return {
  'neovim/nvim-lspconfig',
  requires = {
    "SmiteshP/nvim-navbuddy",
  },
  config = function()
    local nvim_lsp = require('lspconfig')
    local clangd_extensions = require('clangd_extensions')
    local lsp_signature = require('lsp_signature')

    -- Mappings.
    local opts = { noremap=true, silent=true }
    vim.api.nvim_set_keymap('n', '<leader>e', '<cmd>lua vim.diagnostic.open_float()<CR>', opts)
    vim.api.nvim_set_keymap('n', '[d', '<cmd>lua vim.diagnostic.goto_prev()<CR>', opts)
    vim.api.nvim_set_keymap('n', ']d', '<cmd>lua vim.diagnostic.goto_next()<CR>', opts)
    vim.api.nvim_set_keymap('n', '<leader>E', '<cmd>lua vim.diagnostic.set_loclist()<CR>', opts)
    vim.api.nvim_set_keymap("n", "<leader>q", "<cmd>lua vim.lsp.buf.format{ async = true }<CR>", opts)

    -- Use an on_attach function to only map the following keys
    -- after the language server attaches to the current buffer
    local on_attach = function(client, bufnr)
      --Enable completion triggered by <c-x><c-o>
      vim.api.nvim_buf_set_option(bufnr, 'omnifunc', 'v:lua.vim.lsp.omnifunc')

      ---- See `:help vim.lsp.*` for documentation on any of the below functions
      vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gD', '<cmd>lua vim.lsp.buf.declaration()<CR>', opts)
      vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gd', '<cmd>lua vim.lsp.buf.definition()<CR>', opts)
      vim.api.nvim_buf_set_keymap(bufnr, 'n', 'K', '<cmd>lua vim.lsp.buf.hover()<CR>', opts)
      vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gi', '<cmd>lua vim.lsp.buf.implementation()<CR>', opts)
      vim.api.nvim_buf_set_keymap(bufnr, 'n', '<C-k>', '<cmd>lua vim.lsp.buf.signature_help()<CR>', opts)
      --vim.api.nvim_buf_set_keymap(bufnr, 'n', '<space>wa', '<cmd>lua vim.lsp.buf.add_workspace_folder()<CR>', opts)
      --vim.api.nvim_buf_set_keymap(bufnr, 'n', '<space>wr', '<cmd>lua vim.lsp.buf.remove_workspace_folder()<CR>', opts)
      --vim.api.nvim_buf_set_keymap(bufnr, 'n', '<space>wl', '<cmd>lua print(vim.inspect(vim.lsp.buf.list_workspace_folders()))<CR>', opts)
      vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>D', '<cmd>lua vim.lsp.buf.type_definition()<CR>', opts)
      vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>rn', '<cmd>lua vim.lsp.buf.rename()<CR>', opts)
      vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>ca', '<cmd>lua vim.lsp.buf.code_action()<CR>', opts)
      vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gr', '<cmd>lua vim.lsp.buf.references()<CR>', opts)
      vim.api.nvim_buf_set_keymap(bufnr, 'n', '<F6>', '<cmd>ClangdSwitchSourceHeader<cr>', opts)

      -- require'illuminate'.on_attach(client)
      require'virtualtypes'.on_attach()
      require'lsp_signature'.on_attach({
        floating_window = true,
        floating_window_above_cur_line = false,
        floating_window_off_x = 500,
        floating_window_off_y = -5,
      })
      require'nvim-navbuddy'.attach(client, bufnr)
      require'nvim-navic'.attach(client, bufnr)
    end

    local signs = {
      { name = "DiagnosticSignError", text = "" },
      { name = "DiagnosticSignWarn", text = "" },
      { name = "DiagnosticSignHint", text = "" },
      { name = "DiagnosticSignInfo", text = "" },
    }

    for _, sign in ipairs(signs) do
      vim.fn.sign_define(sign.name, { texthl = sign.name, text = sign.text, numhl = "" })
    end

    vim.lsp.handlers["textDocument/publishDiagnostics"] = vim.lsp.with(
      vim.lsp.diagnostic.on_publish_diagnostics, {
        signs = {
          active = signs,
          --severity_limit = 'info',
        },
        severity_sort = true,
        underline = false,
        update_in_insert = false,
        --virtual_text = {
        --  spacing = 40,
        --  severity_limit = 'Warning',
        --},
        virtual_text = false,
      }
    )

    local capabilities = require('cmp_nvim_lsp').default_capabilities()
    capabilities.offsetEncoding = { "utf-16" }

    nvim_lsp.groovyls.setup({
      cmd = { "java", "-jar", "/home/kmcr/tools/groovy-language-server/build/libs/groovy-language-server-all.jar" },
      on_attach = on_attach,
      --on_publish_diagnostics = diagnostic_handler,
      capabilities = capabilities
    })

    -- nvim_lsp.ccls.setup(
    --   coq.lsp_ensure_capabilities({
    --     init_options = {
    --       compilationDatabaseDirectory = ".";
    --       index = {
    --         threads = 0;
    --       },
    --       clang = {
    --         excludeArgs = { "-frounding-math"} ;
    --       },
    --     },
    --     root_dir = nvim_lsp.util.root_pattern("compile_commands.json"),
    --     on_attach = on_attach,
    --     on_publish_diagnostics = diagnostic_handler,
    --     flags = {
    --       debounce_text_changes = 150,
    --     }}
    --   )
    -- )

    clangd_extensions.setup({
      server = {
        on_attach = on_attach,
        root_pattern = {
          '.clangd',
          '.clang-tidy',
          '.clang-format',
          'compile_commands.json',
          'compile_flags.txt',
          'configure.ac',
        },
        capabilities = capabilities
      },
      inlay_hints = {
        max_len_align = true,
        max_len_align_padding = 3,
        right_align = true,
      }
    })

    nvim_lsp.pylsp.setup({
      settings = {
        pylint = {
          enabled = false
        },
        pyflakes = {
          enabled = false,
        },
      },
      -- flags = {
      --   debounce_text_changes = 150,
      -- },
      on_attach = on_attach,
      capabilities = capabilities
      --on_publish_diagnostics = diagnostic_handler,
    })

    -- Use a loop to conveniently call 'setup' on multiple servers and
    -- map buffer local keybindings when the language server attaches
    local servers = { "cmake", "rust_analyzer", "bashls", "marksman" }
    for _, lsp in ipairs(servers) do
      nvim_lsp[lsp].setup({
        on_attach = on_attach,
        --on_publish_diagnostics = diagnostic_handler,
        capabilities = capabilities,
        -- flags = {
        --   debounce_text_changes = 150,
        -- }
      })
  end
end
}