vim-smartsplit

You're lazy. Let Vim decide your split directions.
git clone git://git.danielmoch.com/vim-smartsplit.git
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smartsplit.vim (2134B)

      1 "
      2 " TITLE:   VIM-SMARTSPLIT
      3 " AUTHOR:  Daniel Moch <daniel AT danielmoch DOT com>
      4 " LICENSE: VIM LICENSE
      5 " VERSION: 0.2.0-dev
      6 "
      7 if exists('g:loaded_smartsplit') || &cp
      8     finish
      9 endif
     10 
     11 let g:loaded_smartsplit = 1
     12 let s:save_cpo = &cpo
     13 set cpo&vim
     14 
     15 function! s:WinWidth()
     16     let l:textwidth = &tw ? (&tw + 8) : 80
     17     if &number
     18         let l:numwidth = &numberwidth > len(line('$')) + 1 ?
     19                     \ &numberwidth : len(line('$')) + 1
     20     else
     21         let l:numwidth = 0
     22     endif
     23     return winwidth(0) > (2 * l:textwidth) + (2 * l:numwidth)
     24 endfunction
     25 
     26 function! s:ScratchBuffer() abort
     27     let l:wincmd = s:WinWidth() ? 'vnew' : 'new'
     28     exec l:wincmd
     29     setlocal bufhidden=hide buftype=nofile noswapfile
     30 endfunction
     31 
     32 function! s:DiffOpt()
     33     if s:WinWidth()
     34         set diffopt+=vertical
     35     else
     36         set diffopt-=vertical
     37     endif
     38 endfunction
     39 
     40 function! s:NewWindow(...)
     41     if a:0 == 0
     42         let l:filename = ''
     43     else
     44         let l:filename = a:1
     45     endif
     46     if s:WinWidth()
     47         execute 'vnew '.l:filename
     48     else
     49         execute 'new '.l:filename
     50     endif
     51 endfunction
     52 
     53 function! s:Help(topic)
     54     if s:WinWidth()
     55         execute 'vert help '.a:topic
     56     else
     57         execute 'help '.a:topic
     58     endif
     59 endfunction
     60 
     61 function! s:Buffer(...)
     62     let l:splitcmd = s:WinWidth() ? 'vsplit' : 'split'
     63     execute l:splitcmd
     64     if a:0 == 1
     65         execute bufnr(a:1).'buffer'
     66     endif
     67 endfunction
     68 
     69 function! s:CmdSplit(command)
     70     if s:WinWidth()
     71         execute 'vertical '.a:command
     72     else
     73         execute a:command
     74     endif
     75 endfunction
     76 
     77 augroup smartsplit
     78     autocmd!
     79     autocmd VimResized * call <sid>DiffOpt()
     80     autocmd VimEnter * call <sid>DiffOpt()
     81 augroup END
     82 
     83 command! -complete=file -nargs=? New call <sid>NewWindow(<f-args>)
     84 command! -complete=help -nargs=1 Help call <sid>Help(<f-args>)
     85 command! -complete=buffer -nargs=1 Buffer call <sid>Buffer(<f-args>)
     86 command! -complete=command -nargs=1 CmdSplit call <sid>CmdSplit(<f-args>)
     87 command! Split call <sid>Buffer()
     88 command! ScratchBuffer call <sid>ScratchBuffer()
     89 
     90 let &cpo = s:save_cpo
     91 unlet s:save_cpo
     92 " vim: et sts=4 sw=4 tw=72