refactor: centralize group sender identity

src/auto-reply/reply/inbound-sender-meta.test.ts

@@ -0,0 +1,41 @@
+import { describe, expect, it } from "vitest";
+
+import type { MsgContext } from "../templating.js";
+import { formatInboundBodyWithSenderMeta } from "./inbound-sender-meta.js";
+
+describe("formatInboundBodyWithSenderMeta", () => {
+  it("does nothing for direct messages", () => {
+    const ctx: MsgContext = { ChatType: "direct", SenderName: "Alice", SenderId: "A1" };
+    expect(formatInboundBodyWithSenderMeta({ ctx, body: "[X] hi" })).toBe("[X] hi");
+  });
+
+  it("appends a sender meta line for non-direct messages", () => {
+    const ctx: MsgContext = { ChatType: "group", SenderName: "Alice", SenderId: "A1" };
+    expect(formatInboundBodyWithSenderMeta({ ctx, body: "[X] hi" })).toBe("[X] hi\n[from: Alice (A1)]");
+  });
+
+  it("prefers SenderE164 in the label when present", () => {
+    const ctx: MsgContext = {
+      ChatType: "group",
+      SenderName: "Bob",
+      SenderId: "bob@s.whatsapp.net",
+      SenderE164: "+222",
+    };
+    expect(formatInboundBodyWithSenderMeta({ ctx, body: "[X] hi" })).toBe("[X] hi\n[from: Bob (+222)]");
+  });
+
+  it("preserves escaped newline style when body uses literal \\\\n", () => {
+    const ctx: MsgContext = { ChatType: "group", SenderName: "Bob", SenderId: "+222" };
+    expect(formatInboundBodyWithSenderMeta({ ctx, body: "[X] one\\n[X] two" })).toBe(
+      "[X] one\\n[X] two\\n[from: Bob (+222)]",
+    );
+  });
+
+  it("does not duplicate a sender meta line when one is already present", () => {
+    const ctx: MsgContext = { ChatType: "group", SenderName: "Alice", SenderId: "A1" };
+    expect(formatInboundBodyWithSenderMeta({ ctx, body: "[X] hi\n[from: Alice (A1)]" })).toBe(
+      "[X] hi\n[from: Alice (A1)]",
+    );
+  });
+});
+