move bus commands into bus struct

update the cli

internal/xair/bus.go

@@ -0,0 +1,66 @@
+package xair
+
+import "fmt"
+
+type Bus struct {
+	client Client
+}
+
+func NewBus(c Client) *Bus {
+	return &Bus{
+		client: c,
+	}
+}
+
+// Mute requests the current mute status for a bus
+func (b *Bus) Mute(bus int) (bool, error) {
+	formatter := b.client.addressMap["bus"]
+	address := fmt.Sprintf(formatter, bus) + "/mix/on"
+	err := b.client.SendMessage(address)
+	if err != nil {
+		return false, err
+	}
+
+	resp := <-b.client.respChan
+	val, ok := resp.Arguments[0].(int32)
+	if !ok {
+		return false, fmt.Errorf("unexpected argument type for bus mute value")
+	}
+	return val == 0, nil
+}
+
+// SetMute sets the mute status for a specific bus (1-based indexing)
+func (b *Bus) SetMute(bus int, muted bool) error {
+	formatter := b.client.addressMap["bus"]
+	address := fmt.Sprintf(formatter, bus) + "/mix/on"
+	var value int32
+	if !muted {
+		value = 1
+	}
+	return b.client.SendMessage(address, value)
+}
+
+// Fader requests the current fader level for a bus
+func (b *Bus) Fader(bus int) (float64, error) {
+	formatter := b.client.addressMap["bus"]
+	address := fmt.Sprintf(formatter, bus) + "/mix/fader"
+	err := b.client.SendMessage(address)
+	if err != nil {
+		return 0, err
+	}
+
+	resp := <-b.client.respChan
+	val, ok := resp.Arguments[0].(float32)
+	if !ok {
+		return 0, fmt.Errorf("unexpected argument type for bus fader value")
+	}
+
+	return mustDbFrom(float64(val)), nil
+}
+
+// SetFader sets the fader level for a specific bus (1-based indexing)
+func (b *Bus) SetFader(bus int, level float64) error {
+	formatter := b.client.addressMap["bus"]
+	address := fmt.Sprintf(formatter, bus) + "/mix/fader"
+	return b.client.SendMessage(address, float32(mustDbInto(level)))
+}