[Core] Cleanup duplicate version callback code

deluge/ui/ui.py

@@ -10,14 +10,13 @@
 from __future__ import print_function
 
 import logging
-import os
-import platform
 import sys
 from optparse import OptionGroup, OptionParser
 
 import deluge.common
 import deluge.configmanager
 import deluge.log
+from deluge.main import version_callback
 
 try:
     from setproctitle import setproctitle
@@ -26,20 +25,6 @@ except ImportError:
         return
 
 
-def version_callback(option, opt_str, value, parser):
-    print(os.path.basename(sys.argv[0]) + ": " + deluge.common.get_version())
-    try:
-        from deluge._libtorrent import lt
-        print("libtorrent: %s" % lt.version)
-    except ImportError:
-        pass
-    print("Python: %s" % platform.python_version())
-    for version in (platform.linux_distribution(), platform.win32_ver(), platform.mac_ver(), ("n/a",)):
-        if filter(None, version):  # pylint: disable=bad-builtin
-            print("OS: %s %s" % (platform.system(), " ".join(version)))
-            break
-    raise SystemExit
-
 DEFAULT_PREFS = {
     "default_ui": "gtk"
 }