.vimrc

let g:lightline = {
  \ 'colorscheme': 'jellybeans',
  \ 'mode_map': { 'c': 'NORMAL' },
  \ 'active': {
  \   'left': [ [ 'mode', 'paste' ], [ 'fugitive', 'gitgutter', 'filename' ], [ 'go' ] ]
  \ },
  \ 'component': {
  \   'go': '%#goStatuslineColor#%{LightLineGo()}%*',
  \ },
  \ 'component_function': {
  \   'modified': 'LightLineModified',
  \   'readonly': 'LightLineReadonly',
  \   'fugitive': 'LightLineFugitive',
  \   'gitgutter': 'LightLineGitGutter',
  \   'filename': 'LightLineFilename',
  \   'fileformat': 'LightLineFileformat',
  \   'filetype': 'LightLineFiletype',
  \   'fileencoding': 'LightLineFileencoding',
  \   'mode': 'LightLineMode',
  \ }
\ }

function! LightLineGo()
  if ! exists('*go#statusline#Show')
    return ''
  endif
  return winwidth('.') > 70 ? go#statusline#Show() : ''
endfunction