File: //opt/alt/python37/lib/python3.7/site-packages/alembic/script/__pycache__/base.cpython-37.opt-1.pyc
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This object is useful to get information as to current revisions,
most notably being able to get at the "head" revision, for schemes
that want to test if the current revision in the database is the most
recent::
from alembic.script import ScriptDirectory
from alembic.config import Config
config = Config()
config.set_main_option("script_location", "myapp:migrations")
script = ScriptDirectory.from_config(config)
head_revision = script.get_current_head()
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�|d �S ) z�Produce a new :class:`.ScriptDirectory` given a :class:`.Config`
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�rH } zt�t�| jd �� W d d } ~ X Y nX d S )NzgRequested range %(start)s:%(end)s does not refer to ancestor/descendant revisions along the same branch)�start�endz�Multiple head revisions are present for given argument '%(head_arg)s'; please specify a specific target revision, '<branchname>@%(head_arg)s' to narrow to a specific head, or 'heads' for all heads)Zhead_arg�headsz(Can't locate revision identified by '%s'r )r ZRangeNotAncestorError�lower�upperr Zraise_from_causer r Z
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:param base: the base revision, or "base" to start from the
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:param head: the head revision; defaults to "heads" to indicate
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head revision.
.. versionchanged:: 0.7.0 the "head" identifier now refers to
the head of a non-branched repository only; use "heads" to
refer to the set of all head branches simultaneously.
)r4 r5 TF)Z inclusiveZassert_relative_lengthN)r? r �iterate_revisions)r r@ �head�revr r r �walk_revisions� s z ScriptDirectory.walk_revisionsc C s | � � � | j�|�S Q R X dS )z�Return the :class:`.Script` instance with the given rev identifier,
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z ScriptDirectory.get_revisionsc C s | � � � | j�|�S Q R X dS )z�Return the :class:`.Script` instance with the given rev id.
.. seealso::
:meth:`.ScriptDirectory.get_revisions`
N)r? r � get_revision)r rF r r r rG � s
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The iterator yields :class:`.Script` objects.
.. seealso::
:meth:`.RevisionMap.iterate_revisions`
)r rA )r r8 r7 r r r rA � s z!ScriptDirectory.iterate_revisionsc C s" | j dd�� | j�� S Q R X dS )aG Return the current head revision.
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:meth:`.ScriptDirectory.get_heads` should be
preferred.
:return: a string revision number.
.. seealso::
:meth:`.ScriptDirectory.get_heads`
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.. versionadded:: 0.7.0
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:param message: the revision message, the one passed
by the -m argument to the ``revision`` command.
:param head: the head revision to generate against. Defaults
to the current "head" if no branches are present, else raises
an exception.
.. versionadded:: 0.7.0
:param splice: if True, allow the "head" version to not be an
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