Imrpovement of second date, now included in analyze prosedure.

Dates can be selected via calender.
Simple +/- calculator from command line.
Few other fixes and improvements.

calwindow.cpp

@@ -1,5 +1,6 @@
 #include "calwindow.h"
 #include "ui_calwindow.h"
+#include "mainwindow.h"
 
 CalWindow::CalWindow(QWidget *parent) :
     QDialog(parent),
@@ -12,3 +13,23 @@ CalWindow::~CalWindow()
 {
     delete ui;
 }
+
+void CalWindow::on_date_clicked()
+{
+    QDate cd(year,mm,dd);
+    cd = ui->calendarWidget->selectedDate();
+    year = cd.year();
+    dd = cd.day();
+    mm = cd.month();
+    emit buttonpressed();
+}
+
+void CalWindow::on_seconddate_clicked()
+{
+    QDate cd(year,mm,dd);
+    cd = ui->calendarWidget->selectedDate();
+    y2 = cd.year();
+    d2 = cd.day();
+    m2 = cd.month();
+    emit buttonpressed();
+}

calwindow.h

@@ -18,6 +18,14 @@ class CalWindow : public QDialog
     explicit CalWindow(QWidget *parent = nullptr);
     ~CalWindow();
 
+signals:
+    void buttonpressed();
+
+private slots:
+    void on_date_clicked();
+
+    void on_seconddate_clicked();
+
 private:
     Ui::CalWindow *ui;
 

calwindow.ui

@@ -6,17 +6,48 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>341</width>
-    <height>257</height>
+    <width>346</width>
+    <height>278</height>
    </rect>
   </property>
   <property name="windowTitle">
    <string>Dialog</string>
   </property>
-  <layout class="QHBoxLayout" name="horizontalLayout">
+  <layout class="QVBoxLayout" name="verticalLayout">
    <item>
     <widget class="QCalendarWidget" name="calendarWidget"/>
    </item>
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout">
+     <item>
+      <widget class="QPushButton" name="date">
+       <property name="text">
+        <string>Date</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <spacer name="horizontalSpacer">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>40</width>
+         <height>20</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+     <item>
+      <widget class="QPushButton" name="seconddate">
+       <property name="text">
+        <string>Second date</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
   </layout>
  </widget>
  <resources/>

downloadmanager.cpp

@@ -0,0 +1,212 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "downloadmanager.h"
+
+#include <QTextStream>
+
+#include <cstdio>
+
+using namespace std;
+
+DownloadManager::DownloadManager(QObject *parent)
+    : QObject(parent)
+{
+}
+
+void DownloadManager::append(const QStringList &urls)
+{
+    for (const QString &urlAsString : urls)
+        append(QUrl::fromEncoded(urlAsString.toLocal8Bit()));
+
+    if (downloadQueue.isEmpty())
+        QTimer::singleShot(0, this, SIGNAL(finished()));
+}
+
+void DownloadManager::append(const QUrl &url)
+{
+    if (downloadQueue.isEmpty())
+        QTimer::singleShot(0, this, SLOT(startNextDownload()));
+
+    downloadQueue.enqueue(url);
+    ++totalCount;
+}
+
+QString DownloadManager::saveFileName(const QUrl &url)
+{
+    QString path = url.path();
+    QString basename = QFileInfo(path).fileName();
+
+    if (basename.isEmpty())
+        basename = "download";
+
+    if (QFile::exists(basename)) {
+        // already exists, don't overwrite
+        int i = 0;
+        basename += '.';
+        while (QFile::exists(basename + QString::number(i)))
+            ++i;
+
+        basename += QString::number(i);
+    }
+
+    return basename;
+}
+
+void DownloadManager::startNextDownload()
+{
+    if (downloadQueue.isEmpty()) {
+        printf("%d/%d files downloaded successfully\n", downloadedCount, totalCount);
+        emit finished();
+        return;
+    }
+
+    QUrl url = downloadQueue.dequeue();
+
+    QString filename = saveFileName(url);
+    output.setFileName(filename);
+    if (!output.open(QIODevice::WriteOnly)) {
+        fprintf(stderr, "Problem opening save file '%s' for download '%s': %s\n",
+                qPrintable(filename), url.toEncoded().constData(),
+                qPrintable(output.errorString()));
+
+        startNextDownload();
+        return;                 // skip this download
+    }
+
+    QNetworkRequest request(url);
+    currentDownload = manager.get(request);
+    connect(currentDownload, SIGNAL(downloadProgress(qint64,qint64)),
+            SLOT(downloadProgress(qint64,qint64)));
+    connect(currentDownload, SIGNAL(finished()),
+            SLOT(downloadFinished()));
+    connect(currentDownload, SIGNAL(readyRead()),
+            SLOT(downloadReadyRead()));
+
+    // prepare the output
+    printf("Downloading %s...\n", url.toEncoded().constData());
+    downloadTimer.start();
+}
+
+void DownloadManager::downloadProgress(qint64 bytesReceived, qint64 bytesTotal)
+{
+    progressBar.setStatus(bytesReceived, bytesTotal);
+
+    // calculate the download speed
+    double speed = bytesReceived * 1000.0 / downloadTimer.elapsed();
+    QString unit;
+    if (speed < 1024) {
+        unit = "bytes/sec";
+    } else if (speed < 1024*1024) {
+        speed /= 1024;
+        unit = "kB/s";
+    } else {
+        speed /= 1024*1024;
+        unit = "MB/s";
+    }
+
+    progressBar.setMessage(QString::fromLatin1("%1 %2")
+                           .arg(speed, 3, 'f', 1).arg(unit));
+    progressBar.update();
+}
+
+void DownloadManager::downloadFinished()
+{
+    progressBar.clear();
+    output.close();
+
+    if (currentDownload->error()) {
+        // download failed
+        fprintf(stderr, "Failed: %s\n", qPrintable(currentDownload->errorString()));
+        output.remove();
+    } else {
+        // let's check if it was actually a redirect
+        if (isHttpRedirect()) {
+            reportRedirect();
+            output.remove();
+        } else {
+            printf("Succeeded.\n");
+            ++downloadedCount;
+        }
+    }
+
+    currentDownload->deleteLater();
+    startNextDownload();
+}
+
+void DownloadManager::downloadReadyRead()
+{
+    output.write(currentDownload->readAll());
+}
+
+bool DownloadManager::isHttpRedirect() const
+{
+    int statusCode = currentDownload->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
+    return statusCode == 301 || statusCode == 302 || statusCode == 303
+           || statusCode == 305 || statusCode == 307 || statusCode == 308;
+}
+
+void DownloadManager::reportRedirect()
+{
+    int statusCode = currentDownload->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
+    QUrl requestUrl = currentDownload->request().url();
+    QTextStream(stderr) << "Request: " << requestUrl.toDisplayString()
+                        << " was redirected with code: " << statusCode
+                        << '\n';
+
+    QVariant target = currentDownload->attribute(QNetworkRequest::RedirectionTargetAttribute);
+    if (!target.isValid())
+        return;
+    QUrl redirectUrl = target.toUrl();
+    if (redirectUrl.isRelative())
+        redirectUrl = requestUrl.resolved(redirectUrl);
+    QTextStream(stderr) << "Redirected to: " << redirectUrl.toDisplayString()
+                        << '\n';
+}