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/markdown/markdown.go

@@ -0,0 +1,200 @@
+// Copyright 2014 The Gogs 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 markdown
+
+import (
+	"bytes"
+	"strings"
+
+	"code.gitea.io/gitea/modules/markup"
+	"code.gitea.io/gitea/modules/setting"
+
+	"github.com/russross/blackfriday"
+)
+
+// Renderer is a extended version of underlying render object.
+type Renderer struct {
+	blackfriday.Renderer
+	URLPrefix string
+	IsWiki    bool
+}
+
+// Link defines how formal links should be processed to produce corresponding HTML elements.
+func (r *Renderer) Link(out *bytes.Buffer, link []byte, title []byte, content []byte) {
+	if len(link) > 0 && !markup.IsLink(link) {
+		if link[0] != '#' {
+			lnk := string(link)
+			if r.IsWiki {
+				lnk = markup.URLJoin("wiki", lnk)
+			}
+			mLink := markup.URLJoin(r.URLPrefix, lnk)
+			link = []byte(mLink)
+		}
+	}
+
+	r.Renderer.Link(out, link, title, content)
+}
+
+// List renders markdown bullet or digit lists to HTML
+func (r *Renderer) List(out *bytes.Buffer, text func() bool, flags int) {
+	marker := out.Len()
+	if out.Len() > 0 {
+		out.WriteByte('\n')
+	}
+
+	if flags&blackfriday.LIST_TYPE_DEFINITION != 0 {
+		out.WriteString("<dl>")
+	} else if flags&blackfriday.LIST_TYPE_ORDERED != 0 {
+		out.WriteString("<ol class='ui list'>")
+	} else {
+		out.WriteString("<ul class='ui list'>")
+	}
+	if !text() {
+		out.Truncate(marker)
+		return
+	}
+	if flags&blackfriday.LIST_TYPE_DEFINITION != 0 {
+		out.WriteString("</dl>\n")
+	} else if flags&blackfriday.LIST_TYPE_ORDERED != 0 {
+		out.WriteString("</ol>\n")
+	} else {
+		out.WriteString("</ul>\n")
+	}
+}
+
+// ListItem defines how list items should be processed to produce corresponding HTML elements.
+func (r *Renderer) ListItem(out *bytes.Buffer, text []byte, flags int) {
+	// Detect procedures to draw checkboxes.
+	prefix := ""
+	if bytes.HasPrefix(text, []byte("<p>")) {
+		prefix = "<p>"
+	}
+	switch {
+	case bytes.HasPrefix(text, []byte(prefix+"[ ] ")):
+		text = append([]byte(`<span class="ui fitted disabled checkbox"><input type="checkbox" disabled="disabled" /><label /></span>`), text[3+len(prefix):]...)
+		if prefix != "" {
+			text = bytes.Replace(text, []byte(prefix), []byte{}, 1)
+		}
+	case bytes.HasPrefix(text, []byte(prefix+"[x] ")):
+		text = append([]byte(`<span class="ui checked fitted disabled checkbox"><input type="checkbox" checked="" disabled="disabled" /><label /></span>`), text[3+len(prefix):]...)
+		if prefix != "" {
+			text = bytes.Replace(text, []byte(prefix), []byte{}, 1)
+		}
+	}
+	r.Renderer.ListItem(out, text, flags)
+}
+
+// Note: this section is for purpose of increase performance and
+// reduce memory allocation at runtime since they are constant literals.
+var (
+	svgSuffix         = []byte(".svg")
+	svgSuffixWithMark = []byte(".svg?")
+)
+
+// Image defines how images should be processed to produce corresponding HTML elements.
+func (r *Renderer) Image(out *bytes.Buffer, link []byte, title []byte, alt []byte) {
+	prefix := r.URLPrefix
+	if r.IsWiki {
+		prefix = markup.URLJoin(prefix, "wiki", "src")
+	}
+	prefix = strings.Replace(prefix, "/src/", "/raw/", 1)
+	if len(link) > 0 {
+		if markup.IsLink(link) {
+			// External link with .svg suffix usually means CI status.
+			// TODO: define a keyword to allow non-svg images render as external link.
+			if bytes.HasSuffix(link, svgSuffix) || bytes.Contains(link, svgSuffixWithMark) {
+				r.Renderer.Image(out, link, title, alt)
+				return
+			}
+		} else {
+			lnk := string(link)
+			lnk = markup.URLJoin(prefix, lnk)
+			lnk = strings.Replace(lnk, " ", "+", -1)
+			link = []byte(lnk)
+		}
+	}
+
+	out.WriteString(`<a href="`)
+	out.Write(link)
+	out.WriteString(`">`)
+	r.Renderer.Image(out, link, title, alt)
+	out.WriteString("</a>")
+}
+
+// RenderRaw renders Markdown to HTML without handling special links.
+func RenderRaw(body []byte, urlPrefix string, wikiMarkdown bool) []byte {
+	htmlFlags := 0
+	htmlFlags |= blackfriday.HTML_SKIP_STYLE
+	htmlFlags |= blackfriday.HTML_OMIT_CONTENTS
+	renderer := &Renderer{
+		Renderer:  blackfriday.HtmlRenderer(htmlFlags, "", ""),
+		URLPrefix: urlPrefix,
+		IsWiki:    wikiMarkdown,
+	}
+
+	// set up the parser
+	extensions := 0
+	extensions |= blackfriday.EXTENSION_NO_INTRA_EMPHASIS
+	extensions |= blackfriday.EXTENSION_TABLES
+	extensions |= blackfriday.EXTENSION_FENCED_CODE
+	extensions |= blackfriday.EXTENSION_STRIKETHROUGH
+	extensions |= blackfriday.EXTENSION_NO_EMPTY_LINE_BEFORE_BLOCK
+
+	if setting.Markdown.EnableHardLineBreak {
+		extensions |= blackfriday.EXTENSION_HARD_LINE_BREAK
+	}
+
+	body = blackfriday.Markdown(body, renderer, extensions)
+	return body
+}
+
+var (
+	// MarkupName describes markup's name
+	MarkupName = "markdown"
+)
+
+func init() {
+	markup.RegisterParser(Parser{})
+}
+
+// Parser implements markup.Parser
+type Parser struct {
+}
+
+// Name implements markup.Parser
+func (Parser) Name() string {
+	return MarkupName
+}
+
+// Extensions implements markup.Parser
+func (Parser) Extensions() []string {
+	return setting.Markdown.FileExtensions
+}
+
+// Render implements markup.Parser
+func (Parser) Render(rawBytes []byte, urlPrefix string, metas map[string]string, isWiki bool) []byte {
+	return RenderRaw(rawBytes, urlPrefix, isWiki)
+}
+
+// Render renders Markdown to HTML with all specific handling stuff.
+func Render(rawBytes []byte, urlPrefix string, metas map[string]string) []byte {
+	return markup.Render("a.md", rawBytes, urlPrefix, metas)
+}
+
+// RenderString renders Markdown to HTML with special links and returns string type.
+func RenderString(raw, urlPrefix string, metas map[string]string) string {
+	return markup.RenderString("a.md", raw, urlPrefix, metas)
+}
+
+// RenderWiki renders markdown wiki page to HTML and return HTML string
+func RenderWiki(rawBytes []byte, urlPrefix string, metas map[string]string) string {
+	return markup.RenderWiki("a.md", rawBytes, urlPrefix, metas)
+}
+
+// IsMarkdownFile reports whether name looks like a Markdown file
+// based on its extension.
+func IsMarkdownFile(name string) bool {
+	return markup.IsMarkupFile(name, MarkupName)
+}