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wireprotov2: define and implement "changesetdata" command...
wireprotov2: define and implement "changesetdata" command This commit introduces the "changesetdata" wire protocol command. The role of the command is to expose data associated with changelog revisions, including the raw revision data itself. This command is the first piece of a new clone/pull strategy that is built on top of domain-specific commands for data retrieval. Instead of a monolithic "getbundle" command that transfers all of the things, we'll be introducing commands for fetching specific pieces of data. Since the changeset is the fundamental unit from which we derive pointers to other data (manifests, file nodes, etc), it makes sense to start reimplementing pull with this data. The command accepts as arguments a set of root and head revisions defining the changesets that should be fetched as well as an explicit list of nodes. By default, the command returns only the node values: the client must explicitly request additional fields be added to the response. Current supported fields are the list of parent nodes and the revision fulltext. My plan is to eventually add support for transferring other data associated with changesets, including phases, bookmarks, obsolescence markers, etc. Since the response format is CBOR, we'll be able to add this data into the response object relatively easily (it should be as simple as adding a key in a map). The documentation captures a number of TODO items. Some of these may require BC breaking changes. That's fine: wire protocol v2 is still highly experimental. Differential Revision: https://phab.mercurial-scm.org/D4481
Yuya Nishihara - - Load All Authors

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filesets.txt
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Mercurial supports a functional language for selecting a set of
files.
Like other file patterns, this pattern type is indicated by a prefix,
'set:'. The language supports a number of predicates which are joined
by infix operators. Parenthesis can be used for grouping.
Identifiers such as filenames or patterns must be quoted with single
or double quotes if they contain characters outside of
``[.*{}[]?/\_a-zA-Z0-9\x80-\xff]`` or if they match one of the
predefined predicates. This generally applies to file patterns other
than globs and arguments for predicates. Pattern prefixes such as
``path:`` may be specified without quoting.
Special characters can be used in quoted identifiers by escaping them,
e.g., ``\n`` is interpreted as a newline. To prevent them from being
interpreted, strings can be prefixed with ``r``, e.g. ``r'...'``.
See also :hg:`help patterns`.
Operators
=========
There is a single prefix operator:
``not x``
Files not in x. Short form is ``! x``.
These are the supported infix operators:
``x and y``
The intersection of files in x and y. Short form is ``x & y``.
``x or y``
The union of files in x and y. There are two alternative short
forms: ``x | y`` and ``x + y``.
``x - y``
Files in x but not in y.
Predicates
==========
The following predicates are supported:
.. predicatesmarker
Examples
========
Some sample queries:
- Show status of files that appear to be binary in the working directory::
hg status -A "set:binary()"
- Forget files that are in .hgignore but are already tracked::
hg forget "set:hgignore() and not ignored()"
- Find text files that contain a string::
hg files "set:grep(magic) and not binary()"
- Find C files in a non-standard encoding::
hg files "set:**.c and not encoding('UTF-8')"
- Revert copies of large binary files::
hg revert "set:copied() and binary() and size('>1M')"
- Revert files that were added to the working directory::
hg revert "set:revs('wdir()', added())"
- Remove files listed in foo.lst that contain the letter a or b::
hg remove "set: listfile:foo.lst and (**a* or **b*)"