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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.
Matt Mackall - - Load All Authors

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mpm@selenic.com
Add file encoding/decoding support
 r1258 #!/bin/sh
hg init
cat > .hg/hgrc <<EOF
[encode]
Patrick Mezard
tests: Windows compatibility fixes...
 r7080 *.gz = gzip -d
mpm@selenic.com
Add file encoding/decoding support
 r1258
[decode]
*.gz = gzip
EOF
echo "this is a test" | gzip > a.gz
hg add a.gz
Thomas Arendsen Hein
Use 'hg ci -d "1000000 0"' in tests to circumvent problem with leading zero....
 r1933 hg ci -m "test" -d "1000000 0"
mpm@selenic.com
Add file encoding/decoding support
 r1258 echo %% no changes
hg status
touch a.gz
echo %% no changes
hg status
echo %% uncompressed contents in repo
Benoit Boissinot
switch to the .hg/store layout, fix the tests
 r3853 hg debugdata .hg/store/data/a.gz.d 0
mpm@selenic.com
Add file encoding/decoding support
 r1258
echo %% uncompress our working dir copy
gunzip < a.gz
rm a.gz
Matt Mackall
merge: allow merging going backwards...
 r8742 hg co -C
mpm@selenic.com
Add file encoding/decoding support
 r1258
echo %% uncompress our new working dir copy
gunzip < a.gz
Jesse Glick
Option --decode for hg cat to apply decode filters....
 r6093
echo %% check hg cat operation
hg cat a.gz
Thomas Arendsen Hein
cat --decode: Drop short option, use opts.get() instead of opts[]...
 r6094 hg cat --decode a.gz | gunzip
Jesse Glick
Option --decode for hg cat to apply decode filters....
 r6093 mkdir subdir
cd subdir
hg -R .. cat ../a.gz
Thomas Arendsen Hein
cat --decode: Drop short option, use opts.get() instead of opts[]...
 r6094 hg -R .. cat --decode ../a.gz | gunzip