refactor: add inbound context helpers

src/auto-reply/reply/inbound-text.test.ts

@@ -0,0 +1,19 @@
+import { describe, expect, it } from "vitest";
+
+import { normalizeInboundTextNewlines } from "./inbound-text.js";
+
+describe("normalizeInboundTextNewlines", () => {
+  it("keeps real newlines", () => {
+    expect(normalizeInboundTextNewlines("a\nb")).toBe("a\nb");
+  });
+
+  it("normalizes CRLF/CR to LF", () => {
+    expect(normalizeInboundTextNewlines("a\r\nb")).toBe("a\nb");
+    expect(normalizeInboundTextNewlines("a\rb")).toBe("a\nb");
+  });
+
+  it("decodes literal \\\\n to newlines when no real newlines exist", () => {
+    expect(normalizeInboundTextNewlines("a\\nb")).toBe("a\nb");
+  });
+});
+

src/auto-reply/reply/inbound-text.ts

@@ -0,0 +1,7 @@
+export function normalizeInboundTextNewlines(input: string): string {
+  const text = input.replaceAll("\r\n", "\n").replaceAll("\r", "\n");
+  if (text.includes("\n")) return text;
+  if (!text.includes("\\n")) return text;
+  return text.replaceAll("\\n", "\n");
+}
+