comparison rust/hg-core/src/dagops.rs @ 44973:26114bd6ec60

rust: do a clippy pass

This is the result of running `cargo clippy` on hg-core/hg-cpython and fixing
the lints that do not require too much code churn (and would warrant a separate
commit/complete refactor) and only come from our code (a lot of warnings in
hg-cpython come from `rust-cpython`).

Most of those were good lints, two of them was the linter not being smart
enough (or compiler to get up to `clippy`'s level depending on how you see it).

Maybe in the future we could have `clippy` be part of the CI.

Differential Revision: https://phab.mercurial-scm.org/D8635

44962:ef8dcee272ac

//!   whose parents, if any, don't belong to the collection.
use super::{Graph, GraphError, Revision, NULL_REVISION};
use crate::ancestors::AncestorsIterator;
use std::collections::{BTreeSet, HashSet};

fn remove_parents(
    graph: &impl Graph,
    rev: Revision,
    set: &mut HashSet<Revision>,
) -> Result<(), GraphError> {
    for parent in graph.parents(rev)?.iter() {
        if *parent != NULL_REVISION {
            set.remove(parent);
        }

///   heads.
/// - a Rust caller can decide whether cloning beforehand is appropriate
///
/// # Performance notes
/// Internally, this function will store a full copy of `revs` in a `Vec`.
pub fn retain_heads(
    graph: &impl Graph,
    revs: &mut HashSet<Revision>,
) -> Result<(), GraphError> {
    revs.remove(&NULL_REVISION);
    // we need to construct an iterable copy of revs to avoid itering while
    // mutating
    let as_vec: Vec<Revision> = revs.iter().cloned().collect();

}

/// Roots of `revs`, passed as a `HashSet`
///
/// They are returned in arbitrary order
pub fn roots<G: Graph>(
    graph: &G,
    revs: &HashSet<Revision>,
) -> Result<Vec<Revision>, GraphError> {
    let mut roots: Vec<Revision> = Vec::new();
    for rev in revs {
        if graph
            .parents(*rev)?

    /// Apply `roots()` and sort the result for easier comparison
    fn roots_sorted(
        graph: &impl Graph,
        revs: &[Revision],
    ) -> Result<Vec<Revision>, GraphError> {
        let mut as_vec = roots(graph, &revs.iter().cloned().collect())?;
        as_vec.sort();
        Ok(as_vec)
    }

    #[test]

44973:26114bd6ec60

//!   whose parents, if any, don't belong to the collection.
use super::{Graph, GraphError, Revision, NULL_REVISION};
use crate::ancestors::AncestorsIterator;
use std::collections::{BTreeSet, HashSet};

fn remove_parents<S: std::hash::BuildHasher>(
    graph: &impl Graph,
    rev: Revision,
    set: &mut HashSet<Revision, S>,
) -> Result<(), GraphError> {
    for parent in graph.parents(rev)?.iter() {
        if *parent != NULL_REVISION {
            set.remove(parent);
        }

///   heads.
/// - a Rust caller can decide whether cloning beforehand is appropriate
///
/// # Performance notes
/// Internally, this function will store a full copy of `revs` in a `Vec`.
pub fn retain_heads<S: std::hash::BuildHasher>(
    graph: &impl Graph,
    revs: &mut HashSet<Revision, S>,
) -> Result<(), GraphError> {
    revs.remove(&NULL_REVISION);
    // we need to construct an iterable copy of revs to avoid itering while
    // mutating
    let as_vec: Vec<Revision> = revs.iter().cloned().collect();

}

/// Roots of `revs`, passed as a `HashSet`
///
/// They are returned in arbitrary order
pub fn roots<G: Graph, S: std::hash::BuildHasher>(
    graph: &G,
    revs: &HashSet<Revision, S>,
) -> Result<Vec<Revision>, GraphError> {
    let mut roots: Vec<Revision> = Vec::new();
    for rev in revs {
        if graph
            .parents(*rev)?

    /// Apply `roots()` and sort the result for easier comparison
    fn roots_sorted(
        graph: &impl Graph,
        revs: &[Revision],
    ) -> Result<Vec<Revision>, GraphError> {
        let set: HashSet<_> = revs.iter().cloned().collect();
        let mut as_vec = roots(graph, &set)?;
        as_vec.sort();
        Ok(as_vec)
    }

    #[test]