global !p

from datetime import datetime

def get_datetime():
	now = datetime.now()
	now_as_list = [
		now.strftime("%d"),
		now.strftime("%m"),
		now.strftime("%Y"),
		now.strftime("%H"),
		now.strftime("%M")
		]
	return now_as_list

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]
	else:
		return "(" + '|'.join(opts) + ")"

endglobal

snippet mail "Template for a new delayed Mail" b
time:${1:`!p snip.rv = get_datetime()[0]`}.${2:`!p snip.rv = get_datetime()[1]`}.${3:`!p snip.rv = get_datetime()[2]`} ${4:`!p snip.rv = get_datetime()[3]`}:${5:`!p snip.rv = get_datetime()[4]`}
from:$6`!p snip.rv = complete(t[6], ['yannick.reiss@nickr.eu', 'schnick.nickr.eu'])`
to:${7:schnick@nickr.eu}
subject:${8:Subject}

${9:Message}

${10:`cat ~/.signature.txt`}
endsnippet