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- Committer: Martin Pool
- Date: 2005-05-20 02:16:01 UTC
- Revision ID: mbp@sourcefrog.net-20050520021601-d931cce5b66227a3
- bzr diff finds a branch from the first parameter,
if any are given
if any are given
- files added:
- bzrlib/statcache.py
- files removed:
- HACKING
- bzrlib/plugins
- bzrlib/selftest
- bzrlib/util
- bzrlib/util/effbot
- bzrlib/util/effbot/org
- contrib/emacs
- tools
- files renamed:
- contrib/bash/bzr.simple => contrib/bash/bzr
- bzrlib/util/elementtree/ => elementtree/
- bzrlib/util/urlgrabber/ => urlgrabber/
- files modified:
- .bzrignore
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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# before intset (r923) 2000 versions in 41.5s
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# with intset (r926) 2000 versions in 93s !!!
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# better to just use plain sets.
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# making _extract build and return a list, rather than being a generator
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# takes 37.94s
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# with python -O, r923 does 2000 versions in 36.87s
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# with optimizations to avoid mutating lists - 35.75! I guess copying
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# all the elements every time costs more than the small manipulations.
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# a surprisingly small change.
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# r931, which avoids using a generator for extract, does 36.98s
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# with memoized inclusions, takes 41.49s; not very good
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# with slots, takes 37.35s; without takes 39.16, a bit surprising
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# with the delta calculation mixed in with the add method, rather than
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# separated, takes 36.78s
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# with delta folded in and mutation of the list, 36.13s
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# with all this and simplification of add code, 33s
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# TODO: Perhaps have copy method for Weave instances?
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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 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: Perhaps the API should work only in names to hide the integer
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# indexes from the user?
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import sha
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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 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. (not implemented yet)
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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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"""
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__slots__ = ['_weave', '_parents', '_sha1s', '_names', '_name_map']
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def __init__(self):
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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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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 lookup(self, name):
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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 %s not present in weave" % name)
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def add(self, name, parents, text):
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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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assert isinstance(name, basestring)
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if name in self._name_map:
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raise WeaveError("name %r already present in weave" % name)
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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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s = sha.new()
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map(s.update, text)
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sha1 = s.hexdigest()
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del s
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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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from difflib import SequenceMatcher
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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 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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v = max(versions)
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try:
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while v >= 0:
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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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v -= 1
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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 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:
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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):
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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, index):
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return list(self.annotate_iter(index))
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def annotate_iter(self, version):
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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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for origin, lineno, text in self._extract([version]):
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yield origin, text
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def _walk(self):
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"""Walk the weave.
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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:
422
if isinstance(l, tuple):
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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:
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raise WeaveFormatError('unexpected instruction %r'
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% v)
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else:
438
assert isinstance(l, basestring)
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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):
446
"""Yield annotation of lines in included set.
447
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Yields a sequence of tuples (origin, lineno, text), where
449
origin is the origin version, lineno the index in the weave,
450
and text the text of the line.
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The set typically but not necessarily corresponds to a version.
453
"""
454
included = self.inclusions(versions)
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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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isactive = None
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result = []
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WFE = WeaveFormatError
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for l in self._weave:
468
if isinstance(l, tuple):
469
c, v = l
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isactive = None
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if c == '{':
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assert v not in istack
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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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if v in included:
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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:
486
assert isinstance(l, basestring)
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if isactive is None:
488
isactive = (not dset) and istack and (istack[-1] in included)
489
if isactive:
490
result.append((istack[-1], lineno, l))
491
lineno += 1
492
493
if istack:
494
raise WFE("unclosed insertion blocks at end of weave",
495
istack)
496
if dset:
497
raise WFE("unclosed deletion blocks at end of weave",
498
dset)
499
500
return result
501
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def get_iter(self, version):
505
"""Yield lines for the specified version."""
506
for origin, lineno, line in self._extract([version]):
507
yield line
508
509
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def get(self, index):
511
return list(self.get_iter(index))
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513
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def mash_iter(self, included):
515
"""Return composed version of multiple included versions."""
