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- Committer: Martin Pool
- Date: 2005-04-28 07:24:55 UTC
- Revision ID: mbp@sourcefrog.net-20050428072453-7b99afa993a1e549
todo
- files added:
- bzrlib/remotebranch.py
- files removed:
- HACKING
- bzrlib/plugins
- bzrlib/selftest
- bzrlib/store
- bzrlib/transport
- bzrlib/util
- bzrlib/util/effbot
- bzrlib/util/effbot/org
- contrib
- contrib/bash
- contrib/emacs
- contrib/zsh
- patches
- tools
- files renamed:
- contrib/newinventory.py => bzrlib/newinventory.py
- bzrlib/store/__init__.py => bzrlib/store.py
- bzrlib/util/elementtree/ => elementtree/
- bzrlib/util/urlgrabber/ => urlgrabber/
- files modified:
- .bzrignore
- bzr *
- setup.py *
added
removed
bzrlib/weave.py
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#! /usr/bin/python
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# Copyright (C) 2005 Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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# Author: Martin Pool <mbp@canonical.com>
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"""Weave - storage of related text file versions"""
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# XXX: If we do weaves this way, will a merge still behave the same
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# way if it's done in a different order? That's a pretty desirable
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# property.
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# TODO: Nothing here so far assumes the lines are really \n newlines,
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# rather than being split up in some other way. We could accomodate
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# binaries, perhaps by naively splitting on \n or perhaps using
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# something like a rolling checksum.
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# TODO: End marker for each version so we can stop reading?
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# TODO: Check that no insertion occurs inside a deletion that was
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# active in the version of the insertion.
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# TODO: In addition to the SHA-1 check, perhaps have some code that
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# checks structural constraints of the weave: ie that insertions are
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# properly nested, that there is no text outside of an insertion, that
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# insertions or deletions are not repeated, etc.
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# TODO: Parallel-extract that passes back each line along with a
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# description of which revisions include it. Nice for checking all
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# shas or calculating stats in parallel.
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# TODO: Using a single _extract routine and then processing the output
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# is probably inefficient. It's simple enough that we can afford to
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# have slight specializations for different ways its used: annotate,
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# basis for add, get, etc.
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# TODO: Probably the API should work only in names to hide the integer
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# indexes from the user.
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# TODO: Is there any potential performance win by having an add()
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# variant that is passed a pre-cooked version of the single basis
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# version?
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# TODO: Reweave can possibly be made faster by remembering diffs
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# where the basis and destination are unchanged.
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# FIXME: Sometimes we will be given a parents list for a revision
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# that includes some redundant parents (i.e. already a parent of
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# something in the list.) We should eliminate them. This can
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# be done fairly efficiently because the sequence numbers constrain
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# the possible relationships.
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import sha
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from difflib import SequenceMatcher
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from bzrlib.trace import mutter
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class WeaveError(Exception):
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"""Exception in processing weave"""
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class WeaveFormatError(WeaveError):
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"""Weave invariant violated"""
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class WeaveParentMismatch(WeaveError):
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"""Parents are mismatched between two revisions."""
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class Weave(object):
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"""weave - versioned text file storage.
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A Weave manages versions of line-based text files, keeping track
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of the originating version for each line.
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To clients the "lines" of the file are represented as a list of strings.
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These strings will typically have terminal newline characters, but
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this is not required. In particular files commonly do not have a newline
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at the end of the file.
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Texts can be identified in either of two ways:
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* a nonnegative index number.
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* a version-id string.
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Typically the index number will be valid only inside this weave and
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the version-id is used to reference it in the larger world.
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The weave is represented as a list mixing edit instructions and
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literal text. Each entry in _weave can be either a string (or
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unicode), or a tuple. If a string, it means that the given line
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should be output in the currently active revisions.
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If a tuple, it gives a processing instruction saying in which
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revisions the enclosed lines are active. The tuple has the form
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(instruction, version).
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The instruction can be '{' or '}' for an insertion block, and '['
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and ']' for a deletion block respectively. The version is the
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integer version index. There is no replace operator, only deletes
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and inserts. For '}', the end of an insertion, there is no
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version parameter because it always closes the most recently
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opened insertion.
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Constraints/notes:
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* A later version can delete lines that were introduced by any
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number of ancestor versions; this implies that deletion
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instructions can span insertion blocks without regard to the
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insertion block's nesting.
