Lint sublists in list-item (#77)

* Lint sublists in `list-item`

* Improve code structure and tests

* Use `unist-util-visit` instead of custom method

Author: itaisteinherz

rules/list-item.js

@@ -65,7 +65,7 @@ module.exports = rule('remark-lint:awesome/list-item', (ast, file) => {
 			return;
 		}
 
-		lists = findAllAfter(ast, postContentsHeading, {type: 'list'});
+		lists = extractSublists(findAllAfter(ast, postContentsHeading, {type: 'list'}));
 	}
 
 	for (const list of lists) {
@@ -81,6 +81,16 @@ function findAllLists(ast) {
 	return lists;
 }
 
+function extractSublists(lists) {
+	let allLists = [];
+
+	for (const list of lists) {
+		allLists = [...allLists, ...findAllLists(list)];
+	}
+
+	return allLists;
+}
+
 function validateList(list, file) {
 	for (const listItem of list.children) {
 		const [paragraph] = listItem.children;

test/fixtures/list-item/3.md

@@ -0,0 +1,12 @@
+# Awesome Nest
+
+## Contents
+
+- [Resources](#resources)
+
+## Resources
+
+- Tutorials
+  - [Nestjs30Days](https://github.com/m24927605/Nestjs30Days) - Learn the Nestjs framework in 30 days
+  - Unicorns are awesome.
+  - [foo]() - Invalid url.

test/rules/list-item.js

@@ -18,6 +18,11 @@ test('list-item - invalid', async t => {
 	t.snapshot(messages);
 });
 
+test('list-item - invalid sublist punctuation', async t => {
+	const messages = await lint({config, filename: 'test/fixtures/list-item/3.md'});
+	t.snapshot(messages);
+});
+
 test('list-item - valid ignoring Contents section', async t => {
 	const messages = await lint({config, filename: 'test/fixtures/list-item/2.md'});
 	t.deepEqual(messages, []);

test/rules/snapshots/list-item.js.md

@@ -62,3 +62,18 @@ Generated by [AVA](https://ava.li).
         ruleId: 'awesome/list-item',
       },
     ]
+
+## list-item - invalid sublist punctuation
+
+> Snapshot 1
+
+    [
+      {
+        message: 'List item description must end with proper punctuation',
+        ruleId: 'awesome/list-item',
+      },
+      {
+        message: 'Invalid list item link URL',
+        ruleId: 'awesome/list-item',
+      },
+    ]