516
for origin, lineno, text in self._extract(included):
517
yield text
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def dump(self, to_file):
521
from pprint import pprint
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print >>to_file, "Weave._weave = ",
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pprint(self._weave, to_file)
524
print >>to_file, "Weave._parents = ",
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pprint(self._parents, to_file)
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def numversions(self):
530
l = len(self._parents)
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assert l == len(self._sha1s)
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return l
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534
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def __len__(self):
536
return self.numversions()
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def check(self, progress_bar=None):
540
# check no circular inclusions
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for version in range(self.numversions()):
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inclusions = list(self._parents[version])
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if inclusions:
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inclusions.sort()
545
if inclusions[-1] >= version:
546
raise WeaveFormatError("invalid included version %d for index %d"
547
% (inclusions[-1], version))
548
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# try extracting all versions; this is a bit slow and parallel
550
# extraction could be used
551
nv = self.numversions()
552
for version in range(nv):
553
if progress_bar:
554
progress_bar.update('checking text', version, nv)
555
s = sha.new()
556
for l in self.get_iter(version):
557
s.update(l)
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hd = s.hexdigest()
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expected = self._sha1s[version]
560
if hd != expected:
561
raise WeaveError("mismatched sha1 for version %d; "
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"got %s, expected %s"
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% (version, hd, expected))
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# TODO: check insertions are properly nested, that there are
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# no lines outside of insertion blocks, that deletions are
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# properly paired, etc.
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def merge(self, merge_versions):
572
"""Automerge and mark conflicts between versions.
573
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This returns a sequence, each entry describing alternatives
575
for a chunk of the file. Each of the alternatives is given as
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a list of lines.
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If there is a chunk of the file where there's no diagreement,
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only one alternative is given.
580
"""
581
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# approach: find the included versions common to all the
583
# merged versions
584
raise NotImplementedError()
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587
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def _delta(self, included, lines):
589
"""Return changes from basis to new revision.
590
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The old text for comparison is the union of included revisions.
592
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This is used in inserting a new text.
594
595
Delta is returned as a sequence of
596
(weave1, weave2, newlines).
597
598
This indicates that weave1:weave2 of the old weave should be
599
replaced by the sequence of lines in newlines. Note that
600
these line numbers are positions in the total weave and don't
601
correspond to the lines in any extracted version, or even the
602
extracted union of included versions.
603
604
If line1=line2, this is a pure insert; if newlines=[] this is a
605
pure delete. (Similar to difflib.)
606
"""
607
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609
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def plan_merge(self, ver_a, ver_b):
611
"""Return pseudo-annotation indicating how the two versions merge.
612
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This is computed between versions a and b and their common
614
base.
