HistoryPage

tcmts.share.HistoryPage · #zxusg4xg · term · runs on the server

is an async component

The history: a branch's entries by day, each with what it changed by name and count (an entry that re-hashed hundreds of definitions but edited four reads as small), under one namespace if asked.

import { historyList } from "#codebase/tcmts/cli/changes";
import type { HistoryItem } from "#codebase/tcmts/cli/changes";
import {
  ago, at, codeHref, entriesIn, EntryBadges, entrySummary, Frame, HistoryFilter, inSlices, shareNow,
} from "#codebase/tcmts/share";
import type { EntrySummary } from "#codebase/tcmts/share";
import { entryTitle } from "#codebase/tcmts/store";
import { Link } from "react-aria-components";

export async function HistoryPage({
  branch,
  under,
  page,
}: {
  branch: string;
  under: string;
  page: number;
}) {
  const s = shareNow();
  if (!s.signedIn) return <Frame tab="history" title="Sign in" children={null} />;
  const b = branch && s.cb.store.hasBranch(branch) ? branch : s.cb.store.branch().name;
  const per = 30;
  const all = historyList(s.cb, under ? 400 : (page + 1) * per + 1, b);
  const inside = (n: string) => n === under || n.startsWith(`${under}.`);
  const touches = (e: EntrySummary) =>
    [...e.edited, ...e.added, ...e.removed, ...e.renamed.map((r) => r.to)].some(inside);
  // (an entry whose names under it are all as they were can't have changed one: no need to tell how)
  const trees = s.cache.trees(s.cb);
  const near = (h: HistoryItem) =>
    trees
      .delta(s.cb.store.causal(h.parents[0]!)?.namespace, s.cb.store.causal(h.hash)!.namespace)
      .some((d) => inside(d.path));
  const matching = under ? [] : all;
  if (under)
    await inSlices(
      all.map((h) => () => near(h) && touches(entrySummary(s, h.hash)) && matching.push(h)),
    );
  const listed = matching.slice(page * per, page * per + per);
  await inSlices(listed.map((h) => () => entrySummary(s, h.hash)));
  const more = matching.length > (page + 1) * per;
  const days = new Map<string, typeof listed>();
  for (const h of listed) {
    const day = new Date(h.ts).toISOString().slice(0, 10);
    if (!days.has(day)) days.set(day, []);
    days.get(day)!.push(h);
  }
  const q = (p: number) =>
    at(
      `/history?${new URLSearchParams({ branch: b, ...(under ? { under } : {}), page: String(p) })}`,
    );
  return (
    <Frame tab="history" title="History">
      <div className="page cols-2">
        <div>
          <HistoryFilter branches={s.cb.store.branches()} branch={b} under={under} />
          <div className="muted" style={{ margin: "0 0 14px" }}>
            {under ? (
              <>
                Entries on <code>{b}</code> that change <code>{under}</code>
              </>
            ) : (
              <>
                {entriesIn(s, s.cb.store.head(b)).toLocaleString("en")} entries on <code>{b}</code>
              </>
            )}
          </div>
          {[...days].map(([day, entries]) => (
            <div className="box" key={day}>
              <div className="boxhead">
                <b>{day}</b>
              </div>
              {entries.map((h) => {
                const e = entrySummary(s, h.hash);
                const names = [...e.edited, ...e.added, ...e.removed];
                return (
                  <div className="hrow" key={h.hash}>
                    <a className="hash" href={at(`/history/${h.hash}`)}>
                      {h.short}
                    </a>
                    <div>
                      <a
                        href={at(`/history/${h.hash}`)}
                        style={{ color: "var(--fg)", overflowWrap: "anywhere" }}
                      >
                        <b>{entryTitle(h)}</b>
                      </a>
                      {h.parents.length > 1 && <span className="pill">merge</span>}
                      {h.message && <div className="muted">{h.command}</div>}
                      <div className="badges">
                        <EntryBadges e={e} />
                      </div>
                      {names.length > 0 && (
                        <div className="names">
                          {names.slice(0, 6).map((n, i) => (
                            <span key={n}>
                              {i > 0 && " · "}
                              <a href={codeHref(n)}>{n}</a>
                            </span>
                          ))}
                          {names.length > 6 && ` +${names.length - 6}`}
                        </div>
                      )}
                    </div>
                    <span className="when">{ago(h.ts)}</span>
                  </div>
                );
              })}
            </div>
          ))}
          {!listed.length && (
            <div className="empty">
              No entries{under ? ` change ${under} in the latest 400` : ""}.
            </div>
          )}
          <div className="filters">
            {page > 0 && (
              <Link className="btn" href={q(page - 1)}>
                ← Newer
              </Link>
            )}
            {more && (
              <Link className="btn" href={q(page + 1)}>
                Older →
              </Link>
            )}
          </div>
        </div>
        <aside className="side">
          <div className="sect">
            <h4>Reading history</h4>Each entry is one command that changed names: an update, a
            merge, a rename, called by its message where it was given one. A rename is a rename,
            never a delete and an add; reformatting is no change at all.
          </div>
          <div className="sect">
            <h4>Re-hashed</h4>
            <span className="badge b-prop">re-hashed</span> counts definitions that changed only
            because something they use did: there's nothing in them to read.
          </div>
          <div className="sect">
            <h4>Undo</h4>
            <code>tcm revert &lt;entry&gt;</code> takes one entry back, three-way, and nothing after
            it.
          </div>
        </aside>
      </div>
    </Frame>
  );
}

uses

used by