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* Similarly, deletions need not be properly nested with regard to
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each other, because they might have been generated by
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independent revisions.
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* Insertions are always made by inserting a new bracketed block
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into a single point in the previous weave. This implies they
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can nest but not overlap, and the nesting must always have later
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insertions on the inside.
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* It doesn't seem very useful to have an active insertion
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inside an inactive insertion, but it might happen.
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* Therefore, all instructions are always"considered"; that
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is passed onto and off the stack. An outer inactive block
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doesn't disable an inner block.
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* Lines are enabled if the most recent enclosing insertion is
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active and none of the enclosing deletions are active.
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* There is no point having a deletion directly inside its own
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insertion; you might as well just not write it. And there
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should be no way to get an earlier version deleting a later
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version.
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_weave
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Text of the weave; list of control instruction tuples and strings.
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_parents
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List of parents, indexed by version number.
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It is only necessary to store the minimal set of parents for
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each version; the parent's parents are implied.
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_sha1s
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List of hex SHA-1 of each version.
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_names
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List of symbolic names for each version. Each should be unique.
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_name_map
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For each name, the version number.
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_weave_name
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Descriptive name of this weave; typically the filename if known.
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Set by read_weave.
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"""
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__slots__ = ['_weave', '_parents', '_sha1s', '_names', '_name_map',
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'_weave_name']
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def __init__(self, weave_name=None):
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self._weave = []
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self._parents = []
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self._sha1s = []
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self._names = []
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self._name_map = {}
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self._weave_name = weave_name
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def copy(self):
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"""Return a deep copy of self.
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The copy can be modified without affecting the original weave."""
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other = Weave()
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other._weave = self._weave[:]
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other._parents = self._parents[:]
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other._sha1s = self._sha1s[:]
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other._names = self._names[:]
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other._name_map = self._name_map.copy()
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other._weave_name = self._weave_name
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return other
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def __eq__(self, other):
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if not isinstance(other, Weave):
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return False
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return self._parents == other._parents \
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and self._weave == other._weave \
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and self._sha1s == other._sha1s
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def __ne__(self, other):
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return not self.__eq__(other)
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def maybe_lookup(self, name_or_index):
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"""Convert possible symbolic name to index, or pass through indexes."""
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if isinstance(name_or_index, (int, long)):
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return name_or_index
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else:
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return self.lookup(name_or_index)
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def lookup(self, name):
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"""Convert symbolic version name to index."""
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try:
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return self._name_map[name]
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except KeyError:
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raise WeaveError("name %r not present in weave %r" %
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(name, self._weave_name))
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def iter_names(self):
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"""Yield a list of all names in this weave."""
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return iter(self._names)
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def idx_to_name(self, version):
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return self._names[version]
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def _check_repeated_add(self, name, parents, text, sha1):
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"""Check that a duplicated add is OK.
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If it is, return the (old) index; otherwise raise an exception.
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"""
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idx = self.lookup(name)
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if sorted(self._parents[idx]) != sorted(parents):
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raise WeaveError("name \"%s\" already present in weave "
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"with different parents" % name)
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if sha1 != self._sha1s[idx]:
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raise WeaveError("name \"%s\" already present in weave "
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"with different text" % name)
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return idx
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def add(self, name, parents, text, sha1=None):
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"""Add a single text on top of the weave.
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Returns the index number of the newly added version.
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name
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Symbolic name for this version.
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(Typically the revision-id of the revision that added it.)
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parents
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List or set of direct parent version numbers.
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text
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Sequence of lines to be added in the new version.
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sha -- SHA-1 of the file, if known. This is trusted to be
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correct if supplied.
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"""
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from bzrlib.osutils import sha_strings
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assert isinstance(name, basestring)
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if sha1 is None:
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sha1 = sha_strings(text)
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if name in self._name_map:
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return self._check_repeated_add(name, parents, text, sha1)
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parents = map(self.maybe_lookup, parents)
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self._check_versions(parents)
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## self._check_lines(text)
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new_version = len(self._parents)
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# if we abort after here the (in-memory) weave will be corrupt because only
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# some fields are updated
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self._parents.append(parents[:])
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self._sha1s.append(sha1)
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self._names.append(name)
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self._name_map[name] = new_version
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if not parents:
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# special case; adding with no parents revision; can do
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# this more quickly by just appending unconditionally.
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# even more specially, if we're adding an empty text we
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# need do nothing at all.
