Logs explorer

// Copyright (c) 2026 Bruno Delorence. MIT License.'use client';import {  useEffect,  useId,  useLayoutEffect,  useMemo,  useRef,  useState,  type KeyboardEvent as ReactKeyboardEvent,  type ReactNode,} from 'react';import {  BARS,  DEFAULT_QUERY,  INCIDENT,  KEEP,  LEVELS,  LEVEL_LABEL,  RANGES,  SERVICES,  SEVERITY,

// Copyright (c) 2026 Bruno Delorence. MIT License./* * The logs explorer's invented world: four services (web, api, checkout, worker) writing lines * from sixteen message templates, an incident on the inventory service a quarter of an hour ago, * and the query language that filters them. * * - Volume is kept as counts per time bucket per template, never as lines: 56 buckets for every *   range (about 16 s, 64 s, 26 min or 3 h each), 16 counts in each. Any query is tested once per *   template, so the histogram and the total follow it exactly without holding 28,000 lines. * - The table holds a few hundred real lines, newest first, each made from its template with its *   own ids, numbers and attributes. The first twelve are written out by hand. * - Everything is seeded, so the screen is the same at every load; the clock is a made-up one, *   Oct 8, 16:16:31.902 CEST, that runs on while the stream is live. */export type Level = 'error' | 'warn' | 'info' | 'debug';/** From the top of a bar down: the stack is drawn the other way round. */export const LEVELS: Level[] = ['error', 'warn', 'info', 'debug'];export const LEVEL_LABEL: Record<Level, string> = {  error: 'Error',  warn: 'Warn',  info: 'Info',  debug: 'Debug',

// Copyright (c) 2026 Bruno Delorence. MIT License./* * The explorer's icons: 24-unit line drawings in the text's colour, sized by the stylesheet * (the lab page would otherwise draw an unsized SVG at 16 px). All are decorative: the buttons * that hold them carry their own names. */const PATHS = {  bot: 'M11.2 7.5V4.6h2.3M7.5 7.5h9a2 2 0 0 1 2 2v7a2 2 0 0 1-2 2h-9a2 2 0 0 1-2-2v-7a2 2 0 0 1 2-2ZM3.5 12v2.5M20.5 12v2.5M10 12.2v1.3M14 12.2v1.3',  home: 'M4.5 10.2 12 4l7.5 6.2V19a1 1 0 0 1-1 1h-13a1 1 0 0 1-1-1ZM12 12.6a1.7 1.7 0 1 0 0 3.4 1.7 1.7 0 0 0 0-3.4Z',  sparkle:    'M10 4.5c.5 3.3 1.9 4.8 5.2 5.3-3.3.5-4.7 2-5.2 5.2-.5-3.2-2-4.7-5.2-5.2 3.2-.5 4.7-2 5.2-5.3ZM17.5 14.5v5M15 17h5',  globe:    'M12 3.8a8.2 8.2 0 1 0 0 16.4 8.2 8.2 0 0 0 0-16.4ZM3.8 12h16.4M12 3.8c2.2 2.3 3.2 5 3.2 8.2s-1 5.9-3.2 8.2c-2.2-2.3-3.2-5-3.2-8.2s1-5.9 3.2-8.2Z',  server:    'M6 4.5h12A1.5 1.5 0 0 1 19.5 6v3a1.5 1.5 0 0 1-1.5 1.5H6A1.5 1.5 0 0 1 4.5 9V6A1.5 1.5 0 0 1 6 4.5ZM6 13.5h12a1.5 1.5 0 0 1 1.5 1.5v3a1.5 1.5 0 0 1-1.5 1.5H6A1.5 1.5 0 0 1 4.5 18v-3A1.5 1.5 0 0 1 6 13.5ZM8 7.5h.01M8 16.5h.01',  gauge: 'M4.6 16.5a8 8 0 1 1 14.8 0M12 13l3.2-3.6',  logs: 'M4.5 6.5h15M4.5 11h8M4.5 15.5h6M15.7 17.6a2.6 2.6 0 1 0 0-5.2 2.6 2.6 0 0 0 0 5.2ZM17.6 16.9l2.4 2.4',  grid: 'M5 4.5h4.5a.5.5 0 0 1 .5.5v6.5a.5.5 0 0 1-.5.5H5a.5.5 0 0 1-.5-.5V5a.5.5 0 0 1 .5-.5ZM14.5 4.5H19a.5.5 0 0 1 .5.5v3a.5.5 0 0 1-.5.5h-4.5a.5.5 0 0 1-.5-.5V5a.5.5 0 0 1 .5-.5ZM14.5 11.5H19a.5.5 0 0 1 .5.5v7a.5.5 0 0 1-.5.5h-4.5a.5.5 0 0 1-.5-.5v-7a.5.5 0 0 1 .5-.5ZM5 15h4.5a.5.5 0 0 1 .5.5V19a.5.5 0 0 1-.5.5H5a.5.5 0 0 1-.5-.5v-3.5A.5.5 0 0 1 5 15Z',  database:    'M12 4c3.9 0 7 1.1 7 2.5S15.9 9 12 9 5 7.9 5 6.5 8.1 4 12 4ZM5 6.5v11C5 18.9 8.1 20 12 20s7-1.1 7-2.5v-11M5 12c0 1.4 3.1 2.5 7 2.5s7-1.1 7-2.5',  bell: 'M6.5 16.5V11a5.5 5.5 0 0 1 11 0v5.5l1.5 1.5H5ZM10 20.5h4',  flame:

