switched to lazy.nvim and clean up a bit

lua/config/preview.lua

@@ -1,17 +1,15 @@
-local u = require 'config.utils'
+local g = vim.api.nvim_create_augroup("preview", {})
 
-local g = vim.api.nvim_create_augroup('preview', {})
-
-vim.api.nvim_create_autocmd('BufWritePost', {
+vim.api.nvim_create_autocmd("BufWritePost", {
     group = g,
-    pattern = '*.tex',
+    pattern = "*.tex",
     callback = function(arg)
-        local dir = arg.file:match('.*/')
-        local args = ''
+        local dir = arg.file:match(".*/")
+        local args = ""
         if dir ~= nil then
-            args = '-output-directory=\''..dir..'\' '
+            args = "-output-directory='"..dir.."' "
         end
-        vim.cmd('silent exec "!pdflatex '..args..'\''..arg.file..'\'"')
+        vim.cmd("silent exec \"!pdflatex "..args.."'"..arg.file.."'\"")
     end
 })