added latex support and reorg ftplugins

lua/config/autocmds.lua

@@ -64,3 +64,29 @@ vim.cmd([[
   autocmd TermOpen * tnoremap <Esc> <C-\><C-n>
 ]])
 
+-- Open PDF in the background when a .tex file is opened
+vim.api.nvim_create_autocmd("BufEnter", {
+  pattern = "*.tex",
+  callback = function()
+    -- Construct an absolute path to the PDF file
+    local pdf_path = vim.fn.expand('%:p:h') .. "/output/" .. vim.fn.expand('%:t:r') .. '.pdf'
+    if vim.fn.filereadable(pdf_path) == 1 then
+      -- Start Zathura asynchronously in the background with an absolute path
+      vim.fn.jobstart({ 'nohup', 'zathura', pdf_path, '>/dev/null', '2>&1', '&' }, { detach = true })
+    else
+      print("PDF file not found: " .. pdf_path)
+    end
+  end,
+})
+
+-- Close Zathura gracefully when leaving Neovim
+vim.api.nvim_create_autocmd("VimLeavePre", {
+  callback = function()
+    -- Attempt to terminate Zathura gracefully with a grace period
+    vim.fn.system({ 'pkill', '-TERM', '-f', 'zathura' })
+    vim.defer_fn(function()
+      vim.fn.system({ 'pkill', '-KILL', '-f', 'zathura' })
+    end, 2000) -- Wait for 2 seconds before force killing if necessary
+  end,
+})
+