Add command for keeping only the primary selection.

helix-term/src/commands.rs

@@ -1167,6 +1167,14 @@ pub fn keep_selections(cx: &mut Context) {
     cx.push_layer(Box::new(prompt));
 }
 
+pub fn keep_primary_selection(cx: &mut Context) {
+    let doc = cx.doc();
+
+    let range = doc.selection().primary();
+    let selection = Selection::single(range.anchor, range.head);
+    doc.set_selection(selection);
+}
+
 //
 
 pub fn save(cx: &mut Context) {

helix-term/src/keymap.rs

@@ -209,6 +209,9 @@ pub fn default() -> Keymaps {
         shift!('J') => commands::join_selections,
         // TODO: conflicts hover/doc
         shift!('K') => commands::keep_selections,
+        // TODO: and another method for inverse
+
+        key!(' ') => commands::keep_primary_selection,
 
         // key!('q') => commands::record_macro,
         // key!('Q') => commands::replay_macro,