refactor: Handle buffer_filetype as local

Author: andrewferrier

lua/debugprint/highlight.lua

@@ -27,10 +27,12 @@ M.setup_highlight = function(print_tag)
 
     vim.api.nvim_create_autocmd({ "BufRead", "BufNewFile" }, {
         callback = function(opts)
+            local buffer_filetype = vim.bo[opts.buf].filetype
+
             -- Automatically ignore 'bigfiles' as detected by snacks' bigfile
             -- support:
             -- https://github.com/folke/snacks.nvim/blob/main/docs/bigfile.md
-            if vim.bo[opts.buf].filetype ~= "bigfile" then
+            if buffer_filetype ~= "bigfile" then
                 setup_highlight_buffer(print_tag, opts.buf)
             end
         end,