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nodemap: add a (python) index class for persistent nodemap testing...
nodemap: add a (python) index class for persistent nodemap testing Using the persistent nodemap require a compeling performance boost and an existing implementation. The benefit of the persistent nodemap for pure python code is unclear and we don't have a C implementation for it. Yet we would like to actually start testing it in more details and define an API for using that persistent nodemap. We introduce a new `devel` config option to use an index class dedicated to Nodemap Testing. This feature is "pure" only because having using a pure-python index with the `cext` policy proved more difficult than I would like. There is nothing going on in that class for now, but the coming changeset will change that. Differential Revision: https://phab.mercurial-scm.org/D7840
Matt Harbison - - Load All Authors

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Mercurial's default format for showing changes between two versions of
a file is compatible with the unified format of GNU diff, which can be
used by GNU patch and many other standard tools.
While this standard format is often enough, it does not encode the
following information:
- executable status and other permission bits
- copy or rename information
- changes in binary files
- creation or deletion of empty files
Mercurial also supports the extended diff format from the git VCS
which addresses these limitations. The git diff format is not produced
by default because a few widespread tools still do not understand this
format.
This means that when generating diffs from a Mercurial repository
(e.g. with :hg:`export`), you should be careful about things like file
copies and renames or other things mentioned above, because when
applying a standard diff to a different repository, this extra
information is lost. Mercurial's internal operations (like push and
pull) are not affected by this, because they use an internal binary
format for communicating changes.
To make Mercurial produce the git extended diff format, use the --git
option available for many commands, or set 'git = True' in the [diff]
section of your configuration file. You do not need to set this option
when importing diffs in this format or using them in the mq extension.