kscreen-doctor: support setting scale of outputs

Add the option to set the scale of an output in kscreen doctor.

CHANGELOG: kscreen-doctor: support setting scale of outputs

src/doctor/doctor.cpp

@@ -245,6 +245,19 @@ void Doctor::parsePositionalArgs()
                         qApp->exit(1);
                         return;
                     }
+                } else if ((ops.count() == 4 || ops.count() == 5) && ops[2] == QStringLiteral("scale")) {
+                    // be lenient about . vs. comma as separator
+                    qreal scale = ops[3].replace(QStringLiteral(","), QStringLiteral(".")).toDouble(&ok);
+                    if (ops.count() == 5) {
+                        const auto dbl = ops[3] + QStringLiteral(".") + ops[4];
+                        scale = dbl.toDouble(&ok);
+                    };
+                    // set scale
+                    if (!ok || scale == 0 || !setScale(output_id, scale)) {
+                        qCDebug(KSCREEN_DOCTOR) << "Could not set scale " << scale << " to output " << output_id;
+                        qApp->exit(9);
+                        return;
+                    }
                 } else {
                     cerr << "Unable to parse arguments" << op << endl;
                     qApp->exit(2);
@@ -415,6 +428,24 @@ bool Doctor::setMode(int id, const QString &mode_id)
     return false;
 }
 
+bool Doctor::setScale(int id, int scale)
+{
+    if (!m_config) {
+        qCWarning(KSCREEN_DOCTOR) << "Invalid config.";
+        return false;
+    }
+
+    Q_FOREACH (const auto &output, m_config->outputs()) {
+        if (output->id() == id) {
+            output->setScale(scale);
+            m_changed = true;
+            return true;
+        }
+    }
+    cout << "Output scale " << id << " invalid." << endl;
+    return false;
+}
+
 void Doctor::applyConfig()
 {
     if (!m_changed) {

src/doctor/doctor.h

@@ -52,6 +52,7 @@ public:
     bool setEnabled(int id, bool enabled);
     bool setPosition(int id, const QPoint &pos);
     bool setMode(int id, const QString &mode_id);
+    bool setScale(int id, int scale);
 
 Q_SIGNALS:
     void outputsChanged();