Add module src/free_api_v25/query/units.rs

src/free_api_v25/query/mod.rs

@@ -18,4 +18,5 @@
 //! assert!(url.contains("q=London"));
 //! ```
 
+pub mod units;
 pub mod urls;

src/free_api_v25/query/units.rs

@@ -0,0 +1,31 @@
+use std::fmt;
+
+/// Units of measurement for temperature and wind speed.
+///
+/// - **Standard**: Kelvin (temperature), m/s (wind)  
+/// - **Metric**: Celsius, m/s  
+/// - **Imperial**: Fahrenheit, miles/hour
+///
+/// See: <https://openweathermap.org/current#data>
+///
+/// # Example
+/// ```
+/// use owm_api25::query::Units;
+/// assert_eq!(Units::Metric.to_string(), "metric");
+/// ```
+#[derive(Debug, Clone, Copy)]
+pub enum Units {
+    Standard,
+    Metric,
+    Imperial,
+}
+
+impl fmt::Display for Units {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Units::Standard => write!(f, "standard"),
+            Units::Metric => write!(f, "metric"),
+            Units::Imperial => write!(f, "imperial"),
+        }
+    }
+}