● 0.0.0 placeholder MIT no_std + alloc

Vim engine.
Rope buffer. No I/O.

Modal editor primitives in Rust.

One vim implementation, many surfaces. TUI, GUI, browser — same FSM.

hjkl — engine demo

// drive a vim FSM. no I/O, no terminal, no allocator beyond `alloc`.
use hjkl_engine::{Engine, Mode, Key};
use hjkl_buffer::Rope;

let mut rope = Rope::from_str("hello, world");
let mut eng  = Engine::new();

eng.feed(Key::Char('d'));      // pending: delete
eng.feed(Key::Char('w'));      // motion:  word

match eng.commit() {
    Action::Delete(range) => rope.remove(range),
    _                     => {}
}

assert_eq!(rope.to_string(), "world");
assert_eq!(eng.mode(), Mode::Normal);

crates

Four crates. Pick what you need.

hjkl-engine

no_std + alloc · core

Vim FSM + grammar. Pending-operator state, motions, text objects, registers. No I/O deps.

hjkl-buffer

no_std + alloc · data

Rope-backed text buffer with cursor, edits, and undo tree. O(log n) inserts and deletes.

hjkl-editor

std · glue

Engine + buffer + registers + ex commands wired together. The "ready-to-host" surface.

hjkl-ratatui

optional · adapter

Ratatui Style adapters and KeyEvent conversions. Drop into any TUI.

why

One vim, many surfaces.

01 — REUSE

Extracted from sqeel

Same FSM that drives sqeel will drive buffr and a future standalone hjkl binary.

02 — PURE

No I/O in the core

Bring your own renderer, your own clipboard, your own filesystem. The engine just transitions states.

03 — PORTABLE

`no_std + alloc`

Runs anywhere Rust does. Embedded, WASM, kernel modules, your weird side project — all fair game.

04 — TYPED

Trait-driven

Buffers, clipboards, search providers — all traits. Swap implementations without touching the FSM.

05 — TESTED

Property-tested

Vim grammar fuzzed against reference behaviour. Rope invariants hold under any edit sequence.

06 — OPEN

MIT, all of it

Every crate, every adapter. Fork it, vendor it, ship it. No catch.

status

Pre-release. Names reserved.

Status: 0.0.0 placeholders on crates.io. No public API yet.

Active extraction from sqeel. See MIGRATION.md for the full plan and design rationale. Watch github.com/kryptic-sh/hjkl for the first real release.