__(self, file_=None, ini_section='alembic', output_buffer=None,
                 stdout=sys.stdout, cmd_opts=None,
                 config_args=util.immutabledict(), attributes=None):
        """Construct a new :class:`.Config`

"""
        self.config_file_name = file_
        self.config_ini_section = ini_section
        self.output_buffer = output_buffer
        self.stdout = stdout
        self.cmd_opts = cmd_opts
        self.config_args = dict(config_args)
        if attributes:
            self.attributes.update(attributes)

cmd_opts = None
    """The command-line options passed to the ``alembic`` script.

Within an ``env.py`` script this can be accessed via the
    :attr:`.EnvironmentContext.config` attribute.

.. versionadded:: 0.6.0

.. seealso::

:meth:`.EnvironmentContext.get_x_argument`

"""

config_file_name = None
    """Filesystem path to the .ini file in use."""

config_ini_section = None
    """Name of the config file section to read basic configuration
    from.  Defaults to ``alembic``, that is the ``[alembic]`` section
    of the .ini file.  This value is modified using the ``-n/--name``
    option to the Alembic runnier.

"""

@util.memoized_property
    def attributes(self):
        """A Python dictionary for storage of additional state.

This is a utility dictionary which can include not just strings but
        engines, connections, schema objects, or anything else.
        Use this to pass objects into an env.py script, such as passing
        a :class:`sqlalchemy.engine.base.Connection` when calling
        commands from :mod:`alembic.command` programmatically.

.. versionadded:: 0.7.5

.. seealso::

:ref:`connection_sharing`

:paramref:`.Config.attributes`

"""
        return {}

def print_stdout(self, text, *arg):
        """Render a message to standard out."""

util.write_outstream(
            self.stdout,
            (compat.text_type(text) % arg),
            "\n"
        )

@util.memoized_property
    def file_config(self):
        """Return the underlying ``ConfigParser`` object.

Direct access to the .ini file is available here,
        though the :meth:`.Config.get_section` and
        :meth:`.Config.get_main_option`
        methods provide a possibly simpler interface.

"""

if self.config_file_name:
            here = os.path.abspath(os.path.dirname(self.config_file_name))
        else:
            here = ""
        self.config_args['here'] = here
        file_config = SafeConfigParser(self.config_args)
        if self.config_file_name:
            file_config.read([self.config_file_name])
        else:
            file_config.add_section(self.config_ini_section)
        return file_config

def get_template_directory(self):
        """Return the directory where Alembic setup templates are found.

This method is used by the alembic ``init`` and ``list_templates``
        commands.

"""
        return os.path.join(package_dir, 'templates')

def get_section(self, name):
        """Return all the configuration options from a given .ini file section
        as a dictionary.

"""
        return dict(self.file_config.items(name))

def set_main_option(self, name, value):
        """Set an option programmatically within the 'main' section.

This overrides whatever was in the .ini file.

"""
        self.file_config.set(self.config_ini_section, name, value)

def remove_main_option(self, name):
        self.file_config.remove_option(self.config_ini_section, name)

def set_section_option(self, section, name, value):
        """Set an option programmatically within the given section.

The section is created if it doesn't exist already.
        The value here will override whatever was in the .ini
        file.

"""
        if not self.file_config.has_section(section):
            self.file_config.add_section(section)
        self.file_config.set(section, name, value)

def get_section_option(self, section, name, default=None):
        """Return an option from the given section of the .ini file.

"""
        if not self.file_config.has_section(section):
            raise util.CommandError("No config file %r found, or file has no "
                                    "'[%s]' section" %
                                    (self.config_file_name, section))
        if self.file_config.has_option(section, name):
            return self.file_config.get(section, name)
        else:
            return default

def get_main_option(self, name, default=None):
        """Return an option from the 'main' section of the .ini file.

This defaults to being a key from the ``[alembic]``
        section, unless the ``-n/--name`` flag were used to
        indicate a different section.

"""
        return self.get_section_option(self.config_ini_section, name, default)

class CommandLine(object):

def __init__(self, prog=None):
        self._generate_args(prog)

