" Example Code for detect *.html as tmt2html or tt2html or xhtml or html.
function! s:detect_xhtml()
if getline(1).getline(2).getline(3) =~ '\<!DOCTYPE\s\_.\sXHTML\s'
setfiletype xhtml
endif
setfiletype html
endfunction
function! s:detect_html()
let save_cursor = getpos('.')
call cursor(1, 1)
if search('->', 'cn' ) > 0
setfiletype tmt2html
" XXX: if you have tt2html syntax, please uncomment it.
" elseif search('\[%', 'cn') > 0
" setfiletype tt2html
else
call s:detect_xhtml()
endif
call setpos('.', save_cursor)
endfunction
autocmd! BufReadPost *.html call s:detect_html()