CodeGraph

tcmts.share.CodeGraph · #uq36zhsq · component · runs in the browser

uses useState

The front page's graph: the codebase as clouds (CodeMap, made on the server), drawn by mountCodeMap, grouped by how its definitions reference each other or by namespace, coloured by cloud or by where the code runs, with a finder for a definition and, beside it, what's chosen (#vndg6a3a).

import { codeMap, CodeMapPanel, mountCodeMap, Place } from "#codebase/tcmts/share";
import type { CodeMap, CodeMapView, MapFocus } from "#codebase/tcmts/share";
import { useEffect, useMemo, useRef, useState } from "react";
import {
  Button, ComboBox, Input, ListBox, ListBoxItem, Popover, ToggleButton, ToggleButtonGroup,
} from "react-aria-components";

export function CodeGraph({ under = "" }: { under?: string }) {
  const [map, setMap] = useState<CodeMap | null>(null);
  const [failed, setFailed] = useState("");
  const [lens, setLens] = useState<"clusters" | "namespaces">("clusters");
  const [color, setColor] = useState<"cloud" | "place">("cloud");
  const [focus, setFocus] = useState<MapFocus | null>(null);
  const [q, setQ] = useState("");
  const canvas = useRef<HTMLCanvasElement>(null);
  const tip = useRef<HTMLDivElement>(null);
  const zoom = useRef<HTMLSpanElement>(null);
  const view = useRef<CodeMapView | null>(null);
  useEffect(() => {
    let live = true;
    codeMap(under).then(
      (m) => live && setMap(m),
      (e: unknown) => live && setFailed(e instanceof Error ? e.message : String(e)),
    );
    return () => {
      live = false;
    };
  }, [under]);
  useEffect(() => {
    if (!map || !canvas.current || !tip.current) return;
    const v = mountCodeMap(canvas.current, map, {
      lens,
      color,
      tip: tip.current,
      onSelect: setFocus,
      onZoom: (k) => {
        if (zoom.current) zoom.current.textContent = `${Math.round(k * 100)}%`;
      },
    });
    view.current = v;
    return () => v.destroy();
    // (the grouping and colouring it starts with: changes after are told to it)
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [map]);
  const pick = (f: MapFocus) => {
    view.current?.select(f);
    view.current?.show(f);
  };
  const hits = useMemo(() => {
    const t = q.trim().toLowerCase();
    if (!map || t.length < 2) return [];
    const leaf = (p: string) => p.slice(p.lastIndexOf(".") + 1).toLowerCase();
    return [...map.dots.entries()]
      .filter(([, d]) => d.path.toLowerCase().includes(t))
      .sort(([, a], [, b]) => Number(!leaf(a.path).startsWith(t)) - Number(!leaf(b.path).startsWith(t)) || a.path.length - b.path.length)
      .slice(0, 8)
      .map(([j, d]) => ({ id: j, path: d.path }));
  }, [map, q]);
  return (
    <div className="codemap">
      <div className="cmbar">
        <span className="cmgroup">
        <span className="muted">Group by</span>
        <ToggleButtonGroup
          aria-label="Group by"
          className="seg"
          selectionMode="single"
          disallowEmptySelection
          selectedKeys={[lens]}
          onSelectionChange={(keys) => {
            const next = keys.has("namespaces") ? "namespaces" : "clusters";
            setLens(next);
            view.current?.setLens(next);
          }}
        >
          <ToggleButton id="clusters" className="btn small">
            References
          </ToggleButton>
          <ToggleButton id="namespaces" className="btn small">
            Namespaces
          </ToggleButton>
        </ToggleButtonGroup>
        </span>
        <span className="cmgroup">
        <span className="muted">Colour</span>
        <ToggleButtonGroup
          aria-label="Colour by"
          className="seg"
          selectionMode="single"
          disallowEmptySelection
          selectedKeys={[color]}
          onSelectionChange={(keys) => {
            const next = keys.has("place") ? "place" : "cloud";
            setColor(next);
            view.current?.setColor(next);
          }}
        >
          <ToggleButton id="cloud" className="btn small">
            Cloud
          </ToggleButton>
          <ToggleButton id="place" className="btn small">
            Where it runs
          </ToggleButton>
        </ToggleButtonGroup>
        </span>
        {color === "place" && (
          <span className="legend">
            <Place place="server" /> server <Place place="anywhere" /> anywhere <Place place="browser" /> browser
          </span>
        )}
        <ComboBox
          aria-label="Find a definition in the map"
          className="cmfind right"
          inputValue={q}
          onInputChange={setQ}
          items={hits}
          menuTrigger="input"
          isDisabled={!map}
          onSelectionChange={(k) => {
            if (k === null || !map) return;
            setQ("");
            pick({ dot: Number(k), cloud: map[lens].cloud[Number(k)]! });
          }}
        >
          <Input className="field" placeholder="Find a definition…" />
          <Popover className="results" placement="bottom end" offset={6}>
            <ListBox className="result-list">
              {(h: { id: number; path: string }) => (
                <ListBoxItem id={h.id} textValue={h.path} className="result">
                  <b>{h.path.slice(h.path.lastIndexOf(".") + 1)}</b> <span className="muted">{h.path}</span>
                </ListBoxItem>
              )}
            </ListBox>
          </Popover>
        </ComboBox>
      </div>
      <div className="cmbody">
        <div className="cmcanvas">
          <canvas
            ref={canvas}
            tabIndex={0}
            onKeyDown={(e) => {
              if (e.key !== "Escape") return;
              view.current?.select(null);
              view.current?.fit();
            }}
            role="img"
            aria-label="The codebase as clouds: each definition a dot, grouped with what it references"
          />
          <div className="cmtip" ref={tip} hidden />
          {!map && <div className="cmwait muted">{failed ? `The map couldn't be made: ${failed}` : "Laying out the codebase…"}</div>}
          <div className="cmzoom">
            <Button aria-label="Zoom out" onPress={() => view.current?.zoomBy(1 / 1.4)}>
              −
            </Button>
            <span ref={zoom}>100%</span>
            <Button aria-label="Zoom in" onPress={() => view.current?.zoomBy(1.4)}>
              +
            </Button>
            <Button aria-label="Show it all" onPress={() => (view.current?.select(null), view.current?.fit())}>
              ⤢
            </Button>
          </div>
        </div>
        <aside className="cmside">
          {map ? <CodeMapPanel map={map} lens={lens} focus={focus} pick={pick} /> : <p className="muted">…</p>}
        </aside>
      </div>
    </div>
  );
}

uses

used by