feat(host): workspace index infrastructure behind an opt-in switch

apps/desktop/electron/main/ipc/session-ipc.ts

@@ -310,6 +310,22 @@ export function registerSessionIpc({
       };
     },
   );
+
+  handle(IPC.invoke.indexStatus, async (input?: { rootPath?: string }) => {
+    if (!host) throw Object.assign(new Error("host unavailable"), { errorCode: "HOST_UNAVAILABLE" });
+    return host.call("index.status", input ?? {});
+  });
+
+  handle(IPC.invoke.indexRebuild, async (input?: { rootPath?: string }) => {
+    if (!host) throw Object.assign(new Error("host unavailable"), { errorCode: "HOST_UNAVAILABLE" });
+    return host.call("index.rebuild", input ?? {});
+  });
+
+  handle(IPC.invoke.indexClear, async (input?: { rootPath?: string }) => {
+    if (!host) throw Object.assign(new Error("host unavailable"), { errorCode: "HOST_UNAVAILABLE" });
+    return host.call("index.clear", input ?? {});
+  });
+
   handle(
     IPC.invoke.sessionGet,
     async (

apps/desktop/src/components/settings/IndexPage.tsx

@@ -0,0 +1,344 @@
+import { useCallback, useEffect, useState } from "react";
+import { useTranslation } from "react-i18next";
+import type { AppSettings, WorkspaceIndexRoot } from "@pi-desktop/shared";
+import { api } from "../../lib/api";
+import { Button, cx } from "../ui";
+import { MetricTile } from "./MetricTile";
+import {
+  IconActivity,
+  IconDatabase,
+  IconFileText,
+  IconRefresh,
+} from "../icons";
+
+type IndexPageProps = {
+  settings: AppSettings;
+  saveSettings: (patch: Partial<AppSettings>) => Promise<void>;
+};
+
+type LoadState =
+  | { kind: "loading" }
+  | { kind: "error" }
+  | { kind: "ready"; root: WorkspaceIndexRoot | null };
+
+/** localStorage flag for the one-time local-only nudge under the index page. */
+const NUDGE_DISMISSED_KEY = "pi.index.nudgeDismissed.v1";
+
+function formatBytes(bytes: number): string {
+  if (bytes <= 0) return "0 B";
+  const units = ["B", "KB", "MB", "GB"];
+  const exponent = Math.min(
+    units.length - 1,
+    Math.floor(Math.log(bytes) / Math.log(1024)),
+  );
+  const value = bytes / 1024 ** exponent;
+  return `${value >= 100 || exponent === 0 ? Math.round(value) : value.toFixed(1)} ${units[exponent]}`;
+}
+
+function formatRelative(updatedAt: number): string {
+  if (updatedAt <= 0) return "—";
+  const deltaSeconds = Math.max(0, Math.round((Date.now() - updatedAt) / 1000));
+  if (deltaSeconds < 60) return `${deltaSeconds}s`;
+  if (deltaSeconds < 3600) return `${Math.floor(deltaSeconds / 60)}m`;
+  if (deltaSeconds < 86400) return `${Math.floor(deltaSeconds / 3600)}h`;
+  return `${Math.floor(deltaSeconds / 86400)}d`;
+}
+
+const STATUS_TONE: Record<WorkspaceIndexRoot["status"], string> = {
+  fresh: "ok",
+  building: "busy",
+  stale: "warn",
+  failed: "error",
+  partial: "warn",
+  disabled: "",
+  skipped_over_limit: "warn",
+};
+
+export function IndexPage({ settings, saveSettings }: IndexPageProps) {
+  const { t } = useTranslation();
+  const [state, setState] = useState<LoadState>({ kind: "loading" });
+  const [busy, setBusy] = useState<"rebuild" | "clear" | null>(null);
+  const [actionError, setActionError] = useState(false);
+  // One-time note: once dismissed it stays dismissed (localStorage), matching
+  // the audit's "never render again once written" requirement.
+  const [nudgeVisible, setNudgeVisible] = useState(() => {
+    try {
+      return localStorage.getItem(NUDGE_DISMISSED_KEY) !== "1";
+    } catch {
+      return true;
+    }
+  });
+  const grepBoost = settings.indexGrepBoost === true;
+  const building = state.kind === "ready" && state.root?.status === "building";
+
+  const dismissNudge = () => {
+    try {
+      localStorage.setItem(NUDGE_DISMISSED_KEY, "1");
+    } catch {
+      // Storage unavailable (e.g. locked-down profile): degrade to a
+      // session-only dismiss rather than blocking the control.
