comparison rust/hg-core/src/dirstate.rs @ 45562:b51167d70f5a

rust: add `dirstate_tree` module

Mercurial needs to represent the filesystem hierarchy on which it operates, for
example in the dirstate. Its current on-disk representation is an unsorted, flat
structure that gets transformed in the current Rust code into a `HashMap`.
This loses the hierarchical information of the dirstate, leading to some
unfortunate performance and algorithmic compromises.

This module adds an implementation of a radix tree that is specialized for
representing the dirstate: its unit is the path component. I have made no
efforts to optimize either its memory footprint or its insertion speed: they're
pretty bad for now.

Following will be a few patches that modify the dirstate.status logic to use
that new hierarchical information, fixing issue 6335 in the same swing.

Differential Revision: https://phab.mercurial-scm.org/D9085

45558:80bf7b1ada15

use std::collections::hash_map;
use std::convert::TryFrom;

pub mod dirs_multiset;
pub mod dirstate_map;
pub mod parsers;
pub mod status;

#[derive(Debug, PartialEq, Clone)]
pub struct DirstateParents {

45562:b51167d70f5a

use std::collections::hash_map;
use std::convert::TryFrom;

pub mod dirs_multiset;
pub mod dirstate_map;
pub mod dirstate_tree;
pub mod parsers;
pub mod status;

#[derive(Debug, PartialEq, Clone)]
pub struct DirstateParents {