Add dbus method for setting and querying history size per session

FEATURE: 120040
FIXED-IN: 4.9

src/Session.cpp

@@ -1275,6 +1275,34 @@ QString Session::tabTitleFormat(int context) const
     }
 }
 
+void Session::setHistorySize(int lines)
+{
+    if ( lines < 0 ) {
+        setHistoryType(HistoryTypeFile());
+    }
+    else if ( lines == 0 ) {
+        setHistoryType(HistoryTypeNone());
+    }
+    else {
+        setHistoryType(CompactHistoryType(lines));
+    }
+}
+
+int Session::historySize() const
+{
+    const HistoryType& currentHistory = historyType();
+
+    if (currentHistory.isEnabled()) {
+        if (currentHistory.isUnlimited()) {
+            return -1;
+        } else {
+            return currentHistory.maximumLineCount();
+        }
+    } else {
+        return 0;
+    }
+}
+
 int Session::foregroundProcessId()
 {
     int pid;

src/Session.h

@@ -522,6 +522,23 @@ public slots:
      */
     Q_SCRIPTABLE QString tabTitleFormat(int context) const;
 
+    /**
+     * Sets the history capacity of this session.
+     *
+     * @param size The history capacity in unit of lines. Its value can be:
+     * <ul>
+     * <li> positive integer  -  fixed size history</li>
+     * <li> 0 -  no history</li>
+     * <li> negative integer -  unlimited history</li>
+     * </ul>
+     */
+    Q_SCRIPTABLE void setHistorySize(int lines) ;
+
+    /**
+     * Returns the history capacity of this session.
+     */
+    Q_SCRIPTABLE int historySize() const;
+
 signals:
 
     /** Emitted when the terminal process starts. */