nvim: configure latex formatting options and completion model

dot_config/nvim/ftplugin/tex.lua

@@ -9,3 +9,16 @@ vim.opt_local.spelllang = { "en_gb", "de_de", "fr" }
 vim.opt_local.wrap = true
 vim.opt_local.linebreak = true
 vim.opt_local.textwidth = 0 -- don't hard-wrap LaTeX
+
+-- Normalize display-math delimiters: $$ … $$ → \[ … \] on every save.
+-- Uses a unique augroup per buffer to avoid double-registration on :edit.
+vim.api.nvim_create_autocmd("BufWritePre", {
+  buffer = 0,
+  group = vim.api.nvim_create_augroup("user_tex_normalize_math_" .. vim.api.nvim_get_current_buf(), { clear = true }),
+  callback = function()
+    local view = vim.fn.winsaveview()
+    vim.cmd([[silent! keeppatterns %s/\v\$\$(\_.{-})\$\$/\\[\1\\]/g]])
+    vim.fn.winrestview(view)
+  end,
+})
+