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import { readFileSync, writeFileSync, mkdirSync } from "node:fs";
import { homedir } from "node:os";
import { join } from "node:path";
import type { ExtensionAPI } from "@earendil-works/pi-coding-agent";
const HISTORY_FILE = join(homedir(), ".pi", "prompt-history.json");
const MAX_ENTRIES = 500;
// Load persisted history from disk. Returns entries newest-first.
function loadHistory(): string[] {
try {
const raw = readFileSync(HISTORY_FILE, "utf8");
const parsed = JSON.parse(raw);
return Array.isArray(parsed) ? parsed : [];
} catch {
return [];
}
}
// Persist history to disk, capping at MAX_ENTRIES.
function saveHistory(entries: string[]): void {
try {
mkdirSync(join(homedir(), ".pi"), { recursive: true });
const capped = entries.slice(0, MAX_ENTRIES);
writeFileSync(HISTORY_FILE, JSON.stringify(capped, null, 2), "utf8");
} catch {
// Best-effort: don't crash the agent on a write failure.
}
}
export default function promptHistoryExtension(pi: ExtensionAPI): void {
// Capture every submitted prompt and append it to the persistent history file.
pi.on("before_agent_start", async (event, _ctx) => {
const text = event.prompt.trim();
if (!text) return;
const current = loadHistory();
// Avoid duplicating the most recent entry.
if (current[0] === text) return;
saveHistory([text, ...current]);
});
}
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