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duplicate_bugdir() works, but for the vcs backends, it could require
shelling out for _every_ file read. This could, and probably will, be
horribly slow. Still it works ;).
I'm not sure what a better implementation would be. The old
implementation checked out the entire earlier state into a temporary
directory
pros: single shell out, simple upgrade implementation
cons: wouldn't work well for HTTP backens
I think a good solution would run along the lines of the currently
commented out code in duplicate_bugdir(), where a
VersionedStorage.changed_since(revision)
call would give you a list of changed files. diff could work off of
that directly, without the need to generate a whole duplicate bugdir.
I'm stuck on how to handle upgrades though...
Also removed trailing whitespace from all python files.
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The old
.requires_*
thing was rediculous. The new ._get_*() callbacks allow the caller
to provide a means for getting the expensive structures, which the
command can use, or not, as required. This will also make it easier
to implement the completion callbacks.
The callbacks should probably have matching .set_*() methods, to
avoid the current cache tweaking
cmd._storage = ...
etc. But that can wait for now...
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