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gistfile1.vim

function! s:explorer(path)
  if a:path ==# '.'
    new
  elseif isdirectory(a:path)
    execute 'cd ' . a:path
  else
    execute 'tabedit ' . a:path
    return
  endif
  let list = filter(glob('*', 1, 1) + glob('.*', 1, 1), 'v:val !~ "^\\.$"')
  call map(list,'isdirectory(v:val) ? v:val . "/" : v:val ')
  setf explorer
  %delete _
  call setline(1,list)
  nnoremap <buffer> <cr> :call <sid>explorer(getline('.'))<cr>
endfunction

call s:explorer('.')