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if text:
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self._weave.append(('{', new_version))
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self._weave.extend(text)
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self._weave.append(('}', None))
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return new_version
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if len(parents) == 1:
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pv = list(parents)[0]
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if sha1 == self._sha1s[pv]:
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# special case: same as the single parent
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return new_version
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ancestors = self.inclusions(parents)
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l = self._weave
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# basis a list of (origin, lineno, line)
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basis_lineno = []
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basis_lines = []
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for origin, lineno, line in self._extract(ancestors):
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basis_lineno.append(lineno)
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basis_lines.append(line)
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# another small special case: a merge, producing the same text
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# as auto-merge
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if text == basis_lines:
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return new_version
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# add a sentinal, because we can also match against the final line
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basis_lineno.append(len(self._weave))
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# XXX: which line of the weave should we really consider
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# matches the end of the file? the current code says it's the
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# last line of the weave?
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#print 'basis_lines:', basis_lines
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#print 'new_lines: ', lines
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s = SequenceMatcher(None, basis_lines, text)
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# offset gives the number of lines that have been inserted
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# into the weave up to the current point; if the original edit instruction
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# says to change line A then we actually change (A+offset)
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offset = 0
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for tag, i1, i2, j1, j2 in s.get_opcodes():
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# i1,i2 are given in offsets within basis_lines; we need to map them
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# back to offsets within the entire weave
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#print 'raw match', tag, i1, i2, j1, j2
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if tag == 'equal':
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continue
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i1 = basis_lineno[i1]
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i2 = basis_lineno[i2]
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assert 0 <= j1 <= j2 <= len(text)
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#print tag, i1, i2, j1, j2
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# the deletion and insertion are handled separately.
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# first delete the region.
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if i1 != i2:
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self._weave.insert(i1+offset, ('[', new_version))
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self._weave.insert(i2+offset+1, (']', new_version))
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offset += 2
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if j1 != j2:
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# there may have been a deletion spanning up to
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# i2; we want to insert after this region to make sure
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# we don't destroy ourselves
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i = i2 + offset
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self._weave[i:i] = ([('{', new_version)]
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+ text[j1:j2]
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+ [('}', None)])
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offset += 2 + (j2 - j1)
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return new_version
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def add_identical(self, old_rev_id, new_rev_id, parents):
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"""Add an identical text to old_rev_id as new_rev_id."""
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old_lines = self.get(self.lookup(old_rev_id))
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self.add(new_rev_id, parents, old_lines)
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def inclusions(self, versions):
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"""Return set of all ancestors of given version(s)."""
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i = set(versions)
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for v in xrange(max(versions), 0, -1):
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if v in i:
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# include all its parents
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i.update(self._parents[v])
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return i
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## except IndexError:
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## raise ValueError("version %d not present in weave" % v)
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def parents(self, version):
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return self._parents[version]
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def parent_names(self, version):
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"""Return version names for parents of a version."""
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return map(self.idx_to_name, self._parents[self.lookup(version)])
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def minimal_parents(self, version):
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"""Find the minimal set of parents for the version."""
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included = self._parents[version]
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if not included:
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return []
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li = list(included)
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li.sort(reverse=True)
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mininc = []
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gotit = set()
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for pv in li:
419
if pv not in gotit:
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mininc.append(pv)
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gotit.update(self.inclusions(pv))
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assert mininc[0] >= 0
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assert mininc[-1] < version
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return mininc
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def _check_lines(self, text):
430
if not isinstance(text, list):
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raise ValueError("text should be a list, not %s" % type(text))
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for l in text:
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if not isinstance(l, basestring):
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raise ValueError("text line should be a string or unicode, not %s"
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% type(l))
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def _check_versions(self, indexes):
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"""Check everything in the sequence of indexes is valid"""
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for i in indexes:
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try:
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self._parents[i]
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except IndexError:
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raise IndexError("invalid version number %r" % i)
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def annotate(self, name_or_index):
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return list(self.annotate_iter(name_or_index))
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def annotate_iter(self, name_or_index):
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"""Yield list of (index-id, line) pairs for the specified version.
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The index indicates when the line originated in the weave."""
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incls = [self.maybe_lookup(name_or_index)]
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for origin, lineno, text in self._extract(incls):
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yield origin, text
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def _walk(self):
463
"""Walk the weave.
464
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Yields sequence of
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(lineno, insert, deletes, text)
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for each literal line.
