~/.vimrc: Supposedly better pasting and darkroom/focusmode

.vimrc

set tabstop=3
set shiftwidth=3
set smarttab
set paste " keep indendation on paste
set number " With numbertoggle they're quite cool (I think)
autocmd CursorMoved * :call g:setTextWidthInComments()
" via <http://paulrouget.com/e/vimdarkroom>
function! ToggleFocusMode()
  if (&foldcolumn != 12)
    set laststatus=0
    set numberwidth=10
    set foldcolumn=12
    set noruler
    set showtabline=0
    hi FoldColumn ctermbg=none
    hi LineNr ctermfg=0 ctermbg=none
    hi NonText ctermfg=0
  else
    set laststatus=2
    set numberwidth=4
    set foldcolumn=0
    set ruler
    set showtabline=1
    colorscheme solarized
  endif
endfunc
nnoremap F :call ToggleFocusMode()<cr>
au BufNewFile,BufRead *.{hs,lhs} set comments=:--,sr:{-,ex:-}
au BufNewFile,BufRead *.rb set comments=:#,s:=begin,e:=end
au BufNewFile,BufRead *.{opa,trx} set filetype=opa shiftwidth=2 tabstop=2 expandtab