def _generate_args(self, prog):
        def add_options(parser, positional, kwargs):
            kwargs_opts = {
                'template': (
                    "-t", "--template",
                    dict(
                        default='generic',
                        type=str,
                        help="Setup template for use with 'init'"
                    )
                ),
                'message': (
                    "-m", "--message",
                    dict(
                        type=str,
                        help="Message string to use with 'revision'")
                ),
                'sql': (
                    "--sql",
                    dict(
                        action="store_true",
                        help="Don't emit SQL to database - dump to "
                        "standard output/file instead"
                    )
                ),
                'tag': (
                    "--tag",
                    dict(
                        type=str,
                        help="Arbitrary 'tag' name - can be used by "
                        "custom env.py scripts.")
                ),
                'head': (
                    "--head",
                    dict(
                        type=str,
                        help="Specify head revision or <branchname>@head "
                        "to base new revision on."
                    )
                ),
                'splice': (
                    "--splice",
                    dict(
                        action="store_true",
                        help="Allow a non-head revision as the "
                        "'head' to splice onto"
                    )
                ),
                'depends_on': (
                    "--depends-on",
                    dict(
                        action="append",
                        help="Specify one or more revision identifiers "
                        "which this revision should depend on."
                    )
                ),
                'rev_id': (
                    "--rev-id",
                    dict(
                        type=str,
                        help="Specify a hardcoded revision id instead of "
                        "generating one"
                    )
                ),
                'version_path': (
                    "--version-path",
                    dict(
                        type=str,
                        help="Specify specific path from config for "
                        "version file"
                    )
                ),
                'branch_label': (
                    "--branch-label",
                    dict(
                        type=str,
                        help="Specify a branch label to apply to the "
                        "new revision"
                    )
                ),
                'verbose': (
                    "-v", "--verbose",
                    dict(
                        action="store_true",
                        help="Use more verbose output"
                    )
                ),
                'resolve_dependencies': (
                    '--resolve-dependencies',
                    dict(
                        action="store_true",
                        help="Treat dependency versions as down revisions"
                    )
                ),
                'autogenerate': (
                    "--autogenerate",
                    dict(
                        action="store_true",
                        help="Populate revision script with candidate "
                        "migration operations, based on comparison "
                        "of database to model.")
                ),
                'head_only': (
                    "--head-only",
                    dict(
                        action="store_true",
                        help="Deprecated.  Use --verbose for "
                        "additional output")
                ),
                'rev_range': (
                    "-r", "--rev-range",
                    dict(
                        action="store",
                        help="Specify a revision range; "
                        "format is [start]:[end]")
                )
            }
            positional_help = {
                'directory': "location of scripts directory",
                'revision': "revision identifier",
                'revisions': "one or more revisions, or 'heads' for all heads"

}
            for arg in kwargs:
                if arg in kwargs_opts:
                    args = kwargs_opts[arg]
                    args, kw = args[0:-1], args[-1]
                    parser.add_argument(*args, **kw)

for arg in positional:
                if arg == "revisions":
                    subparser.add_argument(
                        arg, nargs='+', help=positional_help.get(arg))
                else:
                    subparser.add_argument(arg, help=positional_help.get(arg))

parser = ArgumentParser(prog=prog)
        parser.add_argument("-c", "--config",
                            type=str,
                            default="alembic.ini",
                            help="Alternate config file")
        parser.add_argument("-n", "--name",
                            type=str,
                            default="alembic",
                            help="Name of section in .ini file to "
                                    "use for Alembic config")
        parser.add_argument("-x", action="append",
                            help="Additional arguments consumed by "
                            "custom env.py scripts, e.g. -x "
                            "setting1=somesetting -x setting2=somesetting")
        parser.add_argument("--raiseerr", action="store_true",
                            help="Raise a full stack trace on error")
        subparsers = parser.add_subparsers()

for fn in [getattr(command, n) for n in dir(command)]:
            if inspect.isfunction(fn) and \
                    fn.__name__[0] != '_' and \
                    fn.__module__ == 'alembic.command':

spec = inspect.getargspec(fn)
                if spec[3]:
                    positional = spec[0][1:-len(spec[3])]
                    kwarg = spec[0][-len(spec[3]):]
                else:
                    positional = spec[0][1:]
                    kwarg = []

subparser = subparsers.add_parser(
                    fn.__name__,
                    help=fn.__doc__)
                add_options(subparser, positional, kwarg)
                subparser.set_defaults(cmd=(fn, positional, kwarg))
        self.parser = parser

def run_cmd(self, config, options):
        fn, positional, kwarg = options.cmd

try:
            fn(config,
               *[getattr(options, k) for k in positional],
               **dict((k, getattr(options, k)) for k in kwarg)
               )
        except util.CommandError as e:
            if options.raiseerr:
                raise
            else:
                util.err(str(e))

def main(self, argv=None):
        options = self.parser.parse_args(argv)
        if not hasattr(options, "cmd"):
            # see http://bugs.python.org/issue9253, argparse
            # behavior changed incompatibly in py3.3
            self.parser.error("too few arguments")
        else:
            cfg = Config(file_=options.config,
                         ini_section=options.name, cmd_opts=options)
            self.run_cmd(cfg, options)

def main(argv=None, prog=None, **kwargs):
    """The console runner function for Alembic."""

CommandLine(prog=prog).main(argv=argv)

if __name__ == '__main__':
    main()