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"""
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istack = []
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dset = set()
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lineno = 0 # line of weave, 0-based
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for l in self._weave:
476
if isinstance(l, tuple):
477
c, v = l
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isactive = None
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if c == '{':
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istack.append(v)
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elif c == '}':
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istack.pop()
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elif c == '[':
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assert v not in dset
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dset.add(v)
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elif c == ']':
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dset.remove(v)
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else:
489
raise WeaveFormatError('unexpected instruction %r'
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% v)
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else:
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assert isinstance(l, basestring)
493
assert istack
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yield lineno, istack[-1], dset, l
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lineno += 1
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def _extract(self, versions):
500
"""Yield annotation of lines in included set.
501
502
Yields a sequence of tuples (origin, lineno, text), where
503
origin is the origin version, lineno the index in the weave,
504
and text the text of the line.
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The set typically but not necessarily corresponds to a version.
507
"""
508
for i in versions:
509
if not isinstance(i, int):
510
raise ValueError(i)
511
512
included = self.inclusions(versions)
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514
istack = []
515
dset = set()
516
517
lineno = 0 # line of weave, 0-based
518
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isactive = None
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result = []
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WFE = WeaveFormatError
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for l in self._weave:
526
if isinstance(l, tuple):
527
c, v = l
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isactive = None
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if c == '{':
530
assert v not in istack
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istack.append(v)
532
elif c == '}':
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istack.pop()
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elif c == '[':
535
if v in included:
536
assert v not in dset
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dset.add(v)
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else:
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assert c == ']'
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if v in included:
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assert v in dset
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dset.remove(v)
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else:
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assert isinstance(l, basestring)
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if isactive is None:
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isactive = (not dset) and istack and (istack[-1] in included)
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if isactive:
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result.append((istack[-1], lineno, l))
549
lineno += 1
550
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if istack:
552
raise WFE("unclosed insertion blocks at end of weave",
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istack)
554
if dset:
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raise WFE("unclosed deletion blocks at end of weave",
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dset)
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return result
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def get_iter(self, name_or_index):
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"""Yield lines for the specified version."""
564
incls = [self.maybe_lookup(name_or_index)]
565
for origin, lineno, line in self._extract(incls):
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yield line
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def get_text(self, name_or_index):
570
return ''.join(self.get_iter(name_or_index))
571
assert isinstance(version, int)
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573
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def get_lines(self, name_or_index):
575
return list(self.get_iter(name_or_index))
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get = get_lines
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def mash_iter(self, included):
582
"""Return composed version of multiple included versions."""
583
included = map(self.maybe_lookup, included)
584
for origin, lineno, text in self._extract(included):
585
yield text
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def dump(self, to_file):
589
from pprint import pprint
590
print >>to_file, "Weave._weave = ",
591
pprint(self._weave, to_file)
592
print >>to_file, "Weave._parents = ",
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pprint(self._parents, to_file)
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def numversions(self):
598
l = len(self._parents)
599
assert l == len(self._sha1s)
600
return l
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def __len__(self):
604
return self.numversions()
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def check(self, progress_bar=None):
608
# check no circular inclusions
609
for version in range(self.numversions()):
610
inclusions = list(self._parents[version])
611
if inclusions:
612
inclusions.sort()
613
if inclusions[-1] >= version:
614
raise WeaveFormatError("invalid included version %d for index %d"
615
% (inclusions[-1], version))
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# try extracting all versions; this is a bit slow and parallel
618
# extraction could be used
619
nv = self.numversions()
620
for version in range(nv):
621
if progress_bar:
622
progress_bar.update('checking text', version, nv)
623
s = sha.new()
624
for l in self.get_iter(version):
625
s.update(l)
626
hd = s.hexdigest()
627
expected = self._sha1s[version]
628
if hd != expected:
629
raise WeaveError("mismatched sha1 for version %d; "
630
"got %s, expected %s"
631
% (version, hd, expected))
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# TODO: check insertions are properly nested, that there are
634
# no lines outside of insertion blocks, that deletions are
635
# properly paired, etc.
636
637
638
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def merge(self, merge_versions):
640
"""Automerge and mark conflicts between versions.
641
642
This returns a sequence, each entry describing alternatives
643
for a chunk of the file. Each of the alternatives is given as
644
a list of lines.
645
646
If there is a chunk of the file where there's no diagreement,
647
only one alternative is given.
