export done

(function() {
    var text = "";
    var saved_file_entry, file_display_path;

    function get_data_as_text() {
        var rss_url = "http://lenta.ru/rss";
        var xhr = new XMLHttpRequest();
        xhr.open("GET", rss_url, true);
        xhr.send(null);
        xhr.onreadystatechange = function() {
            if (4 == xhr.readyState && 200 == xhr.status) {
                /*var items = xhr.ResponseXML.getElementsByTagName("item");
                for (var i = 0; i < items.length; i++) {
                    text += $(items[i]).find("title").html() + '\n';
                    text += '\t' + $(items[i]).find("description").html() + '\n';
                    text += '\n';
                }*/
                var xml = xhr.responseXML;
                var items = xml.getElementsByTagName("item");
                for (var i = 0; i < items.length; i++) {
                    text += $(items[i]).find("title").html() + '\n';
                    text += '\t' + $(items[i]).find("description").html() + '\n';
                    text += '\n';
                    for (j = 0; j < 70; j++) text += "=";
                    text += '\n';
                }



                text = text.replace(/<!\[CDATA\[/g, '').replace(/\]\]>/g, '');
                return true;

            }
        }

        return true;
    }

    function save_to_entry() {
        currentEntry = text;

        var blob = new Blob([text], {type: 'text/plain'});
        currentEntry.createWriter(function(writer) {
            writer.onwrite = function() {
                writer.onwrite = null;
                writer.write(blob);
            }
            writer.truncate(blob.size);
        });
    }




    var savedFileEntry, fileDisplayPath;

    function getTodosAsText(callback) {
        //var text = "lorem ipsum dolor sit amet";
        callback(text);
    }

    function exportToFileEntry(fileEntry) {
        savedFileEntry = fileEntry;

        var status = document.getElementById('status');

        // Use this to get a file path appropriate for displaying
        chrome.fileSystem.getDisplayPath(fileEntry, function(path) {
            fileDisplayPath = path;
            status.innerText = 'Exporting to '+path;
        });

        getTodosAsText( function(contents) {

            fileEntry.createWriter(function(fileWriter) {

            var truncated = false;
            var blob = new Blob([contents]);

            fileWriter.onwriteend = function(e) {
                if (!truncated) {
                    truncated = true;
                    // You need to explicitly set the file size to truncate
                    // any content that might have been there before
                    this.truncate(blob.size);
                    return;
                }
                status.innerText = 'Export to '+fileDisplayPath+' completed';
            };

            fileWriter.onerror = function(e) {
                status.innerText = 'Export failed: '+e.toString();
            };

            fileWriter.write(blob);

            });
        });
    }

    function doExportToDisk() {
        if (savedFileEntry) {

            exportToFileEntry(savedFileEntry);

        } else {

            chrome.fileSystem.chooseEntry( {
                type: 'saveFile',
                suggestedName: 'todos.txt',
                accepts: [ { description: 'Text files (*.txt)',
                       extensions: ['txt']} ],
                acceptsAllTypes: true
            }, exportToFileEntry);

        }
    }

    document.getElementById("export").addEventListener("click", function() {
        if (true == get_data_as_text()) {
            doExportToDisk();
        }
    });

})();