~/.vimrc: textwidth only in comments plus a few other fixes.

 * set comments for Haskell & Ruby
 * highlight *.md files as Markdown

.vimrc

" Incremental search is *awesome*
set incsearch
set ignorecase " ignore case
set smartcase " unless pattern contains uppercase
" Some wildcard tweaking
set wildignore=*.hi,*.o
" Have tabs 3 chars long...
set tabstop=3
set shiftwidth=3
set smarttab
" Copy indent of the last line.
set copyindent
" Wrap lines automatically
set textwidth=72
" Show whitespace
set list listchars=tab:»·,trail:·
" Keep a longer history
set history=100
" Wrap lines in textfiles automatically.
" (Any way to enable in comments?)
au FileType text set textwidth=72
function! g:setTextWidthInComments()
	" Capture new position
	let g:curTextPosition = synIDattr(synIDtrans(synID(line("."), col("."), 0)), "name")
	if( g:curTextPosition == "Comment" )
		set textwidth=72
	else
		set textwidth=0
	endif
endfunction
autocmd CursorMoved * :call g:setTextWidthInComments()
au BufNewFile,BufRead *.{hs,lhs} set comments=:--,sr:{-,ex:-}
au BufNewFile,BufRead *.rb set comments=:#,s:=begin,e:=end
" Don't let me further than 1 line towards the end or the beginning.
set scrolloff=1
noremap <c-b> :make<CR>
noremap <c-t> :CommandT<CR>
noremap <c-n> :tabnew<CR>:CommandT<CR>
noremap <c-f> :!ack 
noremap <c-f> :!ack
nmap <c-a> :w<CR>
noremap <Leader>t :TagbarOpen<CR>
""" Filetype specific stuff comes now...
autocmd BufNewFile,BufRead *.{html,css,xml} runtime plugin/zencoding.vim
autocmd BufNewFile,BufRead *.arc set ft=lisp
autocmd BufNewFile,BufRead *.md set ft=markdown
" Make folds a little more acceptable :)
highlight Folded ctermbg=255