Using the attach from LSP to set buffer options

nvim/init.lua

@@ -21,17 +21,24 @@ vim.cmd [[
 -- Keybind: use '-' to open the file explorer
 vim.api.nvim_set_keymap('n', '-', ':Ex<CR>', { noremap=true, silent=true })
 
--- Rainbow braket configuration
-vim.g['rainbow_active'] = true
-
 -- lsp configuration
 local nvim_lsp = require('lspconfig')
+local function buf_set_keymap(...)
+	vim.api.nvim_buf_set_keymap(bufnr, ...)
+end
+local opts = { noremap=true, silent=true }
+
 local on_attach = function(client, bufnr)
-	local function buf_set_keymap(...)
-		vim.api.nvim_buf_set_keymap(bufnr, ...)
-	end
+	-- let's use the lsp filetype attach to set buffer (and window) options
+	vim.bo.expandtab = true
+	vim.bo.tabstop = 4
+	vim.bo.shiftwidth = 4
+	vim.bo.softtabstop = 4
+	vim.bo.textwidth = 79
+
+	vim.wo.number = true
+	vim.wo.colorcolumn = '80'
 
-	local opts = { noremap=true, silent=true }
 	buf_set_keymap('n', 'gD', '<Cmd>lua vim.lsp.buf.declaration()<CR>', opts)
 	buf_set_keymap('n', 'gd', '<Cmd>lua vim.lsp.buf.definition()<CR>', opts)
 	buf_set_keymap('n', 'K', '<Cmd>Lspsaga hover_doc<CR>', opts)