Moved color code into it's own class that other classes can inherit

from.

i3pystatus/core/color.py

@@ -0,0 +1,56 @@
+from colour import Color
+
+
+class ColorRangeModule(object):
+
+    start_color = "#00FF00"
+    end_color = 'red'
+
+    @staticmethod
+    def get_hex_color_range(start_color, end_color, quantity):
+        """
+        Generates a list of quantity Hex colors from start_color to end_color.
+
+        :param start_color: Hex or plain English color for start of range
+        :param end_color: Hex or plain English color for end of range
+        :param quantity: Number of colours to return
+        :return: A list of Hex color values
+        """
+        raw_colors = [c.hex for c in list(Color(start_color).range_to(Color(end_color), quantity))]
+        colors = []
+        for color in raw_colors:
+
+            # i3bar expects the full Hex value but for some colors the colour
+            # module only returns partial values. So we need to convert these colors to the full
+            # Hex value.
+            if len(color) == 4:
+                fixed_color = "#"
+                for c in color[1:]:
+                    fixed_color += c * 2
+                colors.append(fixed_color)
+            else:
+                colors.append(color)
+        return colors
+
+    def get_gradient(self, value, colors, upper_limit=100):
+        """
+        Map a value to a color
+        :param value: Some value
+        :return: A Hex color code
+        """
+        index = int(self.percentage(value, upper_limit))
+        if index >= len(colors):
+            return colors[-1]
+        elif index < 0:
+            return colors[0]
+        else:
+            return colors[index]
+
+    @staticmethod
+    def percentage(part, whole):
+        """
+        Calculate percentage
+        """
+        if whole == 0:
+            return 0
+        return 100 * float(part) / float(whole)