commands/envelope: refactor deriving headers to be edited

Split the code into its own function.
Make it properly case-insensitive.
Apply either the blacklist or the whitelist setting, trying to apply
both makes no sense.
Enforce that either a blacklist or a whitelist is configured in the
settings.

1 files changed, 0 insertions, 29 deletions

diff --git a/alot/utils/collections.py b/alot/utils/collections.py
deleted file mode 100644
index acde56ce..00000000
--- a/alot/utils/collections.py
+++ /dev/null
@@ -1,29 +0,0 @@
-# This file is released under the GNU GPL, version 3 or a later revision.
-# For further details see the COPYING file
-
-from collections.abc import Set
-
-# for backward compatibility with Python <3.7
-from collections import OrderedDict
-
-
-class OrderedSet(Set):
-    """
-    Ordered collection of distinct hashable objects.
-    Taken from https://stackoverflow.com/a/10006674
-    """
-
-    def __init__(self, iterable=()):
-        self.d = OrderedDict.fromkeys(iterable)
-
-    def __len__(self):
-        return len(self.d)
-
-    def __contains__(self, element):
-        return element in self.d
-
-    def __iter__(self):
-        return iter(self.d)
-
-    def __repr__(self):
-        return str(list(self))