clean up UI.convert_displacement()

1 files changed, 5 insertions, 10 deletions

diff --git a/src/main.rs b/src/main.rs
index aabef0a..cc06d95 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -41,17 +41,12 @@ impl App {
 impl UI {
     fn convert_displacement(&mut self, unit: volume::Unit) {
         if self.displacement.len() > 0 {
-            self.displacement = format!(
-                "{}",
-                round(
-                    volume::convert(
-                        self.displacement.parse::<f64>().unwrap(),
-                        self.displacement_unit,
-                        unit,
-                    ),
-                    DECIMAL_DIGITS,
-                ),
+            let old = self.displacement.parse::<f64>().unwrap();
+            let new = round(
+                volume::convert(old, self.displacement_unit, unit),
+                DECIMAL_DIGITS,
             );
+            self.displacement = format!("{}", new);
         }
         self.displacement_unit = unit;
     }