custom_screen_send.vim

let g:ScreenImpl = 'Tmux'

function! CustomScreenSend()
  silent! %s/\s\+$//e
  silent! g/^$/d

  ScreenSend
  silent! normal! ggdG
endfunction

function! CustomScreenShell(command, filetype)
  execute 'setlocal ft=' . a:filetype

  setlocal fileencoding=utf-8
  setlocal cursorline
  setlocal buftype=nofile
  setlocal noswapfile
  setlocal nowrap
  setlocal nomodified

  execute 'ScreenShell ' . a:command

  nmap <silent> <enter> :call CustomScreenSend()<cr>
endfunction

command! -nargs=0 Pry call CustomScreenShell('pry', 'ruby')
command! -nargs=0 Zsh call CustomScreenShell('zsh', 'sh')