" blank line so far ? use tab to create ^I : use tab to autocomplete
inoremap <tab> <c-r>=InsertTabWrapper('forward')<cr>
inoremap <s-tab> <c-r>=InsertTabWrapper('backward')<cr>
function! InsertTabWrapper(direction)
	let line = getline('.')

	" snippets!
	if exists("*IMAP_Jumpfunc")
		let snippet = IMAP_Jumpfunc('', 0)
		if snippet != ""
			return snippet
		endif
	endif

	" if indenting, indent away
	if line =~ '^\s*$'
		return "\<tab>"
	endif

	" back up to the last whitespace
	let column  = col('.') - 1
	while column >= 0
		if line[ column ] =~ '\s'
			let column = column + 1
			break
		endif
		let column = column - 1
	endwhile

	let current_word = strpart( line, column, col('.') - 1)

	" looks like a path
	if current_word =~ '^\~\?\.\?\.\?/'
		return "\<c-x>\<c-f>"
	" otherwise throw keywords
	elseif a:direction == "backward"
		return "\<c-p>"
	else
		return "\<c-n>"
	endif
endfunction