make v2 the migration version to codeberg (#2)

event.go

@@ -0,0 +1,183 @@
+package swayipc
+
+import (
+	"encoding/json"
+	"fmt"
+)
+
+// Event types.
+const (
+	EV_Workspace       int = 0x80000000
+	EV_Output          int = 0x80000001
+	EV_Mode            int = 0x80000002
+	EV_Window          int = 0x80000003
+	EV_BarconfigUpdate int = 0x80000004
+	EV_Binding         int = 0x80000005
+	EV_Shutdown        int = 0x80000006
+	EV_Tick            int = 0x80000007
+	EV_BarStateUpdate  int = 0x80000014
+	EV_Input           int = 0x80000015
+)
+
+// Subscriber struct, use this to tell  swayipc which events you want to
+// subscribe.
+type Event struct {
+	Workspace       bool
+	Output          bool
+	Mode            bool
+	Window          bool
+	BarconfigUpdate bool
+	Binding         bool
+	Shutdown        bool
+	Tick            bool
+	BarStateUpdate  bool
+	Input           bool
+}
+
+// Workspace event response
+type EventWorkspace struct {
+	Change  string `json:"change"`
+	Current *Node  `json:"workspace"`
+	Old     *Node  `json:"old"`
+}
+
+// Output event response
+type EventOutput struct {
+	Change string `json:"change"`
+}
+
+// Mode event response
+type EventMode struct {
+	Change      string `json:"change"`
+	PangoMarkup *Node  `json:"pango_markup"`
+}
+
+// Window event response
+type EventWindow struct {
+	Change    string `json:"change"`
+	Container *Node  `json:"container"`
+}
+
+// BarConfig event response
+type EventBarConfig struct {
+	Change  string   `json:"change"`
+	Binding *Binding `json:"binding"`
+}
+
+// Shutdown event response
+type EventShutdown struct {
+	Change string `json:"change"`
+}
+
+// Tick event response
+type EventTick struct {
+	First   bool   `json:"first"`
+	Payload string `json:"payload"`
+}
+
+// BarState event response
+type EventBarState struct {
+	Id                string `json:"id"`
+	VisibleByModifier bool   `json:"visible_by_modifier"`
+}
+
+// Input event response
+type EventInput struct {
+	Change string `json:"change"`
+	Input  *Input `json:"input"`
+}
+
+// Subscribe  to  one or  more  events.  Fill the  swayipc.Event  object
+// accordingly.
+//
+// Returns a response list containing  a response for every subscribed
+// event.
+func (ipc *SwayIPC) Subscribe(sub *Event) ([]*Response, error) {
+	events := []string{}
+
+	// looks ugly but makes it much more comfortable for the user
+	if sub.Workspace {
+		events = append(events, "workspace")
+	}
+	if sub.Output {
+		events = append(events, "output")
+	}
+	if sub.Mode {
+		events = append(events, "mode")
+	}
+	if sub.Window {
+		events = append(events, "window")
+	}
+	if sub.BarconfigUpdate {
+		events = append(events, "barconfig_update")
+	}
+	if sub.Binding {
+		events = append(events, "binding")
+	}
+	if sub.Shutdown {
+		events = append(events, "shutdown")
+	}
+	if sub.Tick {
+		events = append(events, "tick")
+	}
+	if sub.BarStateUpdate {
+		events = append(events, "bar_state_update")
+	}
+	if sub.Input {
+		events = append(events, "input")
+	}
+
+	jsonpayload, err := json.Marshal(events)
+	if err != nil {
+		return nil, fmt.Errorf("failed to json marshal event list: %w", err)
+	}
+
+	err = ipc.sendHeader(SUBSCRIBE, uint32(len(jsonpayload)))
+	if err != nil {
+		return nil, err
+	}
+
+	err = ipc.sendPayload(jsonpayload)
+	if err != nil {
+		return nil, err
+	}
+
+	payload, err := ipc.readResponse()
+	if err != nil {
+		responses := []*Response{}
+		if err := json.Unmarshal(payload.Payload, &responses); err != nil {
+			return nil, fmt.Errorf("failed to unmarshal json response: %w", err)
+		}
+
+		return responses, err
+	}
+
+	// register the subscribed events
+	ipc.Events = sub
+
+	return nil, nil
+}
+
+// Event loop: Once you have subscribed to an event, you need to enter
+// an event  loop over the  same running socket connection.  Sway will
+// send event payloads for every subscribed event whenever it happens.
+//
+// You  supply the  loop a  generic callback  function, which  will be
+// called every  time an event  occurs. The function will  receive the
+// swayipc.RawResponse object for the event.  You need to Unmarshall the
+// Payload field yourself.
+//
+// If your callback function returns  an error, the event loop returns
+// with this error and finishes thus.
+func (ipc *SwayIPC) EventLoop(callback func(event *RawResponse) error) error {
+	for {
+		payload, err := ipc.readResponse()
+		if err != nil {
+			return err
+		}
+
+		if err := callback(payload); err != nil {
+			return err
+		}
+	}
+}