can1357
dcc0dc62cc
vertical movement walks graphemes and snaps to cluster boundaries (no more surrogate splits/wide-glyph drift); wrap-trimmed whitespace keeps a cursor home; kill ops extend over atomic paste markers; undo capped+coalesced, kill ring capped, wrap layout cached, pastes batched; nested-list detection tags structurally instead of sniffing chalk cyan; ordered lists hang by actual bullet width.
52 lines
1.4 KiB
TypeScript
52 lines
1.4 KiB
TypeScript
/**
|
|
* Ring buffer for Emacs-style kill/yank operations.
|
|
*
|
|
* Tracks killed (deleted) text entries. Consecutive kills can accumulate
|
|
* into a single entry. Supports yank (paste most recent) and yank-pop
|
|
* (cycle through older entries).
|
|
*/
|
|
const MAX_ENTRIES = 60;
|
|
|
|
export class KillRing {
|
|
#ring: string[] = [];
|
|
|
|
/**
|
|
* Add text to the kill ring.
|
|
*
|
|
* @param text - The killed text to add
|
|
* @param opts - Push options
|
|
* @param opts.prepend - If accumulating, prepend (backward deletion) or append (forward deletion)
|
|
* @param opts.accumulate - Merge with the most recent entry instead of creating a new one
|
|
*/
|
|
push(text: string, opts: { prepend: boolean; accumulate?: boolean }): void {
|
|
if (!text) return;
|
|
|
|
if (opts.accumulate && this.#ring.length > 0) {
|
|
const last = this.#ring.pop()!;
|
|
this.#ring.push(opts.prepend ? text + last : last + text);
|
|
} else {
|
|
this.#ring.push(text);
|
|
if (this.#ring.length > MAX_ENTRIES) {
|
|
this.#ring.shift();
|
|
}
|
|
}
|
|
}
|
|
|
|
/** Get most recent entry without modifying the ring. */
|
|
peek(): string | undefined {
|
|
return this.#ring.length > 0 ? this.#ring[this.#ring.length - 1] : undefined;
|
|
}
|
|
|
|
/** Move last entry to front (for yank-pop cycling). */
|
|
rotate(): void {
|
|
if (this.#ring.length > 1) {
|
|
const last = this.#ring.pop()!;
|
|
this.#ring.unshift(last);
|
|
}
|
|
}
|
|
|
|
get length(): number {
|
|
return this.#ring.length;
|
|
}
|
|
}
|