nvim/lua/plugins/nvim-lspconfig.lua

-----------------------------------------------------------
-- Neovim LSP configuration file
-----------------------------------------------------------

-- Plugin: nvim-lspconfig
-- url: https://github.com/neovim/nvim-lspconfig
local lsp_status_ok, lspconfig = pcall(require, 'lspconfig')
if not lsp_status_ok then
  return
end

local cmp_status_ok, cmp_nvim_lsp = pcall(require, 'cmp_nvim_lsp')
if not cmp_status_ok then
  return
end

-- Diagnostic options, see: `:help vim.diagnostic.config`
vim.diagnostic.config({
  update_in_insert = true,
  float = {
    focusable = false,
    style = "minimal",
    border = "rounded",
    source = "always",
    header = "",
    prefix = "",
	},
})

-- Show line diagnostics automatically in hover window
vim.cmd([[
  autocmd CursorHold,CursorHoldI * lua vim.diagnostic.open_float(nil, { focus = false })
]])


-- 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)
  local function buf_set_keymap(...) vim.api.nvim_buf_set_keymap(bufnr, ...) end
  local function buf_set_option(...) vim.api.nvim_buf_set_option(bufnr, ...) end


  -- Enable completion triggered by <c-x><c-o>
  buf_set_option('omnifunc', 'v:lua.vim.lsp.omnifunc')

  -- Mappings.
  local opts = { noremap = true, silent = true }

  -- See `:help vim.lsp.*` for documentation on any of the below functions
  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

--[[

Language servers setup:

For language servers list see:
https://github.com/neovim/nvim-lspconfig/blob/master/doc/server_configurations.md

Language server installed:

Bash          -> bashls
Python        -> pyright
C-C++         -> clangd
HTML/CSS/JSON -> vscode-html-languageserver
JavaScript/TypeScript -> tsserver

--]]

-- Define `root_dir` when needed
-- See: https://github.com/neovim/nvim-lspconfig/issues/320
-- This is a workaround, maybe not work with some servers.
local root_dir = function()
  return vim.fn.getcwd()
end

-- Use a loop to conveniently call 'setup' on multiple servers and
-- map buffer local keybindings when the language server attaches.
-- Add your language server below:
local servers = { 'bashls', 'pyright', 'clangd', 'html', 'cssls', 'tsserver'}

-- Call setup
for _, lsp in ipairs(servers) do
  lspconfig[lsp].setup {
    on_attach = on_attach,
    root_dir = root_dir,
    capabilities = capabilities,
    flags = {
      -- default in neovim 0.7+
      debounce_text_changes = 150,
    }
  }
end