importSched.js

function readCalFile() {
    var files = $('#schedInput')[0].files;
    if (!files || !files.length) {
        return;
    }

    var file = files[0];
    var reader = new FileReader();
    // If we use onloadend, we need to check the readyState.
    reader.onloadend = function (evt) {
        if (evt.target.readyState === FileReader.DONE) {
            // DONE == 2
            var secArr = parseCalFile(evt.target.result);
            if (secArr.length) {
                $('#importSubmit').prop('disabled', false);
            } else {
                $('#importSubmit').prop('disabled', true);
            }
            $('#secsToImport').empty();
            for (var i = 0; i < secArr.length; i++) {
                $('#secsToImport').append('<input type="checkbox" name="' + FormatID(secArr[i]).join('-') + '" checked><span style="display:inline">' + FormatID(secArr[i]).join(' ') + '</span><br>');
            }
            return secArr;
        } else {
            $('#importSubmit').prop('disabled', true);
            return [];
        }
    };
    var blob = file.slice(0, file.size - 1);
    reader.readAsBinaryString(blob);
}

function parseCalFile(rawCal) {
    function FilterFunc(line) {
        if (line.split(':')[0] === 'SUMMARY') {
            return 1;
        }
    }
    function MapFunc(line) {
        return line.split('\r')[0].replace(/ /g, '').split(':')[1];
    }

    var secs = rawCal.split('\n').filter(FilterFunc).map(MapFunc);
    var uniq = secs.filter(function (elem, pos) {
        return secs.indexOf(elem) === pos;
    });
    return uniq;
}