view rust/hg-core/src/operations/mod.rs @ 45610:496537c9c1b4

rust: start plugging the dirstate tree behind a feature gate

The previous patch added the `dirstate-tree` feature gate to enable the two
dirstate implementations to co-habit while the tree-based one gets better.

This patch copies over the code that differs, be it because the algorithm
changed or because the borrowing rules are different.

Indeed, `DirstateTree` is not observationally equivalent to the std `HashMap` in
the APIs we use: it does not have the `Entry` API (yet?) and its iterator
returns owned values instead of references. This last point is because the
implementation needs to be changed to a more clever and efficient solution.

Differential Revision: https://phab.mercurial-scm.org/D9133

//! A distinction is made between operations and commands.
//! An operation is what can be done whereas a command is what is exposed by
//! the cli. A single command can use several operations to achieve its goal.

mod cat;
mod debugdata;
mod dirstate_status;
mod find_root;
mod list_tracked_files;
pub use cat::{CatRev, CatRevError, CatRevErrorKind};
pub use debugdata::{
    DebugData, DebugDataError, DebugDataErrorKind, DebugDataKind,
};
pub use find_root::{FindRoot, FindRootError, FindRootErrorKind};
pub use list_tracked_files::{
    ListDirstateTrackedFiles, ListDirstateTrackedFilesError,
    ListDirstateTrackedFilesErrorKind,
};
pub use list_tracked_files::{
    ListRevTrackedFiles, ListRevTrackedFilesError,
    ListRevTrackedFilesErrorKind,
};

// TODO add an `Operation` trait when GAT have landed (rust #44265):
// there is no way to currently define a trait which can both return
// references to `self` and to passed data, which is what we would need.
// Generic Associated Types may fix this and allow us to have a unified
// interface.