Support configuring a bibliography in markup config

Author: asankah

markup/bibliography/config.go

@@ -0,0 +1,25 @@
+// Copyright 2019 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 bibliography
+
+type Config struct {
+	// File containing bibliography. E.g. 'my-doc.bibtex'. By default assumed
+	// to be in BibTex format.
+	Source string
+
+	// Path to .csl file describing citation file.
+	CitationStyle string
+}
+
+var Default Config

markup/markup_config/config.go

@@ -17,6 +17,7 @@ import (
 	"github.com/gohugoio/hugo/config"
 	"github.com/gohugoio/hugo/docshelper"
 	"github.com/gohugoio/hugo/markup/asciidocext/asciidocext_config"
+	"github.com/gohugoio/hugo/markup/bibliography"
 	"github.com/gohugoio/hugo/markup/blackfriday/blackfriday_config"
 	"github.com/gohugoio/hugo/markup/goldmark/goldmark_config"
 	"github.com/gohugoio/hugo/markup/highlight"
@@ -34,6 +35,7 @@ type Config struct {
 
 	Highlight       highlight.Config
 	TableOfContents tableofcontents.Config
+	Bibliography    bibliography.Config
 
 	// Content renderers
 	Goldmark    goldmark_config.Config
@@ -92,6 +94,7 @@ var Default = Config{
 
 	TableOfContents: tableofcontents.DefaultConfig,
 	Highlight:       highlight.DefaultConfig,
+	Bibliography:    bibliography.Default,
 
 	Goldmark:    goldmark_config.Default,
 	BlackFriday: blackfriday_config.Default,

markup/pandoc/convert.go

@@ -62,7 +62,19 @@ func (c *pandocConverter) getPandocContent(src []byte, ctx converter.DocumentCon
 		return src
 	}
 
-	return internal.ExternallyRenderContent(c.cfg, ctx, src, path, c.cfg.MarkupConfig.Pandoc.AsPandocArguments())
+	arguments := c.cfg.MarkupConfig.Pandoc.AsPandocArguments()
+
+	bibliography := c.cfg.MarkupConfig.Bibliography
+
+	if bibliography.Source != "" {
+		arguments = append(arguments, "--bibliography", bibliography.Source)
+	}
+
+	if bibliography.CitationStyle != "" {
+		arguments = append(arguments, "--csl", bibliography.CitationStyle)
+	}
+
+	return internal.ExternallyRenderContent(c.cfg, ctx, src, path, arguments)
 }
 
 func getPandocExecPath() string {