Crate undo_core 

undo-core — the reversible side-effect engine behind undo, “Ctrl-Z for AI agents”.

The model is small on purpose:

• Effect is a change paired with how to reverse it.
• Undo is an append-only journal of effects, grouped by checkpoint, plus a rollback executor that replays their inverses — crash-safely, under a cross-process lock, with directory/permission/symlink fidelity and a redo stack.

Filesystem effects are fully reversible today. The same journal is built to carry network, email, and database effects (which know their own inverse) without changing the rollback path — that uniform reversibility is the point.

Structs

DiffEntry

One changed path in the diff.

HttpCompensator

The request that reverses an HttpMutation.

RedoReport

What a redo did.

RollbackReport

What a rollback did.

Status

What’s changed since the last checkpoint.

Store

Undo

A handle on one project’s undo history.

Enums

Effect

A reversible (or at least auditable) side effect.

Row

One line in the journal.

Functions

path_is_ignored

True if any component of path is an ignored directory (e.g. node_modules, .git, .undo). The watcher uses this to filter events with the exact same definition the snapshotter uses, so the two never disagree.