feat: forward users to plasma-welcome if it is installed

data/qrc/main.qml

@@ -167,6 +167,7 @@ Window {
         property string autostart:              qsTr("Show on next startup")
         property string customize:              qsTr("Customise")
         property string close:                  qsTr("Close")
+        property string learnPlasma:            qsTr("Learn Plasma")
     }
     QtObject {
         WebChannel.id: "xfceTr"

data/qrc/web/css/app.css

@@ -91,6 +91,15 @@ body {
 #live.active {
     display: initial;
 }
+#plasma-welcome {
+    display: none;
+}
+#plasma-welcome.showing {
+    display: initial;
+}
+#close.hidden {
+    display: none;
+}
 a.news-link:not([href]):not([tabindex]) {
     color: #00a489;
 }

data/qrc/web/home.html

@@ -161,9 +161,12 @@ <h4>{{homeTrans.supportHeader}}</h4>
                     ng-model="autostart" onclick="updateAutoStart()">
                     {{homeTrans.autostart}}
                 </checkbox>
-                <button id="close" class="btn btn-sm btn-warning font-weight-bold de-footer" data-de="xfce" onclick="delayedClick('aqrc:///web/xfce.html')" lang="en">
+                <button id="customize" class="btn btn-sm btn-warning font-weight-bold de-footer" data-de="xfce" onclick="delayedClick('aqrc:///web/xfce.html')" lang="en">
                     <i class="fa fa-arrow-right"></i> {{homeTrans.customize}}
                 </button>
+                <button id="plasma-welcome" class="btn btn-sm btn-danger ml-3" onclick="bridge.close()" lang="en">
+                    {{homeTrans.learnPlasma}}
+                </button>
                 <button id="close" class="btn btn-sm btn-danger ml-3" onclick="bridge.close()" lang="en">
                     <i class="fa fa-times"></i> {{homeTrans.close}}
                 </button>

data/qrc/web/js/app.js

@@ -69,6 +69,12 @@ window.onload = function () {
                 document.getElementById("live").classList.add("active");
             }
         }
+        if (document.getElementById("plasma-welcome") !== null) {
+            if (launcher.plasmaWelcomeInstalled) {
+                document.getElementById("plasma-welcome").classList.add("showing");
+                document.getElementById("close").classList.add("hidden");
+            }
+        }
 
         var deHelpElms = document.querySelectorAll(".de-help,.de-footer");
         for (var i = 0; i < deHelpElms.length; i++) {
@@ -116,6 +122,7 @@ app.controller('WelcomeCtrl', function($scope) {
   $scope.xfceLayout = xfceLayout;
 
   $scope.autostart = bridge.enabled;
+  $scope.plasmaWelcomeInstalled = launcher.plasmaWelcomeInstalled;
 
   $scope.isDE = function(desktop) {
     console.log("does " + bridge.de + " include " + desktop + "?");

src/include/launcher.h

@@ -10,7 +10,10 @@ class Launcher : public QObject
     ~Launcher();
     Q_INVOKABLE void launch(const QString &program);
     Q_INVOKABLE QString currentDE();
+    Q_PROPERTY(bool plasmaWelcomeInstalled MEMBER m_plasmaWelcomeInstalled CONSTANT)
+    bool programExists(const QString& name);
 protected:
     QProcess *m_process;
+    bool m_plasmaWelcomeInstalled;
 };
 #endif

src/launcher.cpp

@@ -16,12 +16,19 @@
     along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
+#include <QCoreApplication>
 #include "launcher.h"
 
 Launcher::Launcher(QObject *parent) :
     QObject(parent),
     m_process(new QProcess(this))
 {
+    m_plasmaWelcomeInstalled = programExists("plasma-welcome");
+    connect(QCoreApplication::instance(), &QCoreApplication::aboutToQuit, QCoreApplication::instance(), [installed = m_plasmaWelcomeInstalled] {
+        if (installed) {
+            QProcess::startDetached("plasma-welcome", {});
+        }
+    });
 }
 void Launcher::launch(const QString &program)
 {
@@ -36,5 +43,15 @@ QString Launcher::currentDE()
     }
     return output;
 }
+bool Launcher::programExists(const QString &name)
+{
+    QProcess findProcess;
+    findProcess.start("which", {name});
+
+    if (!findProcess.waitForFinished())
+        return false;
+
+    return findProcess.exitCode() == 0;
+}
 Launcher::~Launcher() {
 }