function processFile(blob, fileName) {
        var libs = [];
        if (typeof marked === 'undefined') {
            libs.push(loadScriptPromise('https://cdnjs.cloudflare.com/ajax/libs/marked/12.0.1/marked.min.js'));
        }
        if ((typeof window.jspdf === 'undefined' || typeof window.jspdf.jsPDF === 'undefined') && typeof jsPDF === 'undefined') {
            libs.push(loadScriptPromise('https://cdnjs.cloudflare.com/ajax/libs/jspdf/2.5.1/jspdf.umd.min.js'));
        }

        Promise.all(libs).then(function() {
            var reader = new FileReader();
            reader.onload = function(e) {
                var markdown = e.target.result || '';
                var html = markdown;
                try {
                    if (typeof marked !== 'undefined') html = marked.parse(markdown);
                } catch (err) {
                }

                var temp = document.createElement('div');
                temp.innerHTML = html;
                var text = (temp.textContent || temp.innerText || '').replace(/\r\n?/g, '\n');
                if (!text.trim()) text = ' ';

                var PDFCtor = (window.jspdf && window.jspdf.jsPDF) ? window.jspdf.jsPDF : window.jsPDF;
                if (!PDFCtor) {
                    alert('PDF library failed to load.');
                    return;
                }

                var pdf = new PDFCtor({ orientation: 'p', unit: 'pt', format: 'a4' });
                var margin = 40;
                var lineHeight = 16;
                var pageWidth = pdf.internal.pageSize.getWidth();
                var pageHeight = pdf.internal.pageSize.getHeight();
                var maxWidth = pageWidth - (margin * 2);
                var y = margin;

                pdf.setFont('times', 'normal');
                pdf.setFontSize(12);

                var paragraphs = text.split('\n');
                for (var i = 0; i < paragraphs.length; i++) {
                    var para = paragraphs[i];
                    var lines = pdf.splitTextToSize(para.length ? para : ' ', maxWidth);
                    for (var j = 0; j < lines.length; j++) {
                        if (y > pageHeight - margin) {
                            pdf.addPage();
                            y = margin;
                        }
                        pdf.text(lines[j], margin, y);
                        y += lineHeight;
                    }
                    if (para.trim() === '') y += 6;
                }

                var baseName = fileName.replace(/\.[^.]+$/, '');
                if (baseName === fileName) baseName += '-converted';
                add_file_output(URL.createObjectURL(pdf.output('blob')), baseName + '.pdf');
            };
            reader.readAsText(blob);
        }).catch(function() {
            alert('Could not load markdown/PDF libraries.');
        });
    }







var _loadedScripts = {};
function loadScriptPromise(url) {
    if (_loadedScripts[url]) return _loadedScripts[url];
    _loadedScripts[url] = new Promise(function (resolve, reject) {
        var s = document.createElement('script');
        s.src = url;
        s.onload = resolve;
        s.onerror = reject;
        document.head.appendChild(s);
    });
    return _loadedScripts[url];
}

function replaceAll(find, replace, str) {
    return str.replace(new RegExp(find, 'g'), replace);
}

function beautify(str) {


    var result = '';

    var length = str.length;

    var i = 0;

    var braceCountLeft = 0;
    var braceCountRight = 0;

    var withinQuotes = false;

    while (i < length) {

        var c = str[i];

        if (c == '"' && (i == 0 || c[i - 1] != '\\')) {
            // non-escaped quotes
            withinQuotes = !withinQuotes;
        }

        if (!withinQuotes && (c == '}' || c == '{' || c == ',')) {

            console.log('Start####' + result);

            // look back and remove carriage returns and whitespace that are already there

            var resultIndex = result.length - 1;
            while (resultIndex >= 0 && (result[resultIndex] == ' ' || result[resultIndex] == '\r' || result[resultIndex] == '\n' || result[resultIndex] == '\t')) {

                resultIndex = resultIndex - 1;
                result = result.substr(0, resultIndex + 1);

                console.log('char ' + result[resultIndex] + '-----' + result + 'zzz ' + result.length + ' ' + resultIndex);

            }


            if (c == '{') {
                braceCountLeft++;
                result += c + '\r' + GetTabs(braceCountLeft - braceCountRight);
            } else if (c == '}') {
                braceCountRight++;
                // precede with carriage return
                result += '\r' + GetTabs(braceCountLeft - braceCountRight) + c;
            } else if (c == ',') {
                result += c + '\r' + GetTabs(braceCountLeft - braceCountRight);
            }

            var nextChar = '';

            // advance through whitespace and remove carriage returns that are already there
            while (i < length && (str[i + 1] == ' ' || str[i + 1] == '\r' || str[i + 1] == '\n' || str[i + 1] == '\t')) {
                i++;
            }

        } else {

            result += str[i];

        }


        i++;

    }

    return result;

}

function GetTabs(count) {

    var result = '';

    for (var i = 0; i < count; i++) {
        result += '    ';
    }

    return result;

}