Resolved command-line handling in the GTK+ backend by not doing it and documenting that we don't do it.

gtkcalls_unix.go

@@ -35,7 +35,7 @@ func gtk_init() error {
 	var err *C.GError = nil		// redundant in Go, but let's explicitly assign it anyway
 
 	// gtk_init_with_args() gives us error info (thanks chpe in irc.gimp.net/#gtk+)
-	// TODO allow GTK+ standard command-line argument processing?
+	// don't worry about GTK+'s command-line arguments; they're also available as environment variables (thanks mclasen in irc.gimp.net/#gtk+)
 	result := C.gtk_init_with_args(nil, nil, nil, nil, nil, &err)
 	if result == C.FALSE {
 		return fmt.Errorf("error actually initilaizing GTK+: %s", fromgstr(err.message))

init.go

@@ -10,6 +10,9 @@ package ui
 // It is not safe to call ui.Go() in a goroutine. It must be called directly from main().
 //
 // This model is undesirable, but Cocoa limitations require it.
+// 
+// Go does not process the command line for flags (that is, it does not call flag.Parse()), nor does package ui add any of the underlying toolkit's supported command-line flags.
+// If you must, and if the toolkit also has environment variable equivalents to these flags (for instance, GTK+), use those instead.
 func Go(main func()) error {
 	return ui(main)
 }