make sure documentation intro text only appears once

parser/pageparser/doc.go

@@ -0,0 +1,18 @@
+// Copyright 2018 The Hugo Authors. All rights reserved.
+//
+// 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 pageparser provides a parser for Hugo content files (Markdown, HTML etc.) in Hugo.
+// This implementation is highly inspired by the great talk given by Rob Pike called "Lexical Scanning in Go"
+// It's on YouTube, Google it!.
+// See slides here: http://cuddle.googlecode.com/hg/talk/lex.html
+package pageparser

parser/pageparser/pagelexer.go

@@ -11,10 +11,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// Package pageparser provides a parser for Hugo content files (Markdown, HTML etc.) in Hugo.
-// This implementation is highly inspired by the great talk given by Rob Pike called "Lexical Scanning in Go"
-// It's on YouTube, Google it!.
-// See slides here: http://cuddle.googlecode.com/hg/talk/lex.html
 package pageparser
 
 import (

parser/pageparser/pagelexer_intro.go

@@ -11,10 +11,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// Package pageparser provides a parser for Hugo content files (Markdown, HTML etc.) in Hugo.
-// This implementation is highly inspired by the great talk given by Rob Pike called "Lexical Scanning in Go"
-// It's on YouTube, Google it!.
-// See slides here: http://cuddle.googlecode.com/hg/talk/lex.html
 package pageparser
 
 func lexIntroSection(l *pageLexer) stateFunc {

parser/pageparser/pagelexer_shortcode.go

@@ -11,10 +11,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// Package pageparser provides a parser for Hugo content files (Markdown, HTML etc.) in Hugo.
-// This implementation is highly inspired by the great talk given by Rob Pike called "Lexical Scanning in Go"
-// It's on YouTube, Google it!.
-// See slides here: http://cuddle.googlecode.com/hg/talk/lex.html
 package pageparser
 
 type lexerShortcodeState struct {

parser/pageparser/pageparser.go

@@ -11,10 +11,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// Package pageparser provides a parser for Hugo content files (Markdown, HTML etc.) in Hugo.
-// This implementation is highly inspired by the great talk given by Rob Pike called "Lexical Scanning in Go"
-// It's on YouTube, Google it!.
-// See slides here: http://cuddle.googlecode.com/hg/talk/lex.html
 package pageparser
 
 import (