Perform a git pull to update the layers repository

func.vim

function! s:scratch_buffer()
  rightbelow new
  setlocal nobuflisted buftype=nofile bufhidden=wipe noswapfile
  return bufnr('%')
endfunction

let s:update_output = ["Updating SpaceNeovim layers"]
function! s:update_job_control(job_id, data, event)
  if a:event == 'stdout' || a:event == 'stderr'
     let s:update_output += a:data
    call nvim_buf_set_lines(self.buf, 0, -1, v:true, s:update_output)
  else
    set nomodifiable
  endif
endfunction

let s:update_callbacks = {
\  'on_stdout': function('s:update_job_control')
\, 'on_stderr': function('s:update_job_control')
\, 'on_exit': function('s:update_job_control')
\}

function! UpdateSpaceneovimLayers()
  let s:config_dir = $HOME . '/.config/nvim'
  let s:spacevim_layers_dir = expand(resolve(s:config_dir . '/spaceneovim-layers'))

  let scratch_buffer = s:scratch_buffer()
  call nvim_buf_set_lines(scratch_buffer, 0, -1, v:true, s:update_output)
  let update_layers = jobstart([
  \  'git'
  \, 'pull'
  \, 'origin'
  \, 'master'
  \], extend({'cwd': s:spacevim_layers_dir, 'buf': scratch_buffer}, s:update_callbacks))
  wincmd k
endfunction