add -ft argument

main.go

@@ -127,6 +127,7 @@ var marginLeft = flag.Int("ml", 0, "Margin Left")
 var marginRight = flag.Int("mr", 0, "Margin Right")
 var marginBottom = flag.Int("mb", 0, "Margin Bottom")
 var fsColumns = flag.Uint("fscol", 2, "File Search result COLumns")
+var forceTheme = flag.Bool("ft", false, "add GTK_THEME=<default-gtk-theme> env var for libadwaita apps; requires gtk4-compatible theme")
 var columnsNumber = flag.Uint("c", 6, "number of Columns")
 var itemSpacing = flag.Uint("spacing", 20, "icon spacing")
 var lang = flag.String("lang", "", "force lang, e.g. \"en\", \"pl\"")

tools.go

@@ -548,6 +548,15 @@ func savePinned() {
 }
 
 func launch(command string, terminal bool) {
+	themeToPrepend := ""
+	// add "GTK_THEME=<default_gtk_theme>" environment variable
+	if *forceTheme {
+		settings, _ := gtk.SettingsGetDefault()
+		th, err := settings.GetProperty("gtk-theme-name")
+		if err == nil {
+			themeToPrepend = th.(string)
+		}
+	}
 	// trim % and everything afterwards
 	if strings.Contains(command, "%") {
 		cutAt := strings.Index(command, "%")
@@ -577,6 +586,10 @@ func launch(command string, terminal bool) {
 		cmdIdx = 0
 	}
 
+	if themeToPrepend != "" {
+		envVars = append(envVars, fmt.Sprintf("GTK_THEME=%s", themeToPrepend))
+	}
+
 	cmd := exec.Command(elements[cmdIdx], elements[1+cmdIdx:]...)
 
 	if terminal {