global !p
def complete(t, opts):
	if t:
		opts = [m[len(t):] for m in opts if m.startswith(t)]
	if len(opts) == 1:
		return opts[0]
	return '(' + '|'.join(opts) + ')'
endglobal

snippet !! "Standard message" bA
$1`!p snip.rv=complete(t[1], ["BUG", "INFO", "UPDATE", "FEATURE", "ADD"])`: $2`!p snip.rv=complete(t[2], ["OPEN", "CLOSE", "FIX", "WARNING", "ERROR", "ADD", "REMOVED", "TODO"])` `!p
if t[3] == "":
	snip.rv = ""
else:
	snip.rv = "=>"` $3
endsnippet