Implement view swapping

* add Tree::swap_split_in_direction()
* add swap_view_{left,down,up,right} commands, bound to H,J,K,L
  respectively in the Window menu(s)
* add test for view swapping

1 files changed, 16 insertions, 0 deletions

diff --git a/helix-view/src/editor.rs b/helix-view/src/editor.rs
index 1ad21059..3ba6fea8 100644
--- a/helix-view/src/editor.rs
+++ b/helix-view/src/editor.rs
@@ -885,6 +885,22 @@ impl Editor {
         self.tree.focus_direction(tree::Direction::Down);
     }
 
+    pub fn swap_right(&mut self) {
+        self.tree.swap_split_in_direction(tree::Direction::Right);
+    }
+
+    pub fn swap_left(&mut self) {
+        self.tree.swap_split_in_direction(tree::Direction::Left);
+    }
+
+    pub fn swap_up(&mut self) {
+        self.tree.swap_split_in_direction(tree::Direction::Up);
+    }
+
+    pub fn swap_down(&mut self) {
+        self.tree.swap_split_in_direction(tree::Direction::Down);
+    }
+
     pub fn transpose_view(&mut self) {
         self.tree.transpose();
     }