annotate rust/hg-cpython/src/conversion.rs @ 47202:0de5eefbe4b2

contrib: install PyOxidizer 0.16.0

PyOxidizer now provides MSI installers and pre-built Linux binaries.
So we install that way. This significantly reduces the time to bootstrap
a new machine in automation, as building PyOxidizer from source on a low
core count machine takes several minutes.

This change temporarily breaks the ability of the automated environment
to use the in-repo pyoxidizer.bzl configuration file, as there are
backwards-incompatible changes with the upgrade that need to be
reflected. We'll handle those in subsequent commits.

Differential Revision: https://phab.mercurial-scm.org/D10680

// conversion.rs
//
// Copyright 2019 Georges Racinet <[e-mail]>
//
// This software may be used and distributed according to the terms of the
// GNU General Public License version 2 or any later version.

//! Bindings for the hg::ancestors module provided by the
//! `hg-core` crate. From Python, this will be seen as `rustext.ancestor`

use cpython::{ObjectProtocol, PyObject, PyResult, Python};
use hg::Revision;
use std::iter::FromIterator;

/// Utility function to convert a Python iterable into various collections
///
/// We need this in particular to feed to various methods of inner objects
/// with `impl IntoIterator<Item=Revision>` arguments, because
/// a `PyErr` can arise at each step of iteration, whereas these methods
/// expect iterables over `Revision`, not over some `Result<Revision, PyErr>`
pub fn rev_pyiter_collect<C>(py: Python, revs: &PyObject) -> PyResult<C>
where
    C: FromIterator<Revision>,
{
    revs.iter(py)?
        .map(|r| r.and_then(|o| o.extract::<Revision>(py)))
        .collect()
}