Added support for duplication

src/action.rs

@@ -48,6 +48,7 @@ pub enum Action {
     Copy,
     Cut,
     Paste,
+    Duplicate,
 }
 
 /// How far should movement go?
@@ -464,6 +465,12 @@ impl RawEvent {
                 kind: KeyEventKind::Press,
                 ..
             }) => Some(Action::Paste),
+            TerminalEvent::Key(KeyEvent {
+                code: KeyCode::Char('d'),
+                modifiers: KeyModifiers::CONTROL,
+                kind: KeyEventKind::Press,
+                ..
+            }) => Some(Action::Duplicate),
             _ => None,
         }
     }

src/state.rs

@@ -768,6 +768,29 @@ impl Buffer {
         }
     }
 
+    pub fn duplicate(&mut self, cursor_id: CursorId) {
+        let Some(cursor) = self.cursors.get_mut(cursor_id) else {
+            return;
+        };
+        if let Some(s) = cursor.selection()
+            && let Some(text) = cursor.selection().and_then(|s| self.text.chars().get(s))
+        {
+            // cursor.place_at(s.end);
+            self.insert_after(cursor_id, text.to_vec())
+        } else {
+            let coord = self.text.to_coord(cursor.pos);
+            let line = self
+                .text
+                .lines()
+                .nth(coord[1].max(0) as usize)
+                .map(|l| l.to_vec());
+            if let Some(line) = line {
+                let end_of_line = self.text.to_pos([0, coord[1] + 1]);
+                self.insert(end_of_line, line);
+            }
+        }
+    }
+
     pub fn start_session(&mut self) -> CursorId {
         self.cursors.insert(Cursor::default())
     }

src/ui/input.rs

@@ -188,6 +188,11 @@ impl Input {
                     Ok(Resp::handled(Some(Event::Bell)))
                 }
             }
+            Some(Action::Duplicate) => {
+                buffer.duplicate(cursor_id);
+                self.refocus(buffer, cursor_id);
+                Ok(Resp::handled(None))
+            }
             _ => Err(event),
         }
     }