Add alignment to header

src/calc.rs

@@ -383,9 +383,10 @@ impl Calculator {
 
     pub fn get_status_line(&self) -> String {
         format!(
-            "[{}] [{}] [{}]",
+            "[{}] [{}] [{}] [{}]",
             self.display_mode,
             self.angle_mode,
+            self.calculator_alignment,
             if self.save_on_close { "W" } else { "w" }
         )
     }

src/calc/constants.rs

@@ -107,3 +107,12 @@ impl Default for CalculatorAlignment {
         CalculatorAlignment::Left
     }
 }
+
+impl fmt::Display for CalculatorAlignment {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match self {
+            CalculatorAlignment::Left => write!(f, "L"),
+            CalculatorAlignment::Right => write!(f, "R"),
+        }
+    }
+}