Tighten markdown list spacing

packages/app/src/utils/markdown-list.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it } from "vitest";
-import { getMarkdownListMarker } from "./markdown-list";
+import { getMarkdownListMarker, getMarkdownListSpacing } from "./markdown-list";
 
 describe("getMarkdownListMarker", () => {
   it("returns a bullet marker for unordered list items", () => {
@@ -39,3 +39,49 @@ describe("getMarkdownListMarker", () => {
     });
   });
 });
+
+describe("getMarkdownListSpacing", () => {
+  it("keeps top-level list spacing as a section boundary", () => {
+    const paragraph = { type: "paragraph" };
+    const list = { type: "bullet_list" };
+    const body = { type: "body", children: [list, paragraph] };
+
+    expect(getMarkdownListSpacing(list, [body])).toEqual({
+      marginTop: 4,
+      marginBottom: 16,
+    });
+  });
+
+  it("does not add bottom spacing after a list at the end of a markdown block", () => {
+    const list = { type: "bullet_list" };
+    const body = { type: "body", children: [list] };
+
+    expect(getMarkdownListSpacing(list, [body])).toEqual({
+      marginTop: 4,
+      marginBottom: 0,
+    });
+  });
+
+  it("uses a smaller gap between adjacent top-level lists", () => {
+    const list = { type: "bullet_list" };
+    const body = { type: "body", children: [list, { type: "ordered_list" }] };
+
+    expect(getMarkdownListSpacing(list, [body])).toEqual({
+      marginTop: 4,
+      marginBottom: 8,
+    });
+  });
+
+  it("does not add section spacing after a nested list", () => {
+    expect(
+      getMarkdownListSpacing({ type: "bullet_list" }, [
+        { type: "list_item" },
+        { type: "bullet_list" },
+        { type: "body" },
+      ]),
+    ).toEqual({
+      marginTop: 4,
+      marginBottom: 0,
+    });
+  });
+});