Add generic TODO snippet using commentstring

UltiSnips/all.snippets

@@ -1,3 +1,22 @@
 snippet tab "Insert tab literal"
 	$0
 endsnippet
+
+global !p
+comment=vim.current.buffer.options['commentstring'].strip()
+def commentbefore():
+	return comment[0:comment.find('%s')].strip() + ' '
+def commentafter():
+	after=comment[comment.find('%s')+2:].strip()
+	if 0 < len(after):
+		return ' ' + after
+	return ''
+endglobal
+
+snippet todo "TODO commment"
+`!p snip.rv=commentbefore()`TODO$1: $0`!p snip.rv=commentafter()`
+endsnippet
+
+snippet note "NOTE comment"
+`!p snip.rv=commentbefore()`NOTE: $0`!p snip.rv=commentafter()`
+endsnippet