Powerline rsync segment

.vimrc

let g:powerline_rsync = '0'

fu! SetRsync(text)
  let g:powerline_rsync=a:text
  execute ":redrawstatus!"
endf

fu! OnWrite()
  ...
  ...
  execute ':silent Start! ~/Yakabod/Workspaces/sync.sh ' . expand('%') . ' ' . a:user . '@' . a:server . ':' . a:destination
endf

Sync.sh

vim --servername main --remote-expr "SetRsync('1')"
ERR=$((/usr/bin/rsync --quiet $1 $2) 2>&1)
if [ $? -eq "0" ]; then
  vim --servername main --remote-expr "SetRsync('0')"
else
  vim --servername main --remote-expr "SetRsync('$ERR')"
fi

vim.py

@requires_segment_info
def rsync_indicator(pl, segment_info, text='RSYNC'):
  '''Return a rsync mode indicator.

  :param string text:
    text to display if rsync mode is enabled
  '''
  result = vim.eval('g:powerline_rsync')
  if result.isdigit():
    if int(result):
      text='RSYNC'
    else:
      text=None
  else:
    text='RSYNC !'

  return text