[impl] support MarkDown

Author: binacs

README.md

@@ -1,2 +1,17 @@
 # pastebin
 PasteBin implement, written in Go.
+
+
+## 0 Quick Start
+
+提供多语法解析为 `HTML` 的接口实现。
+
+
+## 1 MarkDown
+
+引用包 [blackfriday.v2](https://godoc.org/gopkg.in/russross/blackfriday.v2) ，其 `GitHub` 地址在 [这里](https://github.com/russross/blackfriday) 。
+
+>   `bytes.Replace([]byte(input), []byte("\r"), nil, -1)` 消除 `\r` 换行带来的格式影响；
+>
+>   `blackfriday.HardLineBreak` 参数旨在消除两行连成一行的情况；
+

example/main.go

@@ -0,0 +1,17 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+
+	"github.com/binacsgo/pastebin"
+)
+
+func main() {
+	bytes, err := ioutil.ReadFile("../README.md")
+	if err != nil {
+		panic(err)
+	}
+	output, _ := pastebin.ParseContentMD(string(bytes))
+	fmt.Println(output)
+}

go.mod

@@ -0,0 +1,9 @@
+module github.com/binacsgo/pastebin
+
+go 1.14
+
+require (
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/russross/blackfriday/v2 v2.0.1
+	github.com/shurcooL/sanitized_anchor_name v1.0.0 // indirect
+)

go.sum

@@ -0,0 +1,6 @@
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/russross/blackfriday/v2 v2.0.1 h1:lPqVAte+HuHNfhJ/0LC98ESWRz8afy9tM/0RK8m9o+Q=
+github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/shurcooL/sanitized_anchor_name v1.0.0 h1:PdmoCO6wvbs+7yrJyMORt4/BmY5IYyJwS/kOiWx8mHo=
+github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=

interface.go

@@ -0,0 +1,7 @@
+package pastebin
+
+// PasteBin the interface def.
+type PasteBin interface {
+	Syntax() string
+	ParseContent(string) (string, error)
+}

markdown.go

@@ -0,0 +1,35 @@
+package pastebin
+
+import (
+	"bytes"
+
+	"github.com/russross/blackfriday/v2"
+)
+
+var gMarkDownImpl *MarkDownImpl
+
+func init() {
+	gMarkDownImpl = new(MarkDownImpl)
+}
+
+// ParseContentMD parse the markdown syntax directly
+func ParseContentMD(input string) (string, error) {
+	return gMarkDownImpl.ParseContent(input)
+}
+
+// MarkDownImpl the markdown impl.
+type MarkDownImpl struct{}
+
+// Syntax return the syntax
+func (impl *MarkDownImpl) Syntax() string {
+	return "markdown"
+}
+
+// ParseContent return the
+func (impl *MarkDownImpl) ParseContent(input string) (string, error) {
+	output := blackfriday.Run(
+		bytes.Replace([]byte(input), []byte("\r"), nil, -1),
+		blackfriday.WithExtensions(blackfriday.CommonExtensions|blackfriday.HardLineBreak),
+	)
+	return string(output), nil
+}

types.go

@@ -0,0 +1,12 @@
+package pastebin
+
+import "time"
+
+// PasteObj the definition
+type PasteObj struct {
+	Poster     string
+	Syntax     string // enum
+	Content    string
+	TinyURL    string
+	Expiration time.Duration
+}