Vim Custom Command

customcommand.vim

" put me in your vimrc
" bind run command
map <leader>r :call RunCustomCommand()<cr>
map <leader>s :call SetCustomCommand()<cr>
let g:silent_custom_command = 0
function! RunCustomCommand()
  up
  if g:silent_custom_command
    execute 'silent !' . s:customcommand
  else
    execute '!' . s:customcommand
  end
endfunction

function! SetCustomCommand()
  let s:customcommand = input('Enter Custom Command$ ')
endfunction