Vim mappings for executing Ruby or Python

px.vim

" note the trailing white space on the next line
noremap <Leader>pe :!python % 
noremap <Leader>px :!python %<CR>

re.vim

" note the trailing white space on the next line
noremap <Leader>re :!ruby % 

RunFile.vim

function! RunFile()
  if match(@%, '.rb$') != -1
    let argv = input('!ruby % ')
    exec '!ruby % ' . argv
  elseif match(@%, '.py$') != -1
    let argv = input('!python % ')
    exec '!python % ' . argv
  else
    echo '<< ERROR >> RunFile() only supports ruby and python'
  endif
endfunction

noremap <Leader>rx :call RunFile()<CR>

rx.vim

noremap <Leader>rx :!ruby %<CR>