fix: cli temperature read

changes:
- fix: read temperature values without daemon
  Add subcommand to read temperature values without starting the daemon

- fix: implement measured value types
  Replace measured value types with constants

- fix: add sensor pipelines
  Add functions which returns a channel with measured values

- fix: filter measured values from a channel
  Add functions to filter measured values by sensor id or measured
  value types.

pkg/cli/cli.go

@@ -8,6 +8,25 @@ import (
 	"git.cryptic.systems/volker.raschek/flucky/pkg/types"
 )
 
+func PrintMeasuredValues(measuredValues []*types.MeasuredValue, w io.Writer) error {
+
+	// declar tabwriter
+	tw := tabwriter.NewWriter(w, 0, 0, 3, ' ', 0)
+
+	fmt.Fprint(tw, "timestamp\ttype\tvalue\n")
+
+	for i := range measuredValues {
+		fmt.Fprintf(tw, "%v\t%v\t%v\n", measuredValues[i].Date.String(), measuredValues[i].ValueType, measuredValues[i].Value)
+	}
+
+	err := tw.Flush()
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
 // PrintSensors displays a list with all configured sensors
 func PrintSensors(sensors []*types.Sensor, w io.Writer) error {
 
@@ -42,7 +61,10 @@ func PrintSensors(sensors []*types.Sensor, w io.Writer) error {
 		fmt.Fprintf(tw, "%v\t%v\n", sensor.TickDuration, sensor.Enabled)
 	}
 
-	tw.Flush()
+	err := tw.Flush()
+	if err != nil {
+		return err
+	}
 
 	return nil
 }