rust: Make OwningDirstateMap generic and move it into hg-core
This will enable using it in rhg too.
The `OwningDirstateMap::new_empty` constructor is generic and accepts a value
of any type that gives acces to a bytes buffer. That buffer must stay valid
as long as the value hasn’t been dropped, and must keep its memory address
even if the value is moved. The `StableDeref` marker trait encodes those
constraints. Previously no trait was needed because the value was always
of type `PyBytes` which we know satisfies those constraints.
The buffer type is ereased in the struct itself through boxing and
dynamic dispatch, in order to simplify other signatures that mention
`OwningDirstateMap`.
Differential Revision: https://phab.mercurial-scm.org/D11396
[package]
name = "hg-core"
version = "0.1.0"
authors = ["Georges Racinet <gracinet@anybox.fr>"]
description = "Mercurial pure Rust core library, with no assumption on Python bindings (FFI)"
edition = "2018"
[lib]
name = "hg"
[dependencies]
bytes-cast = "0.2"
byteorder = "1.3.4"
derive_more = "0.99"
home = "0.5"
im-rc = "15.0.*"
itertools = "0.9"
lazy_static = "1.4.0"
rand = "0.7.3"
rand_pcg = "0.2.1"
rand_distr = "0.2.2"
rayon = "1.3.0"
regex = "1.3.9"
sha-1 = "0.9.6"
twox-hash = "1.5.0"
same-file = "1.0.6"
stable_deref_trait = "1.2.0"
tempfile = "3.1.0"
crossbeam-channel = "0.4"
micro-timer = "0.3.0"
log = "0.4.8"
memmap = "0.7.0"
zstd = "0.5.3"
format-bytes = "0.2.2"
# We don't use the `miniz-oxide` backend to not change rhg benchmarks and until
# we have a clearer view of which backend is the fastest.
[dependencies.flate2]
version = "1.0.16"
features = ["zlib"]
default-features = false
[dev-dependencies]
clap = "*"
pretty_assertions = "0.6.1"