From 24fbb3b7aca8dd5b957397a046d3cb71a00b324c Mon Sep 17 00:00:00 2001
From: Aleks Kissinger <aleks0@gmail.com>
Date: Sun, 21 Oct 2018 13:33:13 +0200
Subject: add automatic update checking (closes #33)

---
 src/gui/mainmenu.cpp |  4 ++--
 src/tikzit.cpp       | 41 ++++++++++++++++++++++++++++++++++++++++-
 src/tikzit.h         |  4 ++--
 3 files changed, 44 insertions(+), 5 deletions(-)

diff --git a/src/gui/mainmenu.cpp b/src/gui/mainmenu.cpp
index b530f58..8166c59 100644
--- a/src/gui/mainmenu.cpp
+++ b/src/gui/mainmenu.cpp
@@ -255,10 +255,10 @@ void MainMenu::on_actionAbout_triggered()
 
 void MainMenu::on_actionCheck_for_updates_automatically_triggered()
 {
-    qDebug() << "check automatically:" << ui.actionCheck_for_updates_automatically->isChecked();
+    tikzit->setCheckForUpdates(ui.actionCheck_for_updates_automatically->isChecked());
 }
 
 void MainMenu::on_actionCheck_now_triggered()
 {
-    qDebug() << "check now";
+    tikzit->checkForUpdates();
 }
diff --git a/src/tikzit.cpp b/src/tikzit.cpp
index fc81739..5d1fef4 100644
--- a/src/tikzit.cpp
+++ b/src/tikzit.cpp
@@ -25,6 +25,9 @@
 #include <QSettings>
 #include <QDebug>
 #include <QMessageBox>
+#include <QRegularExpression>
+#include <QVersionNumber>
+#include <QNetworkAccessManager>
 
 // application-level instance of Tikzit
 Tikzit *tikzit;
@@ -119,6 +122,10 @@ void Tikzit::init()
     }
 
     setCheckForUpdates(check.toBool());
+
+    if (check.toBool()) {
+        checkForUpdates();
+    }
 }
 
 //QMenuBar *Tikzit::mainMenu() const
@@ -352,12 +359,44 @@ void Tikzit::setCheckForUpdates(bool check)
 
 void Tikzit::checkForUpdates()
 {
+    QNetworkAccessManager *manager = new QNetworkAccessManager(this);
+    connect(manager, SIGNAL(finished(QNetworkReply*)),
+            this, SLOT(updateReply(QNetworkReply*)));
 
+    manager->get(QNetworkRequest(QUrl("http://tikzit.github.io/latest-version.txt")));
 }
 
 void Tikzit::updateReply(QNetworkReply *reply)
 {
-
+    if (!reply->isReadable()) return;
+
+    QByteArray data = reply->read(200);
+    QString strLatest = QString::fromUtf8(data).simplified();
+    qDebug() << "got response:" << strLatest;
+
+    QVersionNumber current = QVersionNumber::fromString(TIKZIT_VERSION).normalized();
+    QVersionNumber latest = QVersionNumber::fromString(strLatest).normalized();
+
+    // check for an optional RC suffix. Any non-RC versions are considered later than RC versions.
+    QRegularExpression re("-[rR][cC]([0-9]+)$");
+    QRegularExpressionMatch m;
+    m = re.match(TIKZIT_VERSION);
+    int rcCurrent = (m.hasMatch()) ? m.captured(1).toInt() : 1000;
+    m = re.match(strLatest);
+    int rcLatest = (m.hasMatch()) ? m.captured(1).toInt() : 1000;
+
+    //qDebug() << "latest" << latest << "rc" << rcLatest;
+    //qDebug() << "current" << current << "rc" << rcCurrent;
+
+    if (latest > current || (latest == current && rcLatest > rcCurrent)) {
+        QMessageBox::information(0,
+          tr("Update available"),
+          "<p><b>A new version of TikZiT is available!</b></p>"
+          "<p><i>current version: " TIKZIT_VERSION "<br />"
+          "latest version: " + strLatest + "</i></p>"
+          "<p>Download it now from: "
+          "<a href=\"https://tikzit.github.io\">tikzit.github.io</a>.</p>");
+    }
 }
 
 //StylePalette *Tikzit::stylePalette() const
diff --git a/src/tikzit.h b/src/tikzit.h
index 87599e7..635ee5e 100644
--- a/src/tikzit.h
+++ b/src/tikzit.h
@@ -49,7 +49,7 @@
 #ifndef TIKZIT_H
 #define TIKZIT_H
 
-#define TIKZIT_VERSION "2.0-rc1"
+#define TIKZIT_VERSION "2.0-rc3"
 
 #include "mainwindow.h"
 #include "mainmenu.h"
@@ -69,7 +69,7 @@
 #include <QMainWindow>
 #include <QFont>
 #include <QColor>
-#include <QNetworkAccessManager>
+#include <QNetworkReply>
 
 // Number of pixels between (0,0) and (1,0) at 100% zoom level. This should be
 // divisible by 8 to avoid rounding errors with e.g. grid-snapping.
-- 
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