Fix task list style (#13)

Author: hyrious

fixture.md

@@ -1733,3 +1733,7 @@ Hr's:
 -oldCode()
 +newCode()
 ```
+
+footnotes[^1].
+
+[^1]: hello world!.

index.js

@@ -96,6 +96,7 @@ const ALLOW_TAGS = new Set([
 	'body',
 	'html',
 	'g-emoji',
+	'input', // [type=checkbox], for task list
 ]);
 
 const ALLOW_CLASS = new Set([
@@ -104,6 +105,9 @@ const ALLOW_CLASS = new Set([
 	'.highlight',
 	'.octicon',
 	'.octicon-link',
+	'.contains-task-list',
+	'.task-list-item',
+	'.task-list-item-checkbox',
 ]);
 
 function extractStyles(styles, ast) {
@@ -134,14 +138,29 @@ function extractStyles(styles, ast) {
 			return true;
 		}
 
+		const klass = selector.match(/^\.[-\w]+/);
+		if (klass) {
+			return ALLOW_CLASS.has(klass[0]);
+		}
+
 		return false;
 	}
 
+	function fix(selector) {
+		if (selector.startsWith('html ') || selector.startsWith('body ')) {
+			return selector.slice(5);
+		}
+
+		return selector;
+	}
+
 	for (const rule of walkRules(ast)) {
 		if (rule.declarations.some(({value}) => value.includes('prettylights'))) {
 			styles.push(rule);
 		} else {
-			rule.selectors = rule.selectors.filter(selector => select(selector));
+			rule.selectors = rule.selectors
+				.filter(selector => select(selector))
+				.map(selector => fix(selector));
 			if (rule.selectors.length > 0) {
 				styles.push(rule);
 			}
@@ -259,7 +278,12 @@ async function getCSS({light = 'light', dark = 'dark', list = false} = {}) {
 	let rules = [];
 
 	for (const [url, cssText] of zip(links, contents)) {
-		const [name] = url.match(/(?<=\/)\w+(?=-\w+\.css$)/);
+		const match = url.match(/(?<=\/)\w+(?=-\w+\.css$)/);
+		if (!match) {
+			continue;
+		}
+
+		const [name] = match;
 		const ast = css.parse(cssText);
 
 		if (/^(light|dark)/.test(name)) {

package.json

@@ -43,6 +43,6 @@
 		"meow": "^10.1.1"
 	},
 	"devDependencies": {
-		"xo": "^0.45.0"
+		"xo": "^0.46.4"
 	}
 }