rust/chg/Cargo.toml

rust-cpython: bindings for MissingAncestors

The exposition is rather straightforward, except for the
remove_ancestors_from() method, which forces us to an inefficient
conversion between Python sets and Rust HashSets.

Two alternatives are proposed in comments:

- changing the inner API to "emit" the revision numbers to discard
  this would be a substantial change, and it would be better only in the
  cases where there are more to retain than to discard
- mutating the Python set directly: this would force us to define an abstract
  `RevisionSet` trait, and implement it both for plain `HashSet` and for
  a struct enclosing a Python set with the GIL marker `Python<'p>`, also a non
  trivial effort.

The main (and seemingly only) caller of this method being
`mercurial.setdiscovery`, which is currently undergoing serious refactoring,
it's not clear whether these improvements would be worth the effort right now,
so we're leaving it as-is.

Also, in `get_bases()` (will also be used by `setdiscovery`), we'd prefer
to build a Python set directly, but we resort to returning a tuple, waiting
to hear back from our PR onto rust-cpython about that

Differential Revision: https://phab.mercurial-scm.org/D5550

[package]
name = "chg"
version = "0.1.0"
authors = ["Yuya Nishihara <[e-mail]>"]
description = "Client for Mercurial command server with cHg extension"
license = "GPL-2.0+"

[dependencies]
bytes = "0.4"
futures = "0.1"
libc = "0.2"
log = { version = "0.4", features = ["std"] }
tokio = "0.1"
tokio-hglib = "0.2"
# TODO: "^0.2.3" once released. we need AsRawFd support.
tokio-process = { git = "https://github.com/alexcrichton/tokio-process" }
tokio-timer = "0.2"

[build-dependencies]
cc = "1.0"