package main

import (
	"github.com/microcosm-cc/bluemonday"
	"github.com/russross/blackfriday"
	"io/ioutil"
	"os"
	"flag"
	"fmt"
)

func main() {
	const (
		flags = 0 |
			blackfriday.HTML_USE_XHTML |
			blackfriday.HTML_USE_SMARTYPANTS |
			blackfriday.HTML_SMARTYPANTS_FRACTIONS |
			blackfriday.HTML_SMARTYPANTS_LATEX_DASHES
		extensions = 0 |
			blackfriday.EXTENSION_NO_INTRA_EMPHASIS |
			blackfriday.EXTENSION_TABLES |
			blackfriday.EXTENSION_FENCED_CODE |
			blackfriday.EXTENSION_AUTOLINK |
			blackfriday.EXTENSION_STRIKETHROUGH |
			blackfriday.EXTENSION_SPACE_HEADERS |
			blackfriday.EXTENSION_HARD_LINE_BREAK |
			blackfriday.EXTENSION_NO_EMPTY_LINE_BEFORE_BLOCK
	)
	var err error

	flag.Parse()

	inFile := os.Stdin
	inFilePath := flag.Arg(0)
	if inFilePath != "" {
		inFile, err = os.Open(inFilePath)
		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}
	}
	defer inFile.Close() // nolint: errcheck

	input, err := ioutil.ReadAll(inFile)
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}

	renderer := blackfriday.HtmlRenderer(flags, "", "")
	unsafe := blackfriday.Markdown(input, renderer, extensions)
	safe := bluemonday.UGCPolicy().SanitizeBytes(unsafe)
	out := os.Stdout
	out.Write(safe)


}