import { createHash } from "node:crypto"; import { existsSync, mkdirSync, readFileSync, rmSync, statSync } from "node:fs"; import { extname, join, resolve } from "node:path"; /* WHERE */ const org = resolve(import.meta.dir, ".."); const dist = join(org, "dist"); const DATA_DIR = resolve(org, "../../data/mrlyprod/site/scripts"); const SHOTS = join(DATA_DIR, "shots"); const PROFILE = join(DATA_DIR, "profile"); const CHROME = process.env.CHROME ?? "/Applications/Google Chrome.app/Contents/MacOS/Google Chrome"; const PORT = 9335; const SERVE = 3335; /* WHAT */ const ROUTES = ["/", "/demos/sponge/", "/papers/spin-harmonics/", "/research/discoveries/", "/git/site/kit/ssg/build.ts"]; const SIZES: [string, number, number, boolean][] = [ ["phone", 390, 844, true], ["desktop", 1440, 900, false], ]; const TALL = 6000; const PATIENCE = 15000; /* ARGS */ const args = process.argv.slice(2); const print = args.includes("--print"); const baseline = args.includes("--baseline"); const probe = args.includes("--js") ? args[args.indexOf("--js") + 1] ?? "" : ""; const routes = args.filter((a, i) => !a.startsWith("--") && args[i - 1] !== "--js"); const pages = routes.length ? routes : ROUTES; const out = join(SHOTS, baseline ? "baseline" : "latest"); const base = join(SHOTS, "baseline"); /* SERVER */ const TYPES: Record = { ".css": "text/css", ".html": "text/html; charset=utf-8", ".js": "text/javascript", ".json": "application/json", ".png": "image/png", ".svg": "image/svg+xml", ".wasm": "application/wasm", ".woff2": "font/woff2", }; const html = (bytes: Uint8Array) => new TextDecoder().decode(bytes.subarray(0, 15)).toLowerCase().startsWith(" new Promise((r) => setTimeout(r, ms)); type Target = { type: string; webSocketDebuggerUrl: string }; async function targets(): Promise { try { return (await (await fetch(`http://127.0.0.1:${PORT}/json`)).json()) as Target[]; } catch { return null; } } async function launch() { if (await targets()) throw new Error(`shots: something already answers on port ${PORT}; kill it first`); rmSync(PROFILE, { recursive: true, force: true }); mkdirSync(PROFILE, { recursive: true }); const proc = Bun.spawn( [CHROME, "--headless=new", "--disable-gpu", "--enable-unsafe-swiftshader", "--use-angle=swiftshader", "--no-first-run", "--hide-scrollbars", `--user-data-dir=${PROFILE}`, `--remote-debugging-port=${PORT}`, "about:blank"], { stdout: "ignore", stderr: "ignore" }, ); for (let i = 0; i < 50; i++) { await wait(200); if (proc.exitCode !== null) break; const page = (await targets())?.find((one) => one.type === "page"); if (page) return { proc, page }; } proc.kill(); throw new Error(`shots: no chrome at ${CHROME}; set CHROME to the binary`); } type Reply = { result?: Record; exceptionDetails?: { text: string } }; function driver(ws: WebSocket) { let id = 0; const pending = new Map void>(); const events = new Map void>(); ws.onmessage = (event) => { const m = JSON.parse(String(event.data)); if (m.id && pending.has(m.id)) { pending.get(m.id)!(m.result ?? m.error); pending.delete(m.id); } else if (m.method && events.has(m.method)) { events.get(m.method)!(); events.delete(m.method); } }; const send = (method: string, params = {}) => new Promise((r) => { pending.set(++id, r); ws.send(JSON.stringify({ id, method, params })); }); const once = (method: string) => new Promise((r, fail) => { events.set(method, r); setTimeout(() => fail(new Error(`shots: ${method} never came within ${PATIENCE / 1000} s`)), PATIENCE); }); return { send, once }; } const MOUNTED = `new Promise((r) => { const root = document.getElementById("root"); if (!root) return r(); const t0 = Date.now(); const poll = () => (root.children.length || Date.now() - t0 > 8000 ? r() : setTimeout(poll, 50)); poll(); })`; const STILL = `document.head.insertAdjacentHTML("beforeend", "")`; const READY = `${MOUNTED}.then(() => Promise.all([...document.images].map((i) => { i.loading = "eager"; return (i.complete ? Promise.resolve() : new Promise((r) => { i.onload = i.onerror = r; })).then(() => i.decode().catch(() => 0)); }))).then(() => document.fonts.ready).then(() => { ${STILL}; }).then(() => new Promise((r) => requestAnimationFrame(() => requestAnimationFrame(r)))).then(() => 1)`; const WIDE = `JSON.stringify([...document.querySelectorAll("body *")].filter((el) => !el.closest(".pane, .scrim") && getComputedStyle(el).visibility !