Highlight selections on vim yank (#7638)

Fixes: #7311

Co-Authored-By: WindSoilder <WindSoilder@outlook.com>

Release Notes:

- Added a highlight on yanked text in vim normal mode

**or**

- N/A

Co-authored-by: WindSoilder <WindSoilder@outlook.com>

crates/vim/src/normal/yank.rs

@@ -1,4 +1,4 @@
-use crate::{motion::Motion, object::Object, utils::copy_selections_content, Vim};
+use crate::{motion::Motion, object::Object, utils::copy_and_flash_selections_content, Vim};
 use collections::HashMap;
 use gpui::WindowContext;
 
@@ -15,7 +15,7 @@ pub fn yank_motion(vim: &mut Vim, motion: Motion, times: Option<usize>, cx: &mut
                     motion.expand_selection(map, selection, times, true, &text_layout_details);
                 });
             });
-            copy_selections_content(editor, motion.linewise(), cx);
+            copy_and_flash_selections_content(editor, motion.linewise(), cx);
             editor.change_selections(None, cx, |s| {
                 s.move_with(|_, selection| {
                     let (head, goal) = original_positions.remove(&selection.id).unwrap();
@@ -38,7 +38,7 @@ pub fn yank_object(vim: &mut Vim, object: Object, around: bool, cx: &mut WindowC
                     original_positions.insert(selection.id, original_position);
                 });
             });
-            copy_selections_content(editor, false, cx);
+            copy_and_flash_selections_content(editor, false, cx);
             editor.change_selections(None, cx, |s| {
                 s.move_with(|_, selection| {
                     let (head, goal) = original_positions.remove(&selection.id).unwrap();

crates/vim/src/utils.rs

@@ -1,12 +1,34 @@
+use std::time::Duration;
+
 use editor::{ClipboardSelection, Editor};
-use gpui::{AppContext, ClipboardItem};
+use gpui::{ClipboardItem, ViewContext};
 use language::{CharKind, Point};
 
-pub fn copy_selections_content(editor: &mut Editor, linewise: bool, cx: &mut AppContext) {
+pub struct HighlightOnYank;
+
+pub fn copy_and_flash_selections_content(
+    editor: &mut Editor,
+    linewise: bool,
+    cx: &mut ViewContext<Editor>,
+) {
+    copy_selections_content_internal(editor, linewise, true, cx);
+}
+
+pub fn copy_selections_content(editor: &mut Editor, linewise: bool, cx: &mut ViewContext<Editor>) {
+    copy_selections_content_internal(editor, linewise, false, cx);
+}
+
+fn copy_selections_content_internal(
+    editor: &mut Editor,
+    linewise: bool,
+    highlight: bool,
+    cx: &mut ViewContext<Editor>,
+) {
     let selections = editor.selections.all_adjusted(cx);
     let buffer = editor.buffer().read(cx).snapshot(cx);
     let mut text = String::new();
     let mut clipboard_selections = Vec::with_capacity(selections.len());
+    let mut ranges_to_highlight = Vec::new();
     {
         let mut is_first = true;
         for selection in selections.iter() {
@@ -32,6 +54,11 @@ pub fn copy_selections_content(editor: &mut Editor, linewise: bool, cx: &mut App
             if is_last_line {
                 start = Point::new(start.row + 1, 0);
             }
+
+            let start_anchor = buffer.anchor_after(start);
+            let end_anchor = buffer.anchor_before(end);
+            ranges_to_highlight.push(start_anchor..end_anchor);
+
             for chunk in buffer.text_for_range(start..end) {
                 text.push_str(chunk);
             }
@@ -47,6 +74,25 @@ pub fn copy_selections_content(editor: &mut Editor, linewise: bool, cx: &mut App
     }
 
     cx.write_to_clipboard(ClipboardItem::new(text).with_metadata(clipboard_selections));
+    if !highlight {
+        return;
+    }
+
+    editor.highlight_background::<HighlightOnYank>(
+        ranges_to_highlight,
+        |colors| colors.editor_document_highlight_read_background,
+        cx,
+    );
+    cx.spawn(|this, mut cx| async move {
+        cx.background_executor()
+            .timer(Duration::from_millis(200))
+            .await;
+        this.update(&mut cx, |editor, cx| {
+            editor.clear_background_highlights::<HighlightOnYank>(cx)
+        })
+        .ok();
+    })
+    .detach();
 }
 
 pub fn coerce_punctuation(kind: CharKind, treat_punctuation_as_word: bool) -> CharKind {