Add support for imperial quarts

src/conversions.rs

@@ -105,6 +105,11 @@ fn get_conversion(unit: NonMetric) -> Conversion {
 			from: imperial_gallon_from,
 			to: MetricQuantity { amount: imperial_gallon_to, unit: Metric::Litre },
 		},
+		NonMetric::ImperialQuart => Conversion {
+			offset: 0.0,
+			from: 4.0 * imperial_gallon_from,
+			to: MetricQuantity { amount: imperial_gallon_to, unit: Metric::Litre },
+		},
 	}
 }
 
@@ -177,6 +182,7 @@ mod test {
 	fn fluid_volume() {
 		let tests = [
 			Test(NonMetric::ImperialGallon, 4.54609),
+			Test(NonMetric::ImperialQuart, 1.1365225),
 		];
 		run_tests(&tests, Metric::Litre);
 	}

src/lib.rs

@@ -86,6 +86,7 @@ fn unit_to_name(unit: NonMetric) -> &'static str {
 		NonMetric::CubicFoot => "cubic feet",
 		// Fluid volume
 		NonMetric::ImperialGallon => "imperial gallons",
+		NonMetric::ImperialQuart => "imperial quarts",
 	}
 }
 
@@ -129,5 +130,6 @@ mod test {
 		assert_eq!(run("1 ft³"), Ok("28 317 cm³".to_string()));
 		// Fluid volume
 		assert_eq!(run("1 imp gal"), Ok("4.546 l".to_string()));
+		assert_eq!(run("1 imp qt"), Ok("1.137 l".to_string()));
 	}
 }

src/parse.rs

@@ -190,6 +190,10 @@ fn parse_unit(input: String) -> Result<NonMetric, ParseError> {
 		"imperial gallons" => Ok(NonMetric::ImperialGallon),
 		"imp gal" => Ok(NonMetric::ImperialGallon),
 
+		"imperial quart" => Ok(NonMetric::ImperialQuart),
+		"imperial quarts" => Ok(NonMetric::ImperialQuart),
+		"imp qt" => Ok(NonMetric::ImperialQuart),
+
 		_ => Err(ParseError::UnknownUnit(input)),
 	}
 }
@@ -429,6 +433,10 @@ mod test {
 		assert_eq!(parse_unit("imperial gallons".to_string()), Ok(NonMetric::ImperialGallon));
 		assert_eq!(parse_unit("imp gal".to_string()), Ok(NonMetric::ImperialGallon));
 
+		assert_eq!(parse_unit("imperial quart".to_string()), Ok(NonMetric::ImperialQuart));
+		assert_eq!(parse_unit("imperial quarts".to_string()), Ok(NonMetric::ImperialQuart));
+		assert_eq!(parse_unit("imp qt".to_string()), Ok(NonMetric::ImperialQuart));
+
 		// Unknown unit
 		assert_eq!(parse_unit("hutenosa".to_string()), Err(ParseError::UnknownUnit("hutenosa".to_string())));
 	}

src/units.rs

@@ -31,6 +31,7 @@ pub enum NonMetric {
 	CubicFoot,
 	// Fluid volume
 	ImperialGallon,
+	ImperialQuart,
 }
 
 #[derive(Clone, Copy, Debug, PartialEq)]