From f0c365dca8edc8f66a4bf9bba159ce07bed48a10 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?David=20Ord=C3=A1s?=
 <3125580+davorpa@users.noreply.github.com>
Date: Fri, 11 Feb 2022 23:14:07 +0100
Subject: [PATCH] strip LTM and RTM entities when normalize text

To support bidirectional text alphabetization (https://en.wikipedia.org/wiki/Bidirectional_text)

Via https://github.com/EbookFoundation/free-programming-books/issues/6714
---
 lib/alphabetical-list-items.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/alphabetical-list-items.js b/lib/alphabetical-list-items.js
index 661d1e0..f56de85 100644
--- a/lib/alphabetical-list-items.js
+++ b/lib/alphabetical-list-items.js
@@ -3,8 +3,8 @@ const visit = require('unist-util-visit');
 const toString = require('mdast-util-to-string');
 
 function normalize(text) {
-  const removeAtBeginning = /^([-._(《"'])*/;
-  const removeInside = /[,:]/;
+  const removeAtBeginning = /^([-._(《"'\u200e\u200f])*/;
+  const removeInside = /[,:\u200e\u200f]/;
   const replaceWithSpace = /-/;
   return text.toLowerCase()
     .trim()