Extract auto-reply helpers into modules

src/config/config.ts

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+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+
+import JSON5 from "json5";
+
+export type ReplyMode = "text" | "command";
+export type ClaudeOutputFormat = "text" | "json" | "stream-json";
+export type SessionScope = "per-sender" | "global";
+
+export type SessionConfig = {
+	scope?: SessionScope;
+	resetTriggers?: string[];
+	idleMinutes?: number;
+	store?: string;
+	sessionArgNew?: string[];
+	sessionArgResume?: string[];
+	sessionArgBeforeBody?: boolean;
+};
+
+export type WarelayConfig = {
+	inbound?: {
+		allowFrom?: string[]; // E.164 numbers allowed to trigger auto-reply (without whatsapp:)
+		reply?: {
+			mode: ReplyMode;
+			text?: string; // for mode=text, can contain {{Body}}
+			command?: string[]; // for mode=command, argv with templates
+			template?: string; // prepend template string when building command/prompt
+			timeoutSeconds?: number; // optional command timeout; defaults to 600s
+			bodyPrefix?: string; // optional string prepended to Body before templating
+			session?: SessionConfig;
+			claudeOutputFormat?: ClaudeOutputFormat; // when command starts with `claude`, force an output format
+		};
+	};
+};
+
+export const CONFIG_PATH = path.join(os.homedir(), ".warelay", "warelay.json");
+
+export function loadConfig(): WarelayConfig {
+	// Read ~/.warelay/warelay.json (JSON5) if present.
+	try {
+		if (!fs.existsSync(CONFIG_PATH)) return {};
+		const raw = fs.readFileSync(CONFIG_PATH, "utf-8");
+		const parsed = JSON5.parse(raw);
+		if (typeof parsed !== "object" || parsed === null) return {};
+		return parsed as WarelayConfig;
+	} catch (err) {
+		console.error(`Failed to read config at ${CONFIG_PATH}`, err);
+		return {};
+	}
+}

src/config/sessions.ts

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+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+
+import JSON5 from "json5";
+
+import { CONFIG_DIR, normalizeE164 } from "../utils.js";
+import type { MsgContext } from "../auto-reply/templating.js";
+
+export type SessionScope = "per-sender" | "global";
+
+export type SessionEntry = { sessionId: string; updatedAt: number };
+
+export const SESSION_STORE_DEFAULT = path.join(CONFIG_DIR, "sessions.json");
+export const DEFAULT_RESET_TRIGGER = "/new";
+export const DEFAULT_IDLE_MINUTES = 60;
+
+export function resolveStorePath(store?: string) {
+	if (!store) return SESSION_STORE_DEFAULT;
+	if (store.startsWith("~"))
+		return path.resolve(store.replace("~", os.homedir()));
+	return path.resolve(store);
+}
+
+export function loadSessionStore(storePath: string): Record<string, SessionEntry> {
+	try {
+		const raw = fs.readFileSync(storePath, "utf-8");
+		const parsed = JSON5.parse(raw);
+		if (parsed && typeof parsed === "object") {
+			return parsed as Record<string, SessionEntry>;
+		}
+	} catch {
+		// ignore missing/invalid store; we'll recreate it
+	}
+	return {};
+}
+
+export async function saveSessionStore(
+	storePath: string,
+	store: Record<string, SessionEntry>,
+) {
+	await fs.promises.mkdir(path.dirname(storePath), { recursive: true });
+	await fs.promises.writeFile(
+		storePath,
+		JSON.stringify(store, null, 2),
+		"utf-8",
+	);
+}
+
+export function deriveSessionKey(scope: SessionScope, ctx: MsgContext) {
+	if (scope === "global") return "global";
+	const from = ctx.From ? normalizeE164(ctx.From) : "";
+	return from || "unknown";
+}