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annotate rust/hg-cpython/src/dagops.rs @ 51197:bc4d83047c6c

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rust-index: helper for revision not in index not involving nodemap This is a good match for exceptions raised from the C implementation, when it is not about a nodemap inconsistency.
author Georges Racinet <georges.racinet@octobus.net>
date Wed, 27 Sep 2023 10:59:04 +0200
parents 4c5f6e95df84
children 578c049f0408
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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 crate::PyRevision;
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13 use crate::{conversion::rev_pyiter_collect, exceptions::GraphError};
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14 use cpython::{PyDict, PyModule, PyObject, PyResult, Python};
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15 use hg::dagops;
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16 use hg::Revision;
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17 use std::collections::HashSet;
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18 use vcsgraph::ancestors::node_rank;
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19 use vcsgraph::graph::{Parents, Rank};
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20
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21 use crate::revlog::pyindex_to_graph;
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22
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23 /// Using the the `index`, return heads out of any Python iterable of Revisions
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24 ///
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25 /// This is the Rust counterpart for `mercurial.dagop.headrevs`
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26 pub fn headrevs(
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27 py: Python,
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28 index: PyObject,
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29 revs: PyObject,
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30 ) -> PyResult<HashSet<PyRevision>> {
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31 let index = pyindex_to_graph(py, index)?;
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32 let mut as_set: HashSet<Revision> = rev_pyiter_collect(py, &revs, &index)?;
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33 dagops::retain_heads(&index, &mut as_set)
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34 .map_err(|e| GraphError::pynew(py, e))?;
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35 Ok(as_set.into_iter().map(Into::into).collect())
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36 }
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37
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38 /// Computes the rank, i.e. the number of ancestors including itself,
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39 /// of a node represented by its parents.
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40 pub fn rank(
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41 py: Python,
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42 index: PyObject,
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43 p1r: PyRevision,
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44 p2r: PyRevision,
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45 ) -> PyResult<Rank> {
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46 node_rank(&pyindex_to_graph(py, index)?, &Parents([p1r.0, p2r.0]))
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47 .map_err(|e| GraphError::pynew_from_vcsgraph(py, e))
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48 }
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49
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50 /// Create the module, with `__package__` given from parent
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51 pub fn init_module(py: Python, package: &str) -> PyResult<PyModule> {
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52 let dotted_name = &format!("{}.dagop", package);
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53 let m = PyModule::new(py, dotted_name)?;
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54 m.add(py, "__package__", package)?;
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55 m.add(py, "__doc__", "DAG operations - Rust implementation")?;
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56 m.add(
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57 py,
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58 "headrevs",
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59 py_fn!(py, headrevs(index: PyObject, revs: PyObject)),
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60 )?;
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61 m.add(
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62 py,
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63 "rank",
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64 py_fn!(py, rank(index: PyObject, p1r: PyRevision, p2r: PyRevision)),
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65 )?;
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66
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67 let sys = PyModule::import(py, "sys")?;
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68 let sys_modules: PyDict = sys.get(py, "modules")?.extract(py)?;
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69 sys_modules.set_item(py, dotted_name, &m)?;
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70 // Example C code (see pyexpat.c and import.c) will "give away the
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71 // reference", but we won't because it will be consumed once the
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72 // Rust PyObject is dropped.
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73 Ok(m)
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74 }