Magic Folder.

[tahoe-lafs/tahoe-lafs.git] / src / allmydata / magicpath.py

diff --git a/src/allmydata/magicpath.py b/src/allmydata/magicpath.py
new file mode 100644 (file)
index 0000000..53e669b
--- /dev/null
+++ b/src/allmydata/magicpath.py
@@ -0,0 +1,33 @@
+
+import re
+import os.path
+
+from allmydata.util.assertutil import precondition, _assert
+
+def path2magic(path):
+    return re.sub(ur'[/@]',  lambda m: {u'/': u'@_', u'@': u'@@'}[m.group(0)], path)
+
+def magic2path(path):
+    return re.sub(ur'@[_@]', lambda m: {u'@_': u'/', u'@@': u'@'}[m.group(0)], path)
+
+
+IGNORE_SUFFIXES = [u'.backup', u'.tmp', u'.conflicted']
+IGNORE_PREFIXES = [u'.']
+
+def should_ignore_file(path_u):
+    precondition(isinstance(path_u, unicode), path_u=path_u)
+
+    for suffix in IGNORE_SUFFIXES:
+        if path_u.endswith(suffix):
+            return True
+
+    while path_u != u"":
+        oldpath_u = path_u
+        path_u, tail_u = os.path.split(path_u)
+        if tail_u.startswith(u"."):
+            return True
+        if path_u == oldpath_u:
+            return True  # the path was absolute
+        _assert(len(path_u) < len(oldpath_u), path_u=path_u, oldpath_u=oldpath_u)
+
+    return False