Move mac/win to subpackages & fix #64

- Move macOS and Windows implementations to sub packagese to improve organization
- Fix #64 in legacy windows implementation by mapping results to standard error codes

send2trash/win/IFileOperationProgressSink.py

@@ -0,0 +1,46 @@
+# Sample implementation of IFileOperationProgressSink that just prints
+# some basic info
+
+import pythoncom
+from win32com.shell import shell, shellcon
+from win32com.server.policy import DesignatedWrapPolicy
+
+
+class FileOperationProgressSink(DesignatedWrapPolicy):
+    _com_interfaces_ = [shell.IID_IFileOperationProgressSink]
+    _public_methods_ = [
+        "StartOperations",
+        "FinishOperations",
+        "PreRenameItem",
+        "PostRenameItem",
+        "PreMoveItem",
+        "PostMoveItem",
+        "PreCopyItem",
+        "PostCopyItem",
+        "PreDeleteItem",
+        "PostDeleteItem",
+        "PreNewItem",
+        "PostNewItem",
+        "UpdateProgress",
+        "ResetTimer",
+        "PauseTimer",
+        "ResumeTimer",
+    ]
+
+    def __init__(self):
+        self._wrap_(self)
+        self.newItem = None
+
+    def PreDeleteItem(self, flags, item):
+        # Can detect cases where to stop via flags and condition below, however the operation
+        # does not actual stop, we can resort to raising an exception as that does stop things
+        # but that may need some additional considerations before implementing.
+        return 0 if flags & shellcon.TSF_DELETE_RECYCLE_IF_POSSIBLE else 0x80004005  # S_OK, or E_FAIL
+
+    def PostDeleteItem(self, flags, item, hr_delete, newly_created):
+        if newly_created:
+            self.newItem = newly_created.GetDisplayName(shellcon.SHGDN_FORPARSING)
+
+
+def create_sink():
+    return pythoncom.WrapObject(FileOperationProgressSink(), shell.IID_IFileOperationProgressSink)