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annotate rust/hg-cpython/src/dagops.rs @ 41694:0c7b353ce100

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rust-cpython: binding for headrevs() This uses the core `dagops::retain_heads` to give a Rust implementation to `mercurial.dagop.headrevs`. Testing happens for now from `test-rust-ancestors.py` (for quick and minimal change), but it'd made more sense to put the binary index data elsewhere and to create a new test python module
author Georges Racinet <georges.racinet@octobus.net>
date Thu, 10 Jan 2019 18:25:18 +0100
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children d26e4a434fe5
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1 // dagops.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::dagops` module provided by the
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9 //! `hg-core` package.
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10 //!
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11 //! From Python, this will be seen as `mercurial.rustext.dagop`
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12 use cindex::Index;
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13 use cpython::{PyDict, PyModule, PyObject, PyResult, Python};
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14 use crate::conversion::{py_set, rev_pyiter_collect};
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15 use exceptions::GraphError;
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16 use hg::dagops;
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17 use hg::Revision;
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18 use std::collections::HashSet;
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19
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20 /// Using the the `index`, return heads out of any Python iterable of Revisions
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21 ///
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22 /// This is the Rust counterpart for `mercurial.dagop.headrevs`
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23 pub fn headrevs(
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24 py: Python,
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25 index: PyObject,
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26 revs: PyObject,
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27 ) -> PyResult<PyObject> {
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28 let mut as_set: HashSet<Revision> = rev_pyiter_collect(py, &revs)?;
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29 dagops::retain_heads(&Index::new(py, index)?, &mut as_set)
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30 .map_err(|e| GraphError::pynew(py, e))?;
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31 py_set(py, &as_set)
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32 }
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33
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34 /// Create the module, with `__package__` given from parent
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35 pub fn init_module(py: Python, package: &str) -> PyResult<PyModule> {
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36 let dotted_name = &format!("{}.dagop", package);
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37 let m = PyModule::new(py, dotted_name)?;
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38 m.add(py, "__package__", package)?;
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39 m.add(py, "__doc__", "DAG operations - Rust implementation")?;
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40 m.add(
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41 py,
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42 "headrevs",
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43 py_fn!(py, headrevs(index: PyObject, revs: PyObject)),
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44 )?;
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45
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46 let sys = PyModule::import(py, "sys")?;
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47 let sys_modules: PyDict = sys.get(py, "modules")?.extract(py)?;
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48 sys_modules.set_item(py, dotted_name, &m)?;
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49 // Example C code (see pyexpat.c and import.c) will "give away the
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50 // reference", but we won't because it will be consumed once the
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51 // Rust PyObject is dropped.
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52 Ok(m)
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53 }