Opinionated config

Here I will show you a fully working example configuration that you can use as your init.lua. This one will have a fair amount code that goes beyond the essential. Here I will add more "completion sources" to nvim-cmp. More keybindings to the autocompletion plugin (nvim-cmp). And more snippets.

Expand: what's an init.lua?

Before I tell you, consider following this tutorial instead of copy/pasting this example config.

init.lua is the configuration file Neovim looks for during the initialization process.

The location of this file depends on your operating system. If you want to know where it should be located, you can execute this command in your terminal.

nvim --headless -c 'echo stdpath("config") . "\n"' -c 'quit'

Note that Neovim will not create that folder (or the init.lua file) for you. You need to do that manually.

lua

local lazypath = vim.fn.stdpath('data') .. '/lazy/lazy.nvim'

-- Auto-install lazy.nvim if not present
if not vim.uv.fs_stat(lazypath) then
  print('Installing lazy.nvim....')
  vim.fn.system({
    'git',
    'clone',
    '--filter=blob:none',
    'https://github.com/folke/lazy.nvim.git',
    '--branch=stable', -- latest stable release
    lazypath,
  })
end

vim.opt.rtp:prepend(lazypath)

require('lazy').setup({
  {'VonHeikemen/lsp-zero.nvim', branch = 'v4.x'},
  {'williamboman/mason.nvim'},
  {'williamboman/mason-lspconfig.nvim'},
  {'neovim/nvim-lspconfig'},
  {'L3MON4D3/LuaSnip'},
  {'hrsh7th/nvim-cmp'},
  {'hrsh7th/cmp-nvim-lsp'},
  {'hrsh7th/cmp-buffer'},
  {'hrsh7th/cmp-path'},
  {'saadparwaiz1/cmp_luasnip'},
  {'rafamadriz/friendly-snippets'},
})

local lsp_zero = require('lsp-zero')

local lsp_attach = function(client, bufnr)
  local opts = {buffer = bufnr}

  vim.keymap.set('n', 'K', '<cmd>lua vim.lsp.buf.hover()<cr>', opts)
  vim.keymap.set('n', 'gd', '<cmd>lua vim.lsp.buf.definition()<cr>', opts)
  vim.keymap.set('n', 'gD', '<cmd>lua vim.lsp.buf.declaration()<cr>', opts)
  vim.keymap.set('n', 'gi', '<cmd>lua vim.lsp.buf.implementation()<cr>', opts)
  vim.keymap.set('n', 'go', '<cmd>lua vim.lsp.buf.type_definition()<cr>', opts)
  vim.keymap.set('n', 'gr', '<cmd>lua vim.lsp.buf.references()<cr>', opts)
  vim.keymap.set('n', 'gs', '<cmd>lua vim.lsp.buf.signature_help()<cr>', opts)
  vim.keymap.set('n', '<F2>', '<cmd>lua vim.lsp.buf.rename()<cr>', opts)
  vim.keymap.set({'n', 'x'}, '<F3>', '<cmd>lua vim.lsp.buf.format({async = true})<cr>', opts)
  vim.keymap.set('n', '<F4>', '<cmd>lua vim.lsp.buf.code_action()<cr>', opts)
end

lsp_zero.extend_lspconfig({
  sign_text = true,
  lsp_attach = lsp_attach,
  float_border = 'rounded',
  capabilities = require('cmp_nvim_lsp').default_capabilities()
})

require('mason').setup({})
require('mason-lspconfig').setup({
  handlers = {
    function(server_name)
      require('lspconfig')[server_name].setup({})
    end,
  }
})

local cmp = require('cmp')
local cmp_action = lsp_zero.cmp_action()

-- this is the function that loads the extra snippets
-- from rafamadriz/friendly-snippets
require('luasnip.loaders.from_vscode').lazy_load()

cmp.setup({
  sources = {
    {name = 'path'},
    {name = 'nvim_lsp'},
    {name = 'luasnip', keyword_length = 2},
    {name = 'buffer', keyword_length = 3},
  },
  window = {
    completion = cmp.config.window.bordered(),
    documentation = cmp.config.window.bordered(),
  },
  snippet = {
    expand = function(args)
      require('luasnip').lsp_expand(args.body)
    end,
  },
  mapping = cmp.mapping.preset.insert({
    -- confirm completion item
    ['<Enter>'] = cmp.mapping.confirm({ select = true }),

    -- trigger completion menu
    ['<C-Space>'] = cmp.mapping.complete(),

    -- scroll up and down the documentation window
    ['<C-u>'] = cmp.mapping.scroll_docs(-4),
    ['<C-d>'] = cmp.mapping.scroll_docs(4),   

    -- navigate between snippet placeholders
    ['<C-f>'] = cmp_action.luasnip_jump_forward(),
    ['<C-b>'] = cmp_action.luasnip_jump_backward(),
  }),
  -- note: if you are going to use lsp-kind (another plugin)
  -- replace the line below with the function from lsp-kind
  formatting = lsp_zero.cmp_format({details = true}),
})

Opinionated config ​

Opinionated config