package main

import (
	"bytes"
	"flag"
	// "fmt"
	"io"
	"log"
	"os"

	"github.com/yuin/goldmark"
	"github.com/yuin/goldmark-meta"
	// "github.com/yuin/goldmark/extension"
	"github.com/yuin/goldmark/parser"
)

func LoadNote(r io.Reader) (interface{}, error) {
	var buf bytes.Buffer
	markdown := goldmark.New(
		goldmark.WithExtensions(
			meta.Meta,
		),
	)
	context := parser.NewContext()
	io.Copy(&buf, r)
	if err := markdown.Convert(buf.Bytes(), &buf, parser.WithContext(context)); err != nil {
		return nil, err
	}
	metaData := meta.Get(context)
	log.Printf("%#+v\n", metaData)

	return nil, nil
}

func main() {
	var (
		note string
	)

	flag.StringVar(&note, "note", "demo.md", "filename of test note")
	flag.Parse()

	f, err := os.Open(note)
	if err != nil {
		log.Fatalf("error opening markdown file: %s\n", err)
	}

	LoadNote(f)
}