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annotate rust/hg-cpython/src/conversion.rs @ 44350:c577bb4a04d4

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nodemap: have some python code writing a nodemap in persistent binary form This python code aims to be as "simple" as possible. It is a reference implementation of the data we are going to write on disk (and possibly, later a way for pure python install to make sure the on disk data are up to date). It is not optimized for performance and rebuild the full data structure from the index every time. This is a stepping stone toward a persistent nodemap on disk. Differential Revision: https://phab.mercurial-scm.org/D7834
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Wed, 15 Jan 2020 15:47:12 +0100
parents 33fe96a5c522
children c7fb9b74e753
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1 // conversion.rs
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2 //
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3 // Copyright 2019 Georges Racinet <georges.racinet@octobus.net>
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4 //
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5 // This software may be used and distributed according to the terms of the
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6 // GNU General Public License version 2 or any later version.
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7
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8 //! Bindings for the hg::ancestors module provided by the
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9 //! `hg-core` crate. From Python, this will be seen as `rustext.ancestor`
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11 use cpython::{ObjectProtocol, PyObject, PyResult, Python};
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12 use hg::Revision;
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13 use std::iter::FromIterator;
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14
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15 /// Utility function to convert a Python iterable into various collections
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16 ///
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17 /// We need this in particular to feed to various methods of inner objects
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18 /// with `impl IntoIterator<Item=Revision>` arguments, because
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19 /// a `PyErr` can arise at each step of iteration, whereas these methods
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20 /// expect iterables over `Revision`, not over some `Result<Revision, PyErr>`
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21 pub fn rev_pyiter_collect<C>(py: Python, revs: &PyObject) -> PyResult<C>
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22 where
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23 C: FromIterator<Revision>,
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24 {
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25 revs.iter(py)?
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26 .map(|r| r.and_then(|o| o.extract::<Revision>(py)))
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27 .collect()
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28 }