+    }
+    setNudgeVisible(false);
+  };
+
+  const refresh = useCallback(async () => {
+    setState((current) =>
+      current.kind === "ready" ? { kind: "ready", root: current.root } : { kind: "loading" },
+    );
+    try {
+      const result = await api.indexStatus();
+      setState({ kind: "ready", root: result.roots[0] ?? null });
+    } catch {
+      setState({ kind: "error" });
+    }
+  }, []);
+
+  useEffect(() => {
+    void refresh();
+  }, [refresh]);
+
+  // While a background rebuild is in flight, poll once a second — paused
+  // whenever the window is hidden, and torn down with the page.
+  useEffect(() => {
+    if (!building) return;
+    const poll = () => {
+      if (document.visibilityState !== "visible") return;
+      void api.indexStatus().then((result) => {
+        const next = result.roots[0];
+        if (next) setState({ kind: "ready", root: next });
+      });
+    };
+    const timer = setInterval(poll, 1000);
+    return () => clearInterval(timer);
+  }, [building]);
+
+  const rebuild = async () => {
+    if (busy) return;
+    setBusy("rebuild");
+    setActionError(false);
+    try {
+      const result = await api.indexRebuild();
+      setState({ kind: "ready", root: result.root });
+    } catch {
+      setActionError(true);
+      void refresh();
+    } finally {
+      setBusy(null);
+    }
+  };
+
+  const clear = async () => {
+    if (busy) return;
+    setBusy("clear");
+    setActionError(false);
+    try {
+      await api.indexClear();
+      setState({ kind: "ready", root: null });
+    } catch {
+      setActionError(true);
+      void refresh();
+    } finally {
+      setBusy(null);
+    }
+  };
+
+  if (state.kind === "loading") {
+    return (
+      <div className="settings-stack" role="status">
+        <span className="idx-state">{t("index.loading")}</span>
+      </div>
+    );
+  }
+
+  if (state.kind === "error") {
+    return (
+      <div className="settings-stack">
+        <section className="settings-card-block">
+          <div className="settings-panel">
+            <div className="settings-row">
+              <div className="settings-row-copy">
+                <div className="settings-row-title">{t("index.loadErrorTitle")}</div>
+                <div className="settings-row-desc">{t("index.loadErrorDesc")}</div>
+              </div>
+              <div className="settings-row-control">
+                <Button onClick={() => void refresh()}>{t("index.retry")}</Button>
+              </div>
+            </div>
+          </div>
+        </section>
+      </div>
+    );
+  }
+
+  const { root } = state;
+  const progress = root?.status === "building" ? root.progress : undefined;
+  const progressPct =
+    progress && progress.filesTotal > 0
+      ? Math.min(100, Math.max(0, Math.round((progress.filesDone / progress.filesTotal) * 100)))
+      : 0;
+
+  return (
+    <div className="settings-stack">
+      {/* Sits directly under the page title the settings shell renders. */}
+      <p className="idx-subtitle">{t("index.indexSubtitle")}</p>
+
+      <section className="settings-card-block">
+        <h3 className="settings-card-heading">{t("index.card.health")}</h3>
+        <div className="settings-panel">
+          {building ? (
+            <div className="idx-progress" role="status">
+              {progress ? (
+                <>
+                  <span className="idx-progress-bar" aria-hidden="true">
+                    <span className="idx-progress-fill" style={{ width: `${progressPct}%` }} />
+                  </span>
+                  <span className="idx-progress-count">
+                    {t("index.progressFiles", {
+                      done: progress.filesDone.toLocaleString(),
+                      total: progress.filesTotal.toLocaleString(),
+                    })}
+                  </span>
+                </>
+              ) : (
+                // Host gave no counts: an indeterminate busy pill instead of a
+                // fake bar, reusing the status language of the tiles below.