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Weave lines present in none of them are skipped entirely.
617
"""
618
inc_a = self.inclusions([ver_a])
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inc_b = self.inclusions([ver_b])
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inc_c = inc_a & inc_b
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622
for lineno, insert, deleteset, line in self._walk():
623
if deleteset & inc_c:
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# killed in parent; can't be in either a or b
625
# not relevant to our work
626
yield 'killed-base', line
627
elif insert in inc_c:
628
# was inserted in base
629
killed_a = bool(deleteset & inc_a)
630
killed_b = bool(deleteset & inc_b)
631
if killed_a and killed_b:
632
yield 'killed-both', line
633
elif killed_a:
634
yield 'killed-a', line
635
elif killed_b:
636
yield 'killed-b', line
637
else:
638
yield 'unchanged', line
639
elif insert in inc_a:
640
if deleteset & inc_a:
641
yield 'ghost-a', line
642
else:
643
# new in A; not in B
644
yield 'new-a', line
645
elif insert in inc_b:
646
if deleteset & inc_b:
647
yield 'ghost-b', line
648
else:
649
yield 'new-b', line
650
else:
651
# not in either revision
652
yield 'irrelevant', line
653
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yield 'unchanged', '' # terminator
655
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def weave_merge(self, plan):
659
lines_a = []
660
lines_b = []
661
ch_a = ch_b = False
662
663
for state, line in plan:
664
if state == 'unchanged' or state == 'killed-both':
665
# resync and flush queued conflicts changes if any
666
if not lines_a and not lines_b:
667
pass
668
elif ch_a and not ch_b:
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# one-sided change:
670
for l in lines_a: yield l
671
elif ch_b and not ch_a:
672
for l in lines_b: yield l
673
elif lines_a == lines_b:
674
for l in lines_a: yield l
675
else:
676
yield '<<<<\n'
677
for l in lines_a: yield l
678
yield '====\n'
679
for l in lines_b: yield l
680
yield '>>>>\n'
681
682
del lines_a[:]
683
del lines_b[:]
684
ch_a = ch_b = False
685
686
if state == 'unchanged':
687
if line:
688
yield line
689
elif state == 'killed-a':
690
ch_a = True
691
lines_b.append(line)
692
elif state == 'killed-b':
693
ch_b = True
694
lines_a.append(line)
695
elif state == 'new-a':
696
ch_a = True
697
lines_a.append(line)
698
elif state == 'new-b':
699
ch_b = True
700
lines_b.append(line)
701
else:
702
assert state in ('irrelevant', 'ghost-a', 'ghost-b', 'killed-base',
703
'killed-both'), \
704
state
705
706
707
708
709
710
711
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def weave_toc(w):
713
"""Show the weave's table-of-contents"""
714
print '%6s %50s %10s %10s' % ('ver', 'name', 'sha1', 'parents')
715
for i in (6, 50, 10, 10):
716
print '-' * i,
717
print
718
for i in range(w.numversions()):
719
sha1 = w._sha1s[i]
720
name = w._names[i]
721
parent_str = ' '.join(map(str, w._parents[i]))
722
print '%6d %-50.50s %10.10s %s' % (i, name, sha1, parent_str)
723
724
725
726
def weave_stats(weave_file):
727
from bzrlib.progress import ProgressBar
728
from bzrlib.weavefile import read_weave
729
730
pb = ProgressBar()
731
732
wf = file(weave_file, 'rb')
733
w = read_weave(wf)
734
# FIXME: doesn't work on pipes
735
weave_size = wf.tell()
736
737
total = 0
738
vers = len(w)
739
for i in range(vers):
740
pb.update('checking sizes', i, vers)
741
for line in w.get_iter(i):
742
total += len(line)
743
744
pb.clear()
745
746
print 'versions %9d' % vers
747
print 'weave file %9d bytes' % weave_size
748
print 'total contents %9d bytes' % total
749
print 'compression ratio %9.2fx' % (float(total) / float(weave_size))
750
if vers:
751
avg = total/vers
752
print 'average size %9d bytes' % avg
753
print 'relative size %9.2fx' % (float(weave_size) / float(avg))
754
755
756
def usage():
757
print """bzr weave tool
758
759
Experimental tool for weave algorithm.
760
761
usage:
762
weave init WEAVEFILE
763
Create an empty weave file
764
weave get WEAVEFILE VERSION
765
Write out specified version.
766
weave check WEAVEFILE
767
Check consistency of all versions.
768
weave toc WEAVEFILE
769
Display table of contents.
770
weave add WEAVEFILE NAME [BASE...] < NEWTEXT
771
Add NEWTEXT, with specified parent versions.
772
weave annotate WEAVEFILE VERSION
773
Display origin of each line.
774
weave mash WEAVEFILE VERSION...
775
Display composite of all selected versions.
776
weave merge WEAVEFILE VERSION1 VERSION2 > OUT
777
Auto-merge two versions and display conflicts.
