Add same-codebase support for python 2.7.

When I opted for two codebases for python2/python3,
Send2Trash used C modules and it was easier to just have two
packages. With the ctypes version, supporting both python
versions becomes trivial and it's much more convenient to
merge them back into a single codebase.

I've only tested this code on Linux. I've converted plat_osx and
plat_win, but they only work theoretically.

send2trash/__init__.py

@@ -1,4 +1,4 @@
-# Copyright 2010 Hardcoded Software (http://www.hardcoded.net)
+# Copyright 2013 Hardcoded Software (http://www.hardcoded.net)
 
 # This software is licensed under the "BSD" License as described in the "LICENSE" file, 
 # which should be included with this package. The terms are also available at 

send2trash/compat.py

@@ -0,0 +1,13 @@
+# Copyright 2013 Hardcoded Software (http://www.hardcoded.net)
+
+# This software is licensed under the "BSD" License as described in the "LICENSE" file, 
+# which should be included with this package. The terms are also available at 
+# http://www.hardcoded.net/licenses/bsd_license
+
+import sys
+if sys.version < '3':
+    text_type = unicode
+    binary_type = str
+else:
+    text_type = str
+    binary_type = bytes

send2trash/plat_osx.py

@@ -1,12 +1,16 @@
-# Copyright 2010 Hardcoded Software (http://www.hardcoded.net)
+# Copyright 2013 Hardcoded Software (http://www.hardcoded.net)
 
 # This software is licensed under the "BSD" License as described in the "LICENSE" file, 
 # which should be included with this package. The terms are also available at 
 # http://www.hardcoded.net/licenses/bsd_license
 
+from __future__ import unicode_literals
+
 from ctypes import cdll, byref, Structure, c_char, c_char_p
 from ctypes.util import find_library
 
+from .compat import binary_type
+
 Foundation = cdll.LoadLibrary(find_library('Foundation'))
 CoreServices = cdll.LoadLibrary(find_library('CoreServices'))
 
@@ -33,7 +37,7 @@ def check_op_result(op_result):
         raise OSError(msg)
 
 def send2trash(path):
-    if not isinstance(path, bytes):
+    if not isinstance(path, binary_type):
         path = path.encode('utf-8')
     fp = FSRef()
     opts = kFSPathMakeRefDoNotFollowLeafSymlink

send2trash/plat_other.py

@@ -1,4 +1,4 @@
-# Copyright 2010 Hardcoded Software (http://www.hardcoded.net)
+# Copyright 2013 Hardcoded Software (http://www.hardcoded.net)
 
 # This software is licensed under the "BSD" License as described in the "LICENSE" file, 
 # which should be included with this package. The terms are also available at 
@@ -14,12 +14,18 @@
 # For external volumes this implementation will raise an exception if it can't
 # find or create the user's trash directory.
 
+from __future__ import unicode_literals
+
 import sys
 import os
 import os.path as op
 from datetime import datetime
 import stat
-from urllib.parse import quote
+try:
+    from urllib.parse import quote
+except ImportError:
+    # Python 2
+    from urllib import quote
 
 FILES_DIR = 'files'
 INFO_DIR = 'info'

send2trash/plat_win.py

@@ -1,13 +1,17 @@
-# Copyright 2010 Hardcoded Software (http://www.hardcoded.net)
+# Copyright 2013 Hardcoded Software (http://www.hardcoded.net)
 
 # This software is licensed under the "BSD" License as described in the "LICENSE" file, 
 # which should be included with this package. The terms are also available at 
 # http://www.hardcoded.net/licenses/bsd_license
 
+from __future__ import unicode_literals
+
 from ctypes import windll, Structure, byref, c_uint
 from ctypes.wintypes import HWND, UINT, LPCWSTR, BOOL
 import os.path as op
 
+from .compat import text_type
+
 shell32 = windll.shell32
 SHFileOperationW = shell32.SHFileOperationW
 
@@ -35,8 +39,8 @@ FOF_ALLOWUNDO = 64
 FOF_NOERRORUI = 1024
 
 def send2trash(path):
-    if not isinstance(path, str):
-        path = str(path, 'mbcs')
+    if not isinstance(path, text_type):
+        path = text_type(path, 'mbcs')
     if not op.isabs(path):
         path = op.abspath(path)
     fileop = SHFILEOPSTRUCTW()