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manifest: for diff(), only iterate over files, not flags...
manifest: for diff(), only iterate over files, not flags From manifest.diff(), we return a dict from filename to pairs of pairs of file nodeids and flags (values of the form ((n1,n2),(fl1,fl2))). To create this dict, we currently generate one dict for files (with (n1,n2) values) and one for flags (with (fl1,fl2) values) and then join these dicts. Missing files are represented by None and missing flags by '', but due to the dict joining, the inner pairs themselves can also be None. The only caller, merge.manifestmerge(), then unpacks these values while checking for None values. By inlining the calls to dicthelpers and simplifying it to only iterate over files (ignoring flags-only differences), we can simplify life for our caller.
Jordi Gutiérrez Hermoso - - Load All Authors

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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 = !