Add init support of orgmode document type on file view and readme (#2525)

* add init support of orgmode document type on file view and readme

* fix imports

* fix imports and readmeExist

* fix imports order

* fix format

* remove unnecessary convert

modules/markup/orgmode/orgmode.go

@@ -0,0 +1,56 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package markup
+
+import (
+	"code.gitea.io/gitea/modules/markup"
+	"code.gitea.io/gitea/modules/markup/markdown"
+
+	"github.com/chaseadamsio/goorgeous"
+	"github.com/russross/blackfriday"
+)
+
+func init() {
+	markup.RegisterParser(Parser{})
+}
+
+// Parser implements markup.Parser for orgmode
+type Parser struct {
+}
+
+// Name implements markup.Parser
+func (Parser) Name() string {
+	return "orgmode"
+}
+
+// Extensions implements markup.Parser
+func (Parser) Extensions() []string {
+	return []string{".org"}
+}
+
+// Render renders orgmode rawbytes to HTML
+func Render(rawBytes []byte, urlPrefix string, metas map[string]string, isWiki bool) []byte {
+	htmlFlags := blackfriday.HTML_USE_XHTML
+	htmlFlags |= blackfriday.HTML_SKIP_STYLE
+	htmlFlags |= blackfriday.HTML_OMIT_CONTENTS
+	renderer := &markdown.Renderer{
+		Renderer:  blackfriday.HtmlRenderer(htmlFlags, "", ""),
+		URLPrefix: urlPrefix,
+		IsWiki:    isWiki,
+	}
+
+	result := goorgeous.Org(rawBytes, renderer)
+	return result
+}
+
+// RenderString reners orgmode string to HTML string
+func RenderString(rawContent string, urlPrefix string, metas map[string]string, isWiki bool) string {
+	return string(Render([]byte(rawContent), urlPrefix, metas, isWiki))
+}
+
+// Render implements markup.Parser
+func (Parser) Render(rawBytes []byte, urlPrefix string, metas map[string]string, isWiki bool) []byte {
+	return Render(rawBytes, urlPrefix, metas, isWiki)
+}