add autocmd file, add newline and whitespace trim commands

lua/crentist/autocmd.lua

@@ -0,0 +1,47 @@
+local autocmd = vim.api.nvim_create_autocmd
+local augroup = vim.api.nvim_create_augroup
+
+local CrentistGroup = augroup('Crentist', {})
+
+autocmd('LspAttach', {
+    group = CrentistGroup,
+    callback = function(e)
+        local opts = { buffer = e.buf }
+        vim.keymap.set("n", "gd", function() vim.lsp.buf.definition() end, opts)
+        vim.keymap.set("n", "K", function() vim.lsp.buf.hover() end, opts)
+        vim.keymap.set("n", "<leader>vws", function() vim.lsp.buf.workspace_symbol() end, opts)
+        vim.keymap.set("n", "<leader>vd", function() vim.diagnostic.open_float() end, opts)
+        vim.keymap.set("n", "<leader>vca", function() vim.lsp.buf.code_action() end, opts)
+        vim.keymap.set("n", "<leader>vrr", function() vim.lsp.buf.references() end, opts)
+        vim.keymap.set("n", "<leader>vrn", function() vim.lsp.buf.rename() end, opts)
+        vim.keymap.set("i", "<C-h>", function() vim.lsp.buf.signature_help() end, opts)
+        vim.keymap.set("n", "[d", function() vim.diagnostic.goto_next() end, opts)
+        vim.keymap.set("n", "]d", function() vim.diagnostic.goto_prev() end, opts)
+        vim.keymap.set("n", "<M-F>", "<cmd>lua vim.lsp.buf.format()<CR>")
+    end
+})
+
+-- Add new line to the end of the file
+autocmd({ "BufWritePre" }, {
+    group = augroup('UserOnSave', {}),
+    pattern = '*',
+    callback = function()
+        local n_lines = vim.api.nvim_buf_line_count(0)
+        local last_nonblank = vim.fn.prevnonblank(n_lines)
+        if last_nonblank <= n_lines then
+            vim.api.nvim_buf_set_lines(0,
+                last_nonblank, n_lines, true, { '' })
+        end
+    end,
+})
+
+-- Remove trailing spaces
+vim.api.nvim_create_autocmd({ "BufWritePre" }, {
+    pattern = { "*" },
+    callback = function()
+        local save_cursor = vim.fn.winsaveview()
+        pcall(function() vim.cmd [[%s/\s\+$//e]] end)
+        vim.fn.winrestview(save_cursor)
+    end,
+})
+