Added KtsToBft helper function

helpers.go

@@ -0,0 +1,53 @@
+package metar
+
+// InHgTohPa converts "inch of mercury" to "hectopascal"
+func InHgTohPa(inHg float64) float64 {
+	return inHg * 33.8638866667
+}
+
+// KtsToMs converts "knots" to "meters per second"
+func KtsToMs(kts float64) float64 {
+	return kts * 0.514444
+}
+
+// KtsToBft converts "knots" to "bft"
+func KtsToBft(kts float64) int {
+	switch {
+	case kts < 1:
+		return 0
+	case kts < 4:
+		return 1
+	case kts < 7:
+		return 2
+	case kts < 11:
+		return 3
+	case kts < 16:
+		return 4
+	case kts < 22:
+		return 5
+	case kts < 28:
+		return 6
+	case kts < 34:
+		return 7
+	case kts < 41:
+		return 8
+	case kts < 48:
+		return 9
+	case kts < 56:
+		return 10
+	case kts < 64:
+		return 11
+	default:
+		return 12
+	}
+}
+
+// StatMileToKm converts "statute miles" to "kilometers"
+func StatMileToKm(sm float64) float64 {
+	return sm * 1.60934
+}
+
+// MbTohPa converts "millibar" to "hectopascal"
+func MbTohPa(mb float64) float64 {
+	return mb * 0.1
+}

helpers_test.go

@@ -0,0 +1,20 @@
+package metar_test
+
+import (
+	. "github.com/Luzifer/go-metar"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("Helpers", func() {
+
+	It("should convert values into expected results", func() {
+		Expect(KtsToMs(1)).To(Equal(0.514444))
+		Expect(InHgTohPa(1)).To(Equal(33.8638866667))
+		Expect(StatMileToKm(1)).To(Equal(1.60934))
+		Expect(MbTohPa(1)).To(Equal(0.1))
+		Expect(KtsToBft(5)).To(Equal(2))
+	})
+
+})

metar.go

@@ -107,23 +107,3 @@ func FetchCurrentStationWeather(station string) (*Result, error) {
 
 	return &r.Data.Results[0], nil
 }
-
-// InHgTohPa converts "inch of mercury" to "hectopascal"
-func InHgTohPa(inHg float64) float64 {
-	return inHg * 33.8638866667
-}
-
-// KtsToMs converts "knots" to "meters per second"
-func KtsToMs(kts float64) float64 {
-	return kts * 0.514444
-}
-
-// StatMileToKm converts "statute miles" to "kilometers"
-func StatMileToKm(sm float64) float64 {
-	return sm * 1.60934
-}
-
-// MbTohPa converts "millibar" to "hectopascal"
-func MbTohPa(mb float64) float64 {
-	return mb * 0.1
-}