From 98ea5e172ec114004116f996f51b46cdf5c438e4 Mon Sep 17 00:00:00 2001
From: "Joseph T. Lyons" <JosephTLyons@gmail.com>
Date: Thu, 2 May 2024 08:37:13 -0400
Subject: [PATCH] Add `convert to opposite case` command (#11290)

---
 crates/editor/src/actions.rs      |  7 ++++---
 crates/editor/src/editor.rs       | 18 ++++++++++++++++++
 crates/editor/src/editor_tests.rs |  8 ++++++++
 crates/editor/src/element.rs      |  1 +
 4 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/crates/editor/src/actions.rs b/crates/editor/src/actions.rs
index 160b8a1e1b5263ce2ef15432ba535c567ead3626..143a5f4a5269d94654701272e12e54fc47d984ef 100644
--- a/crates/editor/src/actions.rs
+++ b/crates/editor/src/actions.rs
@@ -155,6 +155,7 @@ gpui::actions!(
         ConvertToKebabCase,
         ConvertToLowerCamelCase,
         ConvertToLowerCase,
+        ConvertToOppositeCase,
         ConvertToSnakeCase,
         ConvertToTitleCase,
         ConvertToUpperCamelCase,
@@ -175,8 +176,9 @@ gpui::actions!(
         DeleteToPreviousSubwordStart,
         DeleteToPreviousWordStart,
         DisplayCursorNames,
-        DuplicateLineUp,
         DuplicateLineDown,
+        DuplicateLineUp,
+        ExpandAllHunkDiffs,
         ExpandMacroRecursively,
         FindAllReferences,
         Fold,
@@ -267,7 +269,6 @@ gpui::actions!(
         ToggleGitBlame,
         ToggleGitBlameInline,
         ToggleHunkDiff,
-        ExpandAllHunkDiffs,
         ToggleInlayHints,
         ToggleLineNumbers,
         ToggleSoftWrap,
@@ -275,7 +276,7 @@ gpui::actions!(
         Undo,
         UndoSelection,
         UnfoldLines,
-        UniqueLinesCaseSensitive,
         UniqueLinesCaseInsensitive,
+        UniqueLinesCaseSensitive,
     ]
 );
diff --git a/crates/editor/src/editor.rs b/crates/editor/src/editor.rs
index 61e1d5839f8daa47cf4820d7d2e093ab017b8f7c..c9d20c27658560daebe3d0b14525e7dc43b2d98f 100644
--- a/crates/editor/src/editor.rs
+++ b/crates/editor/src/editor.rs
@@ -5192,6 +5192,24 @@ impl Editor {
         self.manipulate_text(cx, |text| text.to_case(Case::Camel))
     }
 
+    pub fn convert_to_opposite_case(
+        &mut self,
+        _: &ConvertToOppositeCase,
+        cx: &mut ViewContext<Self>,
+    ) {
+        self.manipulate_text(cx, |text| {
+            text.chars()
+                .fold(String::with_capacity(text.len()), |mut t, c| {
+                    if c.is_uppercase() {
+                        t.extend(c.to_lowercase());
+                    } else {
+                        t.extend(c.to_uppercase());
+                    }
+                    t
+                })
+        })
+    }
+
     fn manipulate_text<Fn>(&mut self, cx: &mut ViewContext<Self>, mut callback: Fn)
     where
         Fn: FnMut(&str) -> String,
diff --git a/crates/editor/src/editor_tests.rs b/crates/editor/src/editor_tests.rs
index 17f2a3c363db27eadedeb1219d3e4f6852a09794..76db71bd0b69ae8b5449f36f84c42b78eb09bee4 100644
--- a/crates/editor/src/editor_tests.rs
+++ b/crates/editor/src/editor_tests.rs
@@ -3238,6 +3238,14 @@ async fn test_manipulate_text(cx: &mut TestAppContext) {
     cx.assert_editor_state(indoc! {"
         «aaaBbbˇ» «bbbCccˇ» «cccDddˇ»
     "});
+
+    cx.set_state(indoc! {"
+        «hElLo, WoRld!ˇ»
+    "});
+    cx.update_editor(|e, cx| e.convert_to_opposite_case(&ConvertToOppositeCase, cx));
+    cx.assert_editor_state(indoc! {"
+        «HeLlO, wOrLD!ˇ»
+    "});
 }
 
 #[gpui::test]
diff --git a/crates/editor/src/element.rs b/crates/editor/src/element.rs
index eaed495c81c0685ecf8c6fcf42a2ace4e74cf48b..eda06a95c9df369eb3e1f9ea94709793c483bf12 100644
--- a/crates/editor/src/element.rs
+++ b/crates/editor/src/element.rs
@@ -176,6 +176,7 @@ impl EditorElement {
         register_action(view, cx, Editor::convert_to_kebab_case);
         register_action(view, cx, Editor::convert_to_upper_camel_case);
         register_action(view, cx, Editor::convert_to_lower_camel_case);
+        register_action(view, cx, Editor::convert_to_opposite_case);
         register_action(view, cx, Editor::delete_to_previous_word_start);
         register_action(view, cx, Editor::delete_to_previous_subword_start);
         register_action(view, cx, Editor::delete_to_next_word_end);