makefiles/color: Add color functions.

c_xxxx functions can be used to wrap a piece of text in a
$(COLOR_X)...$(COLOR_RESET) block, thereby avoiding the easy mistake
of forgetting to place a COLOR_RESET.

Author: jcarrano

makefiles/color.inc.mk

@@ -27,3 +27,11 @@ ifneq ($(CC_NOCOLOR),1)
     endif
   endif
 endif
+
+# Colorizer functions:
+#  These functions wrap a block of text in $(COLOR_X)...$(COLOR_RESET).
+#  Do not nest calls to this functions or the colors will be wrong.
+c_green = $(COLOR_GREEN)$(1)$(COLOR_RESET)
+c_red = $(COLOR_RED)$(1)$(COLOR_RESET)
+c_yellow = $(COLOR_YELLOW)$(1)$(COLOR_RESET)
+c_purple = $(COLOR_PURPLE)$(1)$(COLOR_RESET)