Function backspace

src/cli/components/editor-logic.ts:40–43

(text: string, cursor: number)

/** Backspace one char left of cursor. */
export function backspace(text: string, cursor: number): { text: string; cursor: number } {
  if (cursor <= 0) return { text, cursor: 0 };
  return { text: text.slice(0, cursor - 1) + text.slice(cursor), cursor: cursor - 1 };
}

/** Delete the half-open range [from,to) (order-independent). Returns text + cursor at range start. */
export function deleteRange(text: string, from: number, to: number): { text: string; cursor: number } {