split a md file & convert html to md

splitmd.js

var fs = require('fs');

try {fs.mkdirSync('out');}
catch(ex){}

var co = fs.readFileSync('a.md', 'utf-8');

var files = co.split(/<split>123<\/split>/g);

var summary = '';
//var pre = "{% raw %}\n",
//    sub = "\n{% endraw %}";

for(var i = 0; i < files.length; i++)
{
	fs.writeFileSync('out/' + i + '.md', files[i], {encoding: 'utf-8'});
	var rms = files[i].match(/^#+\x20(.+?)(?:\x20#+)?$/m);
	var name = rms? rms[1]: "";
	summary += '+ [' + name + '](' + i + '.md)\n';
}

fs.writeFileSync('out/SUMMARY.md', summary, {encoding: 'utf-8'});

tomd.js

var toMD = require('to-markdown');
var fs = require('fs');
var myConventors = require('./my-conventors');

var co = fs.readFileSync('a.html', 'utf-8')
           .replace(/(<h1[^>]*>)/g, "<split>123</split>$1");

var tmpConv = [{
        filter: function(n) {
            var classes = n.className.split(' ');
            return n.nodeName === 'SPAN' && 
                classes.indexOf('math') != -1;
        },
        replacement: function (content) {
          return '`' + content + '`';
        }
    }, 
    {
        filter: function(n) {
            var classes = n.className.split(' ');
            return n.nodeName === 'DIV' && 
                classes.indexOf('math') != -1;
        },
        replacement: function (content) {
          return '\n\n```\n' + content + '\n```\n\n';
        }
}];

var md = toMD(co, {
	gfm: true,
	converters: tmpConv.concat(myConventors)
});

fs.writeFileSync('a.md', md, {encoding: 'utf-8'});

console.log('done...');