Implement quick edit

imports/NeoChat/Component/ChatBox/ChatBar.qml

@@ -339,6 +339,7 @@ ToolBar {
 
     function postMessage() {
         checkForFancyEffectsReason();
+
         if (ChatBoxHelper.hasAttachment) {
             // send attachment but don't reset the text
             actionsHandler.postMessage("", ChatBoxHelper.attachmentPath,
@@ -347,8 +348,16 @@ ToolBar {
             messageSent();
             return;
         }
-        actionsHandler.postMessage(inputField.text.trim(), ChatBoxHelper.attachmentPath,
-            ChatBoxHelper.replyEventId, ChatBoxHelper.editEventId, userAutocompleted);
+
+        const re = /^s\/([^\/]*)\/([^\/]*)/;
+        if (Config.allowQuickEdit && re.test(inputField.text)) {
+            // send edited messages
+            actionsHandler.postEdit(inputField.text);
+        } else {
+            // send normal message
+            actionsHandler.postMessage(inputField.text.trim(), ChatBoxHelper.attachmentPath,
+                ChatBoxHelper.replyEventId, ChatBoxHelper.editEventId, userAutocompleted);
+        }
         currentRoom.markAllMessagesAsRead();
         inputField.clear();
         inputField.text = Qt.binding(function() {

imports/NeoChat/Page/SettingsPage.qml

@@ -76,5 +76,13 @@ Kirigami.ScrollablePage {
                 Config.save()
             }
         }
+        QQC2.CheckBox {
+            text: i18n("Use s/text/replacement syntax to edit your last message")
+            checked: Config.allowQuickEdit
+            onToggled: {
+                Config.allowQuickEdit = checked
+                Config.save()
+            }
+        }
     }
 }

src/actionshandler.cpp

@@ -2,8 +2,10 @@
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 #include "actionshandler.h"
+#include "controller.h"
 
-#include "csapi/joining.h"
+#include <csapi/joining.h>
+#include <events/roommessageevent.h>
 
 #include <KLocalizedString>
 #include <QDebug>
@@ -56,6 +58,36 @@ void ActionsHandler::setConnection(Connection *connection)
     Q_EMIT connectionChanged();
 }
 
+void ActionsHandler::postEdit(const QString &text)
+{
+
+    const auto localId = Controller::instance().activeConnection()->userId();
+    for (auto it = m_room->messageEvents().crbegin(); it != m_room->messageEvents().crend(); ++it) {
+        const auto &evt = **it;
+        if (const auto event = eventCast<const RoomMessageEvent>(&evt)) {
+            if (event->senderId() == localId && event->hasTextContent()) {
+                static QRegularExpression re("^s/([^/]*)/([^/]*)");
+                auto match = re.match(text);
+                if (!match.hasMatch()) {
+                    // should not happen but still make sure to send the message normally
+                    // just in case.
+                    postMessage(text, QString(), QString(), QString(), QVariantMap());
+                }
+                const QString regex = match.captured(1);
+                const QString replacement = match.captured(2);
+                QString originalString;
+                if (event->content()) {
+                    originalString = static_cast<const Quotient::EventContent::TextContent *>(event->content())->body;
+                } else {
+                    originalString = event->plainBody();
+                }
+                m_room->postHtmlMessage(text, originalString.replace(regex, replacement), event->msgtype(), "", event->id());
+                return;
+            }
+        }
+    }
+}
+
 void ActionsHandler::postMessage(const QString &text,
                                  const QString &attachementPath,
                                  const QString &replyEventId,

src/actionshandler.h

@@ -58,6 +58,12 @@ public Q_SLOTS:
     void
     postMessage(const QString &text, const QString &attachementPath, const QString &replyEventId, const QString &editEventId, const QVariantMap &usernames);
 
+    /// \brief Send edit instructions (.e.g s/hallo/hello/)
+    ///
+    /// This will automatically edit the last message posted and send the sed
+    /// instruction to IRC.
+    void postEdit(const QString &text);
+
 private:
     Connection *m_connection = nullptr;
     NeoChatRoom *m_room = nullptr;

src/neochatconfig.kcfg

@@ -30,6 +30,10 @@
       <label>Show leave and join events in the timeline</label>
       <default>true</default>
     </entry>
+    <entry name="AllowQuickEdit" type="bool">
+      <label>Use s/text/replacement syntax to edit your last message.</label>
+      <default>false</default>
+    </entry>
   </group>
   <group name="Timeline">
     <entry name="ShowAvatarInTimeline" type="bool">