Implement CenterCursor vi motion

metainfo.xml

@@ -111,6 +111,7 @@
           <li>Adds `MoveTabToLeft` and `MoveTabToRight` actions to move tabs around (#1695)</li>
           <li>Adds `MoveTabTo` action to move tabs to a specific position (#1695)</li>
           <li>Ensure inserting new tabs happens right next to the currently active tab (#1695)</li>
+          <li>Adds CenterCursor (`zz`) vi motion</li>
         </ul>
       </description>
     </release>

src/vtbackend/ViCommands.cpp

@@ -1085,6 +1085,11 @@ CellLocation ViCommands::translateToCellLocationAndRecord(ViMotion motion, unsig
         case ViMotion::JumpToLastJumpPoint: return _jumpHistory.jumpToLast(cursorPosition);
         case ViMotion::JumpToMarkBackward: return _jumpHistory.jumpToMarkBackward(cursorPosition);
         case ViMotion::JumpToMarkForward: return _jumpHistory.jumpToMarkForward(cursorPosition);
+        case ViMotion::CenterCursor: {
+            _terminal->viewport().makeVisibleWithinSafeArea(unbox<LineOffset>(cursorPosition.line),
+                                                            LineCount(_terminal->pageSize().lines / 2));
+            return cursorPosition;
+        }
     }
     crispy::unreachable();
 }

src/vtbackend/ViInputHandler.cpp

@@ -69,7 +69,7 @@ void ViInputHandler::registerAllCommands()
         std::array<std::pair<char, TextObjectScope>, 2> { { std::pair { 'i', TextObjectScope::Inner },
                                                             std::pair { 'a', TextObjectScope::A } } };
 
-    auto constexpr MotionMappings = std::array<std::pair<std::string_view, ViMotion>, 47> { {
+    auto constexpr MotionMappings = std::array<std::pair<std::string_view, ViMotion>, 48> { {
         // clang-format off
         { "$", ViMotion::LineEnd },
         { "%", ViMotion::ParenthesisMatching },
@@ -118,6 +118,7 @@ void ViInputHandler::registerAllCommands()
         { "``",ViMotion::JumpToLastJumpPoint },
         { "C-O",ViMotion::JumpToMarkBackward },
         { "C-I",ViMotion::JumpToMarkForward },
+        { "zz",ViMotion::CenterCursor },
         // clang-format on
     } };
 

src/vtbackend/ViInputHandler.h

@@ -103,6 +103,7 @@ enum class ViMotion : uint8_t
     JumpToLastJumpPoint,   // '' or `` (jump to last jump)
     JumpToMarkBackward,    // <C-O>
     JumpToMarkForward,     // <C-I>
+    CenterCursor,          // zz
 };
 
 enum class ViOperator : uint8_t
@@ -383,6 +384,7 @@ struct std::formatter<vtbackend::ViMotion>: formatter<std::string_view>
             case ViMotion::GlobalCurlyOpenDown: name = "GlobalCurlyOpenDown"; break;
             case ViMotion::LineMarkUp: name = "LineMarkUp"; break;
             case ViMotion::LineMarkDown: name = "LineMarkDown"; break;
+            case ViMotion::CenterCursor: name = "CenterCursor"; break;
         }
         return formatter<string_view>::format(name, ctx);
     }