Adding SpeedUnit and TempUnit

src/speed_unit.rs

@@ -0,0 +1,30 @@
+use structopt::clap::arg_enum;
+
+arg_enum! {
+
+#[derive(Debug)]
+    pub enum SpeedUnit {
+        Kmh,
+        Ms,
+        Mph,
+        Knots
+    }
+}
+
+pub fn speed_to_unit_string(speed_unit: &SpeedUnit) -> String {
+    match speed_unit {
+        SpeedUnit::Kmh => "km/h".to_string(),
+        SpeedUnit::Ms => "m/s".to_string(),
+        SpeedUnit::Mph => "mp/h".to_string(),
+        SpeedUnit::Knots => "knots".to_string(),
+    }
+}
+
+pub fn speed_to_string(speed_unit: &SpeedUnit) -> String {
+    match speed_unit {
+        SpeedUnit::Kmh => "kmh".to_string(),
+        SpeedUnit::Ms => "ms".to_string(),
+        SpeedUnit::Mph => "mph".to_string(),
+        SpeedUnit::Knots => "kn".to_string(),
+    }
+}