utils/cached_property: replace with the stdlib implementation

2 files changed, 1 insertions, 76 deletions

diff --git a/alot/completion/command.py b/alot/completion/command.py
index 72c82ea3..43ffcea2 100644
--- a/alot/completion/command.py
+++ b/alot/completion/command.py
@@ -2,12 +2,12 @@
 # This file is released under the GNU GPL, version 3 or a later revision.
 # For further details see the COPYING file
 
+from functools import cached_property
 import logging
 
 from alot import commands
 from alot.buffers import EnvelopeBuffer
 from alot.settings.const import settings
-from alot.utils.cached_property import cached_property
 from .completer import Completer
 from .commandname import CommandNameCompleter
 from .tag import TagCompleter
diff --git a/alot/utils/cached_property.py b/alot/utils/cached_property.py
deleted file mode 100644
index 3ad66413..00000000
--- a/alot/utils/cached_property.py
+++ /dev/null
@@ -1,75 +0,0 @@
-# verbatim from werkzeug.utils.cached_property
-#
-# Copyright (c) 2014 by the Werkzeug Team, see AUTHORS for more details.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-#       notice, this list of conditions and the following disclaimer.
-#
-#     * Redistributions in binary form must reproduce the above
-#       copyright notice, this list of conditions and the following
-#       disclaimer in the documentation and/or other materials provided
-#       with the distribution.
-#
-#     * The names of the contributors may not be used to endorse or
-#       promote products derived from this software without specific
-#       prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-
-_missing = object()
-
-
-class cached_property:
-    """A decorator that converts a function into a lazy property.  The
-    function wrapped is called the first time to retrieve the result
-    and then that calculated result is used the next time you access
-    the value::
-
-        class Foo:
-
-            @cached_property
-            def foo(self):
-                # calculate something important here
-                return 42
-
-    The class has to have a `__dict__` in order for this property to
-    work.
-    """
-
-    # implementation detail: this property is implemented as non-data
-    # descriptor.  non-data descriptors are only invoked if there is
-    # no entry with the same name in the instance's __dict__.
-    # this allows us to completely get rid of the access function call
-    # overhead.  If one choses to invoke __get__ by hand the property
-    # will still work as expected because the lookup logic is replicated
-    # in __get__ for manual invocation.
-
-    def __init__(self, func, name=None, doc=None):
-        self.__name__ = name or func.__name__
-        self.__module__ = func.__module__
-        self.__doc__ = doc or func.__doc__
-        self.func = func
-
-    def __get__(self, obj, type=None):
-        if obj is None:
-            return self
-        value = obj.__dict__.get(self.__name__, _missing)
-        if value is _missing:
-            value = self.func(obj)
-            obj.__dict__[self.__name__] = value
-        return value