Prepare for Goldmark

This commmit prepares for the addition of Goldmark as the new Markdown renderer in Hugo.

This introduces a new `markup` package with some common interfaces and each implementation in its own package.

See #5963

2 files changed, 104 insertions, 0 deletions

diff --git a/markup/org/convert.go b/markup/org/convert.go
new file mode 100644
index 000000000..a951e6fe1
--- /dev/null
+++ b/markup/org/convert.go
@@ -0,0 +1,69 @@
+// 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 org converts Emacs Org-Mode to HTML.
+package org
+
+import (
+	"bytes"
+
+	"github.com/gohugoio/hugo/markup/converter"
+	"github.com/niklasfasching/go-org/org"
+	"github.com/spf13/afero"
+)
+
+// Provider is the package entry point.
+var Provider converter.NewProvider = provide{}
+
+type provide struct {
+}
+
+func (p provide) New(cfg converter.ProviderConfig) (converter.Provider, error) {
+	var n converter.NewConverter = func(ctx converter.DocumentContext) (converter.Converter, error) {
+		return &orgConverter{
+			ctx: ctx,
+			cfg: cfg,
+		}, nil
+	}
+	return n, nil
+}
+
+type orgConverter struct {
+	ctx converter.DocumentContext
+	cfg converter.ProviderConfig
+}
+
+func (c *orgConverter) Convert(ctx converter.RenderContext) (converter.Result, error) {
+	logger := c.cfg.Logger
+	config := org.New()
+	config.Log = logger.WARN
+	config.ReadFile = func(filename string) ([]byte, error) {
+		return afero.ReadFile(c.cfg.ContentFs, filename)
+	}
+	writer := org.NewHTMLWriter()
+	writer.HighlightCodeBlock = func(source, lang string) string {
+		highlightedSource, err := c.cfg.Highlight(source, lang, "")
+		if err != nil {
+			logger.ERROR.Printf("Could not highlight source as lang %s. Using raw source.", lang)
+			return source
+		}
+		return highlightedSource
+	}
+
+	html, err := config.Parse(bytes.NewReader(ctx.Src), c.ctx.DocumentName).Write(writer)
+	if err != nil {
+		logger.ERROR.Printf("Could not render org: %s. Using unrendered content.", err)
+		return converter.Bytes(ctx.Src), nil
+	}
+	return converter.Bytes([]byte(html)), nil
+}
diff --git a/markup/org/convert_test.go b/markup/org/convert_test.go
new file mode 100644
index 000000000..94fcdf836
--- /dev/null
+++ b/markup/org/convert_test.go
@@ -0,0 +1,35 @@
+// 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 org
+
+import (
+	"testing"
+
+	"github.com/gohugoio/hugo/common/loggers"
+
+	"github.com/gohugoio/hugo/markup/converter"
+
+	qt "github.com/frankban/quicktest"
+)
+
+func TestConvert(t *testing.T) {
+	c := qt.New(t)
+	p, err := Provider.New(converter.ProviderConfig{Logger: loggers.NewErrorLogger()})
+	c.Assert(err, qt.IsNil)
+	conv, err := p.New(converter.DocumentContext{})
+	c.Assert(err, qt.IsNil)
+	b, err := conv.Convert(converter.RenderContext{Src: []byte("testContent")})
+	c.Assert(err, qt.IsNil)
+	c.Assert(string(b.Bytes()), qt.Equals, "<p>\ntestContent\n</p>\n")
+}