support output assignment on Hyprland

main.go

@@ -31,6 +31,7 @@ var (
 	id2entry         map[string]desktopEntry
 	preferredApps    map[string]interface{}
 	exclusions       []string
+	hyprlandMonitors []monitor
 )
 
 var categoryNames = [...]string{
@@ -66,6 +67,30 @@ type desktopEntry struct {
 	NoDisplay  bool
 }
 
+type monitor struct {
+	Id              int     `json:"id"`
+	Name            string  `json:"name"`
+	Description     string  `json:"description"`
+	Make            string  `json:"make"`
+	Model           string  `json:"model"`
+	Serial          string  `json:"serial"`
+	Width           int     `json:"width"`
+	Height          int     `json:"height"`
+	RefreshRate     float64 `json:"refreshRate"`
+	X               int     `json:"x"`
+	Y               int     `json:"y"`
+	ActiveWorkspace struct {
+		Id   int    `json:"id"`
+		Name string `json:"name"`
+	} `json:"activeWorkspace"`
+	Reserved   []int   `json:"reserved"`
+	Scale      float64 `json:"scale"`
+	Transform  int     `json:"transform"`
+	Focused    bool    `json:"focused"`
+	DpmsStatus bool    `json:"dpmsStatus"`
+	Vrr        bool    `json:"vrr"`
+}
+
 // slices below will hold DesktopID strings
 var (
 	listUtility            []string
@@ -372,6 +397,7 @@ func main() {
 		if *targetOutput != "" {
 			// We want to assign layershell to a monitor, but we only know the output name!
 			output2mon, err = mapOutputs()
+			fmt.Println(">>>", output2mon)
 			if err == nil {
 				monitor := output2mon[*targetOutput]
 				layershell.SetMonitor(win, monitor)

tools.go

@@ -5,8 +5,11 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"github.com/joshuarubin/go-sway"
+	log "github.com/sirupsen/logrus"
 	"io"
 	"io/fs"
+	"net"
 	"os"
 	"os/exec"
 	"path"
@@ -17,11 +20,8 @@ import (
 	"syscall"
 	"time"
 
-	log "github.com/sirupsen/logrus"
-
 	"github.com/gotk3/gotk3/gdk"
 	"github.com/gotk3/gotk3/gtk"
-	"github.com/joshuarubin/go-sway"
 )
 
 func wayland() bool {
@@ -651,6 +651,31 @@ func open(filePath string, xdgOpen bool) {
 func mapOutputs() (map[string]*gdk.Monitor, error) {
 	result := make(map[string]*gdk.Monitor)
 
+	if os.Getenv("HYPRLAND_INSTANCE_SIGNATURE") != "" {
+		err := listHyprlandMonitors()
+		if err == nil {
+
+			display, err := gdk.DisplayGetDefault()
+			if err != nil {
+				return nil, err
+			}
+
+			num := display.GetNMonitors()
+			for i := 0; i < num; i++ {
+				mon, _ := display.GetMonitor(i)
+				geometry := mon.GetGeometry()
+				// assign output to monitor on the basis of the same x, y coordinates
+				for _, output := range hyprlandMonitors {
+					if int(output.X) == geometry.GetX() && int(output.Y) == geometry.GetY() {
+						result[output.Name] = mon
+					}
+				}
+			}
+		} else {
+			return nil, err
+		}
+
+	} else if os.Getenv("SWAYSOCK") != "" {
 		ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
 		defer cancel()
 
@@ -680,6 +705,10 @@ func mapOutputs() (map[string]*gdk.Monitor, error) {
 				}
 			}
 		}
+	} else {
+		return nil, errors.New("output assignment only supported on sway and Hyprland")
+	}
+
 	return result, nil
 }
 
@@ -698,3 +727,38 @@ func substring(s string, start int, end int) string {
 	}
 	return s[startStrIdx:]
 }
+
+func hyprctl(cmd string) ([]byte, error) {
+	his := os.Getenv("HYPRLAND_INSTANCE_SIGNATURE")
+	socketFile := fmt.Sprintf("/tmp/hypr/%s/.socket.sock", his)
+	conn, err := net.Dial("unix", socketFile)
+	if err != nil {
+		return nil, err
+	}
+
+	message := []byte(cmd)
+	_, err = conn.Write(message)
+	if err != nil {
+		return nil, err
+	}
+
+	reply := make([]byte, 102400)
+	n, err := conn.Read(reply)
+	if err != nil {
+		return nil, err
+	}
+
+	defer conn.Close()
+
+	return reply[:n], nil
+}
+
+func listHyprlandMonitors() error {
+	reply, err := hyprctl("j/monitors")
+	if err != nil {
+		return err
+	} else {
+		err = json.Unmarshal([]byte(reply), &hyprlandMonitors)
+	}
+	return err
+}