Add Hyprpaper backend

backend.go

@@ -6,6 +6,7 @@ package wallutils
 // WMs contains all available backends for changing the wallpaper
 // Some backends may require cgo (sway + x11)
 var WMs = []WM{
+	&Hyprpaper{},
 	&Sway{},
 	&Deepin{},
 	&Xfce4{},

backend_nocgo.go

@@ -6,6 +6,7 @@ package wallutils
 // WMs contains all available backends for changing the wallpaper
 // Only backends that do not require cgo should be included here.
 var WMs = []WM{
+	&Hyprpaper{},
 	//&Sway{},
 	&Deepin{},
 	&Xfce4{},

hyprpaper.go

@@ -0,0 +1,114 @@
+package wallutils
+
+import (
+	"fmt"
+	"net"
+	"path"
+
+	"github.com/xyproto/env/v2"
+)
+
+// Hyprpaper compatible windowmanager
+type Hyprpaper struct {
+	mode    string
+	verbose bool
+	sock    string
+}
+
+// Name returns the name of this window manager or desktop environment
+func (sb *Hyprpaper) Name() string {
+	return "Hyprpaper"
+}
+
+// ExecutablesExists checks if executables associated with this backend exists in the PATH
+func (sb *Hyprpaper) ExecutablesExists() bool {
+	return which("hyprpaper") != ""
+}
+
+// Running examines environment variables to try to figure out if this backend is currently running
+func (sb *Hyprpaper) Running() bool {
+	inst := env.Str("HYPRLAND_INSTANCE_SIGNATURE")
+	sb.sock = path.Join("/tmp/hypr", inst, ".hyprpaper.sock")
+	return exists(sb.sock)
+}
+
+// SetMode will set the current way to display the wallpaper (stretched, tiled etc)
+func (sb *Hyprpaper) SetMode(mode string) {
+	sb.mode = mode
+}
+
+// SetVerbose can be used for setting the verbose field to true or false.
+// This will cause this backend to output information about what is is doing on stdout.
+func (sb *Hyprpaper) SetVerbose(verbose bool) {
+	sb.verbose = verbose
+}
+
+// SetWallpaper sets the desktop wallpaper, given an image filename.
+// The image must exist and be readable.
+func (sb *Hyprpaper) SetWallpaper(imageFilename string) error {
+	if !exists(imageFilename) {
+		return fmt.Errorf("no such file: %s", imageFilename)
+	}
+
+	// Connect to the Hyprpaper socket
+	sock, err := net.DialUnix("unix", nil, &net.UnixAddr{Name: sb.sock, Net: "unix"})
+
+	if err != nil {
+		return err
+	}
+
+	defer sock.Close()
+
+	// Preload the image
+	if err = runHyprCmd(sock, "preload "+imageFilename); err != nil {
+		return err
+	}
+
+	// Set the wallpaper mode
+	mode := defaultMode
+	if sb.mode != "" {
+		mode = sb.mode
+	}
+
+	switch mode {
+	case "center", "tile", "fill", "stretch", "scale", "scaled", "zoom", "zoomed", "stretched":
+		mode = ""
+	case "fit":
+		mode = "contain:"
+	default:
+		// Invalid and unrecognized desktop wallpaper mode
+		return fmt.Errorf("invalid desktop wallpaper mode for swaybg: %s", mode)
+	}
+
+	// Set the wallpaper
+	if err = runHyprCmd(sock, "wallpaper ,"+mode+imageFilename); err != nil {
+		return err
+	}
+
+	// Unload unused images
+	return runHyprCmd(sock, "unload unused")
+}
+
+func runHyprCmd(sock *net.UnixConn, cmd string) error {
+	_, err := sock.Write([]byte(cmd))
+
+	if err != nil {
+		return err
+	}
+
+	buf := [32]byte{}
+
+	n, err := sock.Read(buf[:])
+
+	if err != nil {
+		return err
+	}
+
+	res := string(buf[:n])
+
+	if res != "ok" {
+		return fmt.Errorf("cmd %q failed: %s", cmd, res)
+	}
+
+	return nil
+}