bin: Add screen_info command

* Provides basic information on attached BScreen's
* Only shows B_MAIN_SCREEN_ID at the moment as that's
  all we have available.

src/bin/Jamfile

@@ -117,6 +117,7 @@ StdBinCommands
 	hey.cpp
 	reindex.cpp
 	resattr.cpp
+	screen_info.cpp
 	setarch.cpp
 	setdecor.cpp
 	settype.cpp

src/bin/screen_info.cpp

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2013-2014 Haiku, Inc. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *		Alexander von Gluck IV <[email protected]>
+ */
+
+
+#include <Screen.h>
+#include <stdio.h>
+
+
+// screen_id currently locked to 1 screen
+// TODO: This should likely be provided by our API
+#define MAX_SCREENS 1
+
+
+int
+main()
+{
+	for (int id = 0; id < MAX_SCREENS; id++) {
+		screen_id screenIndex = {id};
+		BScreen screen(screenIndex);
+		accelerant_device_info info;
+
+		// At the moment, screen.ID() is always 0;
+		printf("Screen %d:", screen.ID());
+		if (screen.GetDeviceInfo(&info) != B_OK) {
+			printf(" unavailable\n");
+		} else {
+			printf(" attached\n");
+			printf("  version: %u\n", info.version);
+			printf("  name:    %s\n", info.name);
+			printf("  chipset: %s\n", info.chipset);
+			printf("  serial:  %s\n", info.serial_no);
+		}
+	}
+
+	return 0;
+}