init.lua

local fn = vim.fn
local install_path = '~/.local/share/nvim/site/pack/packer/start/packer.nvim'

vim.cmd [[packadd packer.nvim]]

local function load_plugins()
  local use = require('packer').use
  require("packer").startup(
    {
      function()
        use 'wbthomason/packer.nvim'
        use {
          'lewis6991/gitsigns.nvim',
          requires = {
            'nvim-lua/plenary.nvim'
          },
          config = function()
            require('gitsigns').setup()
          end
        }
        use {
          'nvim-telescope/telescope.nvim',
          requires = {{'nvim-lua/popup.nvim'}, {'nvim-lua/plenary.nvim'}}
        }
        use 'chriskempson/base16-vim'
        use 'neovim/nvim-lspconfig'
      end
    }
  )
end

_G.load_config = function() 
  vim.lsp.set_log_level("trace")
  local nvim_lsp = require('lspconfig')
  local on_attach = function(_, 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

    buf_set_option('omnifunc', 'v:lua.vim.lsp.omnifunc')

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


  -- Add the server that troubles you here
  nvim_lsp['gopls'].setup {
      cmd = {'gopls'},
      on_attach = on_attach
  }

end

if fn.isdirectory(install_path) == 0 then
  fn.system({'git', 'clone', 'https://github.com/wbthomason/packer.nvim', install_path})
  load_plugins()
  require('packer').sync()
  vim.cmd 'autocmd User PackerComplete ++once lua load_config()'
else
  load_plugins()
  _G.load_config()
end

local scopes = {o = vim.o, b = vim.bo, w = vim.wo}
local opt = function(scope, key, value) 
  scopes[scope][key] = value
  if scope ~= 'o' then scopes['o'][key] = value end
end

opt('b', 'expandtab', true)
opt('b', 'shiftwidth', 2)
opt('b', 'smartindent', true)                         -- Insert indents automatically
opt('b', 'tabstop', 2)                           -- Number of spaces tabs count for
opt('o', 'completeopt', 'menuone,noinsert,noselect')  -- Completion options (for deoplete)
opt('o', 'hidden', true)                              -- Enable modified buffers in background
opt('o', 'ignorecase', true)                          -- Ignore case
opt('o', 'joinspaces', false)                         -- No double spaces with join after a dot
opt('o', 'scrolloff', 4 )                             -- Lines of context
opt('o', 'shiftround', true)                          -- Round indent
opt('o', 'sidescrolloff', 8 )                         -- Columns of context
opt('o', 'smartcase', true)                           -- Don't ignore case with capitals
opt('o', 'splitbelow', true)                          -- Put new windows below current
opt('o', 'splitright', true)                          -- Put new windows right of current
opt('o', 'termguicolors', true)                       -- True color support
opt('o', 'wildmode', 'list:longest')                  -- Command-line completion mode
opt('w', 'list', true)                                -- Show some invisible characters (tabs...)
opt('w', 'number', true)                              -- Print line number
opt('w', 'relativenumber', true)                      -- Relative line numbers
opt('w', 'wrap', false)                               -- Disable line wrap
vim.cmd 'colorscheme base16-tomorrow-night'