From b2e48245261effcb296de7d3b23a69775a6c4e3f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marcel=20Fabian=20Kr=C3=BCger?= <tex@2krueger.de>
Date: Tue, 27 Apr 2021 03:30:08 +0200
Subject: [PATCH] Support alignat

---
 luamml-amsmath.lua | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/luamml-amsmath.lua b/luamml-amsmath.lua
index e383d12..892b656 100644
--- a/luamml-amsmath.lua
+++ b/luamml-amsmath.lua
@@ -70,7 +70,11 @@ lua.get_functions_table()[funcid] = function()
   if not mml_table then return end
   local columns = node.count(node.id'align_record', tex.lists.align_head)//2
   mml_table.columnalign = string.rep('right left', columns, ' ')
-  mml_table.columnspacing = string.rep('0', columns, ' 0.8em ') -- FIXME: 0.3em is a hack needed since MathML doesn't add spacing for our empty mrow
+  local spacing = {}
+  for n in node.traverse_id(node.id'glue', tex.lists.align_head) do
+    spacing[#spacing+1] = n.width == 0 and '0' or '.8em'
+  end
+  mml_table.columnspacing = table.concat(spacing, ' ', 2, #spacing-2)
   save_result(mml_table, 0)
 end