[core/theme] Add inline named color support

Add named colors that can be specified directly in the "colors" array
within a theme.

fixes #556

bumblebee/theme.py

@@ -186,9 +186,14 @@ class Theme(object):
                     result[key] = colors[field][key]
         return result
 
+    def color(self, color_name, default=None):
+        return self._colorset.get(color_name, default)
+
     def _load_colors(self, name):
         """Load colors for a theme"""
         try:
+            if isinstance(name, dict):
+                return name
             if name.lower() == "wal":
                 return self._load_wal_colors()
         except Exception as err:
@@ -285,7 +290,7 @@ class Theme(object):
 
         if isinstance(value, (dict, list)):
             return value
-        return self._colorset.get(value, value)
+        return self.color(value, value)
 
     # algorithm copied from
     # http://blog.impressiver.com/post/31434674390/deep-merge-multiple-python-dicts

themes/gruvbox-powerline.json

@@ -1,13 +1,19 @@
 {
 	"icons": [ "paxy97", "awesome-fonts" ],
+	"colors": [{
+		"fg0": "#fbf1c7",
+		"bg0_h": "#1d2021",
+		"yellow": "#d79921",
+		"red": "#cc241d"
+	}],
 	"defaults": {
 		"warning": {
-			"fg": "#1d2021",
-			"bg": "#d79921"
+			"fg": "bg0_h",
+			"bg": "yellow"
 		},
 		"critical": {
-			"fg": "#fbf1c7",
-			"bg": "#cc241d"
+			"fg": "fg0",
+			"bg": "red"
 		},
 		"default-separators": false,
 		"separator-block-width": 0