colorscheme: Make use an abstract method

The `use` method has always been decorated as being a `@staticmethod`.
Many colorschemes use fields to store certain properties, these then
need to be accessed using `self`. This isn't possible with a static
method so they override it with a regular method. This is fine as far as
Python is concerned but PyLint doesn't like the `self` parameters adding
an argument to the method.

All colorschemes should actually implement the `use` method anyway so
making it an `@abstractmethod` seems appropriate and allows us to
include the `self` argument.

1 files changed, 3 insertions, 2 deletions

diff --git a/ranger/gui/colorscheme.py b/ranger/gui/colorscheme.py
index 859773fb..22ff053f 100644
--- a/ranger/gui/colorscheme.py
+++ b/ranger/gui/colorscheme.py
@@ -27,6 +27,7 @@ set colorscheme yourschemename
 from __future__ import (absolute_import, division, print_function)
 
 import os.path
+from abc import abstractmethod
 from curses import color_pair
 from io import open
 
@@ -72,8 +73,8 @@ class ColorScheme(object):
         fg, bg, attr = self.get(*flatten(keys))
         return attr | color_pair(get_color(fg, bg))
 
-    @staticmethod
-    def use(_):
+    @abstractmethod
+    def use(self, context):
         """Use the colorscheme to determine the (fg, bg, attr) tuple.
 
         Override this method in your own colorscheme.