vim: Add basic 's' support

crates/vim/src/normal.rs

@@ -45,6 +45,7 @@ actions!(
         DeleteToEndOfLine,
         Paste,
         Yank,
+        Substitute,
     ]
 );
 
@@ -56,6 +57,12 @@ pub fn init(cx: &mut AppContext) {
     cx.add_action(insert_end_of_line);
     cx.add_action(insert_line_above);
     cx.add_action(insert_line_below);
+    cx.add_action(|_: &mut Workspace, _: &Substitute, cx| {
+        Vim::update(cx, |vim, cx| {
+            let times = vim.pop_number_operator(cx);
+            substitute(vim, times, cx);
+        })
+    });
     cx.add_action(|_: &mut Workspace, _: &DeleteLeft, cx| {
         Vim::update(cx, |vim, cx| {
             let times = vim.pop_number_operator(cx);
@@ -471,6 +478,25 @@ pub(crate) fn normal_replace(text: Arc<str>, cx: &mut WindowContext) {
     });
 }
 
+pub fn substitute(vim: &mut Vim, count: usize, cx: &mut WindowContext) {
+    vim.update_active_editor(cx, |editor, cx| {
+        editor.transact(cx, |editor, cx| {
+            let selection = editor.selections.newest::<Point>(cx);
+
+            let end = if selection.start == selection.end {
+                selection.start + Point::new(0, 1)
+            } else {
+                selection.end
+            };
+
+            editor.buffer().update(cx, |buffer, cx| {
+                buffer.edit([(selection.start..end, "")], None, cx)
+            })
+        })
+    });
+    vim.switch_mode(Mode::Insert, true, cx)
+}
+
 #[cfg(test)]
 mod test {
     use gpui::TestAppContext;