Add 24-bit color support for shell renderers

Refs #81.

powerline/renderer.py

@@ -9,6 +9,8 @@ class Renderer(object):
 	ATTR_ITALIC = 2
 	ATTR_UNDERLINE = 4
 
+	TERM_24BIT = False
+
 	def __init__(self, theme_config, local_themes, theme_kwargs):
 		self.theme = Theme(theme_config=theme_config, **theme_kwargs)
 		self.local_themes = local_themes
@@ -138,5 +140,12 @@ class Renderer(object):
 		'''
 		return len(''.join([segment['rendered_raw'] for segment in segments]))
 
+	@staticmethod
+	def _int_to_rgb(int):
+		r = (int >> 16) & 0xff
+		g = (int >> 8) & 0xff
+		b = int & 0xff
+		return r, g, b
+
 	def hl(self, fg=None, bg=None, attr=None):
 		raise NotImplementedError

powerline/renderers/shell.py

@@ -17,12 +17,18 @@ class ShellRenderer(Renderer):
 			if fg is False or fg[0] is False:
 				ansi += [39]
 			else:
-				ansi += [38, 5, fg[0]]
+				if self.TERM_24BIT:
+					ansi += [38, 2] + list(self._int_to_rgb(fg[1]))
+				else:
+					ansi += [38, 5, fg[0]]
 		if bg is not None:
 			if bg is False or bg[0] is False:
 				ansi += [49]
 			else:
-				ansi += [48, 5, bg[0]]
+				if self.TERM_24BIT:
+					ansi += [48, 2] + list(self._int_to_rgb(bg[1]))
+				else:
+					ansi += [48, 5, bg[0]]
 		if attr is not None:
 			if attr is False:
 				ansi += [22]