Various improvements

submodules/TelegramStringFormatting/Sources/WeatherFormat.swift

@@ -0,0 +1,44 @@
+import Foundation
+
+private enum TemperatureUnit {
+    case celsius
+    case fahrenheit
+    
+    var suffix: String {
+        switch self {
+        case .celsius:
+            return "°C"
+        case .fahrenheit:
+            return "°F"
+        }
+    }
+}
+
+private var cachedTemperatureUnit: TemperatureUnit?
+private func currentTemperatureUnit() -> TemperatureUnit {
+    if let cachedTemperatureUnit {
+        return cachedTemperatureUnit
+    }
+    let temperatureFormatter = MeasurementFormatter()
+    temperatureFormatter.locale = Locale.current
+   
+    let fahrenheitMeasurement = Measurement(value: 0, unit: UnitTemperature.fahrenheit)
+    let fahrenheitString = temperatureFormatter.string(from: fahrenheitMeasurement)
+    
+    var temperatureUnit: TemperatureUnit = .celsius
+    if fahrenheitString.contains("F") || fahrenheitString.contains("Fahrenheit") {
+        temperatureUnit = .fahrenheit
+    }
+    cachedTemperatureUnit = temperatureUnit
+    return temperatureUnit
+}
+
+public func stringForTemperature(_ value: Double) -> String {
+    let formatter = MeasurementFormatter()
+    formatter.locale = Locale.current
+    formatter.unitStyle = .short
+    formatter.numberFormatter.maximumFractionDigits = 0
+    formatter.unitOptions = .temperatureWithoutUnit
+    let valueString = formatter.string(from: Measurement(value: value, unit: UnitTemperature.celsius)).trimmingCharacters(in: CharacterSet(charactersIn: "0123456789-,.").inverted)
+    return valueString + currentTemperatureUnit().suffix
+}