all: Add org-mode support

Fixes #1483 
See #936

parser/frontmatter.go

@@ -19,6 +19,7 @@ import (
 	"errors"
 	"strings"
 
+	"github.com/chaseadamsio/goorgeous"
 	toml "github.com/pelletier/go-toml"
 
 	"gopkg.in/yaml.v2"
@@ -154,6 +155,8 @@ func DetectFrontMatter(mark rune) (f *frontmatterType) {
 		return &frontmatterType{[]byte(TOMLDelim), []byte(TOMLDelim), HandleTOMLMetaData, false}
 	case '{':
 		return &frontmatterType{[]byte{'{'}, []byte{'}'}, HandleJSONMetaData, true}
+	case '#':
+		return &frontmatterType{[]byte("#+"), []byte("\n"), HandleOrgMetaData, false}
 	default:
 		return nil
 	}
@@ -189,3 +192,7 @@ func HandleJSONMetaData(datum []byte) (interface{}, error) {
 	err := json.Unmarshal(datum, &f)
 	return f, err
 }
+
+func HandleOrgMetaData(datum []byte) (interface{}, error) {
+	return goorgeous.OrgHeaders(datum)
+}

parser/page.go

@@ -21,6 +21,8 @@ import (
 	"regexp"
 	"strings"
 	"unicode"
+
+	"github.com/chaseadamsio/goorgeous"
 )
 
 const (
@@ -91,9 +93,11 @@ func (p *page) Metadata() (meta interface{}, err error) {
 
 	if len(frontmatter) != 0 {
 		fm := DetectFrontMatter(rune(frontmatter[0]))
-		meta, err = fm.Parse(frontmatter)
-		if err != nil {
-			return
+		if fm != nil {
+			meta, err = fm.Parse(frontmatter)
+			if err != nil {
+				return
+			}
 		}
 	}
 	return
@@ -129,6 +133,12 @@ func ReadFrom(r io.Reader) (p Page, err error) {
 			return nil, err
 		}
 		newp.frontmatter = fm
+	} else if newp.render && goorgeous.IsKeyword(firstLine) {
+		fm, err := goorgeous.ExtractOrgHeaders(reader)
+		if err != nil {
+			return nil, err
+		}
+		newp.frontmatter = fm
 	}
 
 	content, err := extractContent(reader)