rust: add logging utils
This change adds the `log` crate, the community-approved logging facade backed
by Rust core developers as well as the logging-consumer crate `simple_logger`
to build a foundation for logging from Rust.
Using this setup allows us to choose how to log depending on the way `hg-core`
is used: if it's within the context of `hg-cpython`, we might not want to use
it the same way as with a direct cli for example.
Differential Revision: https://phab.mercurial-scm.org/D8252
[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"
build = "build.rs"
[lib]
name = "hg"
[dependencies]
byteorder = "1.3.1"
hex = "0.4.0"
lazy_static = "1.3.0"
libc = { version = "0.2.66", optional = true }
memchr = "2.2.0"
rand = "0.6.5"
rand_pcg = "0.1.1"
rayon = "1.3.0"
regex = "1.1.0"
twox-hash = "1.5.0"
same-file = "1.0.6"
crossbeam = "0.7.3"
log = "0.4.8"
[dev-dependencies]
clap = "*"
memmap = "0.7.0"
pretty_assertions = "0.6.1"
tempfile = "3.1.0"
[build-dependencies]
cc = { version = "1.0.48", optional = true }
[features]
default = []
with-re2 = ["cc", "libc"]