648
"""
649
# approach: find the included versions common to all the
650
# merged versions
651
raise NotImplementedError()
652
653
654
655
def _delta(self, included, lines):
656
"""Return changes from basis to new revision.
657
658
The old text for comparison is the union of included revisions.
659
660
This is used in inserting a new text.
661
662
Delta is returned as a sequence of
663
(weave1, weave2, newlines).
664
665
This indicates that weave1:weave2 of the old weave should be
666
replaced by the sequence of lines in newlines. Note that
667
these line numbers are positions in the total weave and don't
668
correspond to the lines in any extracted version, or even the
669
extracted union of included versions.
670
671
If line1=line2, this is a pure insert; if newlines=[] this is a
672
pure delete. (Similar to difflib.)
673
"""
674
raise NotImplementedError()
675
676
677
def plan_merge(self, ver_a, ver_b):
678
"""Return pseudo-annotation indicating how the two versions merge.
679
680
This is computed between versions a and b and their common
681
base.
682
683
Weave lines present in none of them are skipped entirely.
684
"""
685
inc_a = self.inclusions([ver_a])
686
inc_b = self.inclusions([ver_b])
687
inc_c = inc_a & inc_b
688
689
for lineno, insert, deleteset, line in self._walk():
690
if deleteset & inc_c:
691
# killed in parent; can't be in either a or b
692
# not relevant to our work
693
yield 'killed-base', line
694
elif insert in inc_c:
695
# was inserted in base
696
killed_a = bool(deleteset & inc_a)
697
killed_b = bool(deleteset & inc_b)
698
if killed_a and killed_b:
699
yield 'killed-both', line
700
elif killed_a:
701
yield 'killed-a', line
702
elif killed_b:
703
yield 'killed-b', line
704
else:
705
yield 'unchanged', line
706
elif insert in inc_a:
707
if deleteset & inc_a:
708
yield 'ghost-a', line
709
else:
710
# new in A; not in B
711
yield 'new-a', line
712
elif insert in inc_b:
713
if deleteset & inc_b:
714
yield 'ghost-b', line
715
else:
716
yield 'new-b', line
717
else:
718
# not in either revision
719
yield 'irrelevant', line
720
721
yield 'unchanged', '' # terminator
722
723
724
725
def weave_merge(self, plan):
726
lines_a = []
727
lines_b = []
728
ch_a = ch_b = False
729
730
for state, line in plan:
731
if state == 'unchanged' or state == 'killed-both':
732
# resync and flush queued conflicts changes if any
733
if not lines_a and not lines_b:
734
pass
735
elif ch_a and not ch_b:
736
# one-sided change:
737
for l in lines_a: yield l
738
elif ch_b and not ch_a:
739
for l in lines_b: yield l
740
elif lines_a == lines_b:
741
for l in lines_a: yield l
742
else:
743
yield '<<<<\n'
744
for l in lines_a: yield l
745
yield '====\n'
746
for l in lines_b: yield l
747
yield '>>>>\n'
748
749
del lines_a[:]
750
del lines_b[:]
751
ch_a = ch_b = False
752
753
if state == 'unchanged':
754
if line:
755
yield line
756
elif state == 'killed-a':
757
ch_a = True
758
lines_b.append(line)
759
elif state == 'killed-b':
760
ch_b = True
761
lines_a.append(line)
762
elif state == 'new-a':
763
ch_a = True
764
lines_a.append(line)
765
elif state == 'new-b':
766
ch_b = True
767
lines_b.append(line)
768
else:
769
assert state in ('irrelevant', 'ghost-a', 'ghost-b', 'killed-base',
770
'killed-both'), \
771
state
772
773
774
def join(self, other):
775
"""Integrate versions from other into this weave.
776
777
The resulting weave contains all the history of both weaves;
778
any version you could retrieve from either self or other can be
779
retrieved from self after this call.
780
781
It is illegal for the two weaves to contain different values
782
or different parents for any version. See also reweave().
783
"""
784
if other.numversions() == 0:
785
return # nothing to update, easy
786
# two loops so that we do not change ourselves before verifying it
787
# will be ok
788
# work through in index order to make sure we get all dependencies
789
for other_idx, name in enumerate(other._names):
790
if self._check_version_consistent(other, other_idx, name):
791
continue
792
for other_idx, name in enumerate(other._names):
793
# TODO: If all the parents of the other version are already
794
# present then we can avoid some work by just taking the delta
795
# and adjusting the offsets.
796
new_parents = self._imported_parents(other, other_idx)
797
lines = other.get_lines(other_idx)
798
sha1 = other._sha1s[other_idx]
799
self.add(name, new_parents, lines, sha1)
800
801
802
def _imported_parents(self, other, other_idx):
803
"""Return list of parents in self corresponding to indexes in other."""
