cdrdao no-disc ejection & --eject (#93)

* cdrdao: eject empty disc while reading toc

- introduce EjectError
- move {eject,load,unmount}_device to program.utils

* remove duplicated eject

* remove unnecessary ejection

* add --eject option

morituri/command/main.py

@@ -12,6 +12,7 @@ from morituri.command import cd, offset, drive, image, accurip, debug
 from morituri.command.basecommand import BaseCommand
 from morituri.common import common, directory
 from morituri.extern.task import task
+from morituri.program.utils import eject_device
 
 import logging
 logger = logging.getLogger(__name__)
@@ -26,9 +27,13 @@ def main():
     )
     map(pkg_resources.working_set.add, distributions)
     try:
-        ret = Whipper(sys.argv[1:], os.path.basename(sys.argv[0]), None).do()
+        cmd = Whipper(sys.argv[1:], os.path.basename(sys.argv[0]), None)
+        ret = cmd.do()
     except SystemError, e:
-        sys.stderr.write('whipper: error: %s\n' % e.args)
+        sys.stderr.write('whipper: error: %s\n' % e)
+        if (type(e) is common.EjectError and
+                cmd.options.eject in ('failure', 'always')):
+            eject_device(e.device)
         return 255
     except ImportError, e:
         raise ImportError(e)
@@ -77,6 +82,10 @@ You can get help on subcommands by using the -h option to the subcommand.
         self.parser.add_argument('-h', '--help',
                             action="store_true", dest="help",
                             help="show this help message and exit")
+        self.parser.add_argument('-e', '--eject',
+                            action="store", dest="eject", default="always",
+                            choices=('never', 'failure', 'success', 'always'),
+                            help="when to eject disc (default: always)")
 
     def handle_arguments(self):
         if self.options.help: