Function foldShellRunToolActivities

packages/ui/src/materialize.ts:791–842

(
  items: readonly ToolActivityItem[],
)

 * revision.
 */
export function foldShellRunToolActivities(
  items: readonly ToolActivityItem[],
): ToolActivityItem[] {
  const ownedRefs = new Set<string>();
  for (const item of items) {
    if (item.toolName === "Bash" && item.result?.kind === "shell_run")
      ownedRefs.add(item.result.ref);
  }

  const folded: ToolActivityItem[] = [];
  const parentIndexByRef = new Map<string, number>();
  const childResultsByRef = new Map<string, ShellRunToolResult[]>();

  for (const item of items) {
    const result = item.result?.kind === "shell_run" ? item.result : undefined;
    if (!result || item.toolName === "Bash") {
      if (result) parentIndexByRef.set(result.ref, folded.length);
      folded.push(item);
      continue;
    }
    if (ownedRefs.has(result.ref)) {
      const pending = childResultsByRef.get(result.ref);
      if (pending) pending.push(result);
      else childResultsByRef.set(result.ref, [result]);
      if (item.toolName === "Read" || item.toolName === "StopBackgroundTask")
        continue;
    }
    folded.push(item);
  }

  for (const [ref, results] of childResultsByRef) {
    const index = parentIndexByRef.get(ref)!;
    const parent = folded[index]!;
    let current =
      parent.result?.kind === "shell_run" ? parent.result : undefined;
    let changed = false;
    for (const result of results) {
      const merged = mergeShellRunStateWithDiagnostics(
        current,
        result,
        "ui.fold-shell-run-child",
      );
      if (merged.changed) {
        current = merged.result;
        changed = true;
      }
    }
    if (changed && current) folded[index] = { ...parent, result: current };
  }

  return folded;
}

function foldShellRunTurns(
  turns: readonly TurnViewModel[],