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revert: properly back up added files with local modification...
revert: properly back up added files with local modification These files were previously not backed up because the backup mechanism was not smart enough. This leads to data lose for the user since uncommitted contents were discarded. We now properly move the modified version to <filename>.orig before deleting it. We have to use a small hack to do a different action if "--no-backup" is specified. This is needed because the backup process is actually a move (not a copy) so the file is already missing when we backup. The internet kitten is a bit disapointed about that, but such is life. This patch concludes the "lets refactor revert" phases. We can now open the "Lets find stupid bug with renames and merge" phases. I'm sure that now that the code is clearer we could do it in another simpler way, but I consider the current improvement good enough for now.

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extensions.txt
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Mercurial has the ability to add new features through the use of
extensions. Extensions may add new commands, add options to
existing commands, change the default behavior of commands, or
implement hooks.
To enable the "foo" extension, either shipped with Mercurial or in the
Python search path, create an entry for it in your configuration file,
like this::
[extensions]
foo =
You may also specify the full path to an extension::
[extensions]
myfeature = ~/.hgext/myfeature.py
See :hg:`help config` for more information on configuration files.
Extensions are not loaded by default for a variety of reasons:
they can increase startup overhead; they may be meant for advanced
usage only; they may provide potentially dangerous abilities (such
as letting you destroy or modify history); they might not be ready
for prime time; or they may alter some usual behaviors of stock
Mercurial. It is thus up to the user to activate extensions as
needed.
To explicitly disable an extension enabled in a configuration file of
broader scope, prepend its path with !::
[extensions]
# disabling extension bar residing in /path/to/extension/bar.py
bar = !/path/to/extension/bar.py
# ditto, but no path was supplied for extension baz
baz = !