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cext: change two more vars to Py_ssize_t in manifest.c...
cext: change two more vars to Py_ssize_t in manifest.c D7913 fixed a compiler warning with a signedness conflict in a ternary operator by changing the types of some variables to be Py_ssize_t instead of size_t or int. That commit missed these two cases since they aren't warned about (at least on my compiler). Both of these variables are produced by operations on variables that are themselves Py_ssize_t now/already, so they should keep the same type. Differential Revision: https://phab.mercurial-scm.org/D7964
Kyle Lippincott -
r44594:f0a4084f stable
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Mercurial Rust Code

This directory contains various Rust code for the Mercurial project. Rust is not required to use (or build) Mercurial, but using it improves performance in some areas.

There are currently three independent rust projects: - chg. An implementation of chg, in rust instead of C. - hgcli. A experiment for starting hg in rust rather than in python,

by linking with the python runtime. Probably meant to be replaced by PyOxidizer at some point.
  • hg-core (and hg-cpython/hg-directffi): implementation of some functionality of mercurial in rust, e.g. ancestry computations in revision graphs or pull discovery. The top-level Cargo.toml file defines a workspace containing these crates.

Using hg-core

Local use (you need to clean previous build artifacts if you have built without rust previously):

$ HGWITHRUSTEXT=cpython make local # to use ./hg
$ HGWITHRUSTEXT=cpython make tests # to run all tests
$ (cd tests; HGWITHRUSTEXT=cpython ./run-tests.py) # only the .t
$ ./hg debuginstall | grep rust # to validate rust is in use
checking module policy (rust+c-allow)

Setting HGWITHRUSTEXT to other values like true is deprecated and enables only a fraction of the rust code.

Developing hg-core

Simply run:

$ cargo build --release

It is possible to build without --release, but it is not recommended if performance is of any interest: there can be an order of magnitude of degradation when removing --release.

For faster builds, you may want to skip code generation:

$ cargo check

You can run only the rust-specific tests (as opposed to tests of mercurial as a whole) with:

$ cargo test --all