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

vendor/github.com/chaseadamsio/goorgeous/header.go

@@ -0,0 +1,70 @@
+package goorgeous
+
+import (
+	"bufio"
+	"bytes"
+	"regexp"
+	"strings"
+)
+
+// ExtractOrgHeaders finds and returns all of the headers
+// from a bufio.Reader and returns them as their own byte slice
+func ExtractOrgHeaders(r *bufio.Reader) (fm []byte, err error) {
+	var out bytes.Buffer
+	endOfHeaders := true
+	for endOfHeaders {
+		p, err := r.Peek(2)
+		if err != nil {
+			return nil, err
+		}
+		if !charMatches(p[0], '#') && !charMatches(p[1], '+') {
+			endOfHeaders = false
+			break
+		}
+		line, _, err := r.ReadLine()
+		if err != nil {
+			return nil, err
+		}
+		out.Write(line)
+		out.WriteByte('\n')
+	}
+	return out.Bytes(), nil
+}
+
+var reHeader = regexp.MustCompile(`^#\+(\w+?): (.*)`)
+
+// OrgHeaders find all of the headers from a byte slice and returns
+// them as a map of string interface
+func OrgHeaders(input []byte) (map[string]interface{}, error) {
+	out := make(map[string]interface{})
+	scanner := bufio.NewScanner(bytes.NewReader(input))
+
+	for scanner.Scan() {
+		data := scanner.Bytes()
+		if !charMatches(data[0], '#') && !charMatches(data[1], '+') {
+			return out, nil
+		}
+		matches := reHeader.FindSubmatch(data)
+
+		if len(matches) < 3 {
+			continue
+		}
+
+		key := string(matches[1])
+		val := matches[2]
+		switch {
+		case strings.ToLower(key) == "tags" || strings.ToLower(key) == "categories" || strings.ToLower(key) == "aliases":
+			bTags := bytes.Split(val, []byte(" "))
+			tags := make([]string, len(bTags))
+			for idx, tag := range bTags {
+				tags[idx] = string(tag)
+			}
+			out[key] = tags
+		default:
+			out[key] = string(val)
+		}
+
+	}
+	return out, nil
+
+}