global !p
def make_comment():
	b, e = vim.eval("&commentstring").split( '%s' )
	return b, e
endglobal

snippet todo "A universal TODO reminder" b
`!p
comment = make_comment()
snip.rv = comment[ 0 ]
` TODO: ${1:desc} (`!v $USER`, `!v strftime("%c")`) `!p
comment = make_comment()
snip.rv = comment[ 1 ]`
$0
endsnippet

snippet fix "A universal FIXME reminder" b
`!p
comment = make_comment()
snip.rv = comment[ 0 ]
` FIXME: ${1:desc} (`!v $USER`, `!v strftime("%c")`) `!p
comment = make_comment()
snip.rv = comment[ 1 ]`
$0
endsnippet