use go 1.12

Signed-off-by: hongming <talonwan@yunify.com>

vendor/github.com/mholt/caddy/caddyhttp/markdown/summary/summary.go

@@ -0,0 +1,31 @@
+// Copyright 2015 Light Code Labs, LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package summary
+
+import (
+	"bytes"
+
+	"github.com/russross/blackfriday"
+)
+
+// Markdown formats input using a plain-text renderer, and
+// then returns up to the first `wordcount` words as a summary.
+func Markdown(input []byte, wordcount int) []byte {
+	words := bytes.Fields(blackfriday.Markdown(input, renderer{}, 0))
+	if wordcount > len(words) {
+		wordcount = len(words)
+	}
+	return bytes.Join(words[0:wordcount], []byte{' '})
+}