Function bumpSelectPrompt

packages/bumpy/src/prompts/bump-select.ts:40–291

(items: BumpSelectItem[])

 * its anchor once content scrolls off-screen.
 */
export async function bumpSelectPrompt(items: BumpSelectItem[]): Promise<BumpSelectResult[] | symbol> {
  // Build display order: changed first, then unchanged
  const changedEntries = items.map((item, idx) => ({ item, idx })).filter(({ item }) => item.changed);
  const unchangedEntries = items.map((item, idx) => ({ item, idx })).filter(({ item }) => !item.changed);
  const displayOrder = [...changedEntries, ...unchangedEntries];

  // Build a flat list of rows (headers, separators, items) — static structure used for windowing.
  const rows: Row[] = [];
  const itemRowIndex: number[] = []; // displayIdx -> index into rows
  {
    let displayIdx = 0;
    if (changedEntries.length > 0) {
      rows.push({ kind: 'header', text: 'Changed' });
      for (const { idx } of changedEntries) {
        itemRowIndex.push(rows.length);
        rows.push({ kind: 'item', itemIdx: idx, displayIdx });
        displayIdx++;
      }
      if (unchangedEntries.length > 0) {
        rows.push({ kind: 'separator' });
      }
    }
    if (unchangedEntries.length > 0) {
      rows.push({ kind: 'header', text: 'Unchanged' });
      for (const { idx } of unchangedEntries) {
        itemRowIndex.push(rows.length);
        rows.push({ kind: 'item', itemIdx: idx, displayIdx });
        displayIdx++;
      }
    }
  }

  // State
  let cursor = 0;
  let scroll = 0;
  const levels: BumpLevel[] = items.map((item) =>
    item.initialLevel !== undefined ? item.initialLevel : item.changed ? 'patch' : 'skip',
  );

  return new Promise<BumpSelectResult[] | symbol>((resolve) => {
    const { stdin, stdout } = process;
    const rl = readline.createInterface({ input: stdin, terminal: true });

    // Hide cursor
    stdout.write('\x1B[?25l');

    let renderedLines = 0;

    function render(final = false) {
      // Clear previous render
      if (renderedLines > 0) {
        stdout.write(`\x1B[${renderedLines}A`); // Move up
        stdout.write('\x1B[0J'); // Clear from cursor to end
      }

      const lines: string[] = [];

      if (final) {