+                <span className="idx-status busy">{t("index.status.building")}</span>
+              )}
+              <span className="idx-progress-note">{t("index.progressFallback")}</span>
+            </div>
+          ) : null}
+          {root ? (
+            <div className="idx-grid">
+              <MetricTile
+                icon={<IconActivity size={14} />}
+                tone={root.status === "fresh" ? "success" : root.status === "failed" ? "danger" : "warning"}
+                label={t("index.card.status")}
+                value={
+                  <span className={cx("idx-status", STATUS_TONE[root.status])}>
+                    {t(`index.status.${root.status}`)}
+                  </span>
+                }
+                caption={t("index.statusDesc")}
+              />
+              <MetricTile
+                icon={<IconFileText size={14} />}
+                tone="accent"
+                label={t("index.card.files")}
+                value={root.fileCount.toLocaleString()}
+                badge={
+                  root.errorCount > 0 ? (
+                    <span className="idx-badge idx-badge-warn">
+                      {t("index.card.errors")}: {root.errorCount}
+                    </span>
+                  ) : undefined
+                }
+              />
+              <MetricTile
+                icon={<IconDatabase size={14} />}
+                tone="accent"
+                label={t("index.card.size")}
+                value={formatBytes(root.indexedBytes)}
+              />
+              <MetricTile
+                icon={<IconRefresh size={14} />}
+                tone="accent"
+                label={t("index.card.updated")}
+                value={formatRelative(root.updatedAt)}
+              />
+            </div>
+          ) : (
+            <div className="settings-row">
+              <div className="settings-row-copy">
+                <div className="settings-row-title">{t("index.emptyTitle")}</div>
+                <div className="settings-row-desc">{t("index.emptyDesc")}</div>
+              </div>
+            </div>
+          )}
+          {root && root.errorCount > 0 && root.lastError ? (
+            <div className="idx-error-line" role="status">
+              {root.lastError}
+            </div>
+          ) : null}
+          <div className="settings-row">
+            <div className="settings-row-copy">
+              <div className="settings-row-title">{t("index.actions")}</div>
+              <div className="settings-row-desc" id="idx-actions-desc">
+                {t("index.actionsDesc")} {t("index.localOnly")}
+              </div>
+            </div>
+            <div className="settings-row-control idx-actions">
+              <Button
+                variant="primary"
+                // Building while the switch is off would only scan the
+                // workspace and take up disk for an index nothing uses.
+                // The reason sits in the row's own description, not a tooltip:
+                // disabled controls do not fire the hover that would show one.
+                disabled={busy !== null || !grepBoost}
+                aria-busy={busy === "rebuild"}
+                aria-describedby="idx-actions-desc"
+                onClick={() => void rebuild()}
+              >
+                <IconDatabase size={14} />
+                {busy === "rebuild" ? t("index.rebuilding") : root ? t("index.action.rebuild") : t("index.action.build")}
+              </Button>
+              <Button
+                disabled={busy !== null || !root}
+                onClick={() => void clear()}
+              >
+                {busy === "clear" ? t("index.clearing") : t("index.action.clear")}
+              </Button>
+            </div>
+          </div>
+          {actionError ? (
+            <div className="idx-error-line" role="status">
+              {t("index.actionError")}
+            </div>
+          ) : null}
+        </div>
+      </section>
+
+      {/*
+        The behaviour switch gets its own "Codebase" section: it is a setting,
+        not health telemetry, and the audit flagged it sitting wordlessly
+        inside the health card.
+      */}
+      <section className="settings-card-block">
+        <h3 className="settings-card-heading">{t("index.sectionCode")}</h3>
+        <div className="settings-panel">
+          <div className="settings-row">
+            <div className="settings-row-copy">
+              <div className="idx-row-title">
+                <span className="idx-chip idx-chip-accent" aria-hidden="true">
+                  <IconDatabase size={14} />
+                </span>
+                <span className="settings-row-title">{t("index.grepBoost")}</span>
+              </div>
+              <div className="settings-row-desc">{t("index.grepBoostDesc")}</div>
+            </div>
+            <div className="settings-row-control">
+              <button
+                type="button"
+                className={cx("settings-toggle", grepBoost && "on")}
+                role="switch"
+                aria-checked={grepBoost}
+                aria-label={t("index.grepBoost")}
+                onClick={() => void saveSettings({ indexGrepBoost: !grepBoost })}
+              >
+                <span className="settings-toggle-thumb" />
+              </button>
+            </div>
+          </div>
+        </div>
+      </section>
+
+      {nudgeVisible ? (
+        <div className="idx-nudge" role="note">
+          <span className="idx-nudge-text">{t("index.nudgeText")}</span>
+          <Button variant="ghost" onClick={dismissNudge}>
+            {t("index.nudgeDismiss")}
+          </Button>
+        </div>
+      ) : null}
+    </div>
+  );
+}