From 4a07f41766e8cc8966d7166daa5e1f90c582b1fb Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Thu, 2 Feb 2023 13:16:54 -0330
Subject: swap function

---
 src/input.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/input.rs b/src/input.rs
index cc93415..ecb4b3f 100644
--- a/src/input.rs
+++ b/src/input.rs
@@ -15,6 +15,9 @@ impl Calculator {
                 KeyCode::Char('q') => {
                     return Signal::Exit;
                 }
+                KeyCode::Char('j' | 'k') => {
+                    self.swap();
+                }
                 KeyCode::Char(c) => {
                     self.push_to_buffer(c);
                 }
@@ -51,4 +54,13 @@ impl Calculator {
         self.stack.push(self.input_buffer.parse::<f64>().unwrap());
         self.input_buffer = String::new();
     }
+
+    fn swap(&mut self) {
+        if let Some(f) = self.stack.pop() {
+            if self.input_buffer.len() > 0 {
+                self.push_buffer_to_stack();
+            }
+            self.input_buffer = format!("{}", f);
+        }
+    }
 }
-- 
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