Add parser

parse.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"fmt"
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+var reg = regexp.MustCompile("t=\\d+")
+
+func ParseTemp() {
+
+}
+
+func parse(w1Out string) float64 {
+	t := reg.FindString(w1Out)
+	if t == "" {
+		return 0
+	}
+
+	temp := strings.TrimLeft(t, "t=")
+
+	f, err := strconv.ParseFloat(temp, 64)
+	if err != nil {
+		fmt.Printf("error parsing temperature %s: %s\n", temp, err)
+		return 0
+	}
+
+	return f / 1000
+}

parse_test.go

@@ -0,0 +1,24 @@
+package main
+
+import "testing"
+
+func TestParse(t *testing.T) {
+	t.Run("should find temperature", func(t *testing.T) {
+		const out = `5b 01 4b 46 7f ff 0c 10 07 : crc=07 YES
+5b 01 4b 46 7f ff 0c 10 07 t=21687`
+		temp := parse(out)
+		if temp != 21.687 {
+			t.Errorf("temp is not 21.687, is %f", temp)
+			t.Fail()
+		}
+	})
+	t.Run("should not find temperature", func(t *testing.T) {
+		const out = `5b 01 4b 46 7f ff 0c 10 07 : crc=07 YES
+5b 01 4b 46 7f ff 0c 10 07`
+		temp := parse(out)
+		if temp != 0 {
+			t.Errorf("temp is not 0, is %f", temp)
+			t.Fail()
+		}
+	})
+}