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inotify: server: new data structure to keep track of changes....
inotify: server: new data structure to keep track of changes. == Rationale for the new structure == Current structure was a dictionary tree. One directory was tracked as a dictionary: - keys: file/subdir name - values: - for a file, the status (a/r/m/...) - for a subdir, the directory representing the subdir It allowed efficient lookups, no matter of the type of the terminal leaf: for part in path.split('/'): tree = tree[part] However, there is no way to represent a directory and a file with the same name because keys are conflicting in the dictionary. Concrete example: Initial state: root dir |- foo (file) |- bar (file) # data state is: {'foo': 'n', 'bar': 'n'} Remove foo: root dir |- bar (file) # Data becomes {'foo': 'r'} until next commit. Add foo, as a directory, and foo/barbar file: root dir |- bar (file) |-> foo (dir) |- barbar (file) # New state should be represented as: {'foo': {'barbar': 'a'}, 'bar': 'n'} however, the key "foo" is already used and represents the old file. The dirstate: D foo A foo/barbar cannot be represented, hence the need for a new structure. == The new structure == 'directory' class. Represents one directory level. * Notable attributes: Two dictionaries: - 'files' Maps filename -> status for the current dir. - 'dirs' Maps subdir's name -> directory object representing the subdir * methods - walk(), formerly server.walk - lookup(), old server.lookup - dir(), old server.dir This new class allows embedding all the tree walks/lookups in its own class, instead of having everything mixed together in server. Incidently, since files and directories are not stored in the same dictionaries, we are solving the previous key conflict problem. The small drawback is that lookup operation is a bit more complex: for a path a/b/c/d/e we have to check twice the leaf, if e is a directory or a file.
Martin Geisler - - Load All Authors

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share.py
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Matt Mackall
share: add experimental share extension
 r8801 # Copyright 2006, 2007 Matt Mackall <mpm@selenic.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2, incorporated herein by reference.
Cédric Duval
extensions: improve the consistency of synopses...
 r8894 '''share a common history between several working directories'''
Dirkjan Ochtman
help: add/fix docstrings for a bunch of extensions
 r8873
Matt Mackall
share: add experimental share extension
 r8801 from mercurial.i18n import _
from mercurial import hg, commands
Matt Mackall
share: allow dest to default to the basename of source
 r8807 def share(ui, source, dest=None, noupdate=False):
Matt Mackall
share: add experimental share extension
 r8801 """create a new shared repository (experimental)
Martin Geisler
share: wrapped docstrings at 78 characters
 r9075 Initialize a new repository and working directory that shares its history
with another repository.
Matt Mackall
share: add experimental share extension
 r8801
Martin Geisler
share: wrapped docstrings at 78 characters
 r9075 NOTE: actions that change history such as rollback or moving the source
may confuse sharers.
Matt Mackall
share: add experimental share extension
 r8801 """
return hg.share(ui, source, dest, not noupdate)
cmdtable = {
"share":
(share,
[('U', 'noupdate', None, _('do not create a working copy'))],
Matt Mackall
share: allow dest to default to the basename of source
 r8807 _('[-U] SOURCE [DEST]')),
Matt Mackall
share: add experimental share extension
 r8801 }
commands.norepo += " share"