Performance boost by caching is_math state in Markdown.

Author: mscott99

lua/luasnip-latex-snippets/util/ts_utils.lua

@@ -49,7 +49,7 @@ function M.in_text(check_parent)
   return true
 end
 
-function M.in_mathzone()
+local function check_in_mathzone()
   local node = get_node_at_cursor()
   while node do
     if node:type() == "text_mode" then
@@ -62,4 +62,21 @@ function M.in_mathzone()
   return false
 end
 
+vim.api.nvim_create_autocmd({"BufEnter", "BufWinEnter"},
+  {pattern = {"*.md"},
+  callback = function()
+    if not vim.b.tracking_math then
+      vim.api.nvim_buf_attach(0, false, {on_lines = function(...)
+        vim.b.in_mathzone = check_in_mathzone()
+      end})
+    vim.b.in_mathzone = false
+    vim.b.tracking_math = true
+    end
+  end
+  })
+
+function M.in_mathzone()
+  return vim.b.in_mathzone
+end
+
 return M