Neovim init.lua with nvim-lspconfig, nvim-lsp-insatller and nvim-cmp

init.lua

-- packer.nvimを自動でインストール
local install_path = vim.fn.stdpath "data" .. "/site/pack/packer/start/packer.nvim"
local packer_bootstrap = nil
if vim.fn.empty(vim.fn.glob(install_path)) > 0 then
  packer_bootstrap = vim.fn.system {
    "git",
    "clone",
    "--depth",
    "1",
    "https://github.com/wbthomason/packer.nvim",
    install_path,
  }
end

-- プラグインをインストール
require("packer").startup(function(use)
  use "wbthomason/packer.nvim"

  -- Lsp関係
  use "neovim/nvim-lspconfig"
  use "williamboman/nvim-lsp-installer"

  -- 補完関係
  use "hrsh7th/nvim-cmp"
  use "hrsh7th/cmp-nvim-lsp"
  use "hrsh7th/cmp-vsnip"
  use "hrsh7th/cmp-buffer"
  use "hrsh7th/vim-vsnip"

  -- null-ls
  use { "jose-elias-alvarez/null-ls.nvim", requires = { "nvim-lua/plenary.nvim" } }

  if packer_bootstrap then
    require("packer").sync()
  end
end)

-- LSPクライアントがバッファにアタッチされたときに実行される
local on_attach = function(client, bufnr)
  local function buf_set_keymap(...)
    vim.api.nvim_buf_set_keymap(bufnr, ...)
  end

  -- LSPサーバーのフォーマット機能を無効にする
  -- client.resolved_capabilities.document_formatting = false

  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>lua vim.lsp.buf.hover()<CR>", opts)
  buf_set_keymap("n", "gi", "<cmd>lua vim.lsp.buf.implementation()<CR>", opts)
  buf_set_keymap("n", "<C-k>", "<cmd>lua vim.lsp.buf.signature_help()<CR>", opts)
  buf_set_keymap("n", "<space>wa", "<cmd>lua vim.lsp.buf.add_workspace_folder()<CR>", opts)
  buf_set_keymap("n", "<space>wr", "<cmd>lua vim.lsp.buf.remove_workspace_folder()<CR>", opts)
  buf_set_keymap("n", "<space>wl", "<cmd>lua print(vim.inspect(vim.lsp.buf.list_workspace_folders()))<CR>", opts)
  buf_set_keymap("n", "<space>D", "<cmd>lua vim.lsp.buf.type_definition()<CR>", opts)
  buf_set_keymap("n", "<space>rn", "<cmd>lua vim.lsp.buf.rename()<CR>", opts)
  buf_set_keymap("n", "<space>ca", "<cmd>lua vim.lsp.buf.code_action()<CR>", opts)
  buf_set_keymap("n", "gr", "<cmd>lua vim.lsp.buf.references()<CR>", opts)
  buf_set_keymap("n", "<space>e", "<cmd>lua vim.lsp.diagnostic.show_line_diagnostics()<CR>", opts)
  buf_set_keymap("n", "[d", "<cmd>lua vim.lsp.diagnostic.goto_prev()<CR>", opts)
  buf_set_keymap("n", "]d", "<cmd>lua vim.lsp.diagnostic.goto_next()<CR>", opts)
  buf_set_keymap("n", "<space>q", "<cmd>lua vim.lsp.diagnostic.set_loclist()<CR>", opts)
  buf_set_keymap("n", "<space>f", "<cmd>lua vim.lsp.buf.formatting()<CR>", opts)
end

local lsp_installer = require "nvim-lsp-installer"
lsp_installer.on_server_ready(function(server)
  local opts = {}
  opts.on_attach = on_attach
  opts.capabilities = require("cmp_nvim_lsp").update_capabilities(vim.lsp.protocol.make_client_capabilities())

  server:setup(opts)
  vim.cmd [[ do User LspAttachBuffers ]]
end)

-- nvim-cmp(補完) の設定
vim.opt.completeopt = "menu,menuone,noselect"

local cmp = require "cmp"
cmp.setup {
  snippet = {
    expand = function(args)
      vim.fn["vsnip#anonymous"](args.body)
    end,
  },
  mapping = {
    ["<C-d>"] = cmp.mapping.scroll_docs(-4),
    ["<C-f>"] = cmp.mapping.scroll_docs(4),
    ["<C-Space>"] = cmp.mapping.complete(),
    ["<C-e>"] = cmp.mapping.close(),
    ["<CR>"] = cmp.mapping.confirm { select = true },
  },
  sources = cmp.config.sources({
    { name = "nvim_lsp" },
    { name = "vsnip" },
  }, {
    { name = "buffer" },
  }),
}

-- null-ls (formatter/linter)の設定
local nullls = require "null-ls"
nullls.config {
  sources = {
    nullls.builtins.formatting.prettier,
    -- nullls.builtins.formatting.eslint
  },
}
require("lspconfig")["null-ls"].setup {}