Add a splitPane option to duplicate current profile (#4683)

This change adds the ability to configure a pane to split by duplicating the current profile 

Closes #1756

Author: surya-prakash-susarla

src/cascadia/TerminalApp/ActionArgs.h

@@ -331,13 +331,26 @@ namespace winrt::TerminalApp::implementation
         return TerminalApp::SplitState::None;
     };
 
+    // Possible SplitType values
+    static constexpr std::string_view DuplicateKey{ "duplicate" };
+    static TerminalApp::SplitType ParseSplitModeState(const std::string& stateString)
+    {
+        if (stateString == DuplicateKey)
+        {
+            return TerminalApp::SplitType::Duplicate;
+        }
+        return TerminalApp::SplitType::Manual;
+    }
+
     struct SplitPaneArgs : public SplitPaneArgsT<SplitPaneArgs>
     {
         SplitPaneArgs() = default;
         GETSET_PROPERTY(winrt::TerminalApp::SplitState, SplitStyle, winrt::TerminalApp::SplitState::None);
         GETSET_PROPERTY(winrt::TerminalApp::NewTerminalArgs, TerminalArgs, nullptr);
+        GETSET_PROPERTY(winrt::TerminalApp::SplitType, SplitMode, winrt::TerminalApp::SplitType::Manual);
 
         static constexpr std::string_view SplitKey{ "split" };
+        static constexpr std::string_view SplitModeKey{ "splitMode" };
 
     public:
         bool Equals(const IActionArgs& other)
@@ -346,7 +359,8 @@ namespace winrt::TerminalApp::implementation
             if (otherAsUs)
             {
                 return otherAsUs->_SplitStyle == _SplitStyle &&
-                       otherAsUs->_TerminalArgs == _TerminalArgs;
+                       otherAsUs->_TerminalArgs == _TerminalArgs &&
+                       otherAsUs->_SplitMode == _SplitMode;
             }
             return false;
         };
@@ -359,6 +373,10 @@ namespace winrt::TerminalApp::implementation
             {
                 args->_SplitStyle = ParseSplitState(jsonStyle.asString());
             }
+            if (auto jsonStyle{ json[JsonKey(SplitModeKey)] })
+            {
+                args->_SplitMode = ParseSplitModeState(jsonStyle.asString());
+            }
             return { *args, {} };
         }
     };

src/cascadia/TerminalApp/ActionArgs.idl

@@ -31,6 +31,12 @@ namespace TerminalApp
         Horizontal = 2
     };
 
+    enum SplitType
+    {
+        Manual = 0,
+        Duplicate = 1
+    };
+
     [default_interface] runtimeclass NewTerminalArgs {
         NewTerminalArgs();
         String Commandline;
@@ -82,5 +88,6 @@ namespace TerminalApp
     {
         SplitState SplitStyle { get; };
         NewTerminalArgs TerminalArgs { get; };
+        SplitType SplitMode { get; };
     };
 }

src/cascadia/TerminalApp/AppActionHandlers.cpp

@@ -98,7 +98,7 @@ namespace winrt::TerminalApp::implementation
         }
         else if (const auto& realArgs = args.ActionArgs().try_as<TerminalApp::SplitPaneArgs>())
         {
-            _SplitPane(realArgs.SplitStyle(), realArgs.TerminalArgs());
+            _SplitPane(realArgs.SplitStyle(), realArgs.SplitMode(), realArgs.TerminalArgs());
             args.Handled(true);
         }
     }

src/cascadia/TerminalApp/TerminalPage.cpp

@@ -1045,10 +1045,12 @@ namespace winrt::TerminalApp::implementation
     // Arguments:
     // - splitType: one value from the TerminalApp::SplitState enum, indicating how the
     //   new pane should be split from its parent.
+    // - splitMode: value from TerminalApp::SplitType enum, indicating the profile to be used in the newly split pane.
     // - newTerminalArgs: An object that may contain a blob of parameters to
     //   control which profile is created and with possible other
     //   configurations. See CascadiaSettings::BuildSettings for more details.
     void TerminalPage::_SplitPane(const TerminalApp::SplitState splitType,
+                                  const TerminalApp::SplitType splitMode,
                                   const winrt::TerminalApp::NewTerminalArgs& newTerminalArgs)
     {
         // Do nothing if we're requesting no split.
@@ -1067,7 +1069,24 @@ namespace winrt::TerminalApp::implementation
 
         auto focusedTab = _GetStrongTabImpl(*indexOpt);
 
-        const auto [realGuid, controlSettings] = _settings->BuildSettings(newTerminalArgs);
+        winrt::Microsoft::Terminal::Settings::TerminalSettings controlSettings;
+        GUID realGuid;
+        bool profileFound = false;
+
+        if (splitMode == TerminalApp::SplitType::Duplicate)
+        {
+            std::optional<GUID> current_guid = focusedTab->GetFocusedProfile();
+            if (current_guid)
+            {
+                profileFound = true;
+                controlSettings = _settings->BuildSettings(current_guid.value());
+                realGuid = current_guid.value();
+            }
+        }
+        if (!profileFound)
+        {
+            std::tie(realGuid, controlSettings) = _settings->BuildSettings(newTerminalArgs);
+        }
 
         const auto controlConnection = _CreateConnectionFromSettings(realGuid, controlSettings);
 

src/cascadia/TerminalApp/TerminalPage.h

@@ -122,7 +122,7 @@ namespace winrt::TerminalApp::implementation
         // Todo: add more event implementations here
         // MSFT:20641986: Add keybindings for New Window
         void _Scroll(int delta);
-        void _SplitPane(const winrt::TerminalApp::SplitState splitType, const winrt::TerminalApp::NewTerminalArgs& newTerminalArgs = nullptr);
+        void _SplitPane(const winrt::TerminalApp::SplitState splitType, const winrt::TerminalApp::SplitType splitMode = winrt::TerminalApp::SplitType::Manual, const winrt::TerminalApp::NewTerminalArgs& newTerminalArgs = nullptr);
         void _ResizePane(const Direction& direction);
         void _ScrollPage(int delta);
         void _SetAcceleratorForMenuItem(Windows::UI::Xaml::Controls::MenuFlyoutItem& menuItem, const winrt::Microsoft::Terminal::Settings::KeyChord& keyChord);