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Show HN: Rust library for Undo/Redo using deltas, snapshots or commands
- mikolajw 5mo agoTo answer the usual question these days: the library, including the README which you can read, was written by hand, without LLM usage. I only played somewhat with Codex later on when creating derive macros and with some tests and examples, but that was all also highly manual.
- ivere27 5mo agogood. it would be good to have 'size limit'(such as ring buffer). (or future feature - TTL,expiration)
- metaketa 5mo agoThis is awesome and I've needed it often. Could it hypothetically support filtered undo? For example in a collaborative app where not all edits are owned by the user.
- mikolajw 5mo agoI think you can do that with undoredo by doing all the following: - Having one history bistack for each user or permissions group to enforce ownership; - Giving each new object's a unique key (e.g. from a counter, possibly a persistent one) to prevent key collisions by avoiding ever trying to fill the same container slot more than once; - Storing the objects in a sparse container such as BTreeMap, BTreeSet, HashMap, HashSet to avoid visiting emptied slots when iterating over all the elements. I have not tested this, but it could be a nice case to add to examples. (having used a bullet list I immediately feel the need to explain myself: this message was whole written by hand)