Preserve ToC file generated by cdrdao

Whipper uses cdrdao during its ripping process. With this commit it will now store cdrdao's generated tocfile in the ripping path.
Preserving the tocfile allows users to easily burn ripped discs having a non-compliant cue sheet.

Fixes #214.

whipper/program/cdrdao.py

@@ -1,9 +1,10 @@
 import os
 import re
+import shutil
 import tempfile
 from subprocess import Popen, PIPE
 
-from whipper.common.common import EjectError
+from whipper.common.common import EjectError, truncate_filename
 from whipper.image.toc import TocFile
 
 import logging
@@ -12,7 +13,7 @@ logger = logging.getLogger(__name__)
 CDRDAO = 'cdrdao'
 
 
-def read_toc(device, fast_toc=False):
+def read_toc(device, fast_toc=False, toc_path=None):
     """
     Return cdrdao-generated table of contents for 'device'.
     """
@@ -43,6 +44,14 @@ def read_toc(device, fast_toc=False):
 
     toc = TocFile(tocfile)
     toc.parse()
+    if toc_path is not None:
+        t_comp = os.path.abspath(toc_path).split(os.sep)
+        t_dirn = os.sep.join(t_comp[:-1])
+        # If the output path doesn't exist, make it recursively
+        if not os.path.isdir(t_dirn):
+            os.makedirs(t_dirn)
+        t_dst = truncate_filename(os.path.join(t_dirn, t_comp[-1] + '.toc'))
+        shutil.copy(tocfile, os.path.join(t_dirn, t_dst))
     os.unlink(tocfile)
     return toc
 
@@ -86,11 +95,11 @@ def ReadTOCTask(device):
     return read_toc(device, fast_toc=True)
 
 
-def ReadTableTask(device):
+def ReadTableTask(device, toc_path=None):
     """
     stopgap morituri-insanity compatibility layer
     """
-    return read_toc(device)
+    return read_toc(device, toc_path=toc_path)
 
 
 def getCDRDAOVersion():