Minor edits

TODO.md

@@ -11,6 +11,7 @@ Roadmap for fixes and features.
  - Plural unit names
  - Releases
  - Unit substitutions
+ - mpg and gal replacement
 
 ## General
  - CLI Options: version, help, evaluate

src/quantity/unit/mod.rs

@@ -40,6 +40,7 @@ pub enum UnitBase {
 	Barn,
 	Hectare,
 	MilesPerHour,
+	MilesPerGallon,
 	Acre,
 
 
@@ -190,6 +191,7 @@ macro_rules! fromstring_db {
 
 			// Misc
 			(UnitBase::MilesPerHour, "mph"),
+			(UnitBase::MilesPerGallon, "mpg"),
 			(UnitBase::Barn, "b"),
 			(UnitBase::Barn, "barn"),
 			(UnitBase::Hectare, "ha"),
@@ -459,11 +461,17 @@ macro_rules! unit_db {
 			// Misc
 			UnitBase::MilesPerHour => $X!(
 				UnitBase::MilesPerHour, "mph",
-				rational, "1609.344",
+				float, "0.44704",
 				(UnitBase::Meter, 1f64),
 				(UnitBase::Second, -1f64)
 			),
 
+			UnitBase::MilesPerGallon => $X!(
+				UnitBase::MilesPerGallon, "mpg",
+				float, "425144",
+				(UnitBase::Meter, -2f64)
+			),
+
 			UnitBase::Barn => $X!(
 				UnitBase::Barn, "b",
 				rational, "1e-28",

src/tests.rs

@@ -175,7 +175,7 @@ fn operators() {
 }
 
 #[test]
-fn units() {
+fn basic_units() {
 	//good_expr("4 m*s", "2 m * 2s");
 	good_expr("1 s⁻¹", "1/s");
 	good_expr("6 kg", "2 * 3kg");
@@ -195,3 +195,10 @@ fn units() {
 	bad_expr("m ^ s");
 	//bad_expr("m ^ pi");
 }
+
+#[test]
+fn complex_units() {
+	good_expr("0.62137 mi", "1km to mi");
+	good_expr("3.2808 ft", "1km to ft");
+	good_expr("62.137 mph", "100 km/h to mph");
+}