neovim-config/lua/plugins/lsp.lua

return {
  {
    "neovim/nvim-lspconfig",
    event = { "BufReadPre", "BufNewFile" },
    dependencies = {
      -- LSP Support
      { "williamboman/mason.nvim", cmd = "Mason", build = ":MasonUpdate" },
      {
        "williamboman/mason-lspconfig.nvim",
        config = function(_, opts) end,
      },
    },

    ---@class PluginLspOpts
    opts = {
      ---@type lspconfig.options
      servers = {
        tsserver = {
          settings = {},
        },
        lua_ls = {
          settings = { Lua = { diagnostics = { globals = { "vim" } } } },
        },
	},
    },
    config = function(_, opts)
      require("mason").setup()
      local mason_lspconfig = require("mason-lspconfig")
      local lsp_config = require("lspconfig")

      local lsp_capabilities = vim.tbl_deep_extend(
        "force",
        {},
        vim.lsp.protocol.make_client_capabilities(),
        require("cmp_nvim_lsp").default_capabilities()
      )

      local lsp_attach = function(client, bufnr)
        local key_opts = { buffer = bufnr, remap = false }

        -- Keymaps
        vim.keymap.set("n", "K", vim.lsp.buf.hover, key_opts)
        vim.keymap.set("n", "gd", vim.lsp.buf.definition, key_opts)
        vim.keymap.set("n", "[d", vim.diagnostic.goto_next, key_opts)
        vim.keymap.set("n", "]d", vim.diagnostic.goto_prev, key_opts)
        vim.keymap.set("n", "<leader>df", vim.diagnostic.open_float, key_opts)
        vim.keymap.set("n", "<leader>ca", vim.lsp.buf.code_action, key_opts)
        vim.keymap.set("n", "<leader>rn", vim.lsp.buf.rename, key_opts)
      end

      mason_lspconfig.setup({
        ensure_installed = {
          "cssls",
          "emmet_ls",
          "eslint",
          "jsonls",
          "lua_ls",
          --"tailwindcss",
          "tsserver",
          -- linter
          -- "eslint_d",
          -- formatter
          -- "stylua",
          -- "prettierd",
        },
      })
      mason_lspconfig.setup_handlers({
        function(server_name)
          lsp_config[server_name].setup({
            on_attach = lsp_attach,
            capabilities = lsp_capabilities,
            settings = opts.servers[server_name] and opts.servers[server_name].settings or {},
          })
        end,
      })

      vim.diagnostic.config({
        underline = true,
        update_in_insert = false,
        virtual_text = {
          spacing = 4,
          source = "if_many",
        },
        severity_sort = true,
        float = {
          focusable = true,
          style = "minimal",
          border = "rounded",
          source = "always",
          header = "",
          prefix = "",
        },
      })
    end,
  },
  {
    "L3MON4D3/LuaSnip",
    build = (not jit.os:find("Windows"))
        and "echo -e 'NOTE: jsregexp is optional, so not a big deal if it fails to build\n'; make install_jsregexp"
      or nil,
    -- dependencies = {
    --   "rafamadriz/friendly-snippets",
    --   config = function()
    --     require("luasnip.loaders.from_vscode").lazy_load()
    --   end,
    -- },
  },
  {
    "hrsh7th/nvim-cmp",
    version = false, -- last release is way too old
    event = "InsertEnter",
    dependencies = {
      "hrsh7th/cmp-nvim-lsp",
      "hrsh7th/cmp-buffer",
      "hrsh7th/cmp-path",
      "saadparwaiz1/cmp_luasnip",
    },
    config = function()
      local has_words_before = function()
        unpack = unpack or table.unpack
        local line, col = unpack(vim.api.nvim_win_get_cursor(0))
        return col ~= 0 and vim.api.nvim_buf_get_lines(0, line - 1, line, true)[1]:sub(col, col):match("%s") == nil
      end

      local luasnip = require("luasnip")
      local cmp = require("cmp")
      local compare = require("cmp.config.compare")

      cmp.setup({
        snippet = {
          expand = function(args)
            require("luasnip").lsp_expand(args.body)
          end,
        },
        sources = cmp.config.sources({
          { name = "nvim_lsp", priority = 1 },
          { name = "luasnip", priority = 5, keyword_length = 2 },
          -- { name = "buffer", priority = 10, keyword_length = 3 },
          { name = "path", priority = 2 },
        }),
        mapping = cmp.mapping.preset.insert({
          ["<C-Space>"] = cmp.mapping.complete(),
          ["<C-e>"] = cmp.mapping.close(),
          ["<CR>"] = cmp.mapping.confirm({ select = true }),
          ["<Tab>"] = cmp.mapping(function(fallback)
            if cmp.visible() then
              cmp.select_next_item()
              -- You could replace the expand_or_jumpable() calls with expand_or_locally_jumpable()
              -- they way you will only jump inside the snippet region
            elseif luasnip.expand_or_locally_jumpable() then
              luasnip.expand_or_jump()
            elseif has_words_before() then
              cmp.complete()
            else
              fallback()
            end
          end, { "i", "s" }),
          ["<S-Tab>"] = cmp.mapping(function(fallback)
            if cmp.visible() then
              cmp.select_prev_item()
            elseif luasnip.jumpable(-1) then
              luasnip.jump(-1)
            else
              fallback()
            end
          end, { "i", "s" }),
        }),
      })
    end,
  }
}