778
779
example:
780
781
% weave init foo.weave
782
% vi foo.txt
783
% weave add foo.weave ver0 < foo.txt
784
added version 0
785
786
(create updated version)
787
% vi foo.txt
788
% weave get foo.weave 0 | diff -u - foo.txt
789
% weave add foo.weave ver1 0 < foo.txt
790
added version 1
791
792
% weave get foo.weave 0 > foo.txt (create forked version)
793
% vi foo.txt
794
% weave add foo.weave ver2 0 < foo.txt
795
added version 2
796
797
% weave merge foo.weave 1 2 > foo.txt (merge them)
798
% vi foo.txt (resolve conflicts)
799
% weave add foo.weave merged 1 2 < foo.txt (commit merged version)
800
801
"""
802
803
804
805
def main(argv):
806
import sys
807
import os
808
from weavefile import write_weave, read_weave
809
from bzrlib.progress import ProgressBar
810
811
try:
812
import psyco
813
psyco.full()
814
except ImportError:
815
pass
816
817
if len(argv) < 2:
818
usage()
819
return 0
820
821
cmd = argv[1]
822
823
def readit():
824
return read_weave(file(argv[2], 'rb'))
825
826
if cmd == 'help':
827
usage()
828
elif cmd == 'add':
829
w = readit()
830
# at the moment, based on everything in the file
831
name = argv[3]
832
parents = map(int, argv[4:])
833
lines = sys.stdin.readlines()
834
ver = w.add(name, parents, lines)
835
write_weave(w, file(argv[2], 'wb'))
836
print 'added version %r %d' % (name, ver)
837
elif cmd == 'init':
838
fn = argv[2]
839
if os.path.exists(fn):
840
raise IOError("file exists")
841
w = Weave()
842
write_weave(w, file(fn, 'wb'))
843
elif cmd == 'get': # get one version
844
w = readit()
845
sys.stdout.writelines(w.get_iter(int(argv[3])))
846
847
elif cmd == 'mash': # get composite
848
w = readit()
849
sys.stdout.writelines(w.mash_iter(map(int, argv[3:])))
850
851
elif cmd == 'annotate':
852
w = readit()
853
# newline is added to all lines regardless; too hard to get
854
# reasonable formatting otherwise
855
lasto = None
856
for origin, text in w.annotate(int(argv[3])):
857
text = text.rstrip('\r\n')
858
if origin == lasto:
859
print ' | %s' % (text)
860
else:
861
print '%5d | %s' % (origin, text)
862
lasto = origin
863
864
elif cmd == 'toc':
865
weave_toc(readit())
866
867
elif cmd == 'stats':
868
weave_stats(argv[2])
869
870
elif cmd == 'check':
871
w = readit()
872
pb = ProgressBar()
873
w.check(pb)
874
pb.clear()
875
print '%d versions ok' % w.numversions()
876
877
elif cmd == 'inclusions':
878
w = readit()
879
print ' '.join(map(str, w.inclusions([int(argv[3])])))
880
881
elif cmd == 'parents':
882
w = readit()
883
print ' '.join(map(str, w._parents[int(argv[3])]))
884
885
elif cmd == 'plan-merge':
886
w = readit()
887
for state, line in w.plan_merge(int(argv[3]), int(argv[4])):
888
if line:
889
print '%14s | %s' % (state, line),
890
891
elif cmd == 'merge':
892
w = readit()
893
p = w.plan_merge(int(argv[3]), int(argv[4]))
894
sys.stdout.writelines(w.weave_merge(p))
895
896
elif cmd == 'mash-merge':
897
if len(argv) != 5:
898
usage()
899
return 1
900
901
w = readit()
902
v1, v2 = map(int, argv[3:5])
903
904
basis = w.inclusions([v1]).intersection(w.inclusions([v2]))
905
906
base_lines = list(w.mash_iter(basis))
907
a_lines = list(w.get(v1))
908
b_lines = list(w.get(v2))
909
910
from bzrlib.merge3 import Merge3
911
m3 = Merge3(base_lines, a_lines, b_lines)
912
913
name_a = 'version %d' % v1
914
name_b = 'version %d' % v2
915
sys.stdout.writelines(m3.merge_lines(name_a=name_a, name_b=name_b))
916
else:
917
raise ValueError('unknown command %r' % cmd)
918
919
920
921
def profile_main(argv):
922
import tempfile, hotshot, hotshot.stats
923
924
prof_f = tempfile.NamedTemporaryFile()
925
926
prof = hotshot.Profile(prof_f.name)
927
928
ret = prof.runcall(main, argv)
929
prof.close()
930
931
stats = hotshot.stats.load(prof_f.name)
932
#stats.strip_dirs()
933
stats.sort_stats('cumulative')
934
## XXX: Might like to write to stderr or the trace file instead but
935
## print_stats seems hardcoded to stdout
936
stats.print_stats(20)
937
938
return ret
939
940
941
if __name__ == '__main__':
942
import sys
943
if '--profile' in sys.argv:
944
args = sys.argv[:]
945
args.remove('--profile')
946
sys.exit(profile_main(args))
947
else:
948
sys.exit(main(sys.argv))
949
Loggerhead is a web-based interface for Breezy
Version: 2.0.1