introduction

sometimes we need more information to describe a markdown content. such as it's title, language of the content and so on. but there is still no any solution to carry such information. this is a package that define a header of the markdown file. the header can contain all the information you wanna carry but don't wanna make them visible. we will introduce the header specified.

syntax of header

it looks like below

<!-- + 
title: test title
overview: overview of the content
cate: sample
tags: #hello world, #tag1, #tag2
lang: en
published_at: 2020-08-08T08:00:00Z
updated_at: 2020-08-08T08:00:00Z
+ -->

I choose <!-- + + --> as a wrapper because it can make the header hidden. the content of the header just like a http header presentation. the content is composed by key-value pairs which seperated by :, the whitespace around : will be ignored. the key of the key-value pair only accept number, alpha, -, _ and must lead with alpha. normally the has no limitation but some exception. the value limitation of specified key list below.

• urlid: only accept alpha, number, _, -
• tags: tags will begin with a #, and seperated by ,, whitespace around , will be ignored
• published_at: must a RFC3339 time format string

usage

import md

f, e := os.Open("./blog.md")
if e != nil {
	log.Print(e)
	return
}

// this will parse the input then output the head and body without head
head, body, err := md.Parse(f)

// this will parse the input then output the head.
head, err := md.ParseHead(f)

API

type MdHead struct {
	Title       string
	Urlid       string
	Overview    string
	Cate        string
	Lang        string
	Tags        []string
	Image       string
	PublishedAt time.Time
	UpdatedAt   time.Time
	Extra       map[string]string
}

func Parse(r io.Reader) (head MdHead, body []byte, error);

func ParseHead(r io.Reader) (head MdHead, error);