simplify the driver interface

app/proc/drivers/rapl.go

@@ -20,14 +20,32 @@ type RaplDriver struct {
 	energyState map[string]EnergyState
 }
 
-func NewRaplDriver() *RaplDriver {
-	return &RaplDriver{
+func NewRaplDriver() (*RaplDriver, error) {
+	r := RaplDriver{
 		energyState: map[string]EnergyState{},
 	}
-
+	_, err := r.Read()
+	return &r, err
 }
 
-func (r *RaplDriver) ReadPowerSensors() ([]PowerSensor, error) {
+func (r *RaplDriver) Render(console *strings.Builder) error {
+	fmt.Fprint(console, "--- Power ---\n")
+	p, err := r.Read()
+	if err != nil {
+		return err
+	}
+
+	power := p.([]PowerSensor)
+
+	for _, sensor := range power {
+		// \033[K clears from cursor to end of line (prevents lingering chars)
+		fmt.Fprintf(console, "%-16s | %.2f W\033[K\n", sensor.Name, sensor.Watts)
+	}
+
+	return nil
+}
+
+func (r *RaplDriver) Read() (any, error) {
 	powerSensors := []PowerSensor{}
 
 	patterns := []string{