Neomvim Install

Setup

1. Install Packer

git clone --depth 1 https://github.com/wbthomason/packer.nvim\
 ~/.local/share/nvim/site/pack/packer/start/packer.nvim

2. Create Init file

cd ~/.config/nvim/lua
touch init.lua

3. Create Plugins file

cd ~/.config/nvim/
mkdir lua
cd lua
touch plugins.lua

~/.config/nvim/init.lua

require("plugins")

~/.config/nvim/lua/plugins.lua

local use = require('packer').use
require('packer').startup(function()
  use 'wbthomason/packer.nvim' -- Package manager
  use 'neovim/nvim-lspconfig' -- Configurations for Nvim LSP
end)

-- Mappings.
-- See `:help vim.diagnostic.*` for documentation on any of the below functions
local opts = { noremap=true, silent=true }
vim.keymap.set('n', '<space>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', '<space>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=true, 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', '<space>wa', vim.lsp.buf.add_workspace_folder, bufopts)
  vim.keymap.set('n', '<space>wr', vim.lsp.buf.remove_workspace_folder, bufopts)
  vim.keymap.set('n', '<space>wl', function()
    print(vim.inspect(vim.lsp.buf.list_workspace_folders()))
  end, bufopts)
  vim.keymap.set('n', '<space>D', vim.lsp.buf.type_definition, bufopts)
  vim.keymap.set('n', '<space>rn', vim.lsp.buf.rename, bufopts)
  vim.keymap.set('n', '<space>ca', vim.lsp.buf.code_action, bufopts)
  vim.keymap.set('n', 'gr', vim.lsp.buf.references, bufopts)
  vim.keymap.set('n', '<space>f', function() vim.lsp.buf.format { async = true } end, bufopts)
end

local lspconfig = require('lspconfig')
local configs = require 'lspconfig.configs'

if not configs.fuzzy_ls then
  configs.fuzzy_ls = {
    default_config = {
      cmd = {'fuzzy'};
      filetypes = {'ruby'};
      root_dir = function(fname)
        return lspconfig.util.find_git_ancestor(fname)
      end;
      settings = {};
      init_options = {
        allocationType = "ram",
        indexGems = true,
        reportDiagnostics = true
      };
    };
  }
end

lspconfig.fuzzy_ls.setup {
    on_attach = on_attach
}