804
new_parents = []
805
for parent_idx in other._parents[other_idx]:
806
parent_name = other._names[parent_idx]
807
if parent_name not in self._names:
808
# should not be possible
809
raise WeaveError("missing parent {%s} of {%s} in %r"
810
% (parent_name, other._name_map[other_idx], self))
811
new_parents.append(self._name_map[parent_name])
812
return new_parents
813
814
def _check_version_consistent(self, other, other_idx, name):
815
"""Check if a version in consistent in this and other.
816
817
To be consistent it must have:
818
819
* the same text
820
* the same direct parents (by name, not index, and disregarding
821
order)
822
823
If present & correct return True;
824
if not present in self return False;
825
if inconsistent raise error."""
826
this_idx = self._name_map.get(name, -1)
827
if this_idx != -1:
828
if self._sha1s[this_idx] != other._sha1s[other_idx]:
829
raise WeaveError("inconsistent texts for version {%s} "
830
"when joining weaves"
831
% (name))
832
self_parents = self._parents[this_idx]
833
other_parents = other._parents[other_idx]
834
n1 = [self._names[i] for i in self_parents]
835
n2 = [other._names[i] for i in other_parents]
836
n1.sort()
837
n2.sort()
838
if n1 != n2:
839
raise WeaveParentMismatch("inconsistent parents "
840
"for version {%s}: %s vs %s" % (name, n1, n2))
841
else:
842
return True # ok!
843
else:
844
return False
845
846
def reweave(self, other):
847
"""Reweave self with other."""
848
new_weave = reweave(self, other)
849
for attr in self.__slots__:
850
setattr(self, attr, getattr(new_weave, attr))
851
852
853
def reweave(wa, wb):
854
"""Combine two weaves and return the result.
855
856
This works even if a revision R has different parents in
857
wa and wb. In the resulting weave all the parents are given.
858
859
This is done by just building up a new weave, maintaining ordering
860
of the versions in the two inputs. More efficient approaches
861
might be possible but it should only be necessary to do
862
this operation rarely, when a new previously ghost version is
863
inserted.
864
"""
865
wr = Weave()
866
ia = ib = 0
867
queue_a = range(wa.numversions())
868
queue_b = range(wb.numversions())
869
# first determine combined parents of all versions
870
# map from version name -> all parent names
871
combined_parents = _reweave_parent_graphs(wa, wb)
872
mutter("combined parents: %r", combined_parents)
873
order = _make_reweave_order(wa._names, wb._names, combined_parents)
874
mutter("order to reweave: %r", order)
875
for name in order:
876
if name in wa._name_map:
877
lines = wa.get_lines(name)
878
if name in wb._name_map:
879
assert lines == wb.get_lines(name)
880
else:
881
lines = wb.get_lines(name)
882
wr.add(name, combined_parents[name], lines)
883
return wr
884
885
886
def _reweave_parent_graphs(wa, wb):
887
"""Return combined parent ancestry for two weaves.
888
889
Returned as a list of (version_name, set(parent_names))"""
890
combined = {}
891
for weave in [wa, wb]:
892
for idx, name in enumerate(weave._names):
893
p = combined.setdefault(name, set())
894
p.update(map(weave.idx_to_name, weave._parents[idx]))
895
return combined
896
897
898
def _make_reweave_order(wa_order, wb_order, combined_parents):
899
"""Return an order to reweave versions respecting parents."""
