app/tui/useLaneSnapshots.ts

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Ladder Summary

file The file exports a single React hook, **`useLaneSnapshots`**, which continuously polls a list of repositories (locally via `listLanes` or remotely via `callRemoteTool`) on a configurable interval and aggregates the results into an array of **`LaneSnapshot`** objects. It memoizes the repository list to avoid unnecessary restarts of the polling timer, runs the reads in parallel, and cleans up the interval when the component unmounts or the inputs change.

// Polls `listLanes` across a set of repos on an interval -- the one data

// source both `zz work`'s default view and `zz top` render from. Polling

// instead of a real subscription because the underlying state is still

// flat JSON files (and later, a Backend read) -- there's nothing to

// subscribe to yet, only something to re-read.

import { useEffect, useState } from "react";

import { listLanes } from "../engine/store.js";

import type { LaneSnapshot } from "./types.js";

export function useLaneSnapshots(repos: { repo: string; stateDir: string }[], intervalMs = 500): LaneSnapshot[] {

const [snapshots, setSnapshots] = useState<LaneSnapshot[]>([]);

useEffect(() => {

const read = () => {

const next: LaneSnapshot[] = [];

for (const { repo, stateDir } of repos) {

for (const lane of listLanes(stateDir)) next.push({ repo, lane });

}

setSnapshots(next);

};

read();

const id = setInterval(read, intervalMs);

return () => clearInterval(id);

// repos is expected to be stable for the process's lifetime (the configured repo list)

// eslint-disable-next-line react-hooks/exhaustive-deps

}, [intervalMs]);

return snapshots;

}