Starting a unicode_utils module.

--HG--
extra : source : 2e47fa11a272ed61f7c1bbf88aae27e81040fe93

setuptools/unicode_utils.py

+import unicodedata
+import sys
+from setuptools.compat import unicode as decoded_string
+
+
+# HFS Plus uses decomposed UTF-8
+def decompose(path):
+    if isinstance(path, decoded_string):
+        return unicodedata.normalize('NFD', path)
+    try:
+        path = path.decode('utf-8')
+        path = unicodedata.normalize('NFD', path)
+        path = path.encode('utf-8')
+    except UnicodeError:
+        pass  # Not UTF-8
+    return path
+
+
+def filesys_decode(path):
+    """
+    Ensure that the given path is decoded,
+    NONE when no expected encoding works
+    """
+
+    fs_enc = sys.getfilesystemencoding()
+    if isinstance(path, decoded_string):
+        return path
+
+    for enc in (fs_enc, "utf-8"):
+        try:
+            return path.decode(enc)
+        except UnicodeDecodeError:
+            continue
+
+
+def try_encode(string, enc):
+    "turn unicode encoding into a functional routine"
+    try:
+        return string.encode(enc)
+    except UnicodeEncodeError:
+        return None