900
done = set()
901
result = []
902
ia = ib = 0
903
next_a = next_b = None
904
len_a = len(wa_order)
905
len_b = len(wb_order)
906
while ia < len(wa_order) or ib < len(wb_order):
907
if ia < len_a:
908
next_a = wa_order[ia]
909
if next_a in done:
910
ia += 1
911
continue
912
if combined_parents[next_a].issubset(done):
913
ia += 1
914
result.append(next_a)
915
done.add(next_a)
916
continue
917
if ib < len_b:
918
next_b = wb_order[ib]
919
if next_b in done:
920
ib += 1
921
continue
922
elif combined_parents[next_b].issubset(done):
923
ib += 1
924
result.append(next_b)
925
done.add(next_b)
926
continue
927
raise WeaveError("don't know how to reweave at {%s} and {%s}"
928
% (next_a, next_b))
929
return result
930
931
932
def weave_toc(w):
933
"""Show the weave's table-of-contents"""
934
print '%6s %50s %10s %10s' % ('ver', 'name', 'sha1', 'parents')
935
for i in (6, 50, 10, 10):
936
print '-' * i,
937
print
938
for i in range(w.numversions()):
939
sha1 = w._sha1s[i]
940
name = w._names[i]
941
parent_str = ' '.join(map(str, w._parents[i]))
942
print '%6d %-50.50s %10.10s %s' % (i, name, sha1, parent_str)
943
944
945
946
def weave_stats(weave_file, pb):
947
from bzrlib.weavefile import read_weave
948
949
wf = file(weave_file, 'rb')
950
w = read_weave(wf)
951
# FIXME: doesn't work on pipes
952
weave_size = wf.tell()
953
954
total = 0
955
vers = len(w)
956
for i in range(vers):
957
pb.update('checking sizes', i, vers)
958
for origin, lineno, line in w._extract([i]):
959
total += len(line)
960
961
pb.clear()
962
963
print 'versions %9d' % vers
964
print 'weave file %9d bytes' % weave_size
965
print 'total contents %9d bytes' % total
966
print 'compression ratio %9.2fx' % (float(total) / float(weave_size))
967
if vers:
968
avg = total/vers
969
print 'average size %9d bytes' % avg
970
print 'relative size %9.2fx' % (float(weave_size) / float(avg))
971
972
973
def usage():
974
print """bzr weave tool
975
976
Experimental tool for weave algorithm.
977
978
usage:
979
weave init WEAVEFILE
980
Create an empty weave file
981
weave get WEAVEFILE VERSION
982
Write out specified version.
983
weave check WEAVEFILE
984
Check consistency of all versions.
985
weave toc WEAVEFILE
986
Display table of contents.
987
weave add WEAVEFILE NAME [BASE...] < NEWTEXT
988
Add NEWTEXT, with specified parent versions.
989
weave annotate WEAVEFILE VERSION
990
Display origin of each line.
991
weave mash WEAVEFILE VERSION...
992
Display composite of all selected versions.
993
weave merge WEAVEFILE VERSION1 VERSION2 > OUT
994
Auto-merge two versions and display conflicts.
995
weave diff WEAVEFILE VERSION1 VERSION2
996
Show differences between two versions.
997
998
example:
999
1000
% weave init foo.weave
1001
% vi foo.txt
1002
% weave add foo.weave ver0 < foo.txt
1003
added version 0
1004
1005
(create updated version)
1006
% vi foo.txt
1007
% weave get foo.weave 0 | diff -u - foo.txt
1008
% weave add foo.weave ver1 0 < foo.txt
1009
added version 1
1010
1011
% weave get foo.weave 0 > foo.txt (create forked version)
1012
% vi foo.txt
1013
% weave add foo.weave ver2 0 < foo.txt
1014
added version 2
1015
1016
% weave merge foo.weave 1 2 > foo.txt (merge them)
1017
% vi foo.txt (resolve conflicts)
1018
% weave add foo.weave merged 1 2 < foo.txt (commit merged version)
1019
1020
"""
1021
1022
1023
1024
def main(argv):
1025
import sys
1026
import os
1027
try:
1028
import bzrlib
1029
except ImportError:
1030
# in case we're run directly from the subdirectory
1031
sys.path.append('..')