== "hidden").map((el) => [el, el.getBoundingClientRect()]).filter(([, r]) => r.right > innerWidth + 1 && r.width > 0).sort((a, b) => b[1].right - a[1].right).slice(0, 4).map(([el, r]) => el.tagName.toLowerCase() + (typeof el.className === "string" && el.className ? "." + el.className.trim().split(/\\s+/).join(".") : "") + " right=" + Math.round(r.right)))`; const name = (route: string, size: string) => `${route.replace(/[^a-z0-9]+/gi, "-").replace(/^-|-$/g, "") || "home"}-${size}${print ? "-print" : ""}.png`; const sha = (bytes: Uint8Array) => createHash("sha256").update(bytes).digest("hex").slice(0, 8); /* RUN */ mkdirSync(out, { recursive: true }); const { proc, page } = await launch(); let shot = 0; let changed = 0; let fresh = 0; try { const ws = new WebSocket(page.webSocketDebuggerUrl); await new Promise((r) => (ws.onopen = r)); const { send, once } = driver(ws); await send("Page.enable"); await send("Emulation.setEmulatedMedia", { media: print ? "print" : "", features: [{ name: "prefers-reduced-motion", value: "reduce" }] }); for (const route of pages) { for (const [size, width, height, mobile] of SIZES) { await send("Emulation.setDeviceMetricsOverride", { width, height, deviceScaleFactor: 1, mobile }); const loaded = once("Page.loadEventFired"); await send("Page.navigate", { url: `http://127.0.0.1:${SERVE}${route}` }); try { await loaded; } catch (error) { console.log(`shots: ${name(route, size)} FAILED ${(error as Error).message}`); continue; } await Promise.race([send("Runtime.evaluate", { expression: READY, awaitPromise: true, returnByValue: true }), wait(PATIENCE)]); await wait(300); const { cssContentSize } = await send("Page.getLayoutMetrics"); const full = Math.min(Math.ceil(cssContentSize.height), TALL); const cap = await send("Page.captureScreenshot", { format: "png", captureBeyondViewport: true, clip: { x: 0, y: 0, width, height: full, scale: 1 } }); const bytes = new Uint8Array(Buffer.from(cap.data, "base64")); const file = name(route, size); await Bun.write(join(out, file), bytes); shot++; const wide = Math.ceil(cssContentSize.width) > width; const was = join(base, file); let verdict = ""; if (!baseline && existsSync(was)) { const same = sha(new Uint8Array(readFileSync(was))) === sha(bytes); verdict = same ? " same" : " DIFF"; if (!same) changed++; } else if (!baseline) { verdict = " new"; fresh++; } console.log(`shots: ${file} ${width}x${full} ${sha(bytes)}${wide ? " OVERFLOW" : ""}${verdict}`); if (probe) { const { result, exceptionDetails } = await send("Runtime.evaluate", { expression: probe, returnByValue: true, awaitPromise: true }); console.log(` ${exceptionDetails ? `probe failed: ${exceptionDetails.text}` : JSON.stringify(result.value)}`); } if (wide) { const { result } = await send("Runtime.evaluate", { expression: WIDE, returnByValue: true }); for (const line of JSON.parse(result.value) as string[]) console.log(` ${line}`); } } } ws.close(); } finally { proc.kill(); await proc.exited; rmSync(PROFILE, { recursive: true, force: true }); server.stop(true); } const tail = baseline ? "baseline written" : `${changed} differ from baseline, ${fresh} new`; console.log(`shots: ${shot} shots in ${out}, ${tail}, chrome killed`); process.exit(0);