From 2cfbb9a0e812b0e96c7b7cd93a82c42d005e9f94 Mon Sep 17 00:00:00 2001
From: huttongrabiel <huttonthomas@icloud.com>
Date: Wed, 18 May 2022 22:34:23 -0700
Subject: [PATCH] LibGUI: Implement case inversion in Vim emulation

When in visual mode with text selected, on Key_Tilde press, uppercase
characters convert to lowercase and lowercase ones to uppercase.
---
 Userland/Libraries/LibGUI/VimEditingEngine.cpp | 7 +++++++
 Userland/Libraries/LibGUI/VimEditingEngine.h   | 3 ++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/Userland/Libraries/LibGUI/VimEditingEngine.cpp b/Userland/Libraries/LibGUI/VimEditingEngine.cpp
index c4373afdb5..03dcb31a29 100644
--- a/Userland/Libraries/LibGUI/VimEditingEngine.cpp
+++ b/Userland/Libraries/LibGUI/VimEditingEngine.cpp
@@ -1149,6 +1149,10 @@ bool VimEditingEngine::on_key_in_visual_mode(KeyEvent const& event)
             casefold_selection(Casing::Uppercase);
             switch_to_normal_mode();
             return true;
+        case (KeyCode::Key_Tilde):
+            casefold_selection(Casing::Invertcase);
+            switch_to_normal_mode();
+            return true;
         default:
             break;
         }
@@ -1428,6 +1432,9 @@ void VimEditingEngine::casefold_selection(Casing casing)
     case Casing::Lowercase:
         m_editor->insert_at_cursor_or_replace_selection(m_editor->selected_text().to_lowercase());
         return;
+    case Casing::Invertcase:
+        m_editor->insert_at_cursor_or_replace_selection(m_editor->selected_text().invert_case());
+        return;
     }
 }
 
diff --git a/Userland/Libraries/LibGUI/VimEditingEngine.h b/Userland/Libraries/LibGUI/VimEditingEngine.h
index d9e956524a..f3b372890f 100644
--- a/Userland/Libraries/LibGUI/VimEditingEngine.h
+++ b/Userland/Libraries/LibGUI/VimEditingEngine.h
@@ -162,7 +162,8 @@ private:
 
     enum class Casing {
         Uppercase,
-        Lowercase
+        Lowercase,
+        Invertcase
     };
 
     VimMode m_vim_mode { VimMode::Normal };