1032
import bzrlib
1033
from bzrlib.weavefile import write_weave, read_weave
1034
from bzrlib.progress import ProgressBar
1035
1036
try:
1037
import psyco
1038
psyco.full()
1039
except ImportError:
1040
pass
1041
1042
if len(argv) < 2:
1043
usage()
1044
return 0
1045
1046
cmd = argv[1]
1047
1048
def readit():
1049
return read_weave(file(argv[2], 'rb'))
1050
1051
if cmd == 'help':
1052
usage()
1053
elif cmd == 'add':
1054
w = readit()
1055
# at the moment, based on everything in the file
1056
name = argv[3]
1057
parents = map(int, argv[4:])
1058
lines = sys.stdin.readlines()
1059
ver = w.add(name, parents, lines)
1060
write_weave(w, file(argv[2], 'wb'))
1061
print 'added version %r %d' % (name, ver)
1062
elif cmd == 'init':
1063
fn = argv[2]
1064
if os.path.exists(fn):
1065
raise IOError("file exists")
1066
w = Weave()
1067
write_weave(w, file(fn, 'wb'))
1068
elif cmd == 'get': # get one version
1069
w = readit()
1070
sys.stdout.writelines(w.get_iter(int(argv[3])))
1071
1072
elif cmd == 'mash': # get composite
1073
w = readit()
1074
sys.stdout.writelines(w.mash_iter(map(int, argv[3:])))
1075
1076
elif cmd == 'diff':
1077
from difflib import unified_diff
1078
w = readit()
1079
fn = argv[2]
1080
v1, v2 = map(int, argv[3:5])
1081
lines1 = w.get(v1)
1082
lines2 = w.get(v2)
1083
diff_gen = unified_diff(lines1, lines2,
1084
'%s version %d' % (fn, v1),
1085
'%s version %d' % (fn, v2))
1086
sys.stdout.writelines(diff_gen)
1087
1088
elif cmd == 'annotate':
1089
w = readit()
1090
# newline is added to all lines regardless; too hard to get
1091
# reasonable formatting otherwise
1092
lasto = None
1093
for origin, text in w.annotate(int(argv[3])):
1094
text = text.rstrip('\r\n')
1095
if origin == lasto:
1096
print ' | %s' % (text)
1097
else:
1098
print '%5d | %s' % (origin, text)
1099
lasto = origin
1100
1101
elif cmd == 'toc':
1102
weave_toc(readit())
1103
1104
elif cmd == 'stats':
1105
weave_stats(argv[2], ProgressBar())
1106
1107
elif cmd == 'check':
1108
w = readit()
1109
pb = ProgressBar()
1110
w.check(pb)
1111
pb.clear()
1112
print '%d versions ok' % w.numversions()
1113
1114
elif cmd == 'inclusions':
1115
w = readit()
1116
print ' '.join(map(str, w.inclusions([int(argv[3])])))
1117
1118
elif cmd == 'parents':
1119
w = readit()
1120
print ' '.join(map(str, w._parents[int(argv[3])]))
1121
1122
elif cmd == 'plan-merge':
1123
w = readit()
1124
for state, line in w.plan_merge(int(argv[3]), int(argv[4])):
1125
if line:
1126
print '%14s | %s' % (state, line),
1127
1128
elif cmd == 'merge':
1129
w = readit()
1130
p = w.plan_merge(int(argv[3]), int(argv[4]))
1131
sys.stdout.writelines(w.weave_merge(p))
1132
1133
elif cmd == 'mash-merge':
1134
if len(argv) != 5:
1135
usage()
1136
return 1
1137
1138
w = readit()
1139
v1, v2 = map(int, argv[3:5])
1140
1141
basis = w.inclusions([v1]).intersection(w.inclusions([v2]))
1142
1143
base_lines = list(w.mash_iter(basis))
1144
a_lines = list(w.get(v1))
1145
b_lines = list(w.get(v2))
1146
1147
from bzrlib.merge3 import Merge3
1148
m3 = Merge3(base_lines, a_lines, b_lines)
1149
1150
name_a = 'version %d' % v1
1151
name_b = 'version %d' % v2
1152
sys.stdout.writelines(m3.merge_lines(name_a=name_a, name_b=name_b))
1153
else:
1154
raise ValueError('unknown command %r' % cmd)
1155
1156
1157
1158
def profile_main(argv):
1159
import tempfile, hotshot, hotshot.stats
1160
1161
prof_f = tempfile.NamedTemporaryFile()
1162
1163
prof = hotshot.Profile(prof_f.name)
1164
1165
ret = prof.runcall(main, argv)
1166
prof.close()
1167
1168
stats = hotshot.stats.load(prof_f.name)
1169
#stats.strip_dirs()
1170
stats.sort_stats('cumulative')
1171
## XXX: Might like to write to stderr or the trace file instead but
1172
## print_stats seems hardcoded to stdout
1173
stats.print_stats(20)
1174
1175
return ret
1176
1177
1178
if __name__ == '__main__':
1179
import sys
1180
if '--profile' in sys.argv:
1181
args = sys.argv[:]
1182
args.remove('--profile')
1183
sys.exit(profile_main(args))
1184
else:
1185
sys.exit(main(sys.argv))
1186
Loggerhead is a web-based interface for Breezy
Version: 2.0.1