1 files changed, 143 insertions, 0 deletions
diff --git a/markup/mmark/convert.go b/markup/mmark/convert.go
new file mode 100644
index 000000000..a0da346c1
--- /dev/null
+++ b/markup/mmark/convert.go
@@ -0,0 +1,143 @@
+// 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 mmark converts Markdown to HTML using MMark v1.
+package mmark
+
+import (
+	"github.com/gohugoio/hugo/markup/internal"
+
+	"github.com/gohugoio/hugo/markup/converter"
+	"github.com/miekg/mmark"
+)
+
+// Provider is the package entry point.
+var Provider converter.NewProvider = provider{}
+
+type provider struct {
+}
+
+func (p provider) New(cfg converter.ProviderConfig) (converter.Provider, error) {
+	defaultBlackFriday, err := internal.NewBlackfriday(cfg)
+	if err != nil {
+		return nil, err
+	}
+
+	defaultExtensions := getMmarkExtensions(defaultBlackFriday)
+
+	var n converter.NewConverter = func(ctx converter.DocumentContext) (converter.Converter, error) {
+		b := defaultBlackFriday
+		extensions := defaultExtensions
+
+		if ctx.ConfigOverrides != nil {
+			var err error
+			b, err = internal.UpdateBlackFriday(b, ctx.ConfigOverrides)
+			if err != nil {
+				return nil, err
+			}
+			extensions = getMmarkExtensions(b)
+		}
+
+		return &mmarkConverter{
+			ctx:        ctx,
+			b:          b,
+			extensions: extensions,
+			cfg:        cfg,
+		}, nil
+	}
+
+	return n, nil
+
+}
+
+type mmarkConverter struct {
+	ctx        converter.DocumentContext
+	extensions int
+	b          *internal.BlackFriday
+	cfg        converter.ProviderConfig
+}
+
+func (c *mmarkConverter) Convert(ctx converter.RenderContext) (converter.Result, error) {
+	r := getHTMLRenderer(c.ctx, c.b, c.cfg)
+	return mmark.Parse(ctx.Src, r, c.extensions), nil
+}
+
+func getHTMLRenderer(
+	ctx converter.DocumentContext,
+	cfg *internal.BlackFriday,
+	pcfg converter.ProviderConfig) mmark.Renderer {
+
+	var (
+		flags      int
+		documentID string
+	)
+
+	documentID = ctx.DocumentID
+
+	renderParameters := mmark.HtmlRendererParameters{
+		FootnoteAnchorPrefix:       cfg.FootnoteAnchorPrefix,
+		FootnoteReturnLinkContents: cfg.FootnoteReturnLinkContents,
+	}
+
+	if documentID != "" && !cfg.PlainIDAnchors {
+		renderParameters.FootnoteAnchorPrefix = documentID + ":" + renderParameters.FootnoteAnchorPrefix
+	}
+
+	htmlFlags := flags
+	htmlFlags |= mmark.HTML_FOOTNOTE_RETURN_LINKS
+
+	return &mmarkRenderer{
+		Config:    cfg,
+		Cfg:       pcfg.Cfg,
+		highlight: pcfg.Highlight,
+		Renderer:  mmark.HtmlRendererWithParameters(htmlFlags, "", "", renderParameters),
+	}
+
+}
+
+func getMmarkExtensions(cfg *internal.BlackFriday) int {
+	flags := 0
+	flags |= mmark.EXTENSION_TABLES
+	flags |= mmark.EXTENSION_FENCED_CODE
+	flags |= mmark.EXTENSION_AUTOLINK
+	flags |= mmark.EXTENSION_SPACE_HEADERS
+	flags |= mmark.EXTENSION_CITATION
+	flags |= mmark.EXTENSION_TITLEBLOCK_TOML
+	flags |= mmark.EXTENSION_HEADER_IDS
+	flags |= mmark.EXTENSION_AUTO_HEADER_IDS
+	flags |= mmark.EXTENSION_UNIQUE_HEADER_IDS
+	flags |= mmark.EXTENSION_FOOTNOTES
+	flags |= mmark.EXTENSION_SHORT_REF
+	flags |= mmark.EXTENSION_NO_EMPTY_LINE_BEFORE_BLOCK
+	flags |= mmark.EXTENSION_INCLUDE
+
+	for _, extension := range cfg.Extensions {
+		if flag, ok := mmarkExtensionMap[extension]; ok {
+			flags |= flag
+		}
+	}
+	return flags
+}
+
+var mmarkExtensionMap = map[string]int{
+	"tables":                 mmark.EXTENSION_TABLES,
+	"fencedCode":             mmark.EXTENSION_FENCED_CODE,
+	"autolink":               mmark.EXTENSION_AUTOLINK,
+	"laxHtmlBlocks":          mmark.EXTENSION_LAX_HTML_BLOCKS,
+	"spaceHeaders":           mmark.EXTENSION_SPACE_HEADERS,
+	"hardLineBreak":          mmark.EXTENSION_HARD_LINE_BREAK,
+	"footnotes":              mmark.EXTENSION_FOOTNOTES,
+	"noEmptyLineBeforeBlock": mmark.EXTENSION_NO_EMPTY_LINE_BEFORE_BLOCK,
+	"headerIds":              mmark.EXTENSION_HEADER_IDS,
+	"autoHeaderIds":          mmark.EXTENSION_AUTO_HEADER_IDS,
+}