Add reset button and console commands for clearing output/history

src/qt/forms/debugwindow.ui

@@ -570,6 +570,32 @@
            </property>
           </widget>
          </item>
+         <item>
+          <widget class="QToolButton" name="resetButton">
+           <property name="toolTip">
+            <string>Clear console output and history.</string>
+           </property>
+           <property name="layoutDirection">
+            <enum>Qt::LeftToRight</enum>
+           </property>
+           <property name="text">
+            <string/>
+           </property>
+           <property name="icon">
+            <iconset resource="../bitcoin.qrc">
+             <normaloff>:/icons/transaction_abandoned</normaloff>:/icons/transaction_abandoned</iconset>
+           </property>
+           <property name="iconSize">
+            <size>
+             <width>22</width>
+             <height>22</height>
+            </size>
+           </property>
+           <property name="shortcut">
+            <string notr="true">Ctrl+Shift+L</string>
+           </property>
+          </widget>
+         </item>
         </layout>
        </item>
        <item>

src/qt/rpcconsole.cpp

@@ -93,6 +93,9 @@ public Q_SLOTS:
 
 Q_SIGNALS:
     void reply(int category, const QString &command);
+    void clearScreen();
+    void clearHistory();
+    void printHistory();
 
 private:
     interfaces::Node& m_node;
@@ -402,7 +405,21 @@ void RPCExecutor::request(const QString &command, const QString& wallet_name)
                 "   example:    getblock(getblockhash(0) 1)[tx]\n\n"
 
                 "Results without keys can be queried with an integer in brackets using the parenthesized syntax.\n"
-                "   example:    getblock(getblockhash(0),1)[tx][0]\n\n")));
+                "   example:    getblock(getblockhash(0),1)[tx][0]\n\n"
+                "Console commands:\n"
+                "   clear               Clears the screen.\n"
+                "   history-clear       Clears the command history and the screen.\n"
+                "   history             Prints all command history.\n\n"
+            )));
+            return;
+        } else if (executableCommand == "clear\n") {
+            Q_EMIT clearScreen();
+            return;
+        } else if (executableCommand == "history-clear\n") {
+            Q_EMIT clearHistory();
+            return;
+        } else if (executableCommand == "history\n") {
+            Q_EMIT printHistory();
             return;
         }
         if (!RPCConsole::RPCExecuteCommandLine(m_node, result, executableCommand, nullptr, wallet_name)) {
@@ -506,6 +523,7 @@ RPCConsole::RPCConsole(interfaces::Node& node, const PlatformStyle *_platformSty
         ui->openDebugLogfileButton->setIcon(platformStyle->SingleColorIcon(":/icons/export"));
     }
     ui->clearButton->setIcon(platformStyle->SingleColorIcon(":/icons/remove"));
+    ui->resetButton->setIcon(platformStyle->SingleColorIcon(":/icons/transaction_abandoned")); // Trash icon
 
     ui->fontBiggerButton->setIcon(platformStyle->SingleColorIcon(":/icons/fontbigger"));
     //: Main shortcut to increase the RPC console font size.
@@ -527,7 +545,11 @@ RPCConsole::RPCConsole(interfaces::Node& node, const PlatformStyle *_platformSty
     ui->messagesWidget->installEventFilter(this);
 
     connect(ui->hidePeersDetailButton, &QAbstractButton::clicked, this, &RPCConsole::clearSelectedNode);
-    connect(ui->clearButton, &QAbstractButton::clicked, [this] { clear(); });
+    connect(ui->clearButton, &QAbstractButton::clicked, [this]() { clear(); });
+    connect(ui->resetButton, &QAbstractButton::clicked, [this]() { 
+        history.clear();
+        clear(false);
+    });
     connect(ui->fontBiggerButton, &QAbstractButton::clicked, this, &RPCConsole::fontBigger);
     connect(ui->fontSmallerButton, &QAbstractButton::clicked, this, &RPCConsole::fontSmaller);
     connect(ui->btnClearTrafficGraph, &QPushButton::clicked, ui->trafficGraph, &TrafficGraphWidget::clear);
@@ -728,6 +750,9 @@ void RPCConsole::setClientModel(ClientModel *model, int bestblock_height, int64_
         }
 
         wordList << "help-console";
+        wordList << "clear";
+        wordList << "history-clear";
+        wordList << "history";
         wordList.sort();
         autoCompleter = new QCompleter(wordList, this);
         autoCompleter->setModelSorting(QCompleter::CaseSensitivelySortedModel);
@@ -863,6 +888,7 @@ void RPCConsole::clear(bool keep_prompt)
             they are not space separated from the rest of the text intentionally. */
         tr("Welcome to the %1 RPC console.\n"
            "Use up and down arrows to navigate history, and %2 to clear screen.\n"
+           "Use %9 to reset the console, clearing both the screen and command history.\n"
            "Use %3 and %4 to increase or decrease the font size.\n"
            "Type %5 for an overview of available commands.\n"
            "For more information on using this console, type %6.\n"
@@ -877,7 +903,8 @@ void RPCConsole::clear(bool keep_prompt)
                  "<b>help</b>",
                  "<b>help-console</b>",
                  "<span class=\"secwarning\">",
-                 "<span>");
+                 "<span>",
+                 "<b>" + ui->resetButton->shortcut().toString(QKeySequence::NativeText) + "</b>");
 
     message(CMD_REPLY, welcome_message, true);
 }
@@ -1077,18 +1104,43 @@ void RPCConsole::browseHistory(int offset)
     ui->lineEdit->setText(cmd);
 }
 
+void RPCConsole::finishCommand(const std::function<void()>& action)
+{
+    // Remove "Executing…" message.
+    ui->messagesWidget->undo();
+    action();
+    scrollToEnd();
+    m_is_executing = false;
+}
+
 void RPCConsole::startExecutor()
 {
     m_executor = new RPCExecutor(m_node);
     m_executor->moveToThread(&thread);
 
     // Replies from executor object must go to this object
     connect(m_executor, &RPCExecutor::reply, this, [this](int category, const QString& command) {
-        // Remove "Executing…" message.
-        ui->messagesWidget->undo();
-        message(category, command);
-        scrollToEnd();
-        m_is_executing = false;
+        finishCommand([this, category, command]() { message(category, command); });
+    });
+    connect(m_executor, &RPCExecutor::clearScreen, this, [this]() {
+        finishCommand([this]() { clear(false); });
+    });
+    connect(m_executor, &RPCExecutor::clearHistory, this, [this]() {
+        finishCommand([this]() {
+            history.clear();
+            message(CMD_REPLY, tr("History has been cleared."));
+        });
+    });
+    connect(m_executor, &RPCExecutor::printHistory, this, [this]() {
+        finishCommand([this]() {
+            QStringList out;
+            out.reserve(history.size());
+            qsizetype index = 0;
+            for (const QString& entry : history) {
+                out << QStringLiteral("%1: %2").arg(++index).arg(entry);
+            }
+            message(CMD_REPLY, out.join(QStringLiteral("\n")));
+        });
     });
 
     // Make sure executor object is deleted in its own thread

src/qt/rpcconsole.h

@@ -104,6 +104,7 @@ private Q_SLOTS:
     void clearSelectedNode();
     /** show detailed information on ui about selected node */
     void updateDetailWidget();
+    void finishCommand(const std::function<void()>& action);
 
 public Q_SLOTS:
     void clear(bool keep_prompt = false);