Toggle spellang in Vim.

toggle_spell.vim

" Toggle spell with a language. {{{
function! ToggleSpell(lang)
	if !exists("b:old_spelllang")
		let b:old_spelllang = &spelllang
		let b:old_spellfile = &spellfile
		let b:old_dictionary = &dictionary
	endif

	let l:newMode = ""
	if !&l:spell || a:lang != &l:spelllang
		setlocal spell
		let l:newMode = "spell"
		execute "setlocal spelllang=" . a:lang
		execute "setlocal spellfile=" . "~/.vim/spell/" . matchstr(a:lang, "[a-zA-Z][a-zA-Z]") . "." . &encoding . ".add"
		execute "setlocal dictionary=" . "~/.vim/spell/" . a:lang . "." . &encoding . ".dic"
		let l:newMode .= ", " . a:lang
	else
		setlocal nospell
		let l:newMode = "nospell"
		execute "setlocal spelllang=" . b:old_spelllang
		execute "setlocal spellfile=" . b:old_spellfile
		execute "setlocal dictionary=" . b:old_dictionary
	endif
	return l:newMode
endfunction
" }}}
nmap <silent> <F7> :echo ToggleSpell("en_us")<CR>			" Toggle English spell.
nmap <silent> <F8> :echo ToggleSpell("sv")<CR>				" Toggle Swedish spell.