nvim lsp config example

init.lua

---==== AUTOCOMPLETION
--- Lspconfig
local nvim_lsp = require('lspconfig')

--- Mason - LSP server installer
require("mason").setup()
--- Nvim LSP installer
--require("nvim-lsp-installer").setup {}


--- Add this line for coq integration (only when coq is installed via Plug and deps installed via COQdeps
local coq = require "coq"

-- Mappings.
-- See `:help vim.diagnostic.*` for documentation on any of the below functions
local opts = { noremap=true, silent=true }
vim.keymap.set('n', '<localleader>e', vim.diagnostic.open_float, opts)
vim.keymap.set('n', '[d', vim.diagnostic.goto_prev, opts)
vim.keymap.set('n', ']d', vim.diagnostic.goto_next, opts)
vim.keymap.set('n', '<localleader>q', vim.diagnostic.setloclist, 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')

  -- Mappings.
  -- See `:help vim.lsp.*` for documentation on any of the below functions
  local bufopts = { noremap=false, silent=true, buffer=bufnr }
  vim.keymap.set('n', 'gD', vim.lsp.buf.declaration, bufopts)
  vim.keymap.set('n', 'gd', vim.lsp.buf.definition, bufopts)
  vim.keymap.set('n', 'K', vim.lsp.buf.hover, bufopts)
  vim.keymap.set('n', 'gi', vim.lsp.buf.implementation, bufopts)
  vim.keymap.set('n', '<C-k>', vim.lsp.buf.signature_help, bufopts)
  vim.keymap.set('n', '<localleader>wa', vim.lsp.buf.add_workspace_folder, bufopts)
  vim.keymap.set('n', '<localleader>wr', vim.lsp.buf.remove_workspace_folder, bufopts)
  vim.keymap.set('n', '<localleader>wl', function()
    print(vim.inspect(vim.lsp.buf.list_workspace_folders()))
  end, bufopts)
  vim.keymap.set('n', '<localleader>td', vim.lsp.buf.type_definition, bufopts)
  vim.keymap.set('n', '<localleader>rn', vim.lsp.buf.rename, bufopts)
  vim.keymap.set('n', '<localleader>ca', vim.lsp.buf.code_action, bufopts)
  vim.keymap.set('n', 'gr', vim.lsp.buf.references, bufopts)
  vim.keymap.set('n', '<localleader>f', function() vim.lsp.buf.format { async = true } end, bufopts)
end


-- Use a loop to conveniently call 'setup' on multiple servers and
-- map buffer local keybindings when the language server attaches
local servers = { 'pyright', 'rust_analyzer', 'tsserver','terraformls','tflint' }
for _, lsp in pairs(servers) do
  require('lspconfig')[lsp].setup {
    on_attach = on_attach,
    flags = {
      -- This will be the default in neovim 0.7+
      debounce_text_changes = 150,
    }
  }
end

-- CUSTOM addition to LSP

-- Better diagnostic pop ups
local lsp = vim.lsp
local handlers = lsp.handlers

-- Hover doc popup
local pop_opts = { border = "rounded", max_width = 80 }
handlers["textDocument/hover"] = lsp.with(handlers.hover, pop_opts)
handlers["textDocument/signatureHelp"] = lsp.with(handlers.signature_help, pop_opts)