// Copyright (c) 2026 Bruno Delorence. MIT License.'use client';import type { CSSProperties, Ref } from 'react';/* * The demo's pointer, and the steps that move it. A demo is a script of awaited steps: wait, or * glide the pointer somewhere. Stopping the demo (the reader takes over, or it scrolls away) ends * the step in progress at once: its promise rejects, which ends the script right there, and the * pointer fades out. * * Each glide is a curved flight played by the Web Animations API, so nothing runs frame by frame. * The points of the flight are handed to whoever wants to move along with it. The arrow and the * hand are HTML boxes that swap by their visibility: a change of style inside an SVG would lay the * SVG out again. */export type Point = { x: number; y: number };/** A glide's path and timing, for an animation that plays along with it. */export type Flight = { points: Point[]; timing: KeyframeAnimationOptions };export type Demo = {

// Copyright (c) 2026 Bruno Delorence. MIT License.'use client';import { useCallback, useEffect, useRef, useState } from 'react';/* * When a demo may play on its own: while part of it is on screen and the tab is visible, never * under reduced motion, and not while the reader is using it. `take()` hands it to the reader; it * takes back over `idle` ms after their last input (never, for an infinite `idle`). `visible` and * `reduced` are handed out too: the live stream runs while the screen is visible, whoever drives * it. */export function useAutoplay<T extends HTMLElement>(idle = 6000) {  const ref = useRef<T>(null);  const [visible, setVisible] = useState(false);  const [reduced, setReduced] = useState(true);  const [taken, setTaken] = useState(false);  const timer = useRef(0);  useEffect(() => {    const element = ref.current;    if (!element) return;    let onScreen = false;

/* Logs explorer (logs-explorer.tsx): a frosted frame on a soft colour field, holding an icon rail,   a near-black panel (white by day) with the query, the histogram and the lines, and the details   of a line on the frame's own glass.   Sizes are the screen's own px; the frame's height follows the component's width between 640   and 824 px. The layout (data-layout, set from the component's width) puts the details in a   column of their own from 1100 px, over the list below that, and hides the rail under 720 px.   Colours are the tokens below, light-dark(light, dark) where the two differ: the component takes   the color-scheme it inherits from the page (light unless the page says otherwise), or the one   its colorScheme prop sets (data-color-scheme).   Memory. The root is a layout boundary; the bars and the rows move by transforms, the bars'   heights are transforms under a clip-path, and the colour field is one painted background, so   the live stream never lays the page out or repaints it. */.root {  --sans: Inter, ui-sans-serif, system-ui, -apple-system, 'Segoe UI', sans-serif;  --mono: 'IBM Plex Mono', JetBrains, ui-monospace, 'SF Mono', Menlo, Consolas, monospace;  /* The colour field behind the frame. */  --field-a: #ffc9a1;  --field-b: #e4e3a6;  --field-c: #ffb994;  